enable userdiff for more things in git.git

A noticed that git.git doesn't have userdiff enabled for perl files, and looking over some recent patches this gave better results, while I'm at it add one for Python too. I couldn't find anything in gitattributes(5) that was worth the bother of enabling this (e.g. we just have one Ruby file).

Ævar Arnfjörð Bjarmason (3):
.gitattributes: add *.pl extension for Perl
.gitattributes: use the "perl" differ for Perl
.gitattributes: add a diff driver for Python

 .gitattributes | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

2.17.0.290.gded63e768a

Change the list of Perl extensions added in 00ddc9d13c ("Fix build with core.autocrlf=true", 2017-05-09) to also include *.pl, we have some of those in the tree, e.g. in t/.

---
 .gitattributes | 1 +
 1 file changed, 1 insertion(+)

index 8ce9c6b888..482af05a6a 100644
@@ -2,6 +2,7 @@
 *.[ch] whitespace=indent,trail,space diff=cpp
 *.sh whitespace=indent,trail,space eol=lf
 *.perl eol=lf
+*.pl eof=lf
 *.pm eol=lf
 /Documentation/git-*.txt eol=lf
 /command-list.txt eol=lf

2.17.0.290.gded63e768a

As noted in gitattributes(5) this gives better patch context for these types of files.

---
 .gitattributes | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

index 482af05a6a..aa08dd219d 100644
@@ -1,9 +1,9 @@
 * whitespace=!indent,trail,space
 *.[ch] whitespace=indent,trail,space diff=cpp
 *.sh whitespace=indent,trail,space eol=lf
-*.perl eol=lf
-*.pl eof=lf
-*.pm eol=lf
+*.perl eol=lf diff=perl
+*.pl eof=lf diff=perl
+*.pm eol=lf diff=perl
 /Documentation/git-*.txt eol=lf
 /command-list.txt eol=lf
 /GIT-VERSION-GEN eol=lf

2.17.0.290.gded63e768a

Declare that the *.py files in our tree are Python for the purposes of diffing, and as in 00ddc9d13c ("Fix build with core.autocrlf=true", 2017-05-09) set eol=lf on them, which makes sense like with the *.perl files.

---
 .gitattributes | 1 +
 1 file changed, 1 insertion(+)

index aa08dd219d..1bdc91e282 100644
@@ -4,6 +4,7 @@
 *.perl eol=lf diff=perl
 *.pl eof=lf diff=perl
 *.pm eol=lf diff=perl
+*.py eol=lf diff=python
 /Documentation/git-*.txt eol=lf
 /command-list.txt eol=lf
 /GIT-VERSION-GEN eol=lf

2.17.0.290.gded63e768a

All looked sane, except one minor "Huh?" in the titles.

The last one in the above list makes it look as if you are adding the func header pattern and/or textconv filter for Python source code, but the patch actually just specifies that .py is to be processed by the existing diff driver meant for Python, and at least to me, the wording for the second one reflects that better.