#!/bin/bash

# Opens the github page for a repo/branch in your browser.
# https://github.com/paulirish/git-open/
#
# git open
# git open [remote] [branch]


# are we in a git repo?
git rev-parse --is-inside-work-tree &>/dev/null

if [[ $? != 0 ]]
then
    echo "Not a git repository."
    exit 1
fi


# assume origin if not provided
# fallback to upstream if neither is present.
remote="origin"
if [ ! -z "$1" ]
then
    remote="$1"
fi

remote_url="remote.${remote}.url"

giturl=$(git config --get $remote_url)
if [ -z "$giturl" ]
then
    echo "$remote_url not set."
    exit 1
fi

# get current branch
if [ -z "$2" ]
then
    branch=`git symbolic-ref -q --short HEAD`
else
    branch="$2"
fi

# Make # and % characters url friendly
branch=${branch//%/%25} && branch=${branch//#/%23}

# URL normalization
# Github gists
if grep -q gist.github <<<$giturl; then
    giturl=${giturl/git\@gist.github\.com\:/https://gist.github.com}
    providerUrlDifference=tree
# Github 
elif grep -q github <<<$giturl; then
    giturl=${giturl/git\@github\.com\:/https://github.com/}
    providerUrlDifference=tree
# bitbucket 
elif grep -q bitbucket <<<$giturl; then
    giturl=${giturl/git\@bitbucket\.org\:/https://bitbucket.org/}
    providerUrlDifference=branch
# Atlassian Stash
elif grep -q "/scm/" <<<$giturl; then
  re='(.*)/scm/(.*)/(.*)\.git'
  if [[ $giturl =~ $re ]]
  then
    giturl=${BASH_REMATCH[1]}/projects/${BASH_REMATCH[2]}/repos/${BASH_REMATCH[3]}
    providerUrlDifference=browse
    branch="?at=refs%2Fheads%2F${branch}"
  fi
# Gitlab
else
  # custom gitlab
  gitlab_domain=$(git config --get gitopen.gitlab.domain)
  if [ ! -z "$gitlab_domain" ]; then
    if grep -q $gitlab_domain <<<$giturl; then
      giturl=${giturl/git\@${gitlab_domain}:/https://${gitlab_domain}/}
      providerUrlDifference=tree
    fi
  # hosted gitlab
  elif grep -q gitlab <<<$giturl; then
    giturl=${giturl/git\@gitlab\.com\:/https://gitlab.com/}
    providerUrlDifference=tree
  fi
fi
giturl=${giturl%\.git}

if [ ! -z "$branch" ]
then
    giturl="${giturl}/${providerUrlDifference}/${branch}"
fi

# simplify URL for master
giturl=${giturl/tree\/master/}

# get current open browser command
case $( uname -s ) in
Darwin)  open=open;;
MINGW*)  open=start;;
CYGWIN*) open=cygstart;;
*)       open=xdg-open;;
esac

# open it in a browser
$open $giturl &> /dev/null
exit 0