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;;; fmt.el --- -*- lexical-binding: t; -*-
;; Copyright (C) 2023 John Turner
;; Author: John Turner <notroot@gentoo-pc>
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
(defgroup fmt nil
"Format buffers using external programs such as rustfmt.")
(defcustom fmt-executable nil
"Formatter executable to use for formatting a buffer."
:local t
:type '(string)
:group 'fmt)
(defcustom fmt-args nil
"Args to use when running fmt-executable."
:local t
:type '(repeat string)
:group 'fmt)
(defcustom fmt-stdout-buffer "*fmt stdout*"
"Buffer to send fmt-executable stdout to."
:type '(string)
:group 'fmt)
(defcustom fmt-stderr-file "/dev/null"
"Buffer to send fmt-executable stderr to."
:type '(string)
:group 'fmt)
(defcustom fmt-before-format-hook nil
"Hooks to run before fmt-executable runs."
:type '(hook)
:group 'fmt)
(define-error 'fmt-failure "fmt-failure")
(defun fmt-buffer ()
(run-hooks 'fmt-before-format-hook)
(let ((exit-status (apply 'call-process-region `(,(point-min) ,(point-max) ,fmt-executable
nil ,(list fmt-stdout-buffer fmt-stderr-file)
nil ,@fmt-args))))
(if (zerop exit-status)
(replace-buffer-contents fmt-stdout-buffer)
(signal 'fmt-failure nil))))
(defun fmt-current-buffer ()
(interactive)
(condition-case _ (fmt-buffer)
('fmt-failure (message "%s failed, see %s for more details" fmt-executable fmt-stderr-buffer))))
;; hooks
(defun fmt-erase-stdout-buffer ()
(with-current-buffer (get-buffer-create fmt-stdout-buffer)
(erase-buffer)))
(defun fmt-erase-stderr-buffer ()
(with-current-buffer (get-buffer-create fmt-stderr-buffer)
(erase-buffer)))
(add-hook 'fmt-before-format-hook 'fmt-erase-stdout-buffer)
(add-hook 'fmt-before-format-hook 'fmt-erase-stderr-buffer)
(provide 'fmt)
;;; fmt.el ends here
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