SourceTree Custom Actions to open the selected FILE, SHA, or REPO on github.com

sourcetree_custom_actions_open_on_github.rb

#!/usr/bin/env ruby

## Setup the following Custom Actions in SourceTree preferences in order
## to easily open a FILE or commit SHA in a browser on github.com

# No need to checkmark "Open in Separate Window" or "Show in Full Output"

# Menu Caption:  Open SHA on github.com
# Script to run: ~/path/to/this_script.rb
# Parameters:    $SHA

# Menu Caption:  Open File on github.com
# Script to run: ~/path/to/this_script.rb
# Parameters:    $FILE

# Menu Caption:  Open REPO on github.com
# Script to run: ~/path/to/this_script.rb
# Parameters:    $REPO


if ARGV.empty?
  puts "Expecting a $SHA, $FILE, or $REPO. See the comments in this script for details"
  exit 1
end

# Get the input param
script_input_param = ARGV[0]

# Found out what the github.com remote url is
remote_url = `git config --get remote.origin.url`.chomp

# Error Checking
if remote_url == ''
  puts 'Error: The remote url for this repository has not been set'
  exit 1
elsif !remote_url.include? 'github.com'
  puts 'Error: This script is only setup for github.com repos'
  exit 1
end

# Transform git@github.com:user/repo-name.git -> https://github.com/user/repo-name
github_repo_url = remote_url.sub(/git@github.com:/, 'https://github.com/').sub(/.git$/, '')

# Determine if a $REPO, $SHA, or $FILE was passed in and open the appropriate page
if script_input_param.start_with? '/Users/'
  # $REPO
  system("open #{github_repo_url}")
elsif script_input_param =~ /\b[0-9a-f]{5,40}\b/
  # $SHA
  github_commit_url = "#{github_repo_url}/commit/#{script_input_param}"
  system("open #{github_commit_url}")
else
  # $FILE
  github_file_url = "#{github_repo_url}/blob/master/#{script_input_param}"
  system("open #{github_file_url}")
end