[PATCH 1/3] gettext: avoid initialization if the locale dir is not present

[Johannes Schindelin <johannes.schindelin@gmx.de>]

The runtime of a simple `git.exe version` call on Windows is currently
dominated by the gettext setup, adding a whopping ~150ms to the ~210ms
total.

Given that this cost is added to each and every git.exe invocation goes
through common-main's invocation of git_setup_gettext(), and given that
scripts have to call git.exe dozens, if not hundreds, of times, this is
a substantial performance penalty.

This is particularly pointless when considering that Git for Windows
ships without localization (to keep the installer's size to a bearable
~34MB): all that time setting up gettext is for naught.

So let's be smart about it and skip setting up gettext if the locale
directory is not even present.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 gettext.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gettext.c b/gettext.c
index baba28343c3..701355d66e7 100644
--- a/gettext.c
+++ b/gettext.c
@@ -163,6 +163,9 @@ void git_setup_gettext(void)
 	if (!podir)
 		podir = system_path(GIT_LOCALE_PATH);
 
+	if (!is_directory(podir))
+		return;
+
 	bindtextdomain("git", podir);
 	setlocale(LC_MESSAGES, "");
 	setlocale(LC_TIME, "");
-- 
2.17.0.windows.1.15.gaa56ade3205