#!/usr/bin/env bash
set -euo pipefail

# Parse -L start,end
while [[ "${1:-}" == -* ]]; do
   case "$1" in
     -L) IFS=',' read -r start end <<< "$2"; shift 2 ;;
     *)  shift ;;
   esac
done

file="$1"

# Run git from the file's directory so it works with any CWD
root=$(git -C "$(dirname "$file")" rev-parse --show-toplevel)
hash=$(git -C "$(dirname "$file")" rev-parse HEAD)
remote=$(git -C "$(dirname "$file")" remote get-url origin)

# Normalise SSH or HTTPS remote → owner/repo
remote="${remote#git@github.com:}"
remote="${remote#https://github.com/}"
remote="${remote%.git}"

# Make file path relative to repo root
relpath="${file#$root/}"

# Build fragment: single line vs range
if [[ "$start" == "$end" ]]; then
   fragment="#L${start}"
else
   fragment="#L${start}-L${end}"
fi

url="https://github.com/${remote}/blob/${hash}/${relpath}${fragment}"

if command -v pbcopy &>/dev/null; then
  echo "$url" | pbcopy
elif command -v xclip &>/dev/null; then
  echo "$url" | xclip -selection clipboard
elif command -v xsel &>/dev/null; then
  echo "$url" | xsel --clipboard --input
fi
echo "$url"