Open up diff on Github

git-hubdiff

#!/usr/bin/env bash

# Opens the comparison of two commits on Github (only for repositories on Github)

# Download this script as "git-hubdiff" (no extension), chmod it to be executable and put it in your
# path somewhere (e.g. /usr/bin). You can then use it via `git hubdiff` from inside any git repo.

usage()
{
  echo "USAGE"
  echo "compare commit to head : git hubdiff <commit>"
  echo "compare two commits    : git hubdiff <commit> <commit>"
}

while getopts "h:" opt; do
  case $opt in
    h)
      usage
      exit 1
      ;;
    \?)
      usage
      exit 1
      ;;
  esac
done

# Parse the following patterns for repo urls to get the github repo url
# https://github.com/owner/repo-name.git
# git@github.com:owner/repo-name.git
BASE_URL="https://github.com/""$(git config --get remote.origin.url | sed 's/.*github\.com[/:]\(.*\).git/\1/')""/compare"

if [[ "$#" -eq 1 ]]; then
  if [[ "$1" =~ .*\.\..* ]]; then
    # Handle "git hubdiff fromcommit..tocommit"
    open "${BASE_URL}/$(git rev-parse "${1/\.\.*/}")...$(git rev-parse ${1/*\.\./})"
  else
    # Handle "git hubdiff fromcommit"
    open "${BASE_URL}/$(git rev-parse "$1")...$(git rev-parse HEAD)"
  fi
elif [[ "$#" -eq 2 ]]; then
  # Handle "git hubdiff fromcommit tocommit"
  open "${BASE_URL}/$(git rev-parse "$1")...$(git rev-parse "$2")"
fi