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(format-spec): Propagate text properties of % spec.

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This commit is contained in:
Richard M. Stallman 2005-10-09 15:37:35 +00:00
parent 865729da26
commit 827d67f3b6
1 changed files with 11 additions and 3 deletions
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14
lisp/gnus/format-spec.el
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@ -33,7 +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))
@ -47,10 +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: %s" spec))
(insert (format (concat "%" num "s") val))))
;; 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"))))