[Bug 6709] New: Glob expressions in subinclude

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=6709

            Bug ID: 6709
           Summary: Glob expressions in subinclude
           Product: Mercurial
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at mercurial-scm.org
          Reporter: woljiri at gmail.com
                CC: mercurial-devel at mercurial-scm.org
    Python Version: ---

I would like to use glob expressions in ‘subinclude:’ and ‘include:’ lines in
.hgignore files to match multiple ignore files or include files in any
subdirectory.

Use cases
═════════

Multiple ignore files
─────────────────────

I have several ignore files that are generated by the build system. It would be
too much error-prone to manage them manually.

Files

  foo.hgignore
  bar.hgignore

I would add this line to the source-root .hgignore file:

  syntax: glob
  include:?*.hgignore

Ignore files in subdirectories
──────────────────────────────

The project is divided into multiple parts, each residing in one subdirectory.
To apply all the ignore files, I would add this to the main .hgignore file:

  subinclude:*/.hgignore


Implementation
══════════════

Finding files using glob-expressions that have the wildcards in directory names
can be quite expensive. I suggest also adding some kind of cache (or something)
that would make the lookup faster. If there is no cache, such glob-expressions
would slight higher performance impact on operations that use the ignore files,
but I think that it would not be big problem for most projects.

My idea about the cache:  When the ignore entry list caching is enabled (in
hgrc), only one hgignore file, located in the .hg directory (let's say
.hg/cached-ignore) is used instead of other ignore files. This file contains
all the hgignore files merged, but still with globs and regular expressions
unexpanded. It is updated manually, by invoking command, let's say, hg
update-ignore. This would make the lookup much faster, but at cost of one
additional command after changing the ignore rules. Smarter approaches could be
also used, such as comparing ctimes of .hg/cached-ignore with the other ignore
files etc.

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