Add and use fringe faces specific to diff-hl-dired

#25

diff-hl-dired.el

@@ -29,6 +29,26 @@
 
 (defvar diff-hl-dired-process-buffer nil)
 
+(defgroup diff-hl-dired nil
+  "VC diff highlighting on the side of a Dired window."
+  :group 'diff-hl)
+
+(defface diff-hl-dired-insert
+  '((default :inherit diff-hl-insert))
+  "Face used to highlight added files.")
+
+(defface diff-hl-dired-delete
+  '((default :inherit diff-hl-delete))
+  "Face used to highlight directories with deleted files.")
+
+(defface diff-hl-dired-change
+  '((default :inherit diff-hl-change))
+  "Face used to highlight changed files.")
+
+(defface diff-hl-dired-unknown
+  '((default :inherit diff-header))
+  "Face used to highlight unregistered files.")
+
 ;;;###autoload
 (define-minor-mode diff-hl-dired-mode
   "Toggle VC diff highlighting on the side of a Dired window."
@@ -91,10 +111,14 @@
         (when (and type (dired-goto-file-1
                          file (expand-file-name file) nil))
           (let* ((diff-hl-fringe-bmp-function 'diff-hl-fringe-bmp-from-type)
+                 (diff-hl-fringe-face-function 'diff-hl-dired-face-from-type)
                  (o (diff-hl-add-highlighting type 'single)))
             (overlay-put o 'modification-hooks '(diff-hl-overlay-modified))
             ))))))
 
+(defun diff-hl-dired-face-from-type (type _pos)
+  (intern (format "diff-hl-dired-%s" type)))
+
 (defalias 'diff-hl-dired-clear 'diff-hl-remove-overlays)
 
 (provide 'diff-hl-dired)

diff-hl.el

@@ -86,10 +86,6 @@
   "Face used to highlight changed lines."
   :group 'diff-hl)
 
-(defface diff-hl-unknown
-  '((default :inherit diff-header))
-  "Face used to highlight unregistered files.")
-
 (defcustom diff-hl-command-prefix (kbd "C-x v")
   "The prefix for all `diff-hl' commands."
   :group 'diff-hl
@@ -114,6 +110,12 @@
                  (const diff-hl-fringe-bmp-from-type)
                  function))
 
+(defcustom diff-hl-fringe-face-function 'diff-hl-fringe-face-from-type
+  "Function to choose the fringe face for a given change type
+  and position within a hunk.  Should accept two arguments."
+  :group 'diff-hl
+  :type 'function)
+
 (defvar diff-hl-reference-revision nil
   "Revision to diff against.  nil means the most recent one.")
 
@@ -166,12 +168,15 @@
   (let* ((key (list type pos diff-hl-fringe-bmp-function))
          (val (gethash key diff-hl-spec-cache)))
     (unless val
-      (let* ((face-sym (intern (format "diff-hl-%s" type)))
+      (let* ((face-sym (funcall diff-hl-fringe-face-function type pos))
              (bmp-sym (funcall diff-hl-fringe-bmp-function type pos)))
         (setq val (propertize " " 'display `((left-fringe ,bmp-sym ,face-sym))))
         (puthash key val diff-hl-spec-cache)))
     val))
 
+(defun diff-hl-fringe-face-from-type (type _pos)
+  (intern (format "diff-hl-%s" type)))
+
 (defun diff-hl-fringe-bmp-from-pos (_type pos)
   (intern (format "diff-hl-bmp-%s" pos)))