Add perforce support to showrev.sh
In order to generate meaningful output from SDL_GetRevision()
diff --git a/build-scripts/showrev.sh b/build-scripts/showrev.sh
index 517992d..788d7ef 100755
--- a/build-scripts/showrev.sh
+++ b/build-scripts/showrev.sh
@@ -2,4 +2,24 @@
#
# Print the current source revision, if available
-hg parents --template 'hg-{rev}:{node|short}' || (echo "hg-0:baadf00d"; exit 1)
+SDL_ROOT=$(dirname $0)/..
+cd $SDL_ROOT
+
+if [ -x "$(command -v hg)" ]; then
+ rev="$(hg parents --template 'hg-{rev}:{node|short}' 2>/dev/null)"
+ if [ "$?" == 0 ]; then
+ echo $rev
+ exit 0
+ fi
+fi
+
+if [ -x "$(command -v p4)" ]; then
+ rev="$(p4 changes -m1 ./...\#have 2>/dev/null| awk '{print $2}')"
+ if [ "$?" == 0 ]; then
+ echo $rev
+ exit 0
+ fi
+fi
+
+echo "hg-0:baadf00d"
+exit 1
