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113 lines
4.1 KiB
113 lines
4.1 KiB
;;; gulp-task-runner.el --- Gulp task runner -*- lexical-binding: t; -*-
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;; Copyright (C) 2016, 2017 Nicolas Petton
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;; Author: Nicolas Petton <nicolas@petton.fr>
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;; Keywords: convenience, javascript
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;; Version: 1.0
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;; Package: gulp-task-runner
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Run `M-x gulp' to choose a task from the list of Gulp tasks and run it.
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;;; Code:
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(defvar gulp--task-cache nil
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"Map gulpfile path to the list of its tasks.")
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;;;###autoload
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(defun gulp (&optional prefix)
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"Prompt for a gulp task and run it.
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With PREFIX or when called interactively with a prefix argument,
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forces reload of the task list from gulpfile.js."
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(interactive "P")
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(when prefix
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(gulp--invalidate-cache))
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(let* ((gulpfile (or (gulp--current-gulpfile)
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(gulp--gulpfile-from-cache)))
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(gulp-bin (executable-find "gulp")))
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(if gulpfile
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(gulp--run-gulpfile gulpfile gulp-bin)
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(warn "No gulpfile to get the tasks from"))))
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(defun gulp--run-gulpfile (gulpfile gulp-bin)
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"Let the user choose a task from GULPFILE and run it."
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(let* ((tasks (gulp--get-tasks gulpfile gulp-bin))
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(task (completing-read "Gulp task: " tasks)))
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;; Use a temporary buffer to change current directory
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(with-temp-buffer
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(cd (file-name-directory gulpfile))
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(let ((compilation-buffer-name-function #'gulp--get-buffer-name))
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(compilation-start (format "%s %s" gulp-bin task))))))
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(defun gulp--add-to-cache (gulpfile tasks)
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"Add (GULPFILE TASKS) to `gulp--task-cache'."
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;; because we are using alist functions, there is no need to erase
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;; pairs with same key
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(setq gulp--task-cache
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(cons (cons gulpfile tasks)
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gulp--task-cache)))
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(defun gulp--invalidate-cache (&optional gulpfile)
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"Remove cached task list for GULPFILE.
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If GULPFILE is nil, remove task list for `gulp--current-gulpfile'."
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(let ((gulpfile (or gulpfile (gulp--current-gulpfile))))
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(gulp--add-to-cache gulpfile nil)))
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(defun gulp--current-gulpfile (&optional dir)
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"Return path of the gulpfile from DIR or `default-directory'."
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(let* ((dir (or dir default-directory))
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(gulpfile (locate-dominating-file (or dir default-directory)
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"gulpfile.js")))
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(when gulpfile
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(expand-file-name "gulpfile.js" gulpfile))))
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(defun gulp--get-tasks-from-gulp (gulp-bin)
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"Ask gulp for a task list."
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(process-lines gulp-bin "--tasks-simple"))
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(defun gulp--get-tasks-from-cache (&optional gulpfile)
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"Lookup for a task list for GULPFILE in `gulp--task-cache'.
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If GULPFILE is absent, its value is takend from
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`gulp--current-gulpfile'."
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(let ((gulpfile (or gulpfile (gulp--current-gulpfile))))
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(cdr (assoc gulpfile gulp--task-cache))))
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(defun gulp--get-gulpfiles-from-cache ()
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"Return a list of all gulpfiles in `gulp--task-cache'."
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(mapcar #'car gulp--task-cache))
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(defun gulp--gulpfile-from-cache ()
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"Let the user choose a gulpfile from the cache."
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(let ((gulpfiles (gulp--get-gulpfiles-from-cache)))
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(when gulpfiles
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(completing-read "Choose a gulpfile: " gulpfiles))))
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(defun gulp--get-tasks (gulpfile gulp-bin)
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"Return a list of gulp tasks for GULPFILE.
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Either use `gulp--task-cache' or run gulp to get the tasks."
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(or (gulp--get-tasks-from-cache gulpfile)
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(let ((tasks (gulp--get-tasks-from-gulp gulp-bin)))
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(gulp--add-to-cache gulpfile tasks)
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tasks)))
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(defun gulp--get-buffer-name (&rest _)
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"Return the name of a gulp task buffer."
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"*gulp*")
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(provide 'gulp-task-runner)
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;;; gulp-task-runner.el ends here
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