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;;; svn-entries.el --- Display .svn/entries field names to the left
;; Copyright (C) 2007 David Glasser
;; Licensed under the same license as Subversion.
;; Licensed to the Apache Software Foundation (ASF) under one
;; or more contributor license agreements. See the NOTICE file
;; distributed with this work for additional information
;; regarding copyright ownership. The ASF licenses this file
;; to you under the Apache License, Version 2.0 (the
;; "License"); you may not use this file except in compliance
;; with the License. You may obtain a copy of the License at
;;
;; http://www.apache.org/licenses/LICENSE-2.0
;;
;; Unless required by applicable law or agreed to in writing,
;; software distributed under the License is distributed on an
;; "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
;; KIND, either express or implied. See the License for the
;; specific language governing permissions and limitations
;; under the License.
;;; Commentary:
;; Display field names to the left of the lines in a .svn/entries
;; buffer. Copy svn-entries.el to your load-path and add to your
;; .emacs:
;; (require 'svn-entries)
;; After opening or editing an entries file, run
;; M-x svn-entries-show
;; To hide:
;; M-x svn-entries-hide
;; (I tried doing this as a minor mode but setting margins during
;; alist initialization didn't work...)
;; Tested on FSF Emacs 22.
(defvar svn-entries-overlays nil "Overlays used in this buffer.")
(make-variable-buffer-local 'svn-entries-overlays)
(defgroup svn-entries nil
"Show labels to the left of .svn/entries buffers"
:group 'convenience)
(defface svn-entries
'((t :inherit shadow))
"Face for displaying line numbers in the display margin."
:group 'svn-entries)
(defun svn-entries-set-margins (buf margin)
(dolist (w (get-buffer-window-list buf nil t))
(set-window-margins w margin)))
(defun svn-entries-hide ()
"Delete all overlays displaying labels for this buffer."
(interactive)
(mapc #'delete-overlay svn-entries-overlays)
(setq svn-entries-overlays nil)
(svn-entries-set-margins (current-buffer) 0)
(remove-hook 'window-configuration-change-hook
'svn-entries-after-config t))
(defun svn-entries-show ()
"Update labels for the current buffer."
(interactive)
(svn-entries-update (current-buffer))
(add-hook 'window-configuration-change-hook
'svn-entries-after-config nil t))
(defconst svn-entries-labels
["name"
"kind"
"revision"
"url"
"repos"
"schedule"
"text-time"
"checksum"
"committed-date"
"committed-rev"
"last-author"
"has-props"
"has-prop-mods"
"cachable-props"
"present-props"
"conflict-old"
"conflict-new"
"conflict-wrk"
"prop-reject-file"
"copied"
"copyfrom-url"
"copyfrom-rev"
"deleted"
"absent"
"incomplete"
"uuid"
"lock-token"
"lock-owner"
"lock-comment"
"lock-creation-date"
"changelist"
"keep-local"
"working-size"
"depth"])
(defconst svn-entries-margin-width (length "lock-creation-date"))
(defun svn-entries-update (buffer)
"Update labels for all windows displaying BUFFER."
(with-current-buffer buffer
(svn-entries-hide)
(save-excursion
(save-restriction
(widen)
(let ((last-line (line-number-at-pos (point-max)))
(field 0)
(done nil))
(goto-char (point-min))
(while (not done)
(cond ((= (point) 1)
(svn-entries-overlay-here "format"))
((= (following-char) 12) ; ^L
(setq field 0))
((not (eobp))
(svn-entries-overlay-here (elt svn-entries-labels field))
(setq field (1+ field))))
(setq done (> (forward-line) 0))))))
(svn-entries-set-margins buffer svn-entries-margin-width)))
(defun svn-entries-overlay-here (label)
(let* ((fmt-label (propertize label 'face 'svn-entries))
(left-label (propertize " " 'display `((margin left-margin)
,fmt-label)))
(ov (make-overlay (point) (point))))
(push ov svn-entries-overlays)
(overlay-put ov 'before-string left-label)))
(defun svn-entries-after-config ()
(walk-windows (lambda (w) (svn-entries-set-margins-if-overlaid (window-buffer)))
nil 'visible))
(defun svn-entries-set-margins-if-overlaid (b)
(with-current-buffer b
(when svn-entries-overlays
(svn-entries-set-margins b svn-entries-margin-width))))
(provide 'svn-entries)
;;; svn-entries.el ends here
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