+#!/bin/sh
+# Tag and push a release.
+
+set -e
+
+# Make sure we're in the project root.
+
+cd $(dirname "$0")/..
+
+# Make sure the darn thing works
+
+bundle update
+
+# Build a new gem archive.
+
+rm -rf jekyll-theme-cayman-*.gem
+gem build -q jekyll-theme-cayman.gemspec
+
+# Make sure we're on the master branch.
+
+(git branch | grep -q 'master') || {
+ echo "Only release from the master branch."
+ exit 1
+}
+
+# Figure out what version we're releasing.
+
+tag=v`ls jekyll-theme-cayman-*.gem | sed 's/^jekyll-theme-cayman-\(.*\)\.gem$/\1/'`
+
+# Make sure we haven't released this version before.
+
+git fetch -t origin
+
+(git tag -l | grep -q "$tag") && {
+ echo "Whoops, there's already a '${tag}' tag."
+ exit 1
+}
+
+# Tag it and bag it.
+
+gem push jekyll-theme-cayman-*.gem && git tag "$tag" &&
+ git push origin master && git push origin "$tag"