[PATCH 01/18] version-gen: reorganize

[Felipe Contreras <felipe.contreras@gmail.com>]

Simply move some code into a `describe` function so it's clear what code
is related to dealing with `git describe`, and what code is the main
functionality.

No functional changes.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
---
 GIT-VERSION-GEN | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
index 9a1111af9b..29d634a30b 100755
--- a/GIT-VERSION-GEN
+++ b/GIT-VERSION-GEN
@@ -6,20 +6,27 @@ DEF_VER=v2.40.GIT
 LF='
 '
 
+describe () {
+	VN=$(git describe --match "v[0-9]*" HEAD 2>/dev/null) || return 1
+	case "$VN" in
+	*$LF*)
+		return 1
+		;;
+	v[0-9]*)
+		git update-index -q --refresh
+		test -z "$(git diff-index --name-only HEAD --)" ||
+		VN="$VN-dirty"
+		return 0
+		;;
+	esac
+}
+
 # First see if there is a version file (included in release tarballs),
 # then try git-describe, then default.
 if test -f version
 then
 	VN=$(cat version) || VN="$DEF_VER"
-elif test -d ${GIT_DIR:-.git} -o -f .git &&
-	VN=$(git describe --match "v[0-9]*" HEAD 2>/dev/null) &&
-	case "$VN" in
-	*$LF*) (exit 1) ;;
-	v[0-9]*)
-		git update-index -q --refresh
-		test -z "$(git diff-index --name-only HEAD --)" ||
-		VN="$VN-dirty" ;;
-	esac
+elif test -d ${GIT_DIR:-.git} -o -f .git && describe
 then
 	VN=$(echo "$VN" | sed -e 's/-/./g');
 else
-- 
2.40.0+fc1