open

#!/bin/bash

# A script to open a webpage on any platform

set -eu

is_app_installed() {
  type "$1" &>/dev/null
}

# If we're called with an argument, open that, otherwise assume it's stdin
if [ "$#" -eq 0 ]; then
  echo "Reading from stdin. Enter the URL followed by EOF (Ctrl+D)."
  buf=$(cat "$@")
else
  buf=$1
fi

open_backend_remote_tunnel_port=$(tmux show-option -gvq "@open_backend_remote_tunnel_port")

# Resolve open backend: open (OSX), xdg-open (Linux)
open_backend=""
echo $0
if is_app_installed open && [ "$(which open)" != "$0" ]; then
  open_backend="open"
elif [ -n "${open_backend_remote_tunnel_port-}" ] && [ "$(ss -n -4 state listening "( sport = $open_backend_remote_tunnel_port )" | tail -n +2 | wc -l)" -eq 1 ]; then
  open_backend="base64 | nc -N localhost $open_backend_remote_tunnel_port"
elif [ -n "${DISPLAY-}" ] && is_app_installed xdg-open; then
  open_backend="xdg-open"
fi

# if open backend is resolved, open and exit
if [ -n "$open_backend" ]; then
  printf "%s" "$buf" | eval "$open_backend"
  exit;
else
  echo "No backend available. Ensure open or xdg-open is available, or the remote server is listening if using over SSH."
  exit 1
fi