cmdutil: add a hook for making custom non-follow log file matchers This will be used by largefiles (and basically only by largefiles) in an upcoming patch.

cmdutil: rename _makelogfilematcher to _makefollowlogfilematcher We're going to add a _makenofollowlogfilematcher in an upcoming patch.

merge with stable

alias: exit from bad definition by Abort

alias: show one-line hint for command provided by disabled extension It will be a hint of Abort exception. "hg help <alias>" provides the detailed version as before.

help: provide help of bad alias without executing aliascmd() The output is slightly changed because of minirst formatting. Previously, ui.pushbuffer() had no effect because "badalias" message was written to stderr. "if not unknowncmd" should no longer be needed because there's no call loop.

alias: provide "unknowncmd" flag to tell help to look for disabled command This patch prepares for breaking the call loop: help.help_() -> cmdalias() -> commands.help_() -> help.help_().

alias: keep error message in "badalias" so that help can see it Upcoming patches will - change help_() to get badalias message without executing cmdalias() - raise Abort on bad alias

alias: add test for alias command provided by disabled extension This should complete cases where "badalias" is set.

alias: expand "$@" as list of parameters quoted individually (BC) (issue4200) Before this patch, there was no way to pass in all the positional parameters as separate words down to another command. (1) $@ (without quotes) would expand to all the parameters separated by a space. This would work fine for arguments without spaces, but arguments with spaces in them would be split up by POSIX shells into separate words. (2) '$@' (in single quotes) would expand to all the parameters within a pair of single quotes. POSIX shells would then treat the entire list of arguments as one word. (3) "$@" (in double quotes) would expand similarly to (2). With this patch, we expand "$@" (in double quotes) as all positional parameters, quoted individually with util.shellquote, and separated by spaces. Under standard field-splitting conditions, POSIX shells will tokenize each argument into exactly one word. This is a backwards-incompatible change, but the old behavior was arguably a bug: Bourne-derived shells have expanded "$@" as a tokenized list of positional parameters for a very long time. I could find this behavior specified in IEEE Std 1003.1-2001, and this probably goes back to much further before that.