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bug#4928: 23.1; lm-keywords more flexibility

From: Kevin Ryde
Subject: bug#4928: 23.1; lm-keywords more flexibility
Date: Sun, 15 Nov 2009 11:30:13 +1100
User-agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.1 (gnu/linux)

This is a idea to relax/extend lm-keywords to cope with multi-line
keywords, like say Drew's icicles.el,

  ;; Keywords: internal, extensions, help, abbrev, local, minibuffer,
  ;;           keys, apropos, completion, matching, regexp, command

And comma-only separators like say zenirc-color.el,

  ;; Keywords: zenirc,extensions

And trailing-space as in say vm-summary-faces.el, which had been ok in
Emacs 21.

  ;; Keywords:    VM 

2009-11-13  Kevin Ryde  <address@hidden>

        * emacs-lisp/lisp-mnt.el (lm-keywords): Allow multi-line keywords.
        (lm-keywords-list): Allow comma-only separator like "foo,bar".
        Ignore trailing spaces by omit-nulls to split-string (fixing
        regression from Emacs 21 due to the incompatible split-string

--- lisp-mnt.el.~1.63.~ 2009-10-08 11:00:31.000000000 +1100
+++ lisp-mnt.el 2009-11-15 11:27:05.000000000 +1100
@@ -445,16 +445,20 @@
            (match-string-no-properties 1)))))))
 (defun lm-keywords (&optional file)
-  "Return the keywords given in file FILE, or current buffer if FILE is nil."
+  "Return the keywords given in file FILE, or current buffer if FILE is nil.
+The return value is a `downcase'-ed string, or nil if no keywords
+header.  Multi-line keywords are joined up with a space between
+each line."
   (lm-with-file file
-    (let ((keywords (lm-header "keywords")))
-      (and keywords (downcase keywords)))))
+    (let ((keywords (lm-header-multiline "keywords")))
+      (and keywords
+          (mapconcat 'downcase keywords " ")))))
 (defun lm-keywords-list (&optional file)
   "Return list of keywords given in file FILE."
   (let ((keywords (lm-keywords file)))
     (if keywords
-       (split-string keywords ",?[ \t]"))))
+       (split-string keywords "[, \t\n]+" t))))
 (defvar finder-known-keywords)
 (defun lm-keywords-finder-p (&optional file)

In GNU Emacs 23.1.1 (i486-pc-linux-gnu, GTK+ Version 2.16.5)
 of 2009-09-14 on raven, modified by Debian
configured using `configure  '--build=i486-linux-gnu' '--host=i486-linux-gnu' 
'--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' 
'--localstatedir=/var/lib' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' 
 '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 
'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g 

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