;;; diff-hl-margin.el --- Highlight buffer changes on margins -*- lexical-binding: t -*-
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;; Copyright (C) 2012-2017 Free Software Foundation, Inc.
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;; This file is part of GNU Emacs.
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;; GNU Emacs 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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;; GNU Emacs 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This is a global mode, it modifies `diff-hl-mode' to use the margin
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;; instead of the fringe. To toggle, type `M-x diff-hl-margin-mode'.
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;;
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;; Compared to the default behavior, this makes `diff-hl-mode'
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;; indicators show up even when Emacs is running in a terminal.
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;;
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;; On the flip side, the indicators look simpler, and they are
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;; incompatible with `linum-mode' or any other mode that uses the
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;; margin.
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;;
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;; You might want to enable it conditionally in your init file
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;; depending on whether Emacs is running in graphical mode:
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;;
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;; (unless (window-system) (diff-hl-margin-mode))
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(require 'cl-lib)
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(require 'diff-hl)
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(require 'diff-hl-dired)
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(defvar diff-hl-margin-old-highlight-function nil)
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(defgroup diff-hl-margin nil
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"Highlight buffer changes on margin"
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:group 'diff-hl)
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(defface diff-hl-margin-insert
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'((default :inherit diff-hl-insert))
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"Face used to highlight inserted lines on the margin.")
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(defface diff-hl-margin-delete
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'((default :inherit diff-hl-delete))
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"Face used to highlight deleted lines on the margin.")
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(defface diff-hl-margin-change
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'((default :inherit diff-hl-change))
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"Face used to highlight changed lines on the margin.")
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(defface diff-hl-margin-ignored
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'((default :inherit dired-ignored))
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"Face used to highlight changed lines on the margin.")
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(defface diff-hl-margin-unknown
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'((default :inherit dired-ignored))
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"Face used to highlight changed lines on the margin.")
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(defcustom diff-hl-margin-symbols-alist
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'((insert . "+") (delete . "-") (change . "!")
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(unknown . "?") (ignored . "i"))
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"Associative list from symbols to strings."
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:type '(alist :key-type symbol
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:value-type string
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:options (insert delete change unknown ignored))
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:set (lambda (symbol value)
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(defvar diff-hl-margin-spec-cache)
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(set-default symbol value)
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(setq diff-hl-margin-spec-cache nil)))
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;;;###autoload
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(define-minor-mode diff-hl-margin-mode
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"Toggle displaying `diff-hl-mode' highlights on the margin."
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:lighter "" :global t
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(if diff-hl-margin-mode
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(progn
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(add-hook 'diff-hl-mode-on-hook 'diff-hl-margin-minor-mode)
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(add-hook 'diff-hl-mode-off-hook 'diff-hl-margin-minor-mode-off)
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(add-hook 'diff-hl-dired-mode-on-hook 'diff-hl-margin-minor-mode)
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(add-hook 'diff-hl-dired-mode-off-hook 'diff-hl-margin-minor-mode-off))
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(remove-hook 'diff-hl-mode-on-hook 'diff-hl-margin-minor-mode)
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(remove-hook 'diff-hl-mode-off-hook 'diff-hl-margin-minor-mode-off)
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(remove-hook 'diff-hl-dired-mode-on-hook 'diff-hl-margin-minor-mode)
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(remove-hook 'diff-hl-dired-mode-off-hook 'diff-hl-margin-minor-mode-off))
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(dolist (buf (buffer-list))
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(with-current-buffer buf
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(cond
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(diff-hl-mode
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(diff-hl-margin-minor-mode (if diff-hl-margin-mode 1 -1))
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(diff-hl-update))
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(diff-hl-dired-mode
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(diff-hl-margin-minor-mode (if diff-hl-margin-mode 1 -1))
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(diff-hl-dired-update))))))
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(define-minor-mode diff-hl-margin-minor-mode
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"Toggle displaying `diff-hl-mode' highlights on the margin locally.
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You probably shouldn't use this function directly."
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:lighter ""
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(let ((width-var (intern (format "%s-margin-width" diff-hl-side))))
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(if diff-hl-margin-minor-mode
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(progn
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(set (make-local-variable 'diff-hl-margin-old-highlight-function)
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diff-hl-highlight-function)
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(set (make-local-variable 'diff-hl-highlight-function)
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'diff-hl-highlight-on-margin)
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(set width-var 1))
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(setq diff-hl-highlight-function diff-hl-margin-old-highlight-function
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diff-hl-margin-old-highlight-function nil)
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(set width-var 0)))
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(dolist (win (get-buffer-window-list))
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(set-window-buffer win (current-buffer))))
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(define-obsolete-variable-alias 'diff-hl-margin-side 'diff-hl-side "1.7.1")
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(defun diff-hl-margin-minor-mode-off ()
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(diff-hl-margin-minor-mode -1))
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(defvar diff-hl-margin-spec-cache nil)
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(defun diff-hl-margin-spec-cache ()
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(or diff-hl-margin-spec-cache
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(setq diff-hl-margin-spec-cache
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(diff-hl-margin-build-spec-cache))))
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(defun diff-hl-margin-build-spec-cache ()
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(cl-loop for (type . char) in diff-hl-margin-symbols-alist
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nconc
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(cl-loop for side in '(left right)
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collect
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(cons
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(cons type side)
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(propertize
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" " 'display
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`((margin ,(intern (format "%s-margin" side)))
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,(propertize char 'face
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(intern (format "diff-hl-margin-%s" type)))))))))
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(defun diff-hl-highlight-on-margin (ovl type _shape)
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(let ((spec (cdr (assoc (cons type diff-hl-side)
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(diff-hl-margin-spec-cache)))))
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(overlay-put ovl 'before-string spec)))
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(provide 'diff-hl-margin)
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;;; diff-hl-margin.el ends here
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