[PATCH/RFC v6 0/2] Add infrastructure for translating Git with gettext

This is version 6 of the patch series to make Git optionally
translatable with GNU gettext.

I had some time on the train so I polished it up since v5. Changes
since then:

  * Add a blurb to INSTALL about GNU libintl being a default
    requirement for building Git.

  * There's now a Test::More test for Git::I18N. That module now has
    complete test coverage.

  * git-sh-i18n.sh now has source code comments how to use it, and
    pointer to the GNU gettext manual for more.

  * Eliminate the use of a wrapper function in the Perl library in
    favor of a symbol table alias.

  * I tested the new Perl code I wrote on perl 5.6.2, it works.

  * The tests now run successfully when Git isn't built with Perl
    support, or when the system doesn't support the locales we're
    trying to test.

  * Improve the new tests by using variables defined in test-lib.sh to
    find out where the git root/po dir is instead of my own
    replacements.

  * Make the tests easier to read by reducing redundancy and using
    e.g. "test_expect_failure grep" instead of calling test_cmp on the
    results of two grep invocations.

  * Add new xgettext translator comment extraction tests.

  * Moved t/t0200-gettext/* tests to t/t0200/*. This follows the
    convention of other tests that have their own subdirs in t/.

  * Add a small (one-line) copyright notice to git-sh-i18n.sh and
    Git::I18N.

Here's the difference between v5 and v6 in git diff --stat -M format:
    
     INSTALL                                            |    8 ++
     Makefile                                           |    6 +-
     git-sh-i18n.sh                                     |   18 +++-
     perl/Git/I18N.pm                                   |   28 ++++--
     po/is.po                                           |    2 -
     t/t0200-gettext.sh                                 |   52 ++++------
     t/{t0200-gettext => t0200}/test.c                  |    0
     t/{t0200-gettext => t0200}/test.perl               |    3 +
     t/{t0200-gettext => t0200}/test.sh                 |    0
     ...ell-fallbacks.sh => t0201-gettext-fallbacks.sh} |   12 ++-
     t/t0202-gettext-perl.sh                            |   20 ++++
     t/t0202/test.pl                                    |  104 ++++++++++++++++++++
     12 files changed, 203 insertions(+), 50 deletions(-)
    
Ævar Arnfjörð Bjarmason (2):
  Add infrastructure for translating Git with gettext
  Add initial C, Shell and Perl gettext translations

 .gitignore                   |    2 +
 INSTALL                      |    8 +++
 Makefile                     |   44 +++++++++++++-
 config.mak.in                |    1 +
 configure.ac                 |    6 ++
 gettext.c                    |   25 ++++++++
 gettext.h                    |   13 ++++
 git-pull.sh                  |   16 +++--
 git-send-email.perl          |    3 +-
 git-sh-i18n.sh               |   47 ++++++++++++++
 git.c                        |    3 +
 perl/Git/I18N.pm             |   91 ++++++++++++++++++++++++++++
 perl/Makefile                |    3 +-
 perl/Makefile.PL             |   14 ++++-
 po/.gitignore                |    1 +
 po/is.po                     |   69 +++++++++++++++++++++
 t/t0200-gettext.sh           |  136 ++++++++++++++++++++++++++++++++++++++++++
 t/t0200/test.c               |   10 +++
 t/t0200/test.perl            |   14 ++++
 t/t0200/test.sh              |   14 ++++
 t/t0201-gettext-fallbacks.sh |   42 +++++++++++++
 t/t0202-gettext-perl.sh      |   20 ++++++
 t/t0202/test.pl              |  104 ++++++++++++++++++++++++++++++++
 t/test-lib.sh                |    1 +
 wt-status.c                  |  107 +++++++++++++++++----------------
 25 files changed, 729 insertions(+), 65 deletions(-)
 create mode 100644 gettext.c
 create mode 100644 gettext.h
 create mode 100644 git-sh-i18n.sh
 create mode 100644 perl/Git/I18N.pm
 create mode 100644 po/.gitignore
 create mode 100644 po/is.po
 create mode 100755 t/t0200-gettext.sh
 create mode 100644 t/t0200/test.c
 create mode 100644 t/t0200/test.perl
 create mode 100644 t/t0200/test.sh
 create mode 100755 t/t0201-gettext-fallbacks.sh
 create mode 100755 t/t0202-gettext-perl.sh
 create mode 100644 t/t0202/test.pl