* lisp/format-spec.el (format-spec): Allow spec chars with nil values.

Fixes: debbugs:14420

2 files changed, 9 insertions, 4 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 8cc4a8876de..8fcd7424401 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+2013-05-20  Glenn Morris  <rgm@gnu.org>
+
+        * format-spec.el (format-spec): Allow spec chars with nil.  (Bug#14420)
+
 2013-05-19  Dmitry Gutov  <dgutov@yandex.ru>
 
         * progmodes/ruby-mode.el (ruby-expression-expansion-re): Allow to
diff --git a/lisp/format-spec.el b/lisp/format-spec.el
index 1280966d737..6bb0fe9178a 100644
--- a/lisp/format-spec.el
+++ b/lisp/format-spec.el
@@ -44,14 +44,15 @@ the text that it generates."
        ((looking-at "\\([-0-9.]*\\)\\([a-zA-Z]\\)")
         (let* ((num (match-string 1))
                (spec (string-to-char (match-string 2)))
-               (val (cdr (assq spec specification))))
+               (val (assq spec specification)))
           (unless val
             (error "Invalid format character: `%%%c'" spec))
+          (setq val (cdr val))
           ;; Pad result to desired length.
-          (let ((text (format (concat "%" num "s") val)))
+          (let ((text (format (concat "%" num "s") val)))
             ;; Insert first, to preserve text properties.
-            (insert-and-inherit text)
-            ;; Delete the specifier body.
+            (insert-and-inherit text)
+            ;; Delete the specifier body.
             (delete-region (+ (match-beginning 0) (length text))
                            (+ (match-end 0) (length text)))
             ;; Delete the percent sign.