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emacs-config/oni-ediff.el
Tom Willemse 48d513550d Add support to call ediff through emacsclient
This way Emacs can be used in Perforce, for example, as the diff program:

    Location: C:/msys64/mingw64/bin/emacsclientw.exe
    Arguments: diff %1 %2
2020-11-06 16:42:58 -08:00

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;;; oni-ediff.el --- Ediff configuration -*- lexical-binding: t; -*-
;; Copyright (C) 2019 Tom Willemse
;; Author: Tom Willemse <tom@ryuslash.org>
;; Keywords: local
;; Version: 2019.1010.164050
;; 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/>.
;;; Commentary:
;; Ediff configuration.
;;; Code:
(require 'ediff)
(defun oni-ediff--turn-on-fullscreen ()
"Turn on fullscreen for the current frame."
(unless (memq (frame-parameter nil 'fullscreen)
'(fullscreen fullboth))
(set-frame-parameter nil 'fullscreen 'fullboth)))
(defun oni-ediff--turn-off-fullscreen ()
"Turn off fullscreen for the current frame."
(when (memq (frame-parameter nil 'fullscreen)
'(fullscreen fullboth))
(set-frame-parameter nil 'fullscreen nil)))
;;;###autoload
(defun oni-ediff-from-command-line ()
"Call ediff with arguments from the command line."
(pcase command-line-args-left
(`(,fileA ,fileB) (ediff-files fileA fileB))
(`(,fileA ,fileB ,fileC) (ediff-files3 fileA fileB fileC))
(_ (error "Invalid number of arguments, need either 2 or 3 files"))))
;;;###autoload
(defun oni-ediff-server (fun files proc &optional nowait)
(pcase files
((and `((,fileB) (,fileA) (,command))
(guard (string= (file-name-nondirectory command) "diff")))
(select-frame-set-input-focus (selected-frame))
(ediff-files (expand-file-name fileA)
(expand-file-name fileB))
nil)
(_
(message "Got args: \"%s\"" (list files proc nowait))
(funcall fun files proc nowait))))
;;;###autoload
(advice-add 'server-visit-files :around #'oni-ediff-server)
(setq ediff-window-setup-function 'ediff-setup-windows-plain)
(setq ediff-split-window-function 'split-window-horizontally)
(setq ediff-diff-options "-w")
(add-hook 'ediff-mode-hook #'oni-ediff--turn-on-fullscreen)
(add-hook 'ediff-cleanup-hook #'oni-ediff--turn-off-fullscreen)
;;;###autoload(with-eval-after-load 'ediff (require 'oni-ediff))
(provide 'oni-ediff)
;;; oni-ediff.el ends here