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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-buffer "*fmt stderr*"
"Buffer to send fmt-executable stderr to."
:type '(string)
:group 'fmt)
(defun fmt-current-buffer ()
(interactive)
(unless (executable-find fmt-executable t)
(error "failed to find fmt-executable: %s" fmt-executable))
(let ((stdout (get-buffer-create fmt-stdout-buffer))
(stderr (get-buffer-create fmt-stderr-buffer)))
(with-current-buffer stdout
(erase-buffer))
(let ((proc (make-process
:name (format "*%s*" fmt-executable)
:command `(,fmt-executable ,@fmt-args)
:buffer stdout
:stderr stderr
:file-handler t)))
(process-send-region proc (point-min) (point-max))
(process-send-eof proc)
(while (process-live-p proc)
(accept-process-output proc))
(if (zerop (process-exit-status proc))
(replace-buffer-contents stdout)
(error "failed to run formatter")))))
(provide 'fmt)
;;; fmt.el ends here
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