Always show short help when an unknown command is given.

mercurial/commands.py

@@ -287,27 +287,24 b' def show_version(ui):'
 def help_(ui, cmd=None):
     """show help for a given command or all commands"""
     if cmd and cmd != 'shortlist':
-        try:
-            i = find(cmd)
-            ui.write("%s\n\n" % i[2])
+        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")
+        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)
+        ui.write(i[0].__doc__, "\n")
         sys.exit(0)
     else:
         if ui.verbose:
@@ -1401,12 +1398,12 b' def dispatch(args):'
             help_(u, inst.args[0])
         else:
             u.warn("hg: %s\n" % inst.args[1])
-            help_(u)
+            help_(u, 'shortlist')
         sys.exit(-1)
     except UnknownCommand, inst:
         u = ui.ui()
         u.warn("hg: unknown command '%s'\n" % inst.args[0])
-        help_(u)
+        help_(u, 'shortlist')
         sys.exit(1)
 
     if options["time"]:
@@ -1491,5 +1488,8 b' def dispatch(args):'
         u.debug(inst, "\n")
         u.warn("%s: invalid arguments\n" % cmd)
         help_(u, cmd)
+    except UnknownCommand, inst:
+        u.warn("hg: unknown command '%s'\n" % inst.args[0])
+        help_(u, 'shortlist')
 
     sys.exit(-1)

tests/test-help.out

@@ -104,42 +104,40 b' hg diff [-r REV1 [-r REV2]] [FILE]...'
 
 diff working directory (or selected files)
 + hg help foo
-hg: unknown command foo
+hg: unknown command 'foo'
+basic hg commands (use "hg help" for more):
+
+ add        add the specified files on the next commit
+ annotate   show changeset information per file line
+ clone      make a copy of an existing repository
+ commit     commit the specified files or all outstanding changes
+ diff       diff working directory (or selected files)
+ export     dump the header and diffs for one or more changesets
+ init       create a new repository in the current directory
+ log        show the revision history of the repository or a single file
+ pull       pull changes from the specified source
+ push       push changes to the specified destination
+ remove     remove the specified files on the next commit
+ revert     revert modified files or dirs back to their unmodified states
+ serve      export the repository via HTTP
+ status     show changed files in the working directory
+ update     update or merge working directory
 + hg -q commands
 hg: unknown command '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
- locate      locate files matching specific patterns
- 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 working dir or revision
- paths       show path or list of available paths
- 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 commit or pull
- update      update or merge working directory
- verify      verify the integrity of the repository
- version     output version and copyright information
+basic hg commands (use "hg help" for more):
+
+ add        add the specified files on the next commit
+ annotate   show changeset information per file line
+ clone      make a copy of an existing repository
+ commit     commit the specified files or all outstanding changes
+ diff       diff working directory (or selected files)
+ export     dump the header and diffs for one or more changesets
+ init       create a new repository in the current directory
+ log        show the revision history of the repository or a single file
+ pull       pull changes from the specified source
+ push       push changes to the specified destination
+ remove     remove the specified files on the next commit
+ revert     revert modified files or dirs back to their unmodified states
+ serve      export the repository via HTTP
+ status     show changed files in the working directory
+ update     update or merge working directory