[PATCH 2/2] Teach git diff about BibTeX head hunk patterns

[Gustaf Hendeby <hendeby@isy.liu.se>]

All BibTeX entries starts with an @ followed by an entry type.  Since
there are many entry types and own can be defined, the pattern matches
legal entry type names instead of just the default types (which would
be a long list).  The pattern also matches strings and comments since
they will also be useful to position oneself in a bib-file.

Signed-off-by: Gustaf Hendeby <hendeby@isy.liu.se>
---

I know this is the wrong time to introduce something new, late in the
rc cycle.  However I had it bundled with the documentation update I
think should be considered now.  Feel free to ignore for the moment
and I'll resend post 1.6.0.

A quick question here is what the policy there is for introducing new
built in head hunk patterns, and if a BibTeX pattern fits there.  If
not, may I suggest a list somewhere with suggested patterns so that
each user doesn't have to reinvent the wheel?

/Gustaf

 Documentation/gitattributes.txt |    2 ++
 diff.c                          |    1 +
 2 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index c61a58d..db16b0c 100644
--- a/Documentation/gitattributes.txt
+++ b/Documentation/gitattributes.txt
@@ -310,6 +310,8 @@ configuration file (you still need to enable this with the
 attribute mechanism, via `.gitattributes`).  The following built in
 patterns are available:
 
+- `bibtex` suitable for files with BibTeX coded references.
+
 - `java` suitable for source code in the Java lanugage.
 
 - `pascal` suitable for source code in the Pascal/Delphi language.
diff --git a/diff.c b/diff.c
index 6954f99..fa8c620 100644
--- a/diff.c
+++ b/diff.c
@@ -1387,7 +1387,7 @@ static struct builtin_funcname_pattern {
 			"\\|"
 			"^\\(.*=[ \t]*\\(class\\|record\\).*\\)$"
 			},
+	{ "bibtex", "\\(@[a-zA-Z]\\{1,\\}[ \t]*{\\{0,1\\}[ \t]*[^ \t\"@',\\#}{~%]*\\).*$" },
 	{ "tex", "^\\(\\\\\\(\\(sub\\)*section\\|chapter\\|part\\)\\*\\{0,1\\}{.*\\)$" },
 	{ "ruby", "^\\s*\\(\\(class\\|module\\|def\\)\\s.*\\)$" },
 };
-- 
1.6.0.rc2.30.gf3f0.dirty