[PATCH] hg revert

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

[PATCH] hg revert

From: Bryan O'Sullivan <[e-mail]>

Add revert command.

manifest hash: 0094e6bf421f34bd0492a33f95400b1b095a6bdc
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doc/hg.1.txt

@@ -1,506 +1,524 b''
 HG(1)
 =====
 Matt Mackall <[e-mail]>
 
 NAME
 ----
 hg - Mercurial source code management system
 
 SYNOPSIS
 --------
 'hg' [-v -d -q -y] <command> [command options] [files]
 
 DESCRIPTION
 -----------
 The hg(1) command provides a command line interface to the Mercurial system.
 
 OPTIONS
 -------
 
 --debug, -d::
     enable debugging output
 
 --quiet, -q::
     suppress output
 
 --verbose, -v::
     enable additional output
 
 --noninteractive, -y::
     do not prompt, assume 'yes' for any required answers
 
 COMMAND ELEMENTS
 ----------------
 
 files ...::
     indicates one or more filename or relative path filenames
 
 path::
     indicates a path on the local machine
 
 revision::
     indicates a changeset which can be specified as a changeset revision
     number, a tag, or a unique substring of the changeset hash value
 
 repository path::
     either the pathname of a local repository or the URI of a remote
     repository.  There are two available URI protocols, http:// which is
     fast and the old-http:// protocol which is much slower but does not
     require a special server on the web host.
 
 COMMANDS
 --------
 
 add [files ...]::
     Schedule files to be version controlled and added to the repository.
     
     The files will be added to the repository at the next commit.
 
 addremove::
     Add all new files and remove all missing files from the repository.
     
     New files are ignored if they match any of the patterns in .hgignore. As
     with add, these changes take effect at the next commit.
 
 annotate [-r <rev> -u -n -c] [files ...]::
     List changes in files, showing the revision id responsible for each line
     
     This command is useful to discover who did a change or when a change took
     place.
     
     options:
     -r, --revision <rev>  annotate the specified revision
     -u, --user            list the author
     -c, --changeset       list the changeset
     -n, --number          list the revision number (default)
 
 cat <file> [revision]::
     Output to stdout the given revision for the specified file.
 
     If no revision is given then the tip is used.
 
 clone [-U] <source> [dest]::
     Create a copy of an existing repository in a new directory.
 
     If no destination directory name is specified, it defaults to the
     basename of the source.
 
     The source is added to the new repository's .hg/hgrc file to be used in
     future pulls.
 
     For efficiency, hardlinks are used for cloning whenever the
     source and destination are on the same filesystem.
 
     options:
     -U, --noupdate   do not update the new working directory
 
 commit [-A -t -l <file> -t <text> -u <user> -d <datecode>] [files...]::
     Commit changes to the given files into the repository.
     
     If a list of files is omitted, all changes reported by "hg status"
     will be commited.
     
     The HGEDITOR or EDITOR environment variables are used to start an
     editor to add a commit comment.
 
     Options:
 
     -A, --addremove       run addremove during commit
     -t, --text <text>     use <text> as commit message
     -l, --logfile <file>  show the commit message for the given file
     -d, --date <datecode> record datecode as commit date
     -u, --user <user>     record user as commiter
 
     aliases: ci
 
 copy <source> <dest>::
     Mark <dest> file as a copy or rename of a <source> one
     
     This command takes effect for the next commit.
 
 diff [-r revision] [-r revision] [files ...]::
     Show differences between revisions for the specified files.
     
     Differences between files are shown using the unified diff format.
     
     When two revision arguments are given, then changes are shown
     between those revisions. If only one revision is specified then
     that revision is compared to the working directory, and, when no
     revisions are specified, the working directory files are compared
     to its parent.
 
 export [-o filespec] [revision] ...::
     Print the changeset header and diffs for one or more revisions.
 
     The information shown in the changeset header is: author,
     changeset hash, parent and commit comment.
 
     Output may be to a file, in which case the name of the file is
     given using a format string.  The formatting rules are as follows:
 
     %%   literal "%" character
     %H   changeset hash (40 bytes of hexadecimal)
     %N   number of patches being generated
     %R   changeset revision number
     %b   basename of the exporting repository
     %h   short-form changeset hash (12 bytes of hexadecimal)
     %n   zero-padded sequence number, starting at 1
     %r   zero-padded changeset revision number
 
     Options:
 
     -o, --output <filespec>   print output to file with formatted named
 
 forget [files]::
     Undo an 'hg add' scheduled for the next commit.
 
 heads::
     Show all repository head changesets.
     
     Repository "heads" are changesets that don't have children
     changesets. They are where development generally takes place and
     are the usual targets for update and merge operations.
 
 identify::
     Print a short summary of the current state of the repo.
     
     This summary identifies the repository state using one or two parent
     hash identifiers, followed by a "+" if there are uncommitted changes
     in the working directory, followed by a list of tags for this revision.
 
     aliases: id
 
 import [-p <n> -b <base> -q] <patches>::
     Import a list of patches and commit them individually.
 
     options:
     -p, --strip <n>   directory strip option for patch. This has the same
                       meaning as the correnponding patch option
     -b <path>         base directory to read patches from
 
     aliases: patch
 
 init::
     Initialize a new repository in the current directory.
 
 log [-r revision ...] [file]::
     Print the revision history of the specified file or the entire project.
 
     By default this command outputs: changeset id and hash, tags,
     parents, user, date and time, and a summary for each commit. The
     -v switch adds some more detail, such as changed files, manifest
     hashes or message signatures.
 
     When a revision argument is given, only this file or changelog revision
     is displayed. With two revision arguments all revisions in this range
     are listed. Additional revision arguments may be given repeating the above
     cycle.
 
     aliases: history
 
 manifest [revision]::
     Print a list of version controlled files for the given revision.
 
     The manifest is the list of files being version controlled. If no revision
     is given then the tip is used.
 
 parents::
     Print the working directory's parent revisions.
 
 pull <repository path>::
     Pull changes from a remote repository to a local one.
 
     This finds all changes from the repository at the specified path
     or URL and adds them to the local repository. By default, this
     does not update the copy of the project in the working directory.
 
     options:
     -u, --update   update the working directory to tip after pull
 
 push <destination>::
     Push changes from the local repository to the given destination.
     
     This is the symmetrical operation for pull. It helps to move
     changes from the current repository to a different one. If the
     destination is local this is identical to a pull in that directory
     from the current one.
 
     The other currently available push method is SSH. This requires an
     accessible shell account on the destination machine and a copy of
     hg in the remote path. Destinations are specified in the following
     form:
 
       ssh://[user@]host[:port]/path
 
 rawcommit [-p -d -u -F -t -l]::
     Lowlevel commit, for use in helper scripts.
     
     This command is not intended to be used by normal users, as it is
     primarily useful for importing from other SCMs.
 
 recover::
     Recover from an interrupted commit or pull.
     
     This command tries to fix the repository status after an interrupted
     operation. It should only be necessary when Mercurial suggests it.
 
 remove [files ...]::
     Schedule the indicated files for removal from the repository.
     
     This command shedules the files to be removed at the next commit.
     This only removes files from the current branch, not from the
     entire project history.
 
     aliases: rm
 
+revert [names ...]::
+    Revert any uncommitted modifications made to the named files or
+    directories.  This restores the contents of the affected files to
+    an unmodified state.
+
+    If a file has been deleted, it is recreated.  If the executable
+    mode of a file was changed, it is reset.
+
+    If a directory is given, all files in that directory and its
+    subdirectories are reverted.
+
+    If no arguments are given, all files in the current directory and
+    its subdirectories are reverted.
+
+    options:
+    -r, --rev <rev>       revision to revert to
+    -n, --nonrecursive    do not recurse into subdirectories
+
 root::
     Print the root directory of the current repository.
 
 serve [-a addr -n name -p port -t templatedir]::
     Start a local HTTP repository browser and pull server.
 
     options:
     -a, --address <addr> address to use
     -p, --port <n>       port to use (default: 8000)
     -n, --name <name>    name to show in web pages (default: working dir)
     -t, --templatedir <path> web templates to use
 
 status::
     Show changed files in the working directory.
 
     The codes used to show the status of files are:
     
     C = changed
     A = added
     R = removed
     ? = not tracked
 
 tag [-t <text> -d <datecode> -u <user>] <name> [revision]::
     Name a particular revision using <name>.
     
     Tags are used to name particular revisions of the repository and are
     very useful to compare different revision, to go back to significant
     earlier versions or to mark branch points as releases, etc.
     
     If no revision is given, the tip is used.
 
     To facilitate version control, distribution, and merging of tags,
     they are stored as a file named ".hgtags" which is managed
     similarly to other project files and can be hand-edited if
     necessary.
 
     options:
     -t, --text <text>     message for tag commit log entry
     -d, --date <datecode> datecode for commit
     -u, --user <user>     user for commit
 
     Note: Mercurial also has support for "local tags" that are not
     version-controlled or distributed which are stored in the .hg/hgrc
     file.
 
 tags::
     List the repository tags.
 
     This lists both regular and local tags.
 
 tip::
     Show the tip revision.
 
 undo::
     Undo the last commit or pull transaction.
 
 update [-m -C] [revision]::
     Update the working directory to the specified revision.
 
     By default, update will refuse to run if doing so would require
     merging or discarding local changes.
 
     With the -m option, a merge will be performed.
 
     With the -C option, local changes will be lost.
     
     options:
     -m, --merge       allow merging of branches
     -C, --clean       overwrite locally modified files
 
     aliases: up checkout co
 
 verify::
     Verify the integrity of the current repository.
 
     This will perform an extensive check of the repository's
     integrity, validating the hashes and checksums of each entry in
     the changelog, manifest, and tracked files, as well as the
     integrity of their crosslinks and indices.
 
 SPECIFYING SINGLE REVISIONS
 ---------------------------
 
     Mercurial accepts several notations for identifying individual
     revisions.
 
     A plain integer is treated as a revision number.  Negative
     integers are treated as offsets from the tip, with -1 denoting the
     tip.
 
     A 40-digit hexadecimal string is treated as a unique revision
     identifier.
 
     A hexadecimal string less than 40 characters long is treated as a
     unique revision identifier, and referred to as a short-form
     identifier.  A short-form identifier is only valid if it is the
     prefix of one full-length identifier.
 
     Any other string is treated as a tag name, which is a symbolic
     name associated with a revision identifier.  Tag names may not
     contain the ":" character.
 
     The reserved name "tip" is a special tag that always identifies
     the most recent revision.
 
 SPECIFYING MULTIPLE REVISIONS
 -----------------------------
 
     When Mercurial accepts more than one revision, they may be
     specified individually, or provided as a continuous range,
     separated by the ":" character.
 
     The syntax of range notation is [BEGIN]:[END], where BEGIN and END
     are revision identifiers.  Both BEGIN and END are optional.  If
     BEGIN is not specified, it defaults to revision number 0.  If END
     is not specified, it defaults to the tip.  The range ":" thus
     means "all revisions".
 
     If BEGIN is greater than END, revisions are treated in reverse
     order.
 
     A range acts as an open interval.  This means that a range of 3:5
     gives 3, 4 and 5.  Similarly, a range of 4:2 gives 4, 3, and 2.
 
 ENVIRONMENT VARIABLES
 ---------------------
 
 HGEDITOR::
     This is the name of the editor to use when committing. Defaults to the
     value of EDITOR.
 
 HGMERGE::
     An executable to use for resolving merge conflicts. The program
     will be executed with three arguments: local file, remote file,
     ancestor file.
 
     The default program is "hgmerge", which is a shell script provided
     by Mercurial with some sensible defaults.
 
 HGUSER::
     This is the string used for the author of a commit.
 
 EMAIL::
     If HGUSER is not set, this will be used as the author for a commit.
 
 LOGNAME::
     If neither HGUSER nor EMAIL is set, LOGNAME will be used (with
     '@hostname' appended) as the author value for a commit.
 
 EDITOR::
     This is the name of the editor used in the hgmerge script. It will be
     used for commit messages if HGEDITOR isn't set. Defaults to 'vi'.
 
 PYTHONPATH::
     This is used by Python to find imported modules and may need to be set
     appropriately if Mercurial is not installed system-wide.
 
 FILES
 -----
  .hgignore::
     This file contains regular expressions (one per line) that describe file
     names that should be ignored by hg.
 
  .hgtags::
     This file contains changeset hash values and text tag names (one of each
     seperated by spaces) that correspond to tagged versions of the repository
     contents.
 
  $HOME/.hgrc, .hg/hgrc::
     This file contains defaults and configuration. Values in .hg/hgrc
     override those in .hgrc.
 
 NAMED REPOSITORIES
 ------------------
 
 To give symbolic names to a repository, create a section in .hgrc
 or .hg/hgrc containing assignments of names to paths. Example:
 
 -----------------
 [paths]
 hg = http://selenic.com/hg
 tah = http://hg.intevation.org/mercurial-tah/
 -----------------
 
 
 LOCAL TAGS
 ----------
 
 To create tags that are local to the repository and not distributed or
 version-controlled, create an hgrc section like the following:
 
 ----------------
 [tags]
 working = 2dcced388cab3677a8f543c3c47a0ad34ac9d435
 tested = 12e0fdbc57a0be78f0e817fd1d170a3615cd35da
 ----------------
 
 
 HOOKS
 -----
 
 Mercurial supports a set of 'hook', commands that get automatically
 executed by various actions such as starting or finishing a commit. To
 specify a hook, simply create an hgrc section like the following:
 
 -----------------
 [hooks]
 precommit = echo "this hook gets executed immediately before a commit"
 commit = hg export $NODE | mail -s "new commit $NODE" commit-list
 -----------------
 
 
 NON_TRANSPARENT PROXY SUPPORT
 -----------------------------
 
 To access a Mercurial repository through a proxy, create a file
 $HOME/.hgrc in the following format:
 
 --------------
 [http_proxy]
 host=myproxy:8080
 user=<username>
 passwd=<password>
 no=<localhost1>,<localhost2>,<localhost3>,...
 --------------
 
 "user" and "passwd" fields are used for authenticating proxies, "no" is a
 comma-separated list of local host names to not proxy.
 
 BUGS
 ----
 Probably lots, please post them to the mailing list (See Resources below)
 when you find them.
 
 AUTHOR
 ------
 Written by Matt Mackall <[e-mail]>
 
 RESOURCES
 ---------
 http://selenic.com/mercurial[Main Web Site]
 
 http://selenic.com/hg[Source code repository]
 
 http://selenic.com/mailman/listinfo/mercurial[Mailing list]
 
 COPYING
 -------
 Copyright (C) 2005 Matt Mackall.
 Free use of this software is granted under the terms of the GNU General
 Public License (GPL).

mercurial/commands.py

@@ -1,1032 +1,1076 b''
 # commands.py - command processing for mercurial
 #
 # Copyright 2005 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
 import os, re, sys, signal
 import fancyopts, ui, hg, util
 from demandload import *
 demandload(globals(), "mdiff time hgweb traceback random signal errno version")
 
 class UnknownCommand(Exception): pass
 
 def filterfiles(filters, files):
     l = [ x for x in files if x in filters ]
 
     for t in filters:
         if t and t[-1] != "/": t += "/"
         l += [ x for x in files if x.startswith(t) ]
     return l
 
 def relfilter(repo, files):
     if os.getcwd() != repo.root:
         p = os.getcwd()[len(repo.root) + 1: ]
         return filterfiles([util.pconvert(p)], files)
     return files
 
 def relpath(repo, args):
     if os.getcwd() != repo.root:
         p = os.getcwd()[len(repo.root) + 1: ]
         return [ util.pconvert(os.path.normpath(os.path.join(p, x)))
                  for x in args ]
     return args
 
 revrangesep = ':'
 
 def revrange(ui, repo, revs = [], revlog = None):
     if revlog is None:
         revlog = repo.changelog
     revcount = revlog.count()
     def fix(val, defval):
         if not val: return defval
         try:
             num = int(val)
             if str(num) != val: raise ValueError
             if num < 0: num += revcount
             if not (0 <= num < revcount):
                 raise ValueError
         except ValueError:
             try:
                 num = repo.changelog.rev(repo.lookup(val))
             except KeyError:
                 try:
                     num = revlog.rev(revlog.lookup(val))
                 except KeyError:
                     ui.warn('abort: invalid revision identifier %s\n' % val)
                     sys.exit(1)
         return num
     for spec in revs:
         if spec.find(revrangesep) >= 0:
             start, end = spec.split(revrangesep, 1)
             start = fix(start, 0)
             end = fix(end, revcount - 1)
             if end > start:
                 end += 1
                 step = 1
             else:
                 end -= 1
                 step = -1
             for rev in xrange(start, end, step):
                 yield str(rev)
         else:
             yield spec
 
 def dodiff(fp, ui, repo, files = None, node1 = None, node2 = None):
     def date(c):
         return time.asctime(time.gmtime(float(c[2].split(' ')[0])))
 
     (c, a, d, u) = repo.changes(node1, node2, files)
     if files:
         c, a, d = map(lambda x: filterfiles(files, x), (c, a, d))
 
     if not c and not a and not d:
         return
 
     if node2:
         change = repo.changelog.read(node2)
         mmap2 = repo.manifest.read(change[0])
         def read(f): return repo.file(f).read(mmap2[f])
         date2 = date(change)
     else:
         date2 = time.asctime()
         if not node1:
             node1 = repo.dirstate.parents()[0]
         def read(f): return repo.wfile(f).read()
 
     if ui.quiet:
         r = None
     else:
         hexfunc = ui.verbose and hg.hex or hg.short
         r = [hexfunc(node) for node in [node1, node2] if node]
 
     change = repo.changelog.read(node1)
     mmap = repo.manifest.read(change[0])
     date1 = date(change)
 
     for f in c:
         to = None
         if f in mmap:
             to = repo.file(f).read(mmap[f])
         tn = read(f)
         fp.write(mdiff.unidiff(to, date1, tn, date2, f, r))
     for f in a:
         to = None
         tn = read(f)
         fp.write(mdiff.unidiff(to, date1, tn, date2, f, r))
     for f in d:
         to = repo.file(f).read(mmap[f])
         tn = None
         fp.write(mdiff.unidiff(to, date1, tn, date2, f, r))
 
 def show_changeset(ui, repo, rev=0, changenode=None, filelog=None):
     """show a single changeset or file revision"""
     changelog = repo.changelog
     if filelog:
         log = filelog
         filerev = rev
         node = filenode = filelog.node(filerev)
         changerev = filelog.linkrev(filenode)
         changenode = changenode or changelog.node(changerev)
     else:
         log = changelog
         changerev = rev
         if changenode is None:
             changenode = changelog.node(changerev)
         elif not changerev:
             rev = changerev = changelog.rev(changenode)
         node = changenode
 
     if ui.quiet:
         ui.write("%d:%s\n" % (rev, hg.hex(node)))
         return
 
     changes = changelog.read(changenode)
 
     parents = [(log.rev(parent), hg.hex(parent))
                for parent in log.parents(node)
                if ui.debugflag or parent != hg.nullid]
     if not ui.debugflag and len(parents) == 1 and parents[0][0] == rev-1:
         parents = []
 
     if filelog:
         ui.write("revision:    %d:%s\n" % (filerev, hg.hex(filenode)))
         for parent in parents:
             ui.write("parent:      %d:%s\n" % parent)
         ui.status("changeset:   %d:%s\n" % (changerev, hg.hex(changenode)))
     else:
         ui.write("changeset:   %d:%s\n" % (changerev, hg.hex(changenode)))
         for tag in repo.nodetags(changenode):
             ui.status("tag:         %s\n" % tag)
         for parent in parents:
             ui.write("parent:      %d:%s\n" % parent)
         ui.note("manifest:    %d:%s\n" % (repo.manifest.rev(changes[0]),
                                           hg.hex(changes[0])))
     ui.status("user:        %s\n" % changes[1])
     ui.status("date:        %s\n" % time.asctime(
         time.localtime(float(changes[2].split(' ')[0]))))
     if ui.debugflag:
         files = repo.changes(changelog.parents(changenode)[0], changenode)
         for key, value in zip(["files:", "files+:", "files-:"], files):
             if value:
                 ui.note("%-12s %s\n" % (key, " ".join(value)))
     else:
         ui.note("files:       %s\n" % " ".join(changes[3]))
     description = changes[4].strip()
     if description:
         if ui.verbose:
             ui.status("description:\n")
             ui.status(description)
             ui.status("\n\n")
         else:
             ui.status("summary:     %s\n" % description.splitlines()[0])
     ui.status("\n")
 
 def show_version(ui):
     """output version and copyright information"""
     ui.write("Mercurial version %s\n" % version.get_version())
     ui.status(
         "\nCopyright (C) 2005 Matt Mackall <[e-mail]>\n"
         "This is free software; see the source for copying conditions. "
         "There is NO\nwarranty; "
         "not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
     )
 
 def help(ui, cmd=None):
     '''show help for a given command or all commands'''
     if cmd:
         try:
             i = find(cmd)
             ui.write("%s\n\n" % i[2])
 
             if i[1]:
                 for s, l, d, c in i[1]:
                     opt=' '
                     if s: opt = opt + '-' + s + ' '
                     if l: opt = opt + '--' + l + ' '
                     if d: opt = opt + '(' + str(d) + ')'
                     ui.write(opt, "\n")
                     if c: ui.write('   %s\n' % c)
                 ui.write("\n")
 
             ui.write(i[0].__doc__, "\n")
         except UnknownCommand:
             ui.warn("hg: unknown command %s\n" % cmd)
         sys.exit(0)
     else:
         if not ui.quiet:
             show_version(ui)
             ui.write('\n')
         ui.write('hg commands:\n\n')
 
         h = {}
         for c, e in table.items():
             f = c.split("|")[0]
             if f.startswith("debug"):
                 continue
             d = ""
             if e[0].__doc__:
                 d = e[0].__doc__.splitlines(0)[0].rstrip()
             h[f] = d
 
         fns = h.keys()
         fns.sort()
         m = max(map(len, fns))
         for f in fns:
             ui.write(' %-*s   %s\n' % (m, f, h[f]))
 
 # Commands start here, listed alphabetically
 
 def add(ui, repo, file, *files):
     '''add the specified files on the next commit'''
     repo.add(relpath(repo, (file,) + files))
 
 def addremove(ui, repo, *files):
     """add all new files, delete all missing files"""
     if files:
         files = relpath(repo, files)
         d = []
         u = []
         for f in files:
             p = repo.wjoin(f)
             s = repo.dirstate.state(f)
             isfile = os.path.isfile(p)
             if s != 'r' and not isfile:
                 d.append(f)
             elif s not in 'nmai' and isfile:
                 u.append(f)
     else:
         (c, a, d, u) = repo.changes(None, None)
     repo.add(u)
     repo.remove(d)
 
 def annotate(u, repo, file, *files, **ops):
     """show changeset information per file line"""
     def getnode(rev):
         return hg.short(repo.changelog.node(rev))
 
     def getname(rev):
         try:
             return bcache[rev]
         except KeyError:
             cl = repo.changelog.read(repo.changelog.node(rev))
             name = cl[1]
             f = name.find('@')
             if f >= 0:
                 name = name[:f]
             f = name.find('<')
             if f >= 0:
                 name = name[f+1:]
             bcache[rev] = name
             return name
 
     bcache = {}
     opmap = [['user', getname], ['number', str], ['changeset', getnode]]
     if not ops['user'] and not ops['changeset']:
         ops['number'] = 1
 
     node = repo.dirstate.parents()[0]
     if ops['revision']:
         node = repo.changelog.lookup(ops['revision'])
     change = repo.changelog.read(node)
     mmap = repo.manifest.read(change[0])
     for f in relpath(repo, (file,) + files):
         lines = repo.file(f).annotate(mmap[f])
         pieces = []
 
         for o, f in opmap:
             if ops[o]:
                 l = [ f(n) for n,t in lines ]
                 m = max(map(len, l))
                 pieces.append([ "%*s" % (m, x) for x in l])
 
         for p,l in zip(zip(*pieces), lines):
             u.write(" ".join(p) + ": " + l[1])
 
 def cat(ui, repo, file, rev = []):
     """output the latest or given revision of a file"""
     r = repo.file(relpath(repo, [file])[0])
     n = r.tip()
     if rev: n = r.lookup(rev)
     sys.stdout.write(r.read(n))
 
 def clone(ui, source, dest = None, **opts):
     """make a copy of an existing repository"""
     source = ui.expandpath(source)
 
     if dest is None:
         dest = os.path.basename(os.path.normpath(source))
 
     if os.path.exists(dest):
         ui.warn("abort: destination '%s' already exists\n" % dest)
         return 1
 
     class dircleanup:
         def __init__(self, dir):
             self.dir = dir
             os.mkdir(dir)
         def close(self):
             self.dir = None
         def __del__(self):
             if self.dir:
                 import shutil
                 shutil.rmtree(self.dir, True)
 
     d = dircleanup(dest)
 
     link = 0
     abspath = source
     if not (source.startswith("http://") or
             source.startswith("hg://") or
             source.startswith("old-http://")):
         abspath = os.path.abspath(source)
         d1 = os.stat(dest).st_dev
         d2 = os.stat(source).st_dev
         if d1 == d2: link = 1
 
     if link:
         ui.note("copying by hardlink\n")
         util.system("cp -al '%s'/.hg '%s'/.hg" % (source, dest))
         try:
             os.remove(os.path.join(dest, ".hg", "dirstate"))
         except: pass
 
         repo = hg.repository(ui, dest)
 
     else:
         repo = hg.repository(ui, dest, create=1)
         other = hg.repository(ui, source)
         fetch = repo.findincoming(other)
         if fetch:
             cg = other.changegroup(fetch)
             repo.addchangegroup(cg)
 
     f = repo.opener("hgrc", "w")
     f.write("[paths]\n")
     f.write("default = %s\n" % abspath)
 
     if not opts['noupdate']:
         update(ui, repo)
 
     d.close()
 
 def commit(ui, repo, *files, **opts):
     """commit the specified files or all outstanding changes"""
     text = opts['text']
     if not text and opts['logfile']:
         try: text = open(opts['logfile']).read()
         except IOError: pass
 
     if opts['addremove']:
         addremove(ui, repo, *files)
     repo.commit(relpath(repo, files), text, opts['user'], opts['date'])
 
 def copy(ui, repo, source, dest):
     """mark a file as copied or renamed for the next commit"""
     return repo.copy(*relpath(repo, (source, dest)))
 
 def debugcheckdirstate(ui, repo):
     parent1, parent2 = repo.dirstate.parents()
     repo.dirstate.read()
     dc = repo.dirstate.map
     keys = dc.keys()
     keys.sort()
     m1n = repo.changelog.read(parent1)[0]
     m2n = repo.changelog.read(parent2)[0]
     m1 = repo.manifest.read(m1n)
     m2 = repo.manifest.read(m2n)
     errors = 0
     for f in dc:
         state = repo.dirstate.state(f)
         if state in "nr" and f not in m1:
             ui.warn("%s in state %s, but not in manifest1\n" % (f, state))
             errors += 1
         if state in "a" and f in m1:
             ui.warn("%s in state %s, but also in manifest1\n" % (f, state))
             errors += 1
         if state in "m" and f not in m1 and f not in m2:
             ui.warn("%s in state %s, but not in either manifest\n" %
                     (f, state))
             errors += 1
     for f in m1:
         state = repo.dirstate.state(f)
         if state not in "nrm":
             ui.warn("%s in manifest1, but listed as state %s" % (f, state))
             errors += 1
     if errors:
         ui.warn(".hg/dirstate inconsistent with current parent's manifest\n")
         sys.exit(1)
 
 def debugdumpdirstate(ui, repo):
     repo.dirstate.read()
     dc = repo.dirstate.map
     keys = dc.keys()
     keys.sort()
     for file in keys:
         ui.write("%c %s\n" % (dc[file][0], file))
 
 def debugindex(ui, file):
     r = hg.revlog(hg.opener(""), file, "")
     ui.write("   rev    offset  length   base linkrev" +
              " p1           p2           nodeid\n")
     for i in range(r.count()):
         e = r.index[i]
         ui.write("% 6d % 9d % 7d % 6d % 7d %s.. %s.. %s..\n" % (
                 i, e[0], e[1], e[2], e[3],
             hg.hex(e[4][:5]), hg.hex(e[5][:5]), hg.hex(e[6][:5])))
 
 def debugindexdot(ui, file):
     r = hg.revlog(hg.opener(""), file, "")
     ui.write("digraph G {\n")
     for i in range(r.count()):
         e = r.index[i]
         ui.write("\t%d -> %d\n" % (r.rev(e[4]), i))
         if e[5] != hg.nullid:
             ui.write("\t%d -> %d\n" % (r.rev(e[5]), i))
     ui.write("}\n")
 
 def diff(ui, repo, *files, **opts):
     """diff working directory (or selected files)"""
     revs = []
     if opts['rev']:
         revs = map(lambda x: repo.lookup(x), opts['rev'])
 
     if len(revs) > 2:
         ui.warn("too many revisions to diff\n")
         sys.exit(1)
 
     if files:
         files = relpath(repo, files)
     else:
         files = relpath(repo, [""])
 
     dodiff(sys.stdout, ui, repo, files, *revs)
 
 def doexport(ui, repo, changeset, seqno, total, revwidth, opts):
     node = repo.lookup(changeset)
     prev, other = repo.changelog.parents(node)
     change = repo.changelog.read(node)
 
     def expand(name):
         expansions = {
             '%': lambda: '%',
             'H': lambda: hg.hex(node),
             'N': lambda: str(total),
             'R': lambda: str(repo.changelog.rev(node)),
             'b': lambda: os.path.basename(repo.root),
             'h': lambda: hg.short(node),
             'n': lambda: str(seqno).zfill(len(str(total))),
             'r': lambda: str(repo.changelog.rev(node)).zfill(revwidth),
             }
         newname = []
         namelen = len(name)
         i = 0
         while i < namelen:
             c = name[i]
             if c == '%':
                 i += 1
                 c = name[i]
                 c = expansions[c]()
             newname.append(c)
             i += 1
         return ''.join(newname)
 
     if opts['output'] and opts['output'] != '-':
         try:
             fp = open(expand(opts['output']), 'w')
         except KeyError, inst:
             ui.warn("error: invalid format spec '%%%s' in output file name\n" %
                     inst.args[0])
             sys.exit(1)
     else:
         fp = sys.stdout
 
     fp.write("# HG changeset patch\n")
     fp.write("# User %s\n" % change[1])
     fp.write("# Node ID %s\n" % hg.hex(node))
     fp.write("# Parent  %s\n" % hg.hex(prev))
     if other != hg.nullid:
         fp.write("# Parent  %s\n" % hg.hex(other))
     fp.write(change[4].rstrip())
     fp.write("\n\n")
 
     dodiff(fp, ui, repo, None, prev, node)
 
 def export(ui, repo, *changesets, **opts):
     """dump the header and diffs for one or more changesets"""
     seqno = 0
     revs = list(revrange(ui, repo, changesets))
     total = len(revs)
     revwidth = max(len(revs[0]), len(revs[-1]))
     for cset in revs:
         seqno += 1
         doexport(ui, repo, cset, seqno, total, revwidth, opts)
 
 def forget(ui, repo, file, *files):
     """don't add the specified files on the next commit"""
     repo.forget(relpath(repo, (file,) + files))
 
 def heads(ui, repo):
     """show current repository heads"""
     for n in repo.changelog.heads():
         show_changeset(ui, repo, changenode=n)
 
 def identify(ui, repo):
     """print information about the working copy"""
     parents = [p for p in repo.dirstate.parents() if p != hg.nullid]
     if not parents:
         ui.write("unknown\n")
         return
 
     hexfunc = ui.verbose and hg.hex or hg.short
     (c, a, d, u) = repo.changes(None, None)
     output = ["%s%s" % ('+'.join([hexfunc(parent) for parent in parents]),
                         (c or a or d) and "+" or "")]
 
     if not ui.quiet:
         # multiple tags for a single parent separated by '/'
         parenttags = ['/'.join(tags)
                       for tags in map(repo.nodetags, parents) if tags]
         # tags for multiple parents separated by ' + '
         output.append(' + '.join(parenttags))
 
     ui.write("%s\n" % ' '.join(output))
 
 def import_(ui, repo, patch1, *patches, **opts):
     """import an ordered set of patches"""
     try:
         import psyco
         psyco.full()
     except:
         pass
 
     patches = (patch1,) + patches
 
     d = opts["base"]
     strip = opts["strip"]
 
     for patch in patches:
         ui.status("applying %s\n" % patch)
         pf = os.path.join(d, patch)
 
         text = ""
         for l in file(pf):
             if l[:4] == "--- ": break
             text += l
 
         # make sure text isn't empty
         if not text: text = "imported patch %s\n" % patch
 
         f = os.popen("patch -p%d < %s" % (strip, pf))
         files = []
         for l in f.read().splitlines():
             l.rstrip('\r\n');
             ui.status("%s\n" % l)
             if l[:14] == 'patching file ':
                 pf = l[14:]
                 if pf not in files:
                     files.append(pf)
         patcherr = f.close()
         if patcherr:
             sys.stderr.write("patch failed")
             sys.exit(1)
 
         if len(files) > 0:
             addremove(ui, repo, *files)
         repo.commit(files, text)
 
 def init(ui, source=None):
     """create a new repository in the current directory"""
 
     if source:
         ui.warn("no longer supported: use \"hg clone\" instead\n")
         sys.exit(1)
     repo = hg.repository(ui, ".", create=1)
 
 def log(ui, repo, f=None, **opts):
     """show the revision history of the repository or a single file"""
     if f:
         filelog = repo.file(relpath(repo, [f])[0])
         log = filelog
         lookup = filelog.lookup
     else:
         filelog = None
         log = repo.changelog
         lookup = repo.lookup
     revlist = []
     revs = [log.rev(lookup(rev)) for rev in opts['rev']]
     while revs:
         if len(revs) == 1:
             revlist.append(revs.pop(0))
         else:
             a = revs.pop(0)
             b = revs.pop(0)
             off = a > b and -1 or 1
             revlist.extend(range(a, b + off, off))
     for i in revlist or range(log.count() - 1, -1, -1):
         show_changeset(ui, repo, filelog=filelog, rev=i)
 
 def manifest(ui, repo, rev = []):
     """output the latest or given revision of the project manifest"""
     n = repo.manifest.tip()
     if rev:
         n = repo.manifest.lookup(rev)
     m = repo.manifest.read(n)
     mf = repo.manifest.readflags(n)
     files = m.keys()
     files.sort()
 
     for f in files:
         ui.write("%40s %3s %s\n" % (hg.hex(m[f]), mf[f] and "755" or "644", f))
 
 def parents(ui, repo, node = None):
     '''show the parents of the current working dir'''
     if node:
         p = repo.changelog.parents(repo.lookup(hg.bin(node)))
     else:
         p = repo.dirstate.parents()
 
     for n in p:
         if n != hg.nullid:
             show_changeset(ui, repo, changenode=n)
 
 def pull(ui, repo, source="default", **opts):
     """pull changes from the specified source"""
     source = ui.expandpath(source)
 
     ui.status('pulling from %s\n' % (source))
 
     other = hg.repository(ui, source)
     fetch = repo.findincoming(other)
     if not fetch:
         ui.status("no changes found\n")
         return
 
     cg = other.changegroup(fetch)
     r = repo.addchangegroup(cg)
     if cg and not r:
         if opts['update']:
             return update(ui, repo)
         else:
             ui.status("(run 'hg update' to get a working copy)\n")
 
     return r
 
 def push(ui, repo, dest="default-push"):
     """push changes to the specified destination"""
     dest = ui.expandpath(dest)
 
     if not dest.startswith("ssh://"):
         ui.warn("abort: can only push to ssh:// destinations currently\n")
         return 1
 
     m = re.match(r'ssh://(([^@]+)@)?([^:/]+)(:(\d+))?(/(.*))?', dest)
     if not m:
         ui.warn("abort: couldn't parse destination %s\n" % dest)
         return 1
 
     user, host, port, path = map(m.group, (2, 3, 5, 7))
     uhost = user and ("%s@%s" % (user, host)) or host
     port = port and (" -p %s") % port or ""
     path = path or ""
 
     sport = random.randrange(30000, 60000)
     cmd = "ssh %s%s -R %d:localhost:%d 'cd %s; hg pull http://localhost:%d/'"
     cmd = cmd % (uhost, port, sport+1, sport, path, sport+1)
 
     child = os.fork()
     if not child:
         sys.stdout = file("/dev/null", "w")
         sys.stderr = sys.stdout
         hgweb.server(repo.root, "pull", "", "localhost", sport)
     else:
         ui.status("connecting to %s\n" % host)
         r = os.system(cmd)
         os.kill(child, signal.SIGTERM)
         return r
 
 def rawcommit(ui, repo, *flist, **rc):
     "raw commit interface"
 
     text = rc['text']
     if not text and rc['logfile']:
         try: text = open(rc['logfile']).read()
         except IOError: pass
     if not text and not rc['logfile']:
         ui.warn("abort: missing commit text\n")
         return 1
 
     files = relpath(repo, list(flist))
     if rc['files']:
         files += open(rc['files']).read().splitlines()
 
     rc['parent'] = map(repo.lookup, rc['parent'])
 
     repo.rawcommit(files, text, rc['user'], rc['date'], *rc['parent'])
 
 def recover(ui, repo):
     """roll back an interrupted transaction"""
     repo.recover()
 
 def remove(ui, repo, file, *files):
     """remove the specified files on the next commit"""
     repo.remove(relpath(repo, (file,) + files))
 
+def revert(ui, repo, *names, **opts):
+    """revert modified files or dirs back to their unmodified states"""
+    node = opts['rev'] and repo.lookup(opts['rev']) or repo.changelog.tip()
+    root = os.path.realpath(repo.root)
+    def trimpath(p):
+        p = os.path.realpath(p)
+        if p.startswith(root):
+            rest = p[len(root):]
+            if not rest:
+                return rest
+            if p.startswith(os.sep):
+                return rest[1:]
+            return p
+    relnames = map(trimpath, names or [os.getcwd()])
+    chosen = {}
+    def choose(name):
+        def body(name):
+            for r in relnames:
+                if not name.startswith(r): continue
+                rest = name[len(r):]
+                if not rest: return r, True
+                depth = rest.count(os.sep)
+                if not r:
+                    if depth == 0 or not opts['nonrecursive']: return r, True
+                elif rest[0] == os.sep:
+                    if depth == 1 or not opts['nonrecursive']: return r, True
+            return None, False
+        relname, ret = body(name)
+        if ret:
+            chosen[relname] = 1
+        return ret
+
+    r = repo.update(node, False, True, choose, False)
+    for n in relnames:
+        if n not in chosen:
+            ui.warn('error: no matches for %s\n' % n)
+            r = 1
+    sys.stdout.flush()
+    return r
+
 def root(ui, repo):
     """print the root (top) of the current working dir"""
     ui.write(repo.root + "\n")
 
 def serve(ui, repo, **opts):
     """export the repository via HTTP"""
     hgweb.server(repo.root, opts["name"], opts["templates"],
                  opts["address"], opts["port"])
 
 def status(ui, repo):
     '''show changed files in the working directory
 
     C = changed
     A = added
     R = removed
     ? = not tracked'''
 
     (c, a, d, u) = repo.changes(None, None)
     (c, a, d, u) = map(lambda x: relfilter(repo, x), (c, a, d, u))
 
     for f in c: ui.write("C ", f, "\n")
     for f in a: ui.write("A ", f, "\n")
     for f in d: ui.write("R ", f, "\n")
     for f in u: ui.write("? ", f, "\n")
 
 def tag(ui, repo, name, rev = None, **opts):
     """add a tag for the current tip or a given revision"""
 
     if name == "tip":
         ui.warn("abort: 'tip' is a reserved name!\n")
         return -1
     if name.find(revrangesep) >= 0:
         ui.warn("abort: '%s' cannot be used in a tag name\n" % revrangesep)
         return -1
 
     (c, a, d, u) = repo.changes(None, None)
     for x in (c, a, d, u):
         if ".hgtags" in x:
             ui.warn("abort: working copy of .hgtags is changed!\n")
             ui.status("(please commit .hgtags manually)\n")
             return -1
 
     if rev:
         r = hg.hex(repo.lookup(rev))
     else:
         r = hg.hex(repo.changelog.tip())
 
     add = 0
     if not os.path.exists(repo.wjoin(".hgtags")): add = 1
     repo.wfile(".hgtags", "a").write("%s %s\n" % (r, name))
     if add: repo.add([".hgtags"])
 
     if not opts['text']:
         opts['text'] = "Added tag %s for changeset %s" % (name, r)
 
     repo.commit([".hgtags"], opts['text'], opts['user'], opts['date'])
 
 def tags(ui, repo):
     """list repository tags"""
 
     l = repo.tagslist()
     l.reverse()
     for t, n in l:
         try:
             r = "%5d:%s" % (repo.changelog.rev(n), hg.hex(n))
         except KeyError:
             r = "    ?:?"
         ui.write("%-30s %s\n" % (t, r))
 
 def tip(ui, repo):
     """show the tip revision"""
     n = repo.changelog.tip()
     show_changeset(ui, repo, changenode=n)
 
 def undo(ui, repo):
     """undo the last transaction"""
     repo.undo()
 
 def update(ui, repo, node=None, merge=False, clean=False):
     '''update or merge working directory
 
     If there are no outstanding changes in the working directory and
     there is a linear relationship between the current version and the
     requested version, the result is the requested version.
 
     Otherwise the result is a merge between the contents of the
     current working directory and the requested version. Files that
     changed between either parent are marked as changed for the next
     commit and a commit must be performed before any further updates
     are allowed.
     '''
     node = node and repo.lookup(node) or repo.changelog.tip()
     return repo.update(node, allow=merge, force=clean)
 
 def verify(ui, repo):
     """verify the integrity of the repository"""
     return repo.verify()
 
 # Command options and aliases are listed here, alphabetically
 
 table = {
     "add": (add, [], "hg add [files]"),
     "addremove": (addremove, [], "hg addremove [files]"),
     "annotate": (annotate,
                      [('r', 'revision', '', 'revision'),
                       ('u', 'user', None, 'show user'),
                       ('n', 'number', None, 'show revision number'),
                       ('c', 'changeset', None, 'show changeset')],
                      'hg annotate [-u] [-c] [-n] [-r id] [files]'),
     "cat": (cat, [], 'hg cat <file> [rev]'),
     "clone": (clone, [('U', 'noupdate', None, 'skip update after cloning')],
               'hg clone [options] <source> [dest]'),
     "commit|ci": (commit,
                   [('t', 'text', "", 'commit text'),
                    ('A', 'addremove', None, 'run add/remove during commit'),
                    ('l', 'logfile', "", 'commit text file'),
                    ('d', 'date', "", 'data'),
                    ('u', 'user', "", 'user')],
                   'hg commit [files]'),
     "copy": (copy, [], 'hg copy <source> <dest>'),
     "debugcheckdirstate": (debugcheckdirstate, [], 'debugcheckdirstate'),
     "debugdumpdirstate": (debugdumpdirstate, [], 'debugdumpdirstate'),
     "debugindex": (debugindex, [], 'debugindex <file>'),
     "debugindexdot": (debugindexdot, [], 'debugindexdot <file>'),
     "diff": (diff, [('r', 'rev', [], 'revision')],
              'hg diff [-r A] [-r B] [files]'),
     "export": (export, [('o', 'output', "", 'output to file')],
                "hg export [-o file] <changeset> ..."),
     "forget": (forget, [], "hg forget [files]"),
     "heads": (heads, [], 'hg heads'),
     "help": (help, [], 'hg help [command]'),
     "identify|id": (identify, [], 'hg identify'),
     "import|patch": (import_,
                      [('p', 'strip', 1, 'path strip'),
                       ('b', 'base', "", 'base path')],
                      "hg import [options] <patches>"),
     "init": (init, [], 'hg init'),
     "log|history": (log,
                     [('r', 'rev', [], 'revision')],
                     'hg log [-r A] [-r B] [file]'),
     "manifest": (manifest, [], 'hg manifest [rev]'),
     "parents": (parents, [], 'hg parents [node]'),
     "pull": (pull,
                   [('u', 'update', None, 'update working directory')],
                   'hg pull [options] [source]'),
     "push": (push, [], 'hg push <destination>'),
     "rawcommit": (rawcommit,
                   [('p', 'parent', [], 'parent'),
                    ('d', 'date', "", 'data'),
                    ('u', 'user', "", 'user'),
                    ('F', 'files', "", 'file list'),
                    ('t', 'text', "", 'commit text'),
                    ('l', 'logfile', "", 'commit text file')],
                   'hg rawcommit [options] [files]'),
     "recover": (recover, [], "hg recover"),
     "remove|rm": (remove, [], "hg remove [files]"),
+    "revert": (revert,
+               [("n", "nonrecursive", None, "don't recurse into subdirs"),
+                ("r", "rev", "", "revision")],
+               "hg revert [files|dirs]"),
     "root": (root, [], "hg root"),
     "serve": (serve, [('p', 'port', 8000, 'listen port'),
                       ('a', 'address', '', 'interface address'),
                       ('n', 'name', os.getcwd(), 'repository name'),
                       ('t', 'templates', "", 'template map')],
               "hg serve [options]"),
     "status": (status, [], 'hg status'),
     "tag": (tag,  [('t', 'text', "", 'commit text'),
                    ('d', 'date', "", 'date'),
                    ('u', 'user', "", 'user')],
             'hg tag [options] <name> [rev]'),
     "tags": (tags, [], 'hg tags'),
     "tip": (tip, [], 'hg tip'),
     "undo": (undo, [], 'hg undo'),
     "update|up|checkout|co":
             (update,
              [('m', 'merge', None, 'allow merging of conflicts'),
               ('C', 'clean', None, 'overwrite locally modified files')],
              'hg update [options] [node]'),
     "verify": (verify, [], 'hg verify'),
     "version": (show_version, [], 'hg version'),
     }
 
 norepo = "clone init version help debugindex debugindexdot"
 
 def find(cmd):
     for e in table.keys():
         if re.match("(%s)$" % e, cmd):
             return table[e]
 
     raise UnknownCommand(cmd)
 
 class SignalInterrupt(Exception): pass
 
 def catchterm(*args):
     raise SignalInterrupt
 
 def run():
     sys.exit(dispatch(sys.argv[1:]))
 
 def dispatch(args):
     options = {}
     opts = [('v', 'verbose', None, 'verbose'),
             ('d', 'debug', None, 'debug'),
             ('q', 'quiet', None, 'quiet'),
             ('', 'profile', None, 'profile'),
             ('R', 'repository', "", 'repository root directory'),
             ('', 'traceback', None, 'print traceback on exception'),
             ('y', 'noninteractive', None, 'run non-interactively'),
             ('', 'version', None, 'output version information and exit'),
             ]
 
     args = fancyopts.fancyopts(args, opts, options,
                                'hg [options] <command> [options] [files]')
 
     if not args:
         cmd = "help"
     else:
         cmd, args = args[0], args[1:]
 
     u = ui.ui(options["verbose"], options["debug"], options["quiet"],
            not options["noninteractive"])
 
     if options["version"]:
         show_version(u)
         sys.exit(0)
 
     try:
         i = find(cmd)
     except UnknownCommand:
         u.warn("hg: unknown command '%s'\n" % cmd)
         help(u)
         sys.exit(1)
 
     signal.signal(signal.SIGTERM, catchterm)
 
     cmdoptions = {}
     try:
         args = fancyopts.fancyopts(args, i[1], cmdoptions, i[2])
     except fancyopts.getopt.GetoptError, inst:
         u.warn("hg %s: %s\n" % (cmd, inst))
         help(u, cmd)
         sys.exit(-1)
 
     try:
         try:
             if cmd not in norepo.split():
                 path = options["repository"] or ""
                 repo = hg.repository(ui=u, path=path)
                 d = lambda: i[0](u, repo, *args, **cmdoptions)
             else:
                 d = lambda: i[0](u, *args, **cmdoptions)
 
             if options['profile']:
                 import hotshot, hotshot.stats
                 prof = hotshot.Profile("hg.prof")
                 r = prof.runcall(d)
                 prof.close()
                 stats = hotshot.stats.load("hg.prof")
                 stats.strip_dirs()
                 stats.sort_stats('time', 'calls')
                 stats.print_stats(40)
                 return r
             else:
                 return d()
         except:
             if options['traceback']:
                 traceback.print_exc()
             raise
     except util.CommandError, inst:
         u.warn("abort: %s\n" % inst.args)
     except hg.RepoError, inst:
         u.warn("abort: ", inst, "!\n")
     except SignalInterrupt:
         u.warn("killed!\n")
     except KeyboardInterrupt:
         u.warn("interrupted!\n")
     except IOError, inst:
         if hasattr(inst, "code"):
             u.warn("abort: %s\n" % inst)
         elif hasattr(inst, "reason"):
             u.warn("abort: error %d: %s\n" % (inst.reason[0], inst.reason[1]))
         elif hasattr(inst, "args") and inst[0] == errno.EPIPE:
             u.warn("broken pipe\n")
         else:
             raise
     except OSError, inst:
         if hasattr(inst, "filename"):
             u.warn("abort: %s: %s\n" % (inst.strerror, inst.filename))
         else:
             u.warn("abort: %s\n" % inst.strerror)
     except TypeError, inst:
         # was this an argument error?
         tb = traceback.extract_tb(sys.exc_info()[2])
         if len(tb) > 2: # no
             raise
         u.debug(inst, "\n")
         u.warn("%s: invalid arguments\n" % i[0].__name__)
         help(u, cmd)
 
     sys.exit(-1)

mercurial/hg.py

@@ -1,1544 +1,1552 b''
 # hg.py - repository classes for mercurial
 #
 # Copyright 2005 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
 import sys, struct, os
 import util
 from revlog import *
 from demandload import *
 demandload(globals(), "re lock urllib urllib2 transaction time socket")
 demandload(globals(), "tempfile httprangereader bdiff")
 
 class filelog(revlog):
     def __init__(self, opener, path):
         revlog.__init__(self, opener,
                         os.path.join("data", path + ".i"),
                         os.path.join("data", path + ".d"))
 
     def read(self, node):
         t = self.revision(node)
         if t[:2] != '\1\n':
             return t
         s = t.find('\1\n', 2)
         return t[s+2:]
 
     def readmeta(self, node):
         t = self.revision(node)
         if t[:2] != '\1\n':
             return t
         s = t.find('\1\n', 2)
         mt = t[2:s]
         for l in mt.splitlines():
             k, v = l.split(": ", 1)
             m[k] = v
         return m
 
     def add(self, text, meta, transaction, link, p1=None, p2=None):
         if meta or text[:2] == '\1\n':
             mt = ""
             if meta:
                 mt = [ "%s: %s\n" % (k, v) for k,v in meta.items() ]
             text = "\1\n" + "".join(mt) + "\1\n" + text
         return self.addrevision(text, transaction, link, p1, p2)
 
     def annotate(self, node):
 
         def decorate(text, rev):
             return ([rev] * len(text.splitlines()), text)
 
         def pair(parent, child):
             for a1, a2, b1, b2 in bdiff.blocks(parent[1], child[1]):
                 child[0][b1:b2] = parent[0][a1:a2]
             return child
 
         # find all ancestors
         needed = {node:1}
         visit = [node]
         while visit:
             n = visit.pop(0)
             for p in self.parents(n):
                 if p not in needed:
                     needed[p] = 1
                     visit.append(p)
                 else:
                     # count how many times we'll use this
                     needed[p] += 1
 
         # sort by revision which is a topological order
         visit = [ (self.rev(n), n) for n in needed.keys() ]
         visit.sort()
         hist = {}
 
         for r,n in visit:
             curr = decorate(self.read(n), self.linkrev(n))
             for p in self.parents(n):
                 if p != nullid:
                     curr = pair(hist[p], curr)
                     # trim the history of unneeded revs
                     needed[p] -= 1
                     if not needed[p]:
                         del hist[p]
             hist[n] = curr
 
         return zip(hist[n][0], hist[n][1].splitlines(1))
 
 class manifest(revlog):
     def __init__(self, opener):
         self.mapcache = None
         self.listcache = None
         self.addlist = None
         revlog.__init__(self, opener, "00manifest.i", "00manifest.d")
 
     def read(self, node):
         if node == nullid: return {} # don't upset local cache
         if self.mapcache and self.mapcache[0] == node:
             return self.mapcache[1]
         text = self.revision(node)
         map = {}
         flag = {}
         self.listcache = (text, text.splitlines(1))
         for l in self.listcache[1]:
             (f, n) = l.split('\0')
             map[f] = bin(n[:40])
             flag[f] = (n[40:-1] == "x")
         self.mapcache = (node, map, flag)
         return map
 
     def readflags(self, node):
         if node == nullid: return {} # don't upset local cache
         if not self.mapcache or self.mapcache[0] != node:
             self.read(node)
         return self.mapcache[2]
 
     def diff(self, a, b):
         # this is sneaky, as we're not actually using a and b
         if self.listcache and self.addlist and self.listcache[0] == a:
             d = mdiff.diff(self.listcache[1], self.addlist, 1)
             if mdiff.patch(a, d) != b:
                 sys.stderr.write("*** sortdiff failed, falling back ***\n")
                 return mdiff.textdiff(a, b)
             return d
         else:
             return mdiff.textdiff(a, b)
 
     def add(self, map, flags, transaction, link, p1=None, p2=None):
         files = map.keys()
         files.sort()
 
         self.addlist = ["%s\000%s%s\n" %
                         (f, hex(map[f]), flags[f] and "x" or '')
                         for f in files]
         text = "".join(self.addlist)
 
         n = self.addrevision(text, transaction, link, p1, p2)
         self.mapcache = (n, map, flags)
         self.listcache = (text, self.addlist)
         self.addlist = None
 
         return n
 
 class changelog(revlog):
     def __init__(self, opener):
         revlog.__init__(self, opener, "00changelog.i", "00changelog.d")
 
     def extract(self, text):
         if not text:
             return (nullid, "", "0", [], "")
         last = text.index("\n\n")
         desc = text[last + 2:]
         l = text[:last].splitlines()
         manifest = bin(l[0])
         user = l[1]
         date = l[2]
         files = l[3:]
         return (manifest, user, date, files, desc)
 
     def read(self, node):
         return self.extract(self.revision(node))
 
     def add(self, manifest, list, desc, transaction, p1=None, p2=None,
                   user=None, date=None):
         user = (user or
                 os.environ.get("HGUSER") or
                 os.environ.get("EMAIL") or
                 (os.environ.get("LOGNAME",
                                os.environ.get("USERNAME", "unknown"))
                  + '@' + socket.getfqdn()))
         date = date or "%d %d" % (time.time(), time.timezone)
         list.sort()
         l = [hex(manifest), user, date] + list + ["", desc]
         text = "\n".join(l)
         return self.addrevision(text, transaction, self.count(), p1, p2)
 
 class dirstate:
     def __init__(self, opener, ui, root):
         self.opener = opener
         self.root = root
         self.dirty = 0
         self.ui = ui
         self.map = None
         self.pl = None
         self.copies = {}
 
     def __del__(self):
         if self.dirty:
             self.write()
 
     def __getitem__(self, key):
         try:
             return self.map[key]
         except TypeError:
             self.read()
             return self[key]
 
     def __contains__(self, key):
         if not self.map: self.read()
         return key in self.map
 
     def parents(self):
         if not self.pl:
             self.read()
         return self.pl
 
     def setparents(self, p1, p2 = nullid):
         self.dirty = 1
         self.pl = p1, p2
 
     def state(self, key):
         try:
             return self[key][0]
         except KeyError:
             return "?"
 
     def read(self):
         if self.map is not None: return self.map
 
         self.map = {}
         self.pl = [nullid, nullid]
         try:
             st = self.opener("dirstate").read()
             if not st: return
         except: return
 
         self.pl = [st[:20], st[20: 40]]
 
         pos = 40
         while pos < len(st):
             e = struct.unpack(">cllll", st[pos:pos+17])
             l = e[4]
             pos += 17
             f = st[pos:pos + l]
             if '\0' in f:
                 f, c = f.split('\0')
                 self.copies[f] = c
             self.map[f] = e[:4]
             pos += l
 
     def copy(self, source, dest):
         self.read()
         self.dirty = 1
         self.copies[dest] = source
 
     def copied(self, file):
         return self.copies.get(file, None)
 
     def update(self, files, state):
         ''' current states:
         n  normal
         m  needs merging
         r  marked for removal
         a  marked for addition'''
 
         if not files: return
         self.read()
         self.dirty = 1
         for f in files:
             if state == "r":
                 self.map[f] = ('r', 0, 0, 0)
             else:
                 s = os.stat(os.path.join(self.root, f))
                 self.map[f] = (state, s.st_mode, s.st_size, s.st_mtime)
 
     def forget(self, files):
         if not files: return
         self.read()
         self.dirty = 1
         for f in files:
             try:
                 del self.map[f]
             except KeyError:
                 self.ui.warn("not in dirstate: %s!\n" % f)
                 pass
 
     def clear(self):
         self.map = {}
         self.dirty = 1
 
     def write(self):
         st = self.opener("dirstate", "w")
         st.write("".join(self.pl))
         for f, e in self.map.items():
             c = self.copied(f)
             if c:
                 f = f + "\0" + c
             e = struct.pack(">cllll", e[0], e[1], e[2], e[3], len(f))
             st.write(e + f)
         self.dirty = 0
 
     def changes(self, files, ignore):
         self.read()
         dc = self.map.copy()
         lookup, changed, added, unknown = [], [], [], []
 
         # compare all files by default
         if not files: files = [self.root]
 
         # recursive generator of all files listed
         def walk(files):
             for f in util.unique(files):
                 f = os.path.join(self.root, f)
                 if os.path.isdir(f):
                     for dir, subdirs, fl in os.walk(f):
                         d = dir[len(self.root) + 1:]
                         if ".hg" in subdirs: subdirs.remove(".hg")
                         for fn in fl:
                             fn = util.pconvert(os.path.join(d, fn))
                             yield fn
                 else:
                     yield f[len(self.root) + 1:]
 
         for fn in util.unique(walk(files)):
             try: s = os.stat(os.path.join(self.root, fn))
             except: continue
 
             if fn in dc:
                 c = dc[fn]
                 del dc[fn]
 
                 if c[0] == 'm':
                     changed.append(fn)
                 elif c[0] == 'a':
                     added.append(fn)
                 elif c[0] == 'r':
                     unknown.append(fn)
                 elif c[2] != s.st_size or (c[1] ^ s.st_mode) & 0100:
                     changed.append(fn)
                 elif c[1] != s.st_mode or c[3] != s.st_mtime:
                     lookup.append(fn)
             else:
                 if not ignore(fn): unknown.append(fn)
 
         return (lookup, changed, added, dc.keys(), unknown)
 
 # used to avoid circular references so destructors work
 def opener(base):
     p = base
     def o(path, mode="r"):
         if p[:7] == "http://":
             f = os.path.join(p, urllib.quote(path))
             return httprangereader.httprangereader(f)
 
         f = os.path.join(p, path)
 
         mode += "b" # for that other OS
 
         if mode[0] != "r":
             try:
                 s = os.stat(f)
             except OSError:
                 d = os.path.dirname(f)
                 if not os.path.isdir(d):
                     os.makedirs(d)
             else:
                 if s.st_nlink > 1:
                     file(f + ".tmp", "wb").write(file(f, "rb").read())
                     util.rename(f+".tmp", f)
 
         return file(f, mode)
 
     return o
 
 class RepoError(Exception): pass
 
 class localrepository:
     def __init__(self, ui, path=None, create=0):
         self.remote = 0
         if path and path[:7] == "http://":
             self.remote = 1
             self.path = path
         else:
             if not path:
                 p = os.getcwd()
                 while not os.path.isdir(os.path.join(p, ".hg")):
                     oldp = p
                     p = os.path.dirname(p)
                     if p == oldp: raise RepoError("no repo found")
                 path = p
             self.path = os.path.join(path, ".hg")
 
             if not create and not os.path.isdir(self.path):
                 raise RepoError("repository %s not found" % self.path)
 
         self.root = path
         self.ui = ui
 
         if create:
             os.mkdir(self.path)
             os.mkdir(self.join("data"))
 
         self.opener = opener(self.path)
         self.wopener = opener(self.root)
         self.manifest = manifest(self.opener)
         self.changelog = changelog(self.opener)
         self.ignorelist = None
         self.tagscache = None
         self.nodetagscache = None
 
         if not self.remote:
             self.dirstate = dirstate(self.opener, ui, self.root)
             try:
                 self.ui.readconfig(self.opener("hgrc"))
             except IOError: pass
 
     def ignore(self, f):
         if self.ignorelist is None:
             self.ignorelist = []
             try:
                 l = file(self.wjoin(".hgignore"))
                 for pat in l:
                     if pat != "\n":
                         self.ignorelist.append(re.compile(util.pconvert(pat[:-1])))
             except IOError: pass
         for pat in self.ignorelist:
             if pat.search(f): return True
         return False
 
     def hook(self, name, **args):
         s = self.ui.config("hooks", name)
         if s:
             self.ui.note("running hook %s: %s\n" % (name, s))
             old = {}
             for k, v in args.items():
                 k = k.upper()
                 old[k] = os.environ.get(k, None)
                 os.environ[k] = v
 
             r = os.system(s)
 
             for k, v in old.items():
                 if v != None:
                     os.environ[k] = v
                 else:
                     del os.environ[k]
 
             if r:
                 self.ui.warn("abort: %s hook failed with status %d!\n" %
                              (name, r))
                 return False
         return True
 
     def tags(self):
         '''return a mapping of tag to node'''
         if not self.tagscache:
             self.tagscache = {}
             try:
                 # read each head of the tags file, ending with the tip
                 # and add each tag found to the map, with "newer" ones
                 # taking precedence
                 fl = self.file(".hgtags")
                 h = fl.heads()
                 h.reverse()
                 for r in h:
                     for l in fl.revision(r).splitlines():
                         if l:
                             n, k = l.split(" ", 1)
                             try:
                                 bin_n = bin(n)
                             except TypeError:
                                 bin_n = ''
                             self.tagscache[k.strip()] = bin_n
             except KeyError:
                 pass
             for k, n in self.ui.configitems("tags"):
                 try:
                     bin_n = bin(n)
                 except TypeError:
                     bin_n = ''
                 self.tagscache[k] = bin_n
 
             self.tagscache['tip'] = self.changelog.tip()
 
         return self.tagscache
 
     def tagslist(self):
         '''return a list of tags ordered by revision'''
         l = []
         for t, n in self.tags().items():
             try:
                 r = self.changelog.rev(n)
             except:
                 r = -2 # sort to the beginning of the list if unknown
             l.append((r,t,n))
         l.sort()
         return [(t,n) for r,t,n in l]
 
     def nodetags(self, node):
         '''return the tags associated with a node'''
         if not self.nodetagscache:
             self.nodetagscache = {}
             for t,n in self.tags().items():
                 self.nodetagscache.setdefault(n,[]).append(t)
         return self.nodetagscache.get(node, [])
 
     def lookup(self, key):
         try:
             return self.tags()[key]
         except KeyError:
             return self.changelog.lookup(key)
 
     def join(self, f):
         return os.path.join(self.path, f)
 
     def wjoin(self, f):
         return os.path.join(self.root, f)
 
     def file(self, f):
         if f[0] == '/': f = f[1:]
         return filelog(self.opener, f)
 
     def wfile(self, f, mode='r'):
         return self.wopener(f, mode)
 
     def transaction(self):
         # save dirstate for undo
         try:
             ds = self.opener("dirstate").read()
         except IOError:
             ds = ""
         self.opener("undo.dirstate", "w").write(ds)
 
         return transaction.transaction(self.ui.warn,
                                        self.opener, self.join("journal"),
                                        self.join("undo"))
 
     def recover(self):
         lock = self.lock()
         if os.path.exists(self.join("journal")):
             self.ui.status("rolling back interrupted transaction\n")
             return transaction.rollback(self.opener, self.join("journal"))
         else:
             self.ui.warn("no interrupted transaction available\n")
 
     def undo(self):
         lock = self.lock()
         if os.path.exists(self.join("undo")):
             self.ui.status("rolling back last transaction\n")
             transaction.rollback(self.opener, self.join("undo"))
             self.dirstate = None
             util.rename(self.join("undo.dirstate"), self.join("dirstate"))
             self.dirstate = dirstate(self.opener, self.ui, self.root)
         else:
             self.ui.warn("no undo information available\n")
 
     def lock(self, wait = 1):
         try:
             return lock.lock(self.join("lock"), 0)
         except lock.LockHeld, inst:
             if wait:
                 self.ui.warn("waiting for lock held by %s\n" % inst.args[0])
                 return lock.lock(self.join("lock"), wait)
             raise inst
 
     def rawcommit(self, files, text, user, date, p1=None, p2=None):
         orig_parent = self.dirstate.parents()[0] or nullid
         p1 = p1 or self.dirstate.parents()[0] or nullid
         p2 = p2 or self.dirstate.parents()[1] or nullid
         c1 = self.changelog.read(p1)
         c2 = self.changelog.read(p2)
         m1 = self.manifest.read(c1[0])
         mf1 = self.manifest.readflags(c1[0])
         m2 = self.manifest.read(c2[0])
 
         if orig_parent == p1:
             update_dirstate = 1
         else:
             update_dirstate = 0
 
         tr = self.transaction()
         mm = m1.copy()
         mfm = mf1.copy()
         linkrev = self.changelog.count()
         for f in files:
             try:
                 t = self.wfile(f).read()
                 tm = util.is_exec(self.wjoin(f), mfm.get(f, False))
                 r = self.file(f)
                 mfm[f] = tm
                 mm[f] = r.add(t, {}, tr, linkrev,
                               m1.get(f, nullid), m2.get(f, nullid))
                 if update_dirstate:
                     self.dirstate.update([f], "n")
             except IOError:
                 try:
                     del mm[f]
                     del mfm[f]
                     if update_dirstate:
                         self.dirstate.forget([f])
                 except:
                     # deleted from p2?
                     pass
 
         mnode = self.manifest.add(mm, mfm, tr, linkrev, c1[0], c2[0])
         n = self.changelog.add(mnode, files, text, tr, p1, p2, user, date)
         tr.close()
         if update_dirstate:
             self.dirstate.setparents(n, nullid)
 
     def commit(self, files = None, text = "", user = None, date = None):
         commit = []
         remove = []
         if files:
             for f in files:
                 s = self.dirstate.state(f)
                 if s in 'nmai':
                     commit.append(f)
                 elif s == 'r':
                     remove.append(f)
                 else:
                     self.ui.warn("%s not tracked!\n" % f)
         else:
             (c, a, d, u) = self.changes(None, None)
             commit = c + a
             remove = d
 
         if not commit and not remove:
             self.ui.status("nothing changed\n")
             return
 
         if not self.hook("precommit"):
             return 1
 
         p1, p2 = self.dirstate.parents()
         c1 = self.changelog.read(p1)
         c2 = self.changelog.read(p2)
         m1 = self.manifest.read(c1[0])
         mf1 = self.manifest.readflags(c1[0])
         m2 = self.manifest.read(c2[0])
         lock = self.lock()
         tr = self.transaction()
 
         # check in files
         new = {}
         linkrev = self.changelog.count()
         commit.sort()
         for f in commit:
             self.ui.note(f + "\n")
             try:
                 mf1[f] = util.is_exec(self.wjoin(f), mf1.get(f, False))
                 t = self.wfile(f).read()
             except IOError:
                 self.warn("trouble committing %s!\n" % f)
                 raise
 
             meta = {}
             cp = self.dirstate.copied(f)
             if cp:
                 meta["copy"] = cp
                 meta["copyrev"] = hex(m1.get(cp, m2.get(cp, nullid)))
                 self.ui.debug(" %s: copy %s:%s\n" % (f, cp, meta["copyrev"]))
 
             r = self.file(f)
             fp1 = m1.get(f, nullid)
             fp2 = m2.get(f, nullid)
             new[f] = r.add(t, meta, tr, linkrev, fp1, fp2)
 
         # update manifest
         m1.update(new)
         for f in remove:
             if f in m1:
                 del m1[f]
         mn = self.manifest.add(m1, mf1, tr, linkrev, c1[0], c2[0])
 
         # add changeset
         new = new.keys()
         new.sort()
 
         if not text:
             edittext = "\n" + "HG: manifest hash %s\n" % hex(mn)
             edittext += "".join(["HG: changed %s\n" % f for f in new])
             edittext += "".join(["HG: removed %s\n" % f for f in remove])
             edittext = self.ui.edit(edittext)
             if not edittext.rstrip():
                 return 1
             text = edittext
 
         n = self.changelog.add(mn, new, text, tr, p1, p2, user, date)
 
         if not self.hook("commit", node=hex(n)):
             return 1
 
         tr.close()
 
         self.dirstate.setparents(n)
         self.dirstate.update(new, "n")
         self.dirstate.forget(remove)
 
     def changes(self, node1, node2, files=None):
         mf2, u = None, []
 
         def fcmp(fn, mf):
             t1 = self.wfile(fn).read()
             t2 = self.file(fn).revision(mf[fn])
             return cmp(t1, t2)
 
         # are we comparing the working directory?
         if not node2:
             l, c, a, d, u = self.dirstate.changes(files, self.ignore)
 
             # are we comparing working dir against its parent?
             if not node1:
                 if l:
                     # do a full compare of any files that might have changed
                     change = self.changelog.read(self.dirstate.parents()[0])
                     mf2 = self.manifest.read(change[0])
                     for f in l:
                         if fcmp(f, mf2):
                             c.append(f)
 
                 for l in c, a, d, u:
                     l.sort()
 
                 return (c, a, d, u)
 
         # are we comparing working dir against non-tip?
         # generate a pseudo-manifest for the working dir
         if not node2:
             if not mf2:
                 change = self.changelog.read(self.dirstate.parents()[0])
                 mf2 = self.manifest.read(change[0]).copy()
             for f in a + c + l:
                 mf2[f] = ""
             for f in d:
                 if f in mf2: del mf2[f]
         else:
             change = self.changelog.read(node2)
             mf2 = self.manifest.read(change[0])
 
         # flush lists from dirstate before comparing manifests
         c, a = [], []
 
         change = self.changelog.read(node1)
         mf1 = self.manifest.read(change[0]).copy()
 
         for fn in mf2:
             if mf1.has_key(fn):
                 if mf1[fn] != mf2[fn]:
                     if mf2[fn] != "" or fcmp(fn, mf1):
                         c.append(fn)
                 del mf1[fn]
             else:
                 a.append(fn)
 
         d = mf1.keys()
 
         for l in c, a, d, u:
             l.sort()
 
         return (c, a, d, u)
 
     def add(self, list):
         for f in list:
             p = self.wjoin(f)
             if not os.path.isfile(p):
                 self.ui.warn("%s does not exist!\n" % f)
             elif self.dirstate.state(f) == 'n':
                 self.ui.warn("%s already tracked!\n" % f)
             else:
                 self.dirstate.update([f], "a")
 
     def forget(self, list):
         for f in list:
             if self.dirstate.state(f) not in 'ai':
                 self.ui.warn("%s not added!\n" % f)
             else:
                 self.dirstate.forget([f])
 
     def remove(self, list):
         for f in list:
             p = self.wjoin(f)
             if os.path.isfile(p):
                 self.ui.warn("%s still exists!\n" % f)
             elif self.dirstate.state(f) == 'a':
                 self.ui.warn("%s never committed!\n" % f)
                 self.dirstate.forget(f)
             elif f not in self.dirstate:
                 self.ui.warn("%s not tracked!\n" % f)
             else:
                 self.dirstate.update([f], "r")
 
     def copy(self, source, dest):
         p = self.wjoin(dest)
         if not os.path.isfile(dest):
             self.ui.warn("%s does not exist!\n" % dest)
         else:
             if self.dirstate.state(dest) == '?':
                 self.dirstate.update([dest], "a")
             self.dirstate.copy(source, dest)
 
     def heads(self):
         return self.changelog.heads()
 
     def branches(self, nodes):
         if not nodes: nodes = [self.changelog.tip()]
         b = []
         for n in nodes:
             t = n
             while n:
                 p = self.changelog.parents(n)
                 if p[1] != nullid or p[0] == nullid:
                     b.append((t, n, p[0], p[1]))
                     break
                 n = p[0]
         return b
 
     def between(self, pairs):
         r = []
 
         for top, bottom in pairs:
             n, l, i = top, [], 0
             f = 1
 
             while n != bottom:
                 p = self.changelog.parents(n)[0]
                 if i == f:
                     l.append(n)
                     f = f * 2
                 n = p
                 i += 1
 
             r.append(l)
 
         return r
 
     def newer(self, nodes):
         m = {}
         nl = []
         pm = {}
         cl = self.changelog
         t = l = cl.count()
 
         # find the lowest numbered node
         for n in nodes:
             l = min(l, cl.rev(n))
             m[n] = 1
 
         for i in xrange(l, t):
             n = cl.node(i)
             if n in m: # explicitly listed
                 pm[n] = 1
                 nl.append(n)
                 continue
             for p in cl.parents(n):
                 if p in pm: # parent listed
                     pm[n] = 1
                     nl.append(n)
                     break
 
         return nl
 
     def findincoming(self, remote):
         m = self.changelog.nodemap
         search = []
         fetch = []
         base = {}
         seen = {}
         seenbranch = {}
 
         # if we have an empty repo, fetch everything
         if self.changelog.tip() == nullid:
             self.ui.status("requesting all changes\n")
             return [nullid]
 
         # otherwise, assume we're closer to the tip than the root
         # and start by examining the heads
         self.ui.status("searching for changes\n")
         heads = remote.heads()
         unknown = []
         for h in heads:
             if h not in m:
                 unknown.append(h)
 
         if not unknown:
             return None
 
         rep = {}
         reqcnt = 0
 
         # search through remote branches
         # a 'branch' here is a linear segment of history, with four parts:
         # head, root, first parent, second parent
         # (a branch always has two parents (or none) by definition)
         unknown = remote.branches(unknown)
         while unknown:
             r = []
             while unknown:
                 n = unknown.pop(0)
                 if n[0] in seen:
                     continue
 
                 self.ui.debug("examining %s:%s\n" % (short(n[0]), short(n[1])))
                 if n[0] == nullid:
                     break
                 if n in seenbranch:
                     self.ui.debug("branch already found\n")
                     continue
                 if n[1] and n[1] in m: # do we know the base?
                     self.ui.debug("found incomplete branch %s:%s\n"
                                   % (short(n[0]), short(n[1])))
                     search.append(n) # schedule branch range for scanning
                     seenbranch[n] = 1
                 else:
                     if n[1] not in seen and n[1] not in fetch:
                         if n[2] in m and n[3] in m:
                             self.ui.debug("found new changeset %s\n" %
                                           short(n[1]))
                             fetch.append(n[1]) # earliest unknown
                             base[n[2]] = 1 # latest known
                             continue
 
                     for a in n[2:4]:
                         if a not in rep:
                             r.append(a)
                             rep[a] = 1
 
                 seen[n[0]] = 1
 
             if r:
                 reqcnt += 1
                 self.ui.debug("request %d: %s\n" %
                             (reqcnt, " ".join(map(short, r))))
                 for p in range(0, len(r), 10):
                     for b in remote.branches(r[p:p+10]):
                         self.ui.debug("received %s:%s\n" %
                                       (short(b[0]), short(b[1])))
                         if b[0] not in m and b[0] not in seen:
                             unknown.append(b)
 
         # do binary search on the branches we found
         while search:
             n = search.pop(0)
             reqcnt += 1
             l = remote.between([(n[0], n[1])])[0]
             l.append(n[1])
             p = n[0]
             f = 1
             for i in l:
                 self.ui.debug("narrowing %d:%d %s\n" % (f, len(l), short(i)))
                 if i in m:
                     if f <= 2:
                         self.ui.debug("found new branch changeset %s\n" %
                                           short(p))
                         fetch.append(p)
                         base[i] = 1
                     else:
                         self.ui.debug("narrowed branch search to %s:%s\n"
                                       % (short(p), short(i)))
                         search.append((p, i))
                     break
                 p, f = i, f * 2
 
         # sanity check our fetch list
         for f in fetch:
             if f in m:
                 raise RepoError("already have changeset " + short(f[:4]))
 
         if base.keys() == [nullid]:
             self.ui.warn("warning: pulling from an unrelated repository!\n")
 
         self.ui.note("adding new changesets starting at " +
                      " ".join([short(f) for f in fetch]) + "\n")
 
         self.ui.debug("%d total queries\n" % reqcnt)
 
         return fetch
 
     def changegroup(self, basenodes):
         nodes = self.newer(basenodes)
 
         # construct the link map
         linkmap = {}
         for n in nodes:
             linkmap[self.changelog.rev(n)] = n
 
         # construct a list of all changed files
         changed = {}
         for n in nodes:
             c = self.changelog.read(n)
             for f in c[3]:
                 changed[f] = 1
         changed = changed.keys()
         changed.sort()
 
         # the changegroup is changesets + manifests + all file revs
         revs = [ self.changelog.rev(n) for n in nodes ]
 
         for y in self.changelog.group(linkmap): yield y
         for y in self.manifest.group(linkmap): yield y
         for f in changed:
             yield struct.pack(">l", len(f) + 4) + f
             g = self.file(f).group(linkmap)
             for y in g:
                 yield y
 
     def addchangegroup(self, generator):
 
         class genread:
             def __init__(self, generator):
                 self.g = generator
                 self.buf = ""
             def read(self, l):
                 while l > len(self.buf):
                     try:
                         self.buf += self.g.next()
                     except StopIteration:
                         break
                 d, self.buf = self.buf[:l], self.buf[l:]
                 return d
 
         def getchunk():
             d = source.read(4)
             if not d: return ""
             l = struct.unpack(">l", d)[0]
             if l <= 4: return ""
             return source.read(l - 4)
 
         def getgroup():
             while 1:
                 c = getchunk()
                 if not c: break
                 yield c
 
         def csmap(x):
             self.ui.debug("add changeset %s\n" % short(x))
             return self.changelog.count()
 
         def revmap(x):
             return self.changelog.rev(x)
 
         if not generator: return
         changesets = files = revisions = 0
 
         source = genread(generator)
         lock = self.lock()
         tr = self.transaction()
 
         # pull off the changeset group
         self.ui.status("adding changesets\n")
         co = self.changelog.tip()
         cn = self.changelog.addgroup(getgroup(), csmap, tr, 1) # unique
         changesets = self.changelog.rev(cn) - self.changelog.rev(co)
 
         # pull off the manifest group
         self.ui.status("adding manifests\n")
         mm = self.manifest.tip()
         mo = self.manifest.addgroup(getgroup(), revmap, tr)
 
         # process the files
         self.ui.status("adding file revisions\n")
         while 1:
             f = getchunk()
             if not f: break
             self.ui.debug("adding %s revisions\n" % f)
             fl = self.file(f)
             o = fl.count()
             n = fl.addgroup(getgroup(), revmap, tr)
             revisions += fl.count() - o
             files += 1
 
         self.ui.status(("modified %d files, added %d changesets" +
                         " and %d new revisions\n")
                        % (files, changesets, revisions))
 
         tr.close()
         return
 
-    def update(self, node, allow=False, force=False):
+    def update(self, node, allow=False, force=False, choose=None,
+               moddirstate=True):
         pl = self.dirstate.parents()
         if not force and pl[1] != nullid:
             self.ui.warn("aborting: outstanding uncommitted merges\n")
             return
 
         p1, p2 = pl[0], node
         pa = self.changelog.ancestor(p1, p2)
         m1n = self.changelog.read(p1)[0]
         m2n = self.changelog.read(p2)[0]
         man = self.manifest.ancestor(m1n, m2n)
         m1 = self.manifest.read(m1n)
         mf1 = self.manifest.readflags(m1n)
         m2 = self.manifest.read(m2n)
         mf2 = self.manifest.readflags(m2n)
         ma = self.manifest.read(man)
         mfa = self.manifest.readflags(man)
 
         (c, a, d, u) = self.changes(None, None)
 
         # is this a jump, or a merge?  i.e. is there a linear path
         # from p1 to p2?
         linear_path = (pa == p1 or pa == p2)
 
         # resolve the manifest to determine which files
         # we care about merging
         self.ui.note("resolving manifests\n")
         self.ui.debug(" ancestor %s local %s remote %s\n" %
                       (short(man), short(m1n), short(m2n)))
 
         merge = {}
         get = {}
         remove = []
         mark = {}
 
         # construct a working dir manifest
         mw = m1.copy()
         mfw = mf1.copy()
         umap = dict.fromkeys(u)
 
         for f in a + c + u:
             mw[f] = ""
             mfw[f] = util.is_exec(self.wjoin(f), mfw.get(f, False))
 
         for f in d:
             if f in mw: del mw[f]
 
             # If we're jumping between revisions (as opposed to merging),
             # and if neither the working directory nor the target rev has
             # the file, then we need to remove it from the dirstate, to
             # prevent the dirstate from listing the file when it is no
             # longer in the manifest.
-            if linear_path and f not in m2:
+            if moddirstate and linear_path and f not in m2:
                 self.dirstate.forget((f,))
 
         # Compare manifests
         for f, n in mw.iteritems():
+            if choose and not choose(f): continue
             if f in m2:
                 s = 0
 
                 # is the wfile new since m1, and match m2?
                 if f not in m1:
                     t1 = self.wfile(f).read()
                     t2 = self.file(f).revision(m2[f])
                     if cmp(t1, t2) == 0:
                         mark[f] = 1
                         n = m2[f]
                     del t1, t2
 
                 # are files different?
                 if n != m2[f]:
                     a = ma.get(f, nullid)
                     # are both different from the ancestor?
                     if n != a and m2[f] != a:
                         self.ui.debug(" %s versions differ, resolve\n" % f)
                         # merge executable bits
                         # "if we changed or they changed, change in merge"
                         a, b, c = mfa.get(f, 0), mfw[f], mf2[f]
                         mode = ((a^b) | (a^c)) ^ a
                         merge[f] = (m1.get(f, nullid), m2[f], mode)
                         s = 1
                     # are we clobbering?
                     # is remote's version newer?
                     # or are we going back in time?
                     elif force or m2[f] != a or (p2 == pa and mw[f] == m1[f]):
                         self.ui.debug(" remote %s is newer, get\n" % f)
                         get[f] = m2[f]
                         s = 1
                     else:
                         mark[f] = 1
                 elif f in umap:
                     # this unknown file is the same as the checkout
                     get[f] = m2[f]
 
                 if not s and mfw[f] != mf2[f]:
                     if force:
                         self.ui.debug(" updating permissions for %s\n" % f)
                         util.set_exec(self.wjoin(f), mf2[f])
                     else:
                         a, b, c = mfa.get(f, 0), mfw[f], mf2[f]
                         mode = ((a^b) | (a^c)) ^ a
                         if mode != b:
                             self.ui.debug(" updating permissions for %s\n" % f)
                             util.set_exec(self.wjoin(f), mode)
                             mark[f] = 1
                 del m2[f]
             elif f in ma:
                 if not force and n != ma[f]:
                     r = ""
                     if linear_path or allow:
                         r = self.ui.prompt(
                             (" local changed %s which remote deleted\n" % f) +
                             "(k)eep or (d)elete?", "[kd]", "k")
                     if r == "d":
                         remove.append(f)
                 else:
                     self.ui.debug("other deleted %s\n" % f)
                     remove.append(f) # other deleted it
             else:
                 if n == m1.get(f, nullid): # same as parent
                     if p2 == pa: # going backwards?
                         self.ui.debug("remote deleted %s\n" % f)
                         remove.append(f)
                     else:
                         self.ui.debug("local created %s, keeping\n" % f)
                 else:
                     self.ui.debug("working dir created %s, keeping\n" % f)
 
         for f, n in m2.iteritems():
+            if choose and not choose(f): continue
             if f[0] == "/": continue
             if not force and f in ma and n != ma[f]:
                 r = ""
                 if linear_path or allow:
                     r = self.ui.prompt(
                         ("remote changed %s which local deleted\n" % f) +
                         "(k)eep or (d)elete?", "[kd]", "k")
                 if r == "d": remove.append(f)
             else:
                 self.ui.debug("remote created %s\n" % f)
                 get[f] = n
 
         del mw, m1, m2, ma
 
         if force:
             for f in merge:
                 get[f] = merge[f][1]
             merge = {}
 
         if linear_path:
             # we don't need to do any magic, just jump to the new rev
             mode = 'n'
             p1, p2 = p2, nullid
         else:
             if not allow:
                 self.ui.status("this update spans a branch" +
                                " affecting the following files:\n")
                 fl = merge.keys() + get.keys()
                 fl.sort()
                 for f in fl:
                     cf = ""
                     if f in merge: cf = " (resolve)"
                     self.ui.status(" %s%s\n" % (f, cf))
                 self.ui.warn("aborting update spanning branches!\n")
                 self.ui.status("(use update -m to perform a branch merge)\n")
                 return 1
             # we have to remember what files we needed to get/change
             # because any file that's different from either one of its
             # parents must be in the changeset
             mode = 'm'
-            self.dirstate.update(mark.keys(), "m")
+            if moddirstate:
+                self.dirstate.update(mark.keys(), "m")
 
-        self.dirstate.setparents(p1, p2)
+        if moddirstate:
+            self.dirstate.setparents(p1, p2)
 
         # get the files we don't need to change
         files = get.keys()
         files.sort()
         for f in files:
             if f[0] == "/": continue
             self.ui.note("getting %s\n" % f)
             t = self.file(f).read(get[f])
             try:
                 self.wfile(f, "w").write(t)
             except IOError:
                 os.makedirs(os.path.dirname(self.wjoin(f)))
                 self.wfile(f, "w").write(t)
             util.set_exec(self.wjoin(f), mf2[f])
-            self.dirstate.update([f], mode)
+            if moddirstate:
+                self.dirstate.update([f], mode)
 
         # merge the tricky bits
         files = merge.keys()
         files.sort()
         for f in files:
             self.ui.status("merging %s\n" % f)
             m, o, flag = merge[f]
             self.merge3(f, m, o)
             util.set_exec(self.wjoin(f), flag)
-            self.dirstate.update([f], 'm')
+            if moddirstate:
+                self.dirstate.update([f], 'm')
 
         for f in remove:
             self.ui.note("removing %s\n" % f)
             os.unlink(f)
             # try removing directories that might now be empty
             try: os.removedirs(os.path.dirname(f))
             except: pass
-        if mode == 'n':
-            self.dirstate.forget(remove)
-        else:
-            self.dirstate.update(remove, 'r')
+        if moddirstate:
+            if mode == 'n':
+                self.dirstate.forget(remove)
+            else:
+                self.dirstate.update(remove, 'r')
 
     def merge3(self, fn, my, other):
         """perform a 3-way merge in the working directory"""
 
         def temp(prefix, node):
             pre = "%s~%s." % (os.path.basename(fn), prefix)
             (fd, name) = tempfile.mkstemp("", pre)
             f = os.fdopen(fd, "wb")
             f.write(fl.revision(node))
             f.close()
             return name
 
         fl = self.file(fn)
         base = fl.ancestor(my, other)
         a = self.wjoin(fn)
         b = temp("base", base)
         c = temp("other", other)
 
         self.ui.note("resolving %s\n" % fn)
         self.ui.debug("file %s: other %s ancestor %s\n" %
                               (fn, short(other), short(base)))
 
         cmd = os.environ.get("HGMERGE", "hgmerge")
         r = os.system("%s %s %s %s" % (cmd, a, b, c))
         if r:
             self.ui.warn("merging %s failed!\n" % fn)
 
         os.unlink(b)
         os.unlink(c)
 
     def verify(self):
         filelinkrevs = {}
         filenodes = {}
         changesets = revisions = files = 0
         errors = 0
 
         seen = {}
         self.ui.status("checking changesets\n")
         for i in range(self.changelog.count()):
             changesets += 1
             n = self.changelog.node(i)
             if n in seen:
                 self.ui.warn("duplicate changeset at revision %d\n" % i)
                 errors += 1
             seen[n] = 1
 
             for p in self.changelog.parents(n):
                 if p not in self.changelog.nodemap:
                     self.ui.warn("changeset %s has unknown parent %s\n" %
                                  (short(n), short(p)))
                     errors += 1
             try:
                 changes = self.changelog.read(n)
             except Exception, inst:
                 self.ui.warn("unpacking changeset %s: %s\n" % (short(n), inst))
                 errors += 1
 
             for f in changes[3]:
                 filelinkrevs.setdefault(f, []).append(i)
 
         seen = {}
         self.ui.status("checking manifests\n")
         for i in range(self.manifest.count()):
             n = self.manifest.node(i)
             if n in seen:
                 self.ui.warn("duplicate manifest at revision %d\n" % i)
                 errors += 1
             seen[n] = 1
 
             for p in self.manifest.parents(n):
                 if p not in self.manifest.nodemap:
                     self.ui.warn("manifest %s has unknown parent %s\n" %
                             (short(n), short(p)))
                     errors += 1
 
             try:
                 delta = mdiff.patchtext(self.manifest.delta(n))
             except KeyboardInterrupt:
                 self.ui.warn("aborted")
                 sys.exit(0)
             except Exception, inst:
                 self.ui.warn("unpacking manifest %s: %s\n"
                              % (short(n), inst))
                 errors += 1
 
             ff = [ l.split('\0') for l in delta.splitlines() ]
             for f, fn in ff:
                 filenodes.setdefault(f, {})[bin(fn[:40])] = 1
 
         self.ui.status("crosschecking files in changesets and manifests\n")
         for f in filenodes:
             if f not in filelinkrevs:
                 self.ui.warn("file %s in manifest but not in changesets\n" % f)
                 errors += 1
 
         for f in filelinkrevs:
             if f not in filenodes:
                 self.ui.warn("file %s in changeset but not in manifest\n" % f)
                 errors += 1
 
         self.ui.status("checking files\n")
         ff = filenodes.keys()
         ff.sort()
         for f in ff:
             if f == "/dev/null": continue
             files += 1
             fl = self.file(f)
             nodes = { nullid: 1 }
             seen = {}
             for i in range(fl.count()):
                 revisions += 1
                 n = fl.node(i)
 
                 if n in seen:
                     self.ui.warn("%s: duplicate revision %d\n" % (f, i))
                     errors += 1
 
                 if n not in filenodes[f]:
                     self.ui.warn("%s: %d:%s not in manifests\n"
                                  % (f, i, short(n)))
                     errors += 1
                 else:
                     del filenodes[f][n]
 
                 flr = fl.linkrev(n)
                 if flr not in filelinkrevs[f]:
                     self.ui.warn("%s:%s points to unexpected changeset %d\n"
                             % (f, short(n), fl.linkrev(n)))
                     errors += 1
                 else:
                     filelinkrevs[f].remove(flr)
 
                 # verify contents
                 try:
                     t = fl.read(n)
                 except Exception, inst:
                     self.ui.warn("unpacking file %s %s: %s\n"
                                  % (f, short(n), inst))
                     errors += 1
 
                 # verify parents
                 (p1, p2) = fl.parents(n)
                 if p1 not in nodes:
                     self.ui.warn("file %s:%s unknown parent 1 %s" %
                             (f, short(n), short(p1)))
                     errors += 1
                 if p2 not in nodes:
                     self.ui.warn("file %s:%s unknown parent 2 %s" %
                             (f, short(n), short(p1)))
                     errors += 1
                 nodes[n] = 1
 
             # cross-check
             for node in filenodes[f]:
                 self.ui.warn("node %s in manifests not in %s\n"
                              % (hex(n), f))
                 errors += 1
 
         self.ui.status("%d files, %d changesets, %d total revisions\n" %
                        (files, changesets, revisions))
 
         if errors:
             self.ui.warn("%d integrity errors encountered!\n" % errors)
             return 1
 
 class remoterepository:
     def __init__(self, ui, path):
         self.url = path
         self.ui = ui
         no_list = [ "localhost", "127.0.0.1" ]
         host = ui.config("http_proxy", "host")
         if host is None:
             host = os.environ.get("http_proxy")
         if host and host.startswith('http://'):
             host = host[7:]
         user = ui.config("http_proxy", "user")
         passwd = ui.config("http_proxy", "passwd")
         no = ui.config("http_proxy", "no")
         if no is None:
             no = os.environ.get("no_proxy")
         if no:
             no_list = no_list + no.split(",")
 
         no_proxy = 0
         for h in no_list:
             if (path.startswith("http://" + h + "/") or
                 path.startswith("http://" + h + ":") or
                 path == "http://" + h):
                 no_proxy = 1
 
         # Note: urllib2 takes proxy values from the environment and those will
         # take precedence
         for env in ["HTTP_PROXY", "http_proxy", "no_proxy"]:
             if os.environ.has_key(env):
                 del os.environ[env]
 
         proxy_handler = urllib2.BaseHandler()
         if host and not no_proxy:
             proxy_handler = urllib2.ProxyHandler({"http" : "http://" + host})
 
         authinfo = None
         if user and passwd:
             passmgr = urllib2.HTTPPasswordMgrWithDefaultRealm()
             passmgr.add_password(None, host, user, passwd)
             authinfo = urllib2.ProxyBasicAuthHandler(passmgr)
 
         opener = urllib2.build_opener(proxy_handler, authinfo)
         urllib2.install_opener(opener)
 
     def do_cmd(self, cmd, **args):
         self.ui.debug("sending %s command\n" % cmd)
         q = {"cmd": cmd}
         q.update(args)
         qs = urllib.urlencode(q)
         cu = "%s?%s" % (self.url, qs)
         return urllib2.urlopen(cu)
 
     def heads(self):
         d = self.do_cmd("heads").read()
         try:
             return map(bin, d[:-1].split(" "))
         except:
             self.ui.warn("unexpected response:\n" + d[:400] + "\n...\n")
             raise
 
     def branches(self, nodes):
         n = " ".join(map(hex, nodes))
         d = self.do_cmd("branches", nodes=n).read()
         try:
             br = [ tuple(map(bin, b.split(" "))) for b in d.splitlines() ]
             return br
         except:
             self.ui.warn("unexpected response:\n" + d[:400] + "\n...\n")
             raise
 
     def between(self, pairs):
         n = "\n".join(["-".join(map(hex, p)) for p in pairs])
         d = self.do_cmd("between", pairs=n).read()
         try:
             p = [ l and map(bin, l.split(" ")) or [] for l in d.splitlines() ]
             return p
         except:
             self.ui.warn("unexpected response:\n" + d[:400] + "\n...\n")
             raise
 
     def changegroup(self, nodes):
         n = " ".join(map(hex, nodes))
         zd = zlib.decompressobj()
         f = self.do_cmd("changegroup", roots=n)
         bytes = 0
         while 1:
             d = f.read(4096)
             bytes += len(d)
             if not d:
                 yield zd.flush()
                 break
             yield zd.decompress(d)
         self.ui.note("%d bytes of data transfered\n" % bytes)
 
 def repository(ui, path=None, create=0):
     if path and path[:7] == "http://":
         return remoterepository(ui, path)
     if path and path[:5] == "hg://":
         return remoterepository(ui, path.replace("hg://", "http://"))
     if path and path[:11] == "old-http://":
         return localrepository(ui, path.replace("old-http://", "http://"))
     else:
         return localrepository(ui, path, create)
 

tests/test-help.out

@@ -1,88 +1,90 b''
 + hg -q help
 hg commands:
 
  add         add the specified files on the next commit
  addremove   add all new files, delete all missing files
  annotate    show changeset information per file line
  cat         output the latest or given revision of a file
  clone       make a copy of an existing repository
  commit      commit the specified files or all outstanding changes
  copy        mark a file as copied or renamed for the next commit
  diff        diff working directory (or selected files)
  export      dump the header and diffs for one or more changesets
  forget      don't add the specified files on the next commit
  heads       show current repository heads
  help        show help for a given command or all commands
  identify    print information about the working copy
  import      import an ordered set of patches
  init        create a new repository in the current directory
  log         show the revision history of the repository or a single file
  manifest    output the latest or given revision of the project manifest
  parents     show the parents of the current working dir
  pull        pull changes from the specified source
  push        push changes to the specified destination
  rawcommit   raw commit interface
  recover     roll back an interrupted transaction
  remove      remove the specified files on the next commit
+ revert      revert modified files or dirs back to their unmodified states
  root        print the root (top) of the current working dir
  serve       export the repository via HTTP
  status      show changed files in the working directory
  tag         add a tag for the current tip or a given revision
  tags        list repository tags
  tip         show the tip revision
  undo        undo the last transaction
  update      update or merge working directory
  verify      verify the integrity of the repository
  version     output version and copyright information
 + hg add -h
 hg add: option -h not recognized
 hg add [files]
 
 add the specified files on the next commit
 + hg help diff
 hg diff [-r A] [-r B] [files]
 
  -r --rev 
    revision
 
 diff working directory (or selected files)
 + hg help foo
 hg: unknown command foo
 + hg -q commands
 hg: unknown command 'commands'
 hg commands:
 
  add         add the specified files on the next commit
  addremove   add all new files, delete all missing files
  annotate    show changeset information per file line
  cat         output the latest or given revision of a file
  clone       make a copy of an existing repository
  commit      commit the specified files or all outstanding changes
  copy        mark a file as copied or renamed for the next commit
  diff        diff working directory (or selected files)
  export      dump the header and diffs for one or more changesets
  forget      don't add the specified files on the next commit
  heads       show current repository heads
  help        show help for a given command or all commands
  identify    print information about the working copy
  import      import an ordered set of patches
  init        create a new repository in the current directory
  log         show the revision history of the repository or a single file
  manifest    output the latest or given revision of the project manifest
  parents     show the parents of the current working dir
  pull        pull changes from the specified source
  push        push changes to the specified destination
  rawcommit   raw commit interface
  recover     roll back an interrupted transaction
  remove      remove the specified files on the next commit
+ revert      revert modified files or dirs back to their unmodified states
  root        print the root (top) of the current working dir
  serve       export the repository via HTTP
  status      show changed files in the working directory
  tag         add a tag for the current tip or a given revision
  tags        list repository tags
  tip         show the tip revision
  undo        undo the last transaction
  update      update or merge working directory
  verify      verify the integrity of the repository
  version     output version and copyright information
 + exit 0