[PATCH util-macros] XORG_GIT_MODULE_VERSION: writes module version in xorg-git-version.h

[Gaetan Nadon]

Generates the git module version according to the "git describe HEAD"
If the git module has pending changes, it appends "-dirty" to the version tag

Signed-off-by: Gaetan Nadon <memsize at videotron.ca>
---
 xorg-macros.m4.in |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/xorg-macros.m4.in b/xorg-macros.m4.in
index 916b472..efb2e53 100644
--- a/xorg-macros.m4.in
+++ b/xorg-macros.m4.in
@@ -1009,3 +1009,21 @@ mv \$(top_srcdir)/.INSTALL.tmp \$(top_srcdir)/INSTALL) \
 echo 'util-macros \"pkgdatadir\" from xorg-macros.pc not found: installing possibly empty INSTALL.' >&2)"
 AC_SUBST([INSTALL_CMD])
 ]) # XORG_INSTALL
+
+# XORG_GIT_MODULE_VERSION()
+# -------------------------
+# Minimum version: 1.8.0
+#
+# Generates the git module version according to the "git describe HEAD"
+# If the git module has pending changes, it appends "-dirty" to the version tag
+#
+AC_DEFUN([XORG_GIT_MODULE_VERSION], [
+GIT_MODULE_VERSION_CMD="VER=\`GIT_DIR=\$(top_srcdir)/.git git describe HEAD 2>/dev/null\`; \
+DVER=\`GIT_DIR=\$(top_srcdir)/.git git diff-index HEAD 2>/dev/null\`; \
+OUTSTR=\"\#undef XORG_GIT_VERSION\" ; \
+OUTFILE=\"xorg-git-version.h\"; \
+test -n \"\$\$VER\" && OUTSTR=\"\#define XORG_GIT_VERSION \$\$VER\" && test -n \"\$\$DVER\" && OUTSTR=\"\#define XORG_GIT_VERSION \$\$VER-dirty\"; \
+test -e \"\$\$OUTFILE\" || echo \"\$\$OUTSTR\" > \"\$\$OUTFILE\"; \
+CONTENT=\`cat \$\$OUTFILE\` && test \"\$\$CONTENT\" = \"\$\$OUTSTR\" || echo \$\$OUTSTR > \$\$OUTFILE;"
+AC_SUBST([GIT_MODULE_VERSION_CMD])
+]) # XORG_GIT_MODULE_VERSION
-- 
1.6.0.4