dispatch: don't show list of commands on bogus command

If a command is ambiguous, you get this:

  $ hg ve
  hg: command 've' is ambiguous:
      verify version
  [255]

If you typo a command, you get this:

  $ hg comit
  hg: unknown command 'comit'
  (did you mean one of commit, incoming, mycommit?)
  [255]

But if you completely mistype a command so it no longer looks like any
existing commands, you get a full list of commands. That might be
useful the first time you use Mercurial, but after that it's probably
more annoying than help, especially if you have the pager enabled and
have a short terminal. Let's instead give a short hint telling the
user to run `hg help` for more help.

Differential Revision: https://phab.mercurial-scm.org/D4024

mercurial/dispatch.py

@@ -394,9 +394,8 b' def _callcatch(ui, func):'
                     _reportsimilar(ui.warn, sim)
                     suggested = True
             if not suggested:
-                ui.pager('help')
                 ui.warn(nocmdmsg)
-                commands.help_(ui, 'shortlist')
+                ui.warn(_("(use 'hg help' for a list of commands)\n"))
     except IOError:
         raise
     except KeyboardInterrupt:

tests/test-extension.t

@@ -1683,6 +1683,7 b' Prohibit registration of commands that d'
   *** failed to import extension deprecatedcmd from $TESTTMP/deprecated/deprecatedcmd.py: missing attributes: norepo, optionalrepo, inferrepo
   *** (use @command decorator to register 'deprecatedcmd')
   hg: unknown command 'deprecatedcmd'
+  (use 'hg help' for a list of commands)
   [255]
 
  the extension shouldn't be loaded at all so the mq works:

tests/test-help.t

@@ -652,29 +652,7 b' Test command without options'
 
   $ hg skjdfks
   hg: unknown command 'skjdfks'
-  Mercurial Distributed SCM
-  
-  basic commands:
-  
-   add           add the specified files on the next commit
-   annotate      show changeset information by line for each file
-   clone         make a copy of an existing repository
-   commit        commit the specified files or all outstanding changes
-   diff          diff repository (or selected files)
-   export        dump the header and diffs for one or more changesets
-   forget        forget the specified files on the next commit
-   init          create a new repository in the given directory
-   log           show revision history of entire repository or files
-   merge         merge another revision into working directory
-   pull          pull changes from the specified source
-   push          push changes to the specified destination
-   remove        remove the specified files on the next commit
-   serve         start stand-alone webserver
-   status        show changed files in the working directory
-   summary       summarize working directory state
-   update        update working directory (or switch revisions)
-  
-  (use 'hg help' for the full list of commands or 'hg -v' for details)
+  (use 'hg help' for a list of commands)
   [255]
 
 Typoed command gives suggestion

tests/test-status-color.t

@@ -393,6 +393,7 b' color coding of error message with curre'
 
   $ hg unknowncommand > /dev/null
   hg: unknown command 'unknowncommand'
+  (use 'hg help' for a list of commands)
   [255]
 
 color coding of error message without curses
@@ -400,6 +401,7 b' color coding of error message without cu'
   $ echo 'raise ImportError' > curses.py
   $ PYTHONPATH=`pwd`:$PYTHONPATH hg unknowncommand > /dev/null
   hg: unknown command 'unknowncommand'
+  (use 'hg help' for a list of commands)
   [255]
 
   $ cd ..

tests/test-strict.t

@@ -15,29 +15,7 b''
 
   $ hg an a
   hg: unknown command 'an'
-  Mercurial Distributed SCM
-  
-  basic commands:
-  
-   add           add the specified files on the next commit
-   annotate      show changeset information by line for each file
-   clone         make a copy of an existing repository
-   commit        commit the specified files or all outstanding changes
-   diff          diff repository (or selected files)
-   export        dump the header and diffs for one or more changesets
-   forget        forget the specified files on the next commit
-   init          create a new repository in the given directory
-   log           show revision history of entire repository or files
-   merge         merge another revision into working directory
-   pull          pull changes from the specified source
-   push          push changes to the specified destination
-   remove        remove the specified files on the next commit
-   serve         start stand-alone webserver
-   status        show changed files in the working directory
-   summary       summarize working directory state
-   update        update working directory (or switch revisions)
-  
-  (use 'hg help' for the full list of commands or 'hg -v' for details)
+  (use 'hg help' for a list of commands)
   [255]
   $ hg annotate a
   0: a