Open a project file on GitHub.

gh

#!/bin/bash
#
# Open the specified file on GitHub. It will use the master branch by default:
#
#   gh app/controllers/application_controller.rb
#
# Specify the current branch:
#
#   gh -c app/controllers/application_controller.rb
#
# Specify a specific branch:
#
#   gh -b another-branch app/controllers/application_controller.rb
#

if [ -d .git ]; then
  echo "Opening on Github..."

  BRANCH="master"

  while getopts "b:c:" option
  do
    case "$option" in
      b) BRANCH=$OPTARG;;
      c) BRANCH=$(git rev-parse --abbrev-ref HEAD);;
    esac
  done
  shift $(($OPTIND-1))
  FILE=$1

  BASE=$(git config --get remote.origin.url | sed s/\\.git// | sed 's/:/\//' | sed 's/.*github.com/https:\/\/github.com/')
  if [[ -z "$FILE" ]]; then
    URL="$BASE/tree/$BRANCH"
  else
    RELATIVE_PATH=$(git ls-tree --full-name --name-only HEAD $FILE)
    URL="$BASE/blob/$BRANCH/$RELATIVE_PATH"
  fi

  if which xdg-open > /dev/null
  then
    xdg-open $URL
  elif which gnome-open > /dev/null
  then
    gnome-open $URL
  elif which open > /dev/null
  then
    open $URL
  fi
  echo "Opened $URL"
else
  echo "Not a git repo"
fi