gh-link

#!/bin/bash

GITHUB_ROOT='https://github.com/'

FILE_PATH="$1"
LINE="$2"
REMOTE="${3:-origin}"
BRANCH="$(git rev-parse --abbrev-ref HEAD)"

usage() {
  echo 'Usage: gh-link FILE_PATH LINE_NUMBER [REMOTE_NAME]'
}

if [[ "$FILE_PATH" == '' ]]; then
  usage >&2
  exit 1
fi

if [[ "$LINE" == '' ]]; then
  usage >&2
  exit 2
fi

REPO_URL=$(git remote -v | grep -E "^$REMOTE" | head -n 1 | tr '\t' ' ' | tr -s ' ' | cut -d ' ' -f 2)
if ! echo "$REPO_URL" | grep -F 'git@github.com' &> /dev/null; then
  echo "Remote URL does not begin with git@github.com; I don't know how to generate a web link" >&2
  exit 3
fi

REPO="$(echo "$REPO_URL" | cut -d ':' -f 2 | sed -E 's/\.git$//')"

echo "$GITHUB_ROOT$REPO/blob/$BRANCH/$FILE_PATH#L$LINE"