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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)
(defun fmt--init-output-buffer (name)
(with-current-buffer (get-buffer-create name)
(erase-buffer)
(current-buffer)))
(defun fmt--wait-for-processes (processes)
(cl-loop for process in processes
do (cl-loop while (accept-process-output process))))
(defun fmt-process-current-buffer ()
(let* ((stdout-buffer (fmt--init-output-buffer "*fmt stdout*"))
(stderr-buffer (fmt--init-output-buffer "*fmt stderr*"))
(stderr (make-pipe-process
:name (format "%s stderr" fmt-executable)
:buffer stderr-buffer
:sentinel 'ignore
:noquery t))
(process (make-process
:name fmt-executable
:buffer stdout-buffer
:command (cons fmt-executable fmt-args)
:sentinel 'ignore
:noquery t
:connection-type 'pipe
:stderr stderr)))
(process-send-region process (point-min) (point-max))
(process-send-eof process)
(cons process stderr)))
(defun fmt-current-buffer ()
(interactive)
(pcase-let ((`(,process . ,stderr) (fmt-process-current-buffer)))
(fmt--wait-for-processes (list process stderr))
(if (zerop (process-exit-status process))
(replace-buffer-contents (process-buffer process))
(message "%s failed with exit status %s. See %s for output."
fmt-executable
(process-exit-status process)
(process-buffer stderr)))))
(provide 'fmt)
;;; fmt.el ends here
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