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