#!/bin/sh
##
## SPDX-FileCopyrightText: 2023 Benjamin Grande M. S. <ben.grande.b@gmail.com>
##
## SPDX-License-Identifier: AGPL-3.0-or-later
##
##
## Tmux Sorcerer - source Tmux plugins like a wizard
##
## If multiple arguments are present, try them all.
## In the absence of an argument, the script will try to find a 'plugin'
##   directory at the defaults Tmux configuration directory in the following
##   order (stops at first match):
##    - ${XDG_CONFIG_HOME-$HOME/.config}/tmux/plugins
##    - $HOME/.tmux/plugins
##
## Note '@plugin' definition is only useful for TPM, this script will source
##   all plugins that are found. If you want to deactivate a plugin, move the
##   directory to outside of the base of plugins directory.
##
## Tmux configuration (add to the bottom of the file):
##   run-shell 'command -v tmux-sorcerer >/dev/null' 'tmux-sorcerer'
##
## Usage: tmux-sorcerer [PLUGIN_DIR] [PLUGIN_DIR2...]
## Example:
##   tmux-sorcerer
##   tmux-sorcerer ~/src/tmux/my-plugins ~/private/tmux/my-bundle
##
set -eu

get_plugin_path(){
  xdg_file="${XDG_CONFIG_HOME-$HOME/.config}/tmux/tmux.conf"
  home_subdir_file="$HOME/.tmux/tmux.conf"
  if test -f "$xdg_file"; then
    plugin_base="${xdg_file%/tmux.conf}/plugins"
    return 0
  elif test -f "$home_subdir_file"; then
    plugin_base="${home_subdir_file%/tmux.conf}/plugins"
    return 0
  fi
  return 1
}

set_plugin_path(){
  while true; do
    test -n "${1-}" || break
    cur_arg="$1"; shift
    case "$cur_arg" in
      "")
        break
        ;;
      *)
        test -d "$cur_arg" || continue
        if test -n "${plugin_base-}"; then
          plugin_base="${plugin_base-} $cur_arg"; continue
        else
          plugin_base="$cur_arg"; continue
        fi
        ;;
    esac
  done
}

source_plugins(){
  directory="$1"
  ## See shellcheck SC2044 to understand why loops over find are fragile.
  find "$directory" -maxdepth 1 -type d -not -name "$(printf "*\n*")" | \
    while read -r plugin
  do
    plugin_name="${plugin##*/}"
    plugin_name="${plugin_name##tmux-}"
    plugin_name="$(echo "${plugin_name}" | tr "-" "_")"
    plugin_script="$plugin/$plugin_name.tmux"
    test -r "$plugin_script" || continue
    "$plugin_script" >/dev/null 2>&1
  done
}

plugin_base=""
command -v tmux >/dev/null || exit 1
if test -n "${1-}"; then
  set_plugin_path "$@"
else
  get_plugin_path || exit 1
fi

## Don't fail if not directory was found
test -n "${plugin_base-}" || exit 0

for p in ${plugin_base}; do
  test -d "$p" || continue
  source_plugins "$p"
done

exit