#!/bin/sh

CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
REMOTE="${1:-$(git config --get branch.${CURRENT_BRANCH}.remote)}"
BRANCH="${2:-$CURRENT_BRANCH}"
REPO=$(git config --get remote.${REMOTE}.url | cut -d':' -f2 | cut -d'.' -f1)
if [[ -z "$REPO" ]] || [[ -z "$BRANCH" ]]; then
  echo "usage: $(basename "$0") <remote> <branch (ref)>"
  exit 1
fi
open "https://github.com/${REPO}/compare/${BRANCH}?expand=1"