[gimp/soc-2010-cage] app: Include git commit hash in verbose version output

[Michael Muré <mmure src gnome org>]

commit f92b8e5f6f7eccaf720e0b3474ec786d5d19903c
Author: Martin Nordholts <martinn src gnome org>
Date:   Sat Jan 30 08:10:41 2010 +0100

    app: Include git commit hash in verbose version output
    
    Note:
    * Passes make distcheck
    * The git commit hash is shipped with tarballs
    * Build handles if git-version.h is removed from a tarball

 app/.gitignore  |    9 +++++----
 app/Makefile.am |   26 +++++++++++++++++++++++++-
 app/version.c   |    4 ++++
 3 files changed, 34 insertions(+), 5 deletions(-)
---
diff --git a/app/.gitignore b/app/.gitignore
index 41eacc5..e573136 100644
--- a/app/.gitignore
+++ b/app/.gitignore
@@ -1,9 +1,10 @@
-/Makefile
-/Makefile.in
-/makefile.mingw
 /.deps
 /.libs
+/Makefile
+/Makefile.in
 /gimp-2.*
 /gimp-console-2.*
-/libapp.a
 /gimp.rc
+/git-version.h
+/libapp.a
+/makefile.mingw
diff --git a/app/Makefile.am b/app/Makefile.am
index dd5ef21..1431c00 100644
--- a/app/Makefile.am
+++ b/app/Makefile.am
@@ -70,7 +70,12 @@ libapp_sources = \
 	gimp-log.h	\
 	gimp-intl.h
 
-libapp_a_SOURCES = $(libapp_sources)
+libapp_generated_sources = \
+	git-version.h
+
+$(srcdir)/version.c: git-version.h
+
+libapp_a_SOURCES = $(libapp_sources) $(libapp_generated_sources)
 
 gimp_2_7_SOURCES = $(libapp_sources) main.c
 
@@ -264,3 +269,22 @@ gimp-console.rc.o: gimp.rc
 	$(WINDRES) --define ORIGINALFILENAME_STR="gimp-console-2.7$(EXEEXT)" \
 		--define INTERNALNAME_STR="gimp-console-2.7" \
 		gimp.rc gimp-console.rc.o
+
+# If git is available, always check if git-version.h should be
+# updated. If git is not avaialbe, don't do anything if git-version.h
+# already exists because then we are probably working with a tarball
+# in which case the git-version.h we ship is correct.
+git-version.h: update-git-version-header
+	@if test -d "$(top_srcdir)/.git"; then \
+	  echo "#define GIMP_GIT_VERSION \"`git log HEAD^..HEAD --pretty=format:%H`\"" > "$  tmp"; \
+	elif test ! -f "$@"; then \
+	  echo "#define GIMP_GIT_VERSION \"Unknown, shouldn't happen\"" > "$  tmp"; \
+	fi
+	@if ( test -f "$@" && cmp "$  tmp" "$@" > /dev/null); then \
+	  rm -f "$  tmp"; \
+	elif test -f "$  tmp"; then \
+	  mv "$  tmp" "$@"; \
+	  echo "  git HEAD changed: git-version.h regenerated"; \
+	fi
+
+.PHONY: update-git-version-header
diff --git a/app/version.c b/app/version.c
index 6546c71..0766603 100644
--- a/app/version.c
+++ b/app/version.c
@@ -34,6 +34,7 @@
 
 #include "about.h"
 #include "version.h"
+#include "git-version.h"
 
 #include "gimp-intl.h"
 
@@ -128,6 +129,9 @@ gimp_version_show (gboolean be_verbose)
 
   if (be_verbose)
     {
+      g_print (_("git commit %s"), GIMP_GIT_VERSION);
+      g_print ("\n");
+
       g_print ("\n");
       gimp_show_library_versions ();
     }