journal: use changesetformatter to properly nest list of commits in JSON

Before, two separate JSON documents were interleaved.

I chose the field name "changesets" over the option name "commits", since
each entry is called a "changeset" in log templates.

hgext/journal.py

@@ -1,523 +1,527 b''
 # journal.py
 #
 # Copyright 2014-2016 Facebook, Inc.
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 """track previous positions of bookmarks (EXPERIMENTAL)
 
 This extension adds a new command: `hg journal`, which shows you where
 bookmarks were previously located.
 
 """
 
 from __future__ import absolute_import
 
 import collections
 import errno
 import os
 import weakref
 
 from mercurial.i18n import _
 
 from mercurial import (
     bookmarks,
     cmdutil,
     dispatch,
     encoding,
     error,
     extensions,
     hg,
     localrepo,
     lock,
     logcmdutil,
     node,
     pycompat,
     registrar,
     util,
 )
 from mercurial.utils import (
     dateutil,
     procutil,
     stringutil,
 )
 
 cmdtable = {}
 command = registrar.command(cmdtable)
 
 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
 testedwith = 'ships-with-hg-core'
 
 # storage format version; increment when the format changes
 storageversion = 0
 
 # namespaces
 bookmarktype = 'bookmark'
 wdirparenttype = 'wdirparent'
 # In a shared repository, what shared feature name is used
 # to indicate this namespace is shared with the source?
 sharednamespaces = {
     bookmarktype: hg.sharedbookmarks,
 }
 
 # Journal recording, register hooks and storage object
 def extsetup(ui):
     extensions.wrapfunction(dispatch, 'runcommand', runcommand)
     extensions.wrapfunction(bookmarks.bmstore, '_write', recordbookmarks)
     extensions.wrapfilecache(
         localrepo.localrepository, 'dirstate', wrapdirstate)
     extensions.wrapfunction(hg, 'postshare', wrappostshare)
     extensions.wrapfunction(hg, 'copystore', unsharejournal)
 
 def reposetup(ui, repo):
     if repo.local():
         repo.journal = journalstorage(repo)
         repo._wlockfreeprefix.add('namejournal')
 
         dirstate, cached = localrepo.isfilecached(repo, 'dirstate')
         if cached:
             # already instantiated dirstate isn't yet marked as
             # "journal"-ing, even though repo.dirstate() was already
             # wrapped by own wrapdirstate()
             _setupdirstate(repo, dirstate)
 
 def runcommand(orig, lui, repo, cmd, fullargs, *args):
     """Track the command line options for recording in the journal"""
     journalstorage.recordcommand(*fullargs)
     return orig(lui, repo, cmd, fullargs, *args)
 
 def _setupdirstate(repo, dirstate):
     dirstate.journalstorage = repo.journal
     dirstate.addparentchangecallback('journal', recorddirstateparents)
 
 # hooks to record dirstate changes
 def wrapdirstate(orig, repo):
     """Make journal storage available to the dirstate object"""
     dirstate = orig(repo)
     if util.safehasattr(repo, 'journal'):
         _setupdirstate(repo, dirstate)
     return dirstate
 
 def recorddirstateparents(dirstate, old, new):
     """Records all dirstate parent changes in the journal."""
     old = list(old)
     new = list(new)
     if util.safehasattr(dirstate, 'journalstorage'):
         # only record two hashes if there was a merge
         oldhashes = old[:1] if old[1] == node.nullid else old
         newhashes = new[:1] if new[1] == node.nullid else new
         dirstate.journalstorage.record(
             wdirparenttype, '.', oldhashes, newhashes)
 
 # hooks to record bookmark changes (both local and remote)
 def recordbookmarks(orig, store, fp):
     """Records all bookmark changes in the journal."""
     repo = store._repo
     if util.safehasattr(repo, 'journal'):
         oldmarks = bookmarks.bmstore(repo)
         for mark, value in store.iteritems():
             oldvalue = oldmarks.get(mark, node.nullid)
             if value != oldvalue:
                 repo.journal.record(bookmarktype, mark, oldvalue, value)
     return orig(store, fp)
 
 # shared repository support
 def _readsharedfeatures(repo):
     """A set of shared features for this repository"""
     try:
         return set(repo.vfs.read('shared').splitlines())
     except IOError as inst:
         if inst.errno != errno.ENOENT:
             raise
         return set()
 
 def _mergeentriesiter(*iterables, **kwargs):
     """Given a set of sorted iterables, yield the next entry in merged order
 
     Note that by default entries go from most recent to oldest.
     """
     order = kwargs.pop(r'order', max)
     iterables = [iter(it) for it in iterables]
     # this tracks still active iterables; iterables are deleted as they are
     # exhausted, which is why this is a dictionary and why each entry also
     # stores the key. Entries are mutable so we can store the next value each
     # time.
     iterable_map = {}
     for key, it in enumerate(iterables):
         try:
             iterable_map[key] = [next(it), key, it]
         except StopIteration:
             # empty entry, can be ignored
             pass
 
     while iterable_map:
         value, key, it = order(iterable_map.itervalues())
         yield value
         try:
             iterable_map[key][0] = next(it)
         except StopIteration:
             # this iterable is empty, remove it from consideration
             del iterable_map[key]
 
 def wrappostshare(orig, sourcerepo, destrepo, **kwargs):
     """Mark this shared working copy as sharing journal information"""
     with destrepo.wlock():
         orig(sourcerepo, destrepo, **kwargs)
         with destrepo.vfs('shared', 'a') as fp:
             fp.write('journal\n')
 
 def unsharejournal(orig, ui, repo, repopath):
     """Copy shared journal entries into this repo when unsharing"""
     if (repo.path == repopath and repo.shared() and
             util.safehasattr(repo, 'journal')):
         sharedrepo = hg.sharedreposource(repo)
         sharedfeatures = _readsharedfeatures(repo)
         if sharedrepo and sharedfeatures > {'journal'}:
             # there is a shared repository and there are shared journal entries
             # to copy. move shared date over from source to destination but
             # move the local file first
             if repo.vfs.exists('namejournal'):
                 journalpath = repo.vfs.join('namejournal')
                 util.rename(journalpath, journalpath + '.bak')
             storage = repo.journal
             local = storage._open(
                 repo.vfs, filename='namejournal.bak', _newestfirst=False)
             shared = (
                 e for e in storage._open(sharedrepo.vfs, _newestfirst=False)
                 if sharednamespaces.get(e.namespace) in sharedfeatures)
             for entry in _mergeentriesiter(local, shared, order=min):
                 storage._write(repo.vfs, entry)
 
     return orig(ui, repo, repopath)
 
 class journalentry(collections.namedtuple(
         u'journalentry',
         u'timestamp user command namespace name oldhashes newhashes')):
     """Individual journal entry
 
     * timestamp: a mercurial (time, timezone) tuple
     * user: the username that ran the command
     * namespace: the entry namespace, an opaque string
     * name: the name of the changed item, opaque string with meaning in the
       namespace
     * command: the hg command that triggered this record
     * oldhashes: a tuple of one or more binary hashes for the old location
     * newhashes: a tuple of one or more binary hashes for the new location
 
     Handles serialisation from and to the storage format. Fields are
     separated by newlines, hashes are written out in hex separated by commas,
     timestamp and timezone are separated by a space.
 
     """
     @classmethod
     def fromstorage(cls, line):
         (time, user, command, namespace, name,
          oldhashes, newhashes) = line.split('\n')
         timestamp, tz = time.split()
         timestamp, tz = float(timestamp), int(tz)
         oldhashes = tuple(node.bin(hash) for hash in oldhashes.split(','))
         newhashes = tuple(node.bin(hash) for hash in newhashes.split(','))
         return cls(
             (timestamp, tz), user, command, namespace, name,
             oldhashes, newhashes)
 
     def __bytes__(self):
         """bytes representation for storage"""
         time = ' '.join(map(pycompat.bytestr, self.timestamp))
         oldhashes = ','.join([node.hex(hash) for hash in self.oldhashes])
         newhashes = ','.join([node.hex(hash) for hash in self.newhashes])
         return '\n'.join((
             time, self.user, self.command, self.namespace, self.name,
             oldhashes, newhashes))
 
     __str__ = encoding.strmethod(__bytes__)
 
 class journalstorage(object):
     """Storage for journal entries
 
     Entries are divided over two files; one with entries that pertain to the
     local working copy *only*, and one with entries that are shared across
     multiple working copies when shared using the share extension.
 
     Entries are stored with NUL bytes as separators. See the journalentry
     class for the per-entry structure.
 
     The file format starts with an integer version, delimited by a NUL.
 
     This storage uses a dedicated lock; this makes it easier to avoid issues
     with adding entries that added when the regular wlock is unlocked (e.g.
     the dirstate).
 
     """
     _currentcommand = ()
     _lockref = None
 
     def __init__(self, repo):
         self.user = procutil.getuser()
         self.ui = repo.ui
         self.vfs = repo.vfs
 
         # is this working copy using a shared storage?
         self.sharedfeatures = self.sharedvfs = None
         if repo.shared():
             features = _readsharedfeatures(repo)
             sharedrepo = hg.sharedreposource(repo)
             if sharedrepo is not None and 'journal' in features:
                 self.sharedvfs = sharedrepo.vfs
                 self.sharedfeatures = features
 
     # track the current command for recording in journal entries
     @property
     def command(self):
         commandstr = ' '.join(
             map(procutil.shellquote, journalstorage._currentcommand))
         if '\n' in commandstr:
             # truncate multi-line commands
             commandstr = commandstr.partition('\n')[0] + ' ...'
         return commandstr
 
     @classmethod
     def recordcommand(cls, *fullargs):
         """Set the current hg arguments, stored with recorded entries"""
         # Set the current command on the class because we may have started
         # with a non-local repo (cloning for example).
         cls._currentcommand = fullargs
 
     def _currentlock(self, lockref):
         """Returns the lock if it's held, or None if it's not.
 
         (This is copied from the localrepo class)
         """
         if lockref is None:
             return None
         l = lockref()
         if l is None or not l.held:
             return None
         return l
 
     def jlock(self, vfs):
         """Create a lock for the journal file"""
         if self._currentlock(self._lockref) is not None:
             raise error.Abort(_('journal lock does not support nesting'))
         desc = _('journal of %s') % vfs.base
         try:
             l = lock.lock(vfs, 'namejournal.lock', 0, desc=desc)
         except error.LockHeld as inst:
             self.ui.warn(
                 _("waiting for lock on %s held by %r\n") % (desc, inst.locker))
             # default to 600 seconds timeout
             l = lock.lock(
                 vfs, 'namejournal.lock',
                 self.ui.configint("ui", "timeout"), desc=desc)
             self.ui.warn(_("got lock after %s seconds\n") % l.delay)
         self._lockref = weakref.ref(l)
         return l
 
     def record(self, namespace, name, oldhashes, newhashes):
         """Record a new journal entry
 
         * namespace: an opaque string; this can be used to filter on the type
           of recorded entries.
         * name: the name defining this entry; for bookmarks, this is the
           bookmark name. Can be filtered on when retrieving entries.
         * oldhashes and newhashes: each a single binary hash, or a list of
           binary hashes. These represent the old and new position of the named
           item.
 
         """
         if not isinstance(oldhashes, list):
             oldhashes = [oldhashes]
         if not isinstance(newhashes, list):
             newhashes = [newhashes]
 
         entry = journalentry(
             dateutil.makedate(), self.user, self.command, namespace, name,
             oldhashes, newhashes)
 
         vfs = self.vfs
         if self.sharedvfs is not None:
             # write to the shared repository if this feature is being
             # shared between working copies.
             if sharednamespaces.get(namespace) in self.sharedfeatures:
                 vfs = self.sharedvfs
 
         self._write(vfs, entry)
 
     def _write(self, vfs, entry):
         with self.jlock(vfs):
             version = None
             # open file in amend mode to ensure it is created if missing
             with vfs('namejournal', mode='a+b') as f:
                 f.seek(0, os.SEEK_SET)
                 # Read just enough bytes to get a version number (up to 2
                 # digits plus separator)
                 version = f.read(3).partition('\0')[0]
                 if version and version != "%d" % storageversion:
                     # different version of the storage. Exit early (and not
                     # write anything) if this is not a version we can handle or
                     # the file is corrupt. In future, perhaps rotate the file
                     # instead?
                     self.ui.warn(
                         _("unsupported journal file version '%s'\n") % version)
                     return
                 if not version:
                     # empty file, write version first
                     f.write(("%d" % storageversion) + '\0')
                 f.seek(0, os.SEEK_END)
                 f.write(bytes(entry) + '\0')
 
     def filtered(self, namespace=None, name=None):
         """Yield all journal entries with the given namespace or name
 
         Both the namespace and the name are optional; if neither is given all
         entries in the journal are produced.
 
         Matching supports regular expressions by using the `re:` prefix
         (use `literal:` to match names or namespaces that start with `re:`)
 
         """
         if namespace is not None:
             namespace = stringutil.stringmatcher(namespace)[-1]
         if name is not None:
             name = stringutil.stringmatcher(name)[-1]
         for entry in self:
             if namespace is not None and not namespace(entry.namespace):
                 continue
             if name is not None and not name(entry.name):
                 continue
             yield entry
 
     def __iter__(self):
         """Iterate over the storage
 
         Yields journalentry instances for each contained journal record.
 
         """
         local = self._open(self.vfs)
 
         if self.sharedvfs is None:
             return local
 
         # iterate over both local and shared entries, but only those
         # shared entries that are among the currently shared features
         shared = (
             e for e in self._open(self.sharedvfs)
             if sharednamespaces.get(e.namespace) in self.sharedfeatures)
         return _mergeentriesiter(local, shared)
 
     def _open(self, vfs, filename='namejournal', _newestfirst=True):
         if not vfs.exists(filename):
             return
 
         with vfs(filename) as f:
             raw = f.read()
 
         lines = raw.split('\0')
         version = lines and lines[0]
         if version != "%d" % storageversion:
             version = version or _('not available')
             raise error.Abort(_("unknown journal file version '%s'") % version)
 
         # Skip the first line, it's a version number. Normally we iterate over
         # these in reverse order to list newest first; only when copying across
         # a shared storage do we forgo reversing.
         lines = lines[1:]
         if _newestfirst:
             lines = reversed(lines)
         for line in lines:
             if not line:
                 continue
             yield journalentry.fromstorage(line)
 
 # journal reading
 # log options that don't make sense for journal
 _ignoreopts = ('no-merges', 'graph')
 @command(
     'journal', [
         ('', 'all', None, 'show history for all names'),
         ('c', 'commits', None, 'show commit metadata'),
     ] + [opt for opt in cmdutil.logopts if opt[1] not in _ignoreopts],
     '[OPTION]... [BOOKMARKNAME]')
 def journal(ui, repo, *args, **opts):
     """show the previous position of bookmarks and the working copy
 
     The journal is used to see the previous commits that bookmarks and the
     working copy pointed to. By default the previous locations for the working
     copy.  Passing a bookmark name will show all the previous positions of
     that bookmark. Use the --all switch to show previous locations for all
     bookmarks and the working copy; each line will then include the bookmark
     name, or '.' for the working copy, as well.
 
     If `name` starts with `re:`, the remainder of the name is treated as
     a regular expression. To match a name that actually starts with `re:`,
     use the prefix `literal:`.
 
     By default hg journal only shows the commit hash and the command that was
     running at that time. -v/--verbose will show the prior hash, the user, and
     the time at which it happened.
 
     Use -c/--commits to output log information on each commit hash; at this
     point you can use the usual `--patch`, `--git`, `--stat` and `--template`
     switches to alter the log output for these.
 
     `hg journal -T json` can be used to produce machine readable output.
 
     """
     opts = pycompat.byteskwargs(opts)
     name = '.'
     if opts.get('all'):
         if args:
             raise error.Abort(
                 _("You can't combine --all and filtering on a name"))
         name = None
     if args:
         name = args[0]
 
     fm = ui.formatter('journal', opts)
     def formatnodes(nodes):
         return fm.formatlist(map(fm.hexfunc, nodes), name='node', sep=',')
 
     if opts.get("template") != "json":
         if name is None:
             displayname = _('the working copy and bookmarks')
         else:
             displayname = "'%s'" % name
         ui.status(_("previous locations of %s:\n") % displayname)
 
     limit = logcmdutil.getlimit(opts)
     entry = None
     ui.pager('journal')
     for count, entry in enumerate(repo.journal.filtered(name=name)):
         if count == limit:
             break
 
         fm.startitem()
         fm.condwrite(ui.verbose, 'oldnodes', '%s -> ',
                      formatnodes(entry.oldhashes))
         fm.write('newnodes', '%s', formatnodes(entry.newhashes))
         fm.condwrite(ui.verbose, 'user', ' %-8s', entry.user)
         fm.condwrite(
             opts.get('all') or name.startswith('re:'),
             'name', '  %-8s', entry.name)
 
         fm.condwrite(ui.verbose, 'date', ' %s',
                      fm.formatdate(entry.timestamp, '%Y-%m-%d %H:%M %1%2'))
         fm.write('command', '  %s\n', entry.command)
 
         if opts.get("commits"):
-            displayer = logcmdutil.changesetdisplayer(ui, repo, opts)
+            if fm.isplain():
+                displayer = logcmdutil.changesetdisplayer(ui, repo, opts)
+            else:
+                displayer = logcmdutil.changesetformatter(
+                    ui, repo, fm.nested('changesets'), diffopts=opts)
             for hash in entry.newhashes:
                 try:
                     ctx = repo[hash]
                     displayer.show(ctx)
                 except error.RepoLookupError as e:
                     fm.plain("%s\n\n" % pycompat.bytestr(e))
             displayer.close()
 
     fm.end()
 
     if entry is None:
         ui.status(_("no recorded locations\n"))

tests/test-journal.t

@@ -1,242 +1,298 b''
 Tests for the journal extension; records bookmark locations.
 
   $ cat >> testmocks.py << EOF
   > # mock out procutil.getuser() and util.makedate() to supply testable values
   > import os
   > from mercurial import util, pycompat
   > from mercurial.utils import dateutil, procutil
   > def mockgetuser():
   >     return b'foobar'
   > 
   > def mockmakedate():
   >     filename = os.path.join(os.environ['TESTTMP'], 'testtime')
   >     try:
   >         with open(filename, 'rb') as timef:
   >             time = float(timef.read()) + 1
   >     except IOError:
   >         time = 0.0
   >     with open(filename, 'wb') as timef:
   >         timef.write(pycompat.bytestr(time))
   >     return (time, 0)
   > 
   > procutil.getuser = mockgetuser
   > dateutil.makedate = mockmakedate
   > EOF
 
   $ cat >> $HGRCPATH << EOF
   > [extensions]
   > journal=
   > testmocks=`pwd`/testmocks.py
   > EOF
 
 Setup repo
 
   $ hg init repo
   $ cd repo
 
 Test empty journal
 
   $ hg journal
   previous locations of '.':
   no recorded locations
   $ hg journal foo
   previous locations of 'foo':
   no recorded locations
 
 Test that working copy changes are tracked
 
   $ echo a > a
   $ hg commit -Aqm a
   $ hg journal
   previous locations of '.':
   cb9a9f314b8b  commit -Aqm a
   $ echo b > a
   $ hg commit -Aqm b
   $ hg journal
   previous locations of '.':
   1e6c11564562  commit -Aqm b
   cb9a9f314b8b  commit -Aqm a
   $ hg up 0
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg journal
   previous locations of '.':
   cb9a9f314b8b  up 0
   1e6c11564562  commit -Aqm b
   cb9a9f314b8b  commit -Aqm a
 
 Test that bookmarks are tracked
 
   $ hg book -r tip bar
   $ hg journal bar
   previous locations of 'bar':
   1e6c11564562  book -r tip bar
   $ hg book -f bar
   $ hg journal bar
   previous locations of 'bar':
   cb9a9f314b8b  book -f bar
   1e6c11564562  book -r tip bar
   $ hg up
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   updating bookmark bar
   $ hg journal bar
   previous locations of 'bar':
   1e6c11564562  up
   cb9a9f314b8b  book -f bar
   1e6c11564562  book -r tip bar
 
 Test that bookmarks and working copy tracking is not mixed
 
   $ hg journal
   previous locations of '.':
   1e6c11564562  up
   cb9a9f314b8b  up 0
   1e6c11564562  commit -Aqm b
   cb9a9f314b8b  commit -Aqm a
 
 Test that you can list all entries as well as limit the list or filter on them
 
   $ hg book -r tip baz
   $ hg journal --all
   previous locations of the working copy and bookmarks:
   1e6c11564562  baz       book -r tip baz
   1e6c11564562  bar       up
   1e6c11564562  .         up
   cb9a9f314b8b  bar       book -f bar
   1e6c11564562  bar       book -r tip bar
   cb9a9f314b8b  .         up 0
   1e6c11564562  .         commit -Aqm b
   cb9a9f314b8b  .         commit -Aqm a
   $ hg journal --limit 2
   previous locations of '.':
   1e6c11564562  up
   cb9a9f314b8b  up 0
   $ hg journal bar
   previous locations of 'bar':
   1e6c11564562  up
   cb9a9f314b8b  book -f bar
   1e6c11564562  book -r tip bar
   $ hg journal foo
   previous locations of 'foo':
   no recorded locations
   $ hg journal .
   previous locations of '.':
   1e6c11564562  up
   cb9a9f314b8b  up 0
   1e6c11564562  commit -Aqm b
   cb9a9f314b8b  commit -Aqm a
   $ hg journal "re:ba."
   previous locations of 're:ba.':
   1e6c11564562  baz       book -r tip baz
   1e6c11564562  bar       up
   cb9a9f314b8b  bar       book -f bar
   1e6c11564562  bar       book -r tip bar
 
 Test that verbose, JSON, template and commit output work
 
   $ hg journal --verbose --all
   previous locations of the working copy and bookmarks:
   000000000000 -> 1e6c11564562 foobar    baz      1970-01-01 00:00 +0000  book -r tip baz
   cb9a9f314b8b -> 1e6c11564562 foobar    bar      1970-01-01 00:00 +0000  up
   cb9a9f314b8b -> 1e6c11564562 foobar    .        1970-01-01 00:00 +0000  up
   1e6c11564562 -> cb9a9f314b8b foobar    bar      1970-01-01 00:00 +0000  book -f bar
   000000000000 -> 1e6c11564562 foobar    bar      1970-01-01 00:00 +0000  book -r tip bar
   1e6c11564562 -> cb9a9f314b8b foobar    .        1970-01-01 00:00 +0000  up 0
   cb9a9f314b8b -> 1e6c11564562 foobar    .        1970-01-01 00:00 +0000  commit -Aqm b
   000000000000 -> cb9a9f314b8b foobar    .        1970-01-01 00:00 +0000  commit -Aqm a
   $ hg journal --verbose -Tjson
   [
    {
     "command": "up",
     "date": [5, 0],
     "name": ".",
     "newnodes": ["1e6c11564562b4ed919baca798bc4338bd299d6a"],
     "oldnodes": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"],
     "user": "foobar"
    },
    {
     "command": "up 0",
     "date": [2, 0],
     "name": ".",
     "newnodes": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"],
     "oldnodes": ["1e6c11564562b4ed919baca798bc4338bd299d6a"],
     "user": "foobar"
    },
    {
     "command": "commit -Aqm b",
     "date": [1, 0],
     "name": ".",
     "newnodes": ["1e6c11564562b4ed919baca798bc4338bd299d6a"],
     "oldnodes": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"],
     "user": "foobar"
    },
    {
     "command": "commit -Aqm a",
     "date": [0, 0],
     "name": ".",
     "newnodes": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"],
     "oldnodes": ["0000000000000000000000000000000000000000"],
     "user": "foobar"
    }
   ]
 
   $ cat <<EOF >> $HGRCPATH
   > [templates]
   > j = "{oldnodes % '{node|upper}'} -> {newnodes % '{node|upper}'}
   >      - user: {user}
   >      - command: {command}
   >      - date: {date|rfc3339date}
   >      - newnodes: {newnodes}
   >      - oldnodes: {oldnodes}
   >      "
   > EOF
   $ hg journal -Tj -l1
   previous locations of '.':
   CB9A9F314B8B07BA71012FCDBC544B5A4D82FF5B -> 1E6C11564562B4ED919BACA798BC4338BD299D6A
   - user: foobar
   - command: up
   - date: 1970-01-01T00:00:05+00:00
   - newnodes: 1e6c11564562b4ed919baca798bc4338bd299d6a
   - oldnodes: cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b
 
   $ hg journal --commit
   previous locations of '.':
   1e6c11564562  up
   changeset:   1:1e6c11564562
   bookmark:    bar
   bookmark:    baz
   tag:         tip
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     b
   
   cb9a9f314b8b  up 0
   changeset:   0:cb9a9f314b8b
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     a
   
   1e6c11564562  commit -Aqm b
   changeset:   1:1e6c11564562
   bookmark:    bar
   bookmark:    baz
   tag:         tip
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     b
   
   cb9a9f314b8b  commit -Aqm a
   changeset:   0:cb9a9f314b8b
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     a
   
 
+  $ hg journal --commit -Tjson
+  [
+   {
+    "changesets": [{"bookmarks": ["bar", "baz"], "branch": "default", "date": [0, 0], "desc": "b", "node": "1e6c11564562b4ed919baca798bc4338bd299d6a", "parents": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"], "phase": "draft", "rev": 1, "tags": ["tip"], "user": "test"}],
+    "command": "up",
+    "date": [5, 0],
+    "name": ".",
+    "newnodes": ["1e6c11564562b4ed919baca798bc4338bd299d6a"],
+    "oldnodes": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"],
+    "user": "foobar"
+   },
+   {
+    "changesets": [{"bookmarks": [], "branch": "default", "date": [0, 0], "desc": "a", "node": "cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b", "parents": ["0000000000000000000000000000000000000000"], "phase": "draft", "rev": 0, "tags": [], "user": "test"}],
+    "command": "up 0",
+    "date": [2, 0],
+    "name": ".",
+    "newnodes": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"],
+    "oldnodes": ["1e6c11564562b4ed919baca798bc4338bd299d6a"],
+    "user": "foobar"
+   },
+   {
+    "changesets": [{"bookmarks": ["bar", "baz"], "branch": "default", "date": [0, 0], "desc": "b", "node": "1e6c11564562b4ed919baca798bc4338bd299d6a", "parents": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"], "phase": "draft", "rev": 1, "tags": ["tip"], "user": "test"}],
+    "command": "commit -Aqm b",
+    "date": [1, 0],
+    "name": ".",
+    "newnodes": ["1e6c11564562b4ed919baca798bc4338bd299d6a"],
+    "oldnodes": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"],
+    "user": "foobar"
+   },
+   {
+    "changesets": [{"bookmarks": [], "branch": "default", "date": [0, 0], "desc": "a", "node": "cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b", "parents": ["0000000000000000000000000000000000000000"], "phase": "draft", "rev": 0, "tags": [], "user": "test"}],
+    "command": "commit -Aqm a",
+    "date": [0, 0],
+    "name": ".",
+    "newnodes": ["cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b"],
+    "oldnodes": ["0000000000000000000000000000000000000000"],
+    "user": "foobar"
+   }
+  ]
+
+  $ hg journal --commit \
+  > -T'command: {command}\n{changesets % " rev: {rev}\n children: {children}\n"}'
+  previous locations of '.':
+  command: up
+   rev: 1
+   children: 
+  command: up 0
+   rev: 0
+   children: 
+  command: commit -Aqm b
+   rev: 1
+   children: 
+  command: commit -Aqm a
+   rev: 0
+   children: 
+
 Test for behaviour on unexpected storage version information
 
   $ printf '42\0' > .hg/namejournal
   $ hg journal
   previous locations of '.':
   abort: unknown journal file version '42'
   [255]
   $ hg book -r tip doomed
   unsupported journal file version '42'