[PATCH] D50147: clang-format: support external styles

[Francois Ferrand via Phabricator via cfe-commits]

Typz created this revision.
Typz added reviewers: krasimir, djasper, klimek.
Herald added a subscriber: acoomans.

This patch allows defining external styles, which can be used exactly
like the embedded styles (llvm, google, mozilla...).

These styles are clang-format files installed either systemwide in
/usr/local/share/clang-format, or per-user in ~/.local/share/clang-
format. These can be specified by simply using the name of the file,
and clang-format will search the directories for the style:

  clang-format -style=foo-1.0

The patch also allows loading specifying a file name directly, either
relative or absolute:

  clang-format -style=/home/clang-format-styles/foo-1.0
  clang-format -style=styles/foo-1.0

This works also in `BaseOnStyle` field, which allows defining compagny-
wide (and possibly versionned) clang-format styles, without having to
maintain many copies in each repository: each repository will simply
need to store a short .clang-format, which simply references the
compagny-wide style.

The drawback is that these style need to be installed on each computer,
but this may be automated through an OS package. In any case, the error
cannot be ignored, as the user will be presented with an error message
if he does not have the style.

NOTE: this may be further improved by also allowing URL (http://,
git://...) in this field, which would allow clang-format to automatically
download the missing styles.


Repository:
  rC Clang

https://reviews.llvm.org/D50147

Files:
  include/clang/Format/Format.h
  lib/Basic/VirtualFileSystem.cpp
  lib/Format/Format.cpp
  unittests/Format/FormatTest.cpp

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