add scripts to help with release process

Rakefile

@@ -115,6 +115,12 @@ task :install => "hub" do
   FileUtils.cp "man/hub.1", "#{prefix}/share/man/man1"
 end
 
+#
+# Release
+#
+
+task :release => [:pages, :gem_release, :homebrew]
+
 desc "Copy files to gh-pages branch, but don't publish"
 task :gh_pages => [:check_dirty, "hub", "man/hub.1.html"] do
   cp "man/hub.1.html", "html"
@@ -133,3 +139,33 @@ task :pages => :gh_pages do
   sh "git checkout master"
   puts "Done."
 end
+
+task :gem_release do
+  sh "gem release -t"
+end
+
+desc "Publish to Homebrew"
+task :homebrew do
+  require File.expand_path('../lib/hub/version', __FILE__)
+  Dir.chdir `brew --prefix`.chomp do
+    sh 'git checkout -q master'
+    sh 'git pull -q origin master'
+
+    formula_file = 'Library/Formula/hub.rb'
+    md5 = `curl -#L https://github.com/defunkt/hub/tarball/v#{Hub::VERSION} | md5`.chomp
+    abort unless $?.success? and md5.length == 32
+
+    formula = File.read formula_file
+    formula.sub! /\bv\d+(\.\d+)*/, "v#{Hub::VERSION}"
+    formula.sub! /\b[0-9a-f]{32}\b/, md5
+    File.open(formula_file, 'w') {|f| f << formula }
+
+    branch = "hub-v#{Hub::VERSION}"
+    sh "git checkout -q -B #{branch}"
+    sh "git commit -m 'upgrade hub to v#{Hub::VERSION}' -- #{formula_file}"
+    sh "git push -u mislav #{branch}"
+    sh "hub pull-request 'upgrade hub to v#{Hub::VERSION}'"
+
+    sh "git checkout -q master"
+  end
+end

git-hooks/changed-version.sh

+#!/bin/bash
+## If version file is staged to be committed, display the new version number.
+
+version_file="${1:-lib/hub/version.rb}"
+
+if git rev-parse --verify HEAD >/dev/null 2>&1; then
+  if git diff-index --quiet --cached HEAD -- "$version_file"; then
+    exit 1
+  else
+    git cat-file blob ":$version_file" | grep VERSION | head -1 | cut -d\' -f2
+  fi
+else
+  exit 1
+fi

git-hooks/commit-msg.sh

+#!/bin/bash
+## Checks that commit that changes version number includes it in subject line.
+
+set -e
+
+new_version="$("$(dirname "$0")"/changed-version)" || exit 0
+
+head -1 "$1" | grep "$new_version" >/dev/null || {
+  echo "aborted: version $new_version not present in subject line"
+  exit 1
+}

git-hooks/install

+#!/bin/bash
+## Installs the provided hooks in the current git repo
+
+set -e
+
+hooks_dir="$(git rev-parse --git-dir)/hooks"
+source_dir="$(dirname "$0")"
+
+for file in "$source_dir"/*.sh; do
+  dest="${hooks_dir}/$(basename "$file" .sh)"
+  [[ ! $dest -nt $file ]] && \
+    cp -v "$file" "$dest" && \
+    chmod +x "$dest"
+done
+
+exit 0

git-hooks/pre-commit.sh

+#!/bin/bash
+## Prevents a commit that changes version but doesn't update HISTORY.md
+
+set -e
+
+new_version="$("$(dirname "$0")"/changed-version)" || exit 0
+
+if git cat-file blob :HISTORY.md | head -1 | grep $new_version >/dev/null; then
+  exit 0
+else
+  echo "aborted: History.md is out of date" >&2
+  exit 1
+fi