#!/bin/bash

############################################################################
## git-tag
## Add (deleting, if it already exists) a git tag to a repo (both local & remote)
##
## Usage:
## git-tag tag-name - make/update/push the specified tag-name.
## git-tag -l - list tags.
## git-tag snapshot-BRANCH_SLUG - make the tag name "snapshot-" + current branch name, in "slug" form
############################################################################

TAG=$1
if [ -z "$TAG" ]; then
   echo "Usage: $0 tagname"
   exit 1;
fi

if [ "$TAG" == "-l" ]; then
   git tag -l;
   exit 0;
fi

if [ "$TAG" == "snapshot-BRANCH_SLUG" ]; then
   BRANCH=$(git rev-parse --abbrev-ref HEAD)
   SLUG=$(echo $BRANCH | sed 's/[^a-zA-Z0-9]/-/g')
   TAG="snapshot-$SLUG"
fi

echo
echo "== Deleting $TAG on local"
git tag -d $TAG

echo
echo "== Deleting $TAG on remote"
git push origin :refs/tags/$TAG

echo
echo "== Creating $TAG on local"
git tag $TAG

echo
echo "== Pushing $TAG on remote"
git push origin $TAG