#!/bin/bash

# 
# finishGoogleCodeGitHubWikiMigration
# 
# For projects that have been migrated from Google Code to GitHub, move wiki data from the
# 'wiki' branch to the project's README.md & its GitHub wiki.
# 
# v0.1   2015-03-15 - Morgan Aldridge <morgant@makkintosshu.com>
#                     Initial version.
# v0.2   2015-03-28 - Morgan Aldridge
#                     HTTPS support, with thanks to Piper Chester.
# v0.3   2015-09-12 - Morgan Aldridge
#                     Fixes to HTTPS support.
# 
# Copyright (c) 2015 Morgan T. Aldridge
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
# 

# validate input
https=false
if [[ ( $# -eq 1 ) && ( "$1" =~ ^git@github.com:([^/]+)/(.+).git ) ]]; then
	user="${BASH_REMATCH[1]}"
	repo="${BASH_REMATCH[2]}"
elif [[ ( $# -eq 1 ) && ( "$1" =~ https://github.com/([^/]+)/(.+).git ) ]]; then
    user="${BASH_REMATCH[1]}"
    repo="${BASH_REMATCH[2]}"
    https=true
else
	echo "$0: Invalid input!"
	echo "Exiting."
	exit 1
fi

# clone the repo & wiki repos
if [[ ( -e "$repo" ) || ( -e "${repo}.wiki" ) ]]; then
	echo "Either '$repo' or '${repo}.wiki' already exist!"
	echo "Exiting."
	exit 1
fi
echo -n "Cloning '${user}/${repo}'... "
if git clone -q "$1"; then
	echo "Done."
else
	echo "Error!"
	echo "Exiting."
	exit 1
fi
echo -n "Cloning '${user}/${repo}.wiki'... "
if $https && git clone -q "https://github.com/${user}/${repo}.wiki.git"; then
    echo "Done over HTTPS."
elif ! $https && git clone -q "git@github.com:${user}/${repo}.wiki.git"; then
	echo "Done."
else
	echo "Error!"
	echo "Exiting."
	exit 1
fi

# move the ProjectHome page to README in the main repo, if one doesn't exist
echo -n "Moving ProjectHome.md from wiki branch to README.md in master branch... "
if [[ ! -e "${repo}/README.md" ]]; then
	cd "$repo"
	git checkout -q wiki
	if [[ ! -e "ProjectHome.md" ]]; then
		echo "ProjectHome.md doesn't exist."
	else
		cp "ProjectHome.md" "README.md"
		sed -i"" -e "s/\(([^\)]+).md\)/(wiki\/\1)/g" README.md
		git checkout -q master
		git add README.md
		git commit -q -m "$0: Moved ProjectHome.md from wiki branch to README.md in master branch."
		echo "Done."
	fi
	cd ..
else
	echo "README.md already exists! Skipping."
fi

# copy all the pages from the wiki branch to the wiki repo
echo -n "Moving pages from wiki branch to ${repo}.wiki repo... "
cd "$repo"
git checkout -q wiki
rsync -a -p *.md ../${repo}.wiki/
git checkout -q master
cd ../${repo}.wiki
mv ProjectHome.md Home.md
find . -name "*.md" -exec sed -i"" -e "s/\(([^\)]+).md\)/(\1)/g" '{}' +
# find . -name "*.md" | xargs sed -i "" -e "s/\(([^\)]+).md\)/(\1)/g"
git add *.md
git commit -q -m "$0: Moved pages from $repo wiki branch to ${repo}.wiki master branch."
echo "Done."


# display followup instructions
echo
echo "The '$repo' & '${repo}.wiki' clones have been updated & commits applied."
echo "Please review both (I suggest at least a 'git log' & 'git diff HEAD^1') "
echo "and only perform a 'git push' on each, if the results are satisfactory."