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(view-emacs-news): Rewrite to support new NEWS,

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NEWS.major, and NEWS.1-17 file naming.  Add more intelligense,
e.g. version 10 matches 1.10, and don't be confused by version 1.1
begin a prefix of 1.12 (etc).  A numeric prefix arg also works.
This commit is contained in:
Kim F. Storm 2006-06-04 01:14:15 +00:00
parent 32a877bb67
commit e38cc268e2
1 changed files with 67 additions and 54 deletions
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121
lisp/help.el
View file

@ -326,63 +326,76 @@ of the key sequence that ran this command."
;; run describe-prefix-bindings.
(setq prefix-help-command 'describe-prefix-bindings)
(defun view-emacs-news (&optional arg)
(defun view-emacs-news (&optional version)
"Display info on recent changes to Emacs.
With argument, display info only for the selected version."
(interactive "P")
(if (not arg)
(view-file (expand-file-name "NEWS" data-directory))
(let* ((map (sort
(delete-dups
(apply
'nconc
(mapcar
(lambda (file)
(with-temp-buffer
(insert-file-contents
(expand-file-name file data-directory))
(let (res)
(while (re-search-forward
(if (string-match "^ONEWS\\.[0-9]+$" file)
"Changes in \\(?:Emacs\\|version\\)?[ \t]*\\([0-9]+\\(?:\\.[0-9]+\\)?\\)"
"^\* [^0-9\n]*\\([0-9]+\\.[0-9]+\\)") nil t)
(setq res (cons (list (match-string-no-properties 1)
file) res)))
res)))
(append '("NEWS" "ONEWS")
(directory-files data-directory nil
"^ONEWS\\.[0-9]+$" nil)))))
(lambda (a b)
(string< (car b) (car a)))))
(current (caar map))
(version (completing-read
(format "Read NEWS for the version (default %s): " current)
(mapcar 'car map) nil nil nil nil current))
(file (cadr (assoc version map)))
res)
(if (not file)
(error "No news is good news")
(view-file (expand-file-name file data-directory))
(widen)
(goto-char (point-min))
(when (re-search-forward
(concat (if (string-match "^ONEWS\\.[0-9]+$" file)
"Changes in \\(?:Emacs\\|version\\)?[ \t]*"
"^\* [^0-9\n]*") version)
nil t)
(beginning-of-line)
(narrow-to-region
(point)
(save-excursion
(while (and (setq res
(re-search-forward
(if (string-match "^ONEWS\\.[0-9]+$" file)
"Changes in \\(?:Emacs\\|version\\)?[ \t]*\\([0-9]+\\(?:\\.[0-9]+\\)?\\)"
"^\* [^0-9\n]*\\([0-9]+\\.[0-9]+\\)") nil t))
(equal (match-string-no-properties 1) version)))
(or res (goto-char (point-max)))
(beginning-of-line)
(point))))))))
(unless version
(setq version emacs-major-version))
(when (consp version)
(let* ((all-versions
(let (res)
(mapcar
(lambda (file)
(with-temp-buffer
(insert-file-contents
(expand-file-name file data-directory))
(while (re-search-forward
(if (member file '("NEWS.18" "NEWS.1-17"))
"Changes in \\(?:Emacs\\|version\\)?[ \t]*\\([0-9]+\\(?:\\.[0-9]+\\)?\\)"
"^\* [^0-9\n]*\\([0-9]+\\.[0-9]+\\)") nil t)
(setq res (cons (match-string-no-properties 1) res)))))
(cons "NEWS"
(directory-files data-directory nil
"^NEWS\\.[0-9][-0-9]*$" nil)))
(sort (delete-dups res) (lambda (a b) (string< b a)))))
(current (car all-versions))
res)
(setq version (completing-read
(format "Read NEWS for the version (default %s): " current)
all-versions nil nil nil nil current))
(if (integerp (string-to-number version))
(setq version (string-to-number version))
(unless (or (member version all-versions)
(<= (string-to-number version) (string-to-number current)))
(error "No news about version %s" version)))))
(when (integerp version)
(cond ((<= version 12)
(setq version (format "1.%d" version)))
((<= version 18)
(setq version (format "%d" version)))
((> version emacs-major-version)
(error "No news about emacs %d (yet)" version))))
(let* ((vn (if (stringp version)
(string-to-number version)
version))
(file (cond
((>= vn emacs-major-version) "NEWS")
((< vn 18) "NEWS.1-17")
(t (format "NEWS.%d" vn)))))
(view-file (expand-file-name file data-directory))
(widen)
(goto-char (point-min))
(when (stringp version)
(when (re-search-forward
(concat (if (< vn 19)
"Changes in Emacs[ \t]*"
"^\* [^0-9\n]*") version "$")
nil t)
(beginning-of-line)
(narrow-to-region
(point)
(save-excursion
(while (and (setq res
(re-search-forward
(if (< vn 19)
"Changes in \\(?:Emacs\\|version\\)?[ \t]*\\([0-9]+\\(?:\\.[0-9]+\\)?\\)"
"^\* [^0-9\n]*\\([0-9]+\\.[0-9]+\\)") nil t))
(equal (match-string-no-properties 1) version)))
(or res (goto-char (point-max)))
(beginning-of-line)
(point)))))))
(defun view-todo (&optional arg)
"Display the Emacs TODO list."