git: Simplify the git-opr command

Rewritten in bash and as a wrapper around GitHub's `gh` command.

- Pushed an unpushed branch to origin.
- Opens an existing pull request if one exists.
- Creates a new pull request if one doesn't exist.

bin/git-opr

@@ -1,106 +1,26 @@
-#!/usr/bin/env ruby
-#/ Usage: git pr [<branch>]
-#/ Open the pull request page for <branch>, or the current branch if not
-#/ specified. Lands on the new pull request page when no PR exists yet.
-#/ The local branch must be tracking the remote branch.
+#!/bin/bash
 
-# Based on script from @rtomayko. Translated into ruby and now uses branch
-# tracking rather than expecting local and remote branch to have same name
+set -e
 
-require "json"
-require "yaml"
+ensure_is_published() {
+  [[ ! $is_published ]] && git publish
+}
 
-OPEN_SWITCHES = %{-o --open}
+is_published() {
+  echo $(git upstream)
+}
 
-def remote_url
-  url = chomped_system_call('git config --get remote.origin.url')
-  repo_with_owner = url.match(/:(.*)\.git/)
+open_or_build_pull_request() {
+  type gh &>/dev/null
 
-  if repo_with_owner
-    repo_with_owner[1]
-  else
-    die 'Unable to determine repo/owner for remote origin. Using https?'
-  end
-end
+  if [ $? -ne 0 ]; then
+    echo "Error: gh command not found."
+    exit 1
+  fi
 
-def oauth_token
-  hub_config = YAML.load_file(File.expand_path('~/.config/hub'))
-  hub_config['github.com'][0]['oauth_token']
-end
+  # Load an existing PR, or create a new one.
+  gh pr view --web || gh pr create --assignee opdavies --web
+}
 
-def open_or_build_pull_request
-  auth = "Authorization: token #{oauth_token}"
-  pulls_endpoint = "https://api.github.com/repos/#{remote_url}/pulls"
-  response = `curl --silent -H '#{auth}' #{pulls_endpoint}`
-  pulls = JSON.parse(response)
-  pull = pulls.detect { |pull| pull["head"]["ref"] == remote_tracking_branch }
-  if !pull.nil?
-    system "open-tab --reload #{pull['html_url']}"
-  else
-    system("open https://github.com/#{remote_url}/pull/#{remote_tracking_branch}")
-  end
-end
-
-def remote_tracking_branch
-  command = 'git rev-parse --abbrev-ref --symbolic-full-name @{u} 2>/dev/null'
-  tracking = chomped_system_call(command)
-
-  if tracking == '@{u}'
-    die 'Current local branch not setup to track remote branch.'
-  else
-    branch_without_remote_name(tracking)
-  end
-end
-
-def branch_without_remote_name(branch_and_remote)
-  branch = branch_and_remote.match(/origin\/(.*)/)
-
-  if branch
-    branch[1]
-  else
-    die 'Expected remote to be \'origin\''
-  end
-end
-
-def chomped_system_call(command)
-  `#{command}`.chomp
-end
-
-def open_pull_request_for_repo_branch(repo, branch)
-  system("open https://github.com/#{repo}/pull/#{branch}")
-end
-
-def opening?
-  argument = ARGV.pop
-  argument && OPEN_SWITCHES.include?(argument)
-end
-
-def ensure_published
-  if not_published?
-    system("git publish")
-  end
-end
-
-def not_published?
-  !system("git upstream > /dev/null 2>&1")
-end
-
-def main
-  # repo = remote_url
-  # branch = remote_tracking_branch
-  if opening?
-    system 'git log --reverse master..HEAD --format="%H%n%s%n%b" > .git/pr-commits'
-    system 'gh compare'
-    system 'gh pull-request'
-  else
-    ensure_published
-    open_or_build_pull_request
-  end
-end
-
-def die(msg)
-  puts msg
-  exit 1
-end
-
-main
+ensure_is_published
+open_or_build_pull_request