Import No Gnus v0.4.

[elisp/gnus.git-] / lisp / format-spec.el

diff --git a/lisp/format-spec.el b/lisp/format-spec.el
index 1ffab56..aa290be 100644 (file)
--- a/lisp/format-spec.el
+++ b/lisp/format-spec.el
@@ -1,5 +1,7 @@
 ;;; format-spec.el --- functions for formatting arbitrary formatting strings
-;; Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+
+;; Copyright (C) 1999, 2000, 2002, 2003, 2004,
+;;   2005, 2006 Free Software Foundation, Inc.
 
 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
 ;; Keywords: tools
@@ -18,8 +20,8 @@
 
 ;; You should have received a copy of the GNU General Public License
 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
 
 ;;; Commentary:
 
@@ -31,7 +33,8 @@
   "Return a string based on FORMAT and SPECIFICATION.
 FORMAT is a string containing `format'-like specs like \"bash %u %k\",
 while SPECIFICATION is an alist mapping from format spec characters
-to values."
+to values.  Any text properties on a %-spec itself are propagated to
+the text that it generates."
   (with-temp-buffer
     (insert format)
     (goto-char (point-min))
@@ -45,10 +48,17 @@ to values."
        (let* ((num (match-string 1))
               (spec (string-to-char (match-string 2)))
               (val (cdr (assq spec specification))))
-         (delete-region (1- (match-beginning 0)) (match-end 0))
          (unless val
-           (error "Invalid format character: `%%%c'" spec))
-         (insert (format (concat "%" num "s") val))))
+           (error "Invalid format character: `%%%c'" spec))
+         ;; Pad result to desired length.
+          (let ((text (format (concat "%" num "s") val)))
+           ;; Insert first, to preserve text properties.
+            (insert-and-inherit text)
+            ;; Delete the specifier body.
+            (delete-region (+ (match-beginning 0) (length text))
+                           (+ (match-end 0) (length text)))
+            ;; Delete the percent sign.
+            (delete-region (1- (match-beginning 0)) (match-beginning 0)))))
        ;; Signal an error on bogus format strings.
        (t
        (error "Invalid format string"))))