#!/usr/bin/env bash

# Uses skim as an application launcher.
#
# Requires: skim, lnch

_do_sk() { sk --prompt='open > '; }

case $OSTYPE in
  darwin*)
    apps=$(find -L {,~}/Applications -iname '*.app' -maxdepth 2 -type d 2>/dev/null)
    cmds=$(compgen -c 2>/dev/null)
    cmd=$(printf '%s\n' "${apps[@]}" "${cmds[@]}" | sort -u | _do_sk)
    if [[ -z $cmd ]]; then
      exit
    elif [[ $cmd == sk-* ]]; then
      $cmd
    else
      if [[ $cmd == *.app ]]; then
        open "$cmd"
      elif ! command -v lnch >/dev/null; then
        >&2 echo "lnch not installed, run 'go get github.com/oem/lnch'"
        exit 1
      else
        # disowns the subprocess from the parent shell (i.e. if that shell
        # gets closed, the subprocess will survive).
        lnch "$cmd"
      fi
    fi
    ;;
  linux*)
    cmd=$(echo -n "$PATH" | xargs -d: -I{} -r -- find -L {} -maxdepth 1 -mindepth 1 -type f -executable -printf '%P\n' 2>/dev/null | sort -u | _do_sk)
    if [[ -z $cmd ]]; then
      exit
    elif [[ $cmd == sk-* ]]; then
      $cmd
    elif ! command -v lnch >/dev/null; then
      >&2 echo "lnch not installed, run 'go get github.com/oem/lnch'"
      exit 1
    else
      # disowns the subprocess from the parent shell (i.e. if that shell gets
      # closed, the subprocess will survive).
      lnch "$cmd"

      # OPTIONAL: requires shell/+tmux
      if command -v tmux-session-name >/dev/null; then
        # If this was used from a scratch tmux terminal, close it
        [[ "$(tmux-session-name)" == scratch ]] && tmux kill-session -t scratch
      fi
    fi
    ;;
esac