Add tagger.sh

Author: mpoullet

tagger.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+set -e
+set -u
+#set -x
+
+# extract AC_INIT package and version
+PACKAGE=$(sed -nr "/^AC_INIT\b/{ s/^[^(]*\([ 	]*([^,	 ]+).*/\1/; s/\[|]//g; p; }" configure.ac)
+echo PACKAGE="$PACKAGE"
+
+VERSION=$(sed -nr "/^AC_INIT\b/{ s/^[^,]*,[^0-9]*([0-9.]*).*/\1/; p; }" configure.ac)
+[[ $VERSION =~ ^[0-9.]+$ ]] || die "failed to detect package version"
+echo VERSION="$VERSION"
+
+if git show-ref --tags --quiet --verify -- "refs/tags/$VERSION"
+then
+echo "tag $VERSION already exists"
+exit 1
+else
+git tag "$VERSION"
+fi