1#!/bin/sh
2
3GVF=GIT-VERSION-FILE
4DEF_VER=0.21.GITGUI
5
6LF='
7'
8
9tree_search ()
10{
11	head=$1
12	tree=$2
13	for p in $(git rev-list --parents --max-count=1 $head 2>/dev/null)
14	do
15		test $tree = $(git rev-parse $p^{tree} 2>/dev/null) &&
16		vn=$(git describe --abbrev=4 $p 2>/dev/null) &&
17		case "$vn" in
18		gitgui-[0-9]*) echo $vn; break;;
19		esac
20	done
21}
22
23# Always use the tarball version file if found, just
24# in case we are somehow contained in a larger git
25# repository that doesn't actually track our state.
26# (At least one package manager is doing this.)
27#
28# We may be a subproject, so try looking for the merge
29# commit that supplied this directory content if we are
30# not at the toplevel.  We probably will always be the
31# second parent in the commit, but we shouldn't rely on
32# that fact.
33#
34# If we are at the toplevel or the merge assumption fails
35# try looking for a gitgui-* tag.
36
37if test -f version &&
38   VN=$(cat version)
39then
40	: happy
41elif prefix="$(git rev-parse --show-prefix 2>/dev/null)"
42   test -n "$prefix" &&
43   head=$(git rev-list --max-count=1 HEAD -- . 2>/dev/null) &&
44   tree=$(git rev-parse --verify "HEAD:$prefix" 2>/dev/null) &&
45   VN=$(tree_search $head $tree)
46   case "$VN" in
47   gitgui-[0-9]*) : happy ;;
48   *) (exit 1) ;;
49   esac
50then
51	VN=$(echo "$VN" | sed -e 's/^gitgui-//;s/-/./g');
52elif VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
53   case "$VN" in
54   gitgui-[0-9]*) : happy ;;
55   *) (exit 1) ;;
56   esac
57then
58	VN=$(echo "$VN" | sed -e 's/^gitgui-//;s/-/./g');
59else
60	VN="$DEF_VER"
61fi
62
63dirty=$(sh -c 'git diff-index --name-only HEAD' 2>/dev/null) || dirty=
64case "$dirty" in
65'')
66	;;
67*)
68	VN="$VN-dirty" ;;
69esac
70
71if test -r $GVF
72then
73	VC=$(sed -e 's/^GITGUI_VERSION = //' <$GVF)
74else
75	VC=unset
76fi
77test "$VN" = "$VC" || {
78	echo >&2 "GITGUI_VERSION = $VN"
79	echo "GITGUI_VERSION = $VN" >$GVF
80}
81