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emacs/lisp/quickurl.el
Gerd Moellmann b07ea410a3 (quickurl-list-insert): `count-lines' was returning 
a value one line to high if the cursor wasn't at the start of a
line. A `beginning-of-line' is now performed before making the
call to `count-lines'.
1999-10-12 11:48:43 +00:00

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;;; quickurl.el --- Insert an URL based on text at point in buffer.
;; Copyright (C) 1999 Free Software Foundation, Inc.
;; Author: Dave Pearson <davep@hagbard.demon.co.uk>
;; Maintainer: Dave Pearson <davep@hagbard.demon.co.uk>
;; Created: 1999-05-28
;; Keywords: hypermedia
;; This file is part of GNU emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; 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.
;;; Commentary:
;;
;; This package provides a simple method of inserting an URL based on the
;; text at point in the current buffer. This is part of an on-going effort
;; to increase the information I provide people while reducing the ammount
;; of typing I need to do. No-doubt there are undiscovered Emacs packages
;; out there that do all of this and do it better, feel free to point me to
;; them, in the mean time I'm having fun playing with Emacs Lisp.
;;
;; The URLs are stored in an external file as a list of either cons cells,
;; or lists. A cons cell entry looks like this:
;;
;; (<Lookup> . <URL>)
;;
;; where <Lookup> is a string that acts as the keyword lookup and <URL> is
;; the URL associated with it. An example might be:
;;
;; ("GNU" . "http://www.gnu.org/")
;;
;; A list entry looks like:
;;
;; (<Lookup> <URL> <Comment>)
;;
;; where <Lookup> and <URL> are the same as with the cons cell and <Comment>
;; is any text you like that describes the URL. This description will be
;; used when presenting a list of URLS using `quickurl-list'. An example
;; might be:
;;
;; ("FSF" "http://www.fsf.org/" "The Free Software Foundation")
;;
;; Given the above, your quickurl file might look like:
;;
;; (("GNU" . "http://www.gnu.org/")
;; ("FSF" "http://www.fsf.org/" "The Free Software Foundation")
;; ("emacs" . "http://www.emacs.org/")
;; ("hagbard" "http://www.hagbard.demon.co.uk" "Hagbard's World"))
;;
;; In case you're wondering about the mixture of cons cells and lists,
;; quickurl started life using just the cons cells, there were no comments.
;; URL comments are a later addition and so there is a mixture to keep
;; backward compatibility with existing URL lists.
;;
;; The name and location of the file is up to you, the default name used by
;; `quickurl' is stored in `quickurl-url-file'.
;;
;; quickurl is always available from:
;;
;; <URL:http://www.hagbard.demon.co.uk/archives/quickurl.el>
;; <URL:http://www.acemake.com/hagbard/archives/quickurl.el>
;;; TODO:
;;
;; o The quickurl-browse-url* functions pretty much duplicate their non
;; browsing friends. It would feel better if a more generic solution could
;; be found.
;;; Code:
;; Things we need:
(eval-when-compile
(require 'cl))
(require 'thingatpt)
(require 'pp)
(require 'browse-url)
;; Attempt to handle older/other emacs.
(eval-and-compile
;; If customize isn't available just use defvar instead.
(unless (fboundp 'defgroup)
(defmacro defgroup (&rest rest) nil)
(defmacro defcustom (symbol init docstring &rest rest)
`(defvar ,symbol ,init ,docstring))))
;; Customize options.
(defgroup quickurl nil
"Insert an URL based on text at point in buffer."
:group 'abbrev
:prefix "quickurl-")
(defcustom quickurl-url-file "~/.quickurls"
"*File that contains the URL list."
:type 'file
:group 'quickurl)
(defcustom quickurl-format-function (lambda (url) (format "<URL:%s>" url))
"*Function to format the URL before insertion into the current buffer."
:type 'function
:group 'quickurl)
(defcustom quickurl-sort-function (lambda (list)
(sort list
(lambda (x y)
(string<
(downcase (quickurl-url-description x))
(downcase (quickurl-url-description y))))))
"*Function to sort the URL list."
:type 'function
:group 'quickurl)
(defcustom quickurl-grab-lookup-function #'current-word
"*Function to grab the thing to lookup."
:type 'function
:group 'quickurl)
(defcustom quickurl-assoc-function #'assoc-ignore-case
"*Function to use for alist lookup into `quickurl-urls'."
:type 'function
:group 'quickurl)
(defcustom quickurl-prefix ";; -*- lisp -*-\n\n"
"*Text to write to `quickurl-url-file' before writing the URL list."
:type 'string
:group 'quickurl)
(defcustom quickurl-postfix ""
"*Text to write to `quickurl-url-file' after writing the URL list.
See the constant `quickurl-reread-hook-postfix' for some example text that
could be used here."
:type 'string
:group 'quickurl)
(defcustom quickurl-list-mode-hook nil
"*Hooks for `quickurl-list-mode'."
:type 'hook
:group 'quickurl)
;; Constants.
;;;###autoload
(defconst quickurl-reread-hook-postfix
"
;; Local Variables:
;; eval: (progn (require 'quickurl) (add-hook 'local-write-file-hooks (lambda () (quickurl-read) nil)))
;; End:
"
"Example `quickurl-postfix' text that adds a local variable to the
`quickurl-url-file' so that if you edit it by hand it will ensure that
`quickurl-urls' is updated with the new URL list.
To make use of this do something like:
(setq quickurl-postfix quickurl-reread-hook-postfix)
in your ~/.emacs (after loading/requiring quickurl).")
;; Non-customize variables.
(defvar quickurl-urls nil
"URL alist for use with `quickurl' and `quickurl-ask'.")
(defvar quickurl-list-mode-map nil
"Local keymap for a `quickurl-list-mode' buffer.")
(defvar quickurl-list-buffer-name "*quickurl-list*"
"Name for the URL listinig buffer.")
(defvar quickurl-list-last-buffer nil
"`current-buffer' when `quickurl-list' was called.")
;; Functions for working with an URL entry.
(defun quickurl-url-commented-p (url)
"Does the URL have a comment?"
(listp (cdr url)))
(defun quickurl-make-url (keyword url &optional comment)
"Create an URL from KEYWORD, URL and (optionaly) COMMENT."
(if (and comment (not (zerop (length comment))))
(list keyword url comment)
(cons keyword url)))
(defun quickurl-url-keyword (url)
"Return the keyword for the URL.
Note that this function is a setfable place."
(car url))
(defsetf quickurl-url-keyword (url) (store)
`(setf (car ,url) ,store))
(defun quickurl-url-url (url)
"Return the actual URL of the URL.
Note that this function is a setfable place."
(if (quickurl-url-commented-p url)
(cadr url)
(cdr url)))
(defsetf quickurl-url-url (url) (store)
`
(if (quickurl-url-commented-p ,url)
(setf (cadr ,url) ,store)
(setf (cdr ,url) ,store)))
(defun quickurl-url-comment (url)
"Get the comment from an URL.
If the URL has no comment an empty string is returned. Also note that this
function is a setfable place."
(if (quickurl-url-commented-p url)
(nth 2 url)
""))
(defsetf quickurl-url-comment (url) (store)
`
(if (quickurl-url-commented-p ,url)
(if (zerop (length ,store))
(setf (cdr ,url) (cadr ,url))
(setf (nth 2 ,url) ,store))
(unless (zerop (length ,store))
(setf (cdr ,url) (list (cdr ,url) ,store)))))
(defun quickurl-url-description (url)
"Return a description for the URL.
If the URL has a comment then this is returned, otherwise the keyword is
returned."
(let ((desc (quickurl-url-comment url)))
(if (zerop (length desc))
(quickurl-url-keyword url)
desc)))
;; Main code:
(defun* quickurl-read (&optional (buffer (current-buffer)))
"`read' the URL list from BUFFER into `quickurl-urls'.
Note that this function moves point to `point-min' before doing the `read'
It also restores point after the `read'."
(save-excursion
(setf (point) (point-min))
(setq quickurl-urls (funcall quickurl-sort-function (read buffer)))))
(defun quickurl-load-urls ()
"Load the contents of `quickurl-url-file' into `quickurl-urls'."
(when (file-exists-p quickurl-url-file)
(with-temp-buffer
(insert-file-contents quickurl-url-file)
(quickurl-read))))
(defun quickurl-save-urls ()
"Save the contents of `quickurl-urls' to `quickurl-url-file'."
(with-temp-buffer
(let ((standard-output (current-buffer)))
(princ quickurl-prefix)
(pp quickurl-urls)
(princ quickurl-postfix)
(write-region (point-min) (point-max) quickurl-url-file nil 0))))
(defun quickurl-find-url (lookup)
"Return URL associated with key LOOKUP.
The lookup is done by looking in the alist `quickurl-urls' and the `cons'
for the URL is returned. The actual method used to look into the alist
depends on the setting of the variable `quickurl-assoc-function'."
(funcall quickurl-assoc-function lookup quickurl-urls))
(defun quickurl-insert (url &optional silent)
"Insert URL, formatted using `quickurl-format-function'.
Also display a `message' saying what the URL was unless SILENT is non-nil."
(insert (funcall quickurl-format-function (quickurl-url-url url)))
(unless silent
(message "Found %s" (quickurl-url-url url))))
;;;###autoload
(defun* quickurl (&optional (lookup (funcall quickurl-grab-lookup-function)))
"Insert an URL based on LOOKUP.
If not supplied LOOKUP is taken to be the word at point in the current
buffer, this default action can be modifed via
`quickurl-grab-lookup-function'."
(interactive)
(when lookup
(quickurl-load-urls)
(let ((url (quickurl-find-url lookup)))
(if (null url)
(error "No URL associated with \"%s\"" lookup)
(when (looking-at "\\w")
(skip-syntax-forward "\\w"))
(insert " ")
(quickurl-insert url)))))
;;;###autoload
(defun quickurl-ask (lookup)
"Insert an URL, with `completing-read' prompt, based on LOOKUP."
(interactive
(list
(progn
(quickurl-load-urls)
(completing-read "Lookup: " quickurl-urls nil t))))
(let ((url (quickurl-find-url lookup)))
(when url
(quickurl-insert url))))
(defun quickurl-grab-url ()
"Attempt to grab a word/url pair from point in the current buffer.
Point should be somewhere on the URL and the word is taken to be the thing
that is returned from calling `quickurl-grab-lookup-function' once a
`backward-word' has been issued at the start of the URL.
It is assumed that the URL is either \"unguarded\" or is wrapped inside an
<URL:...> wrapper."
(let ((url (thing-at-point 'url)))
(when url
(save-excursion
(beginning-of-thing 'url)
;; `beginning-of-thing' doesn't take you to the start of a marked-up
;; URL, only to the start of the URL within the "markup". So, we
;; need to do a little more work to get to where we want to be.
(when (thing-at-point-looking-at thing-at-point-markedup-url-regexp)
(search-backward "<URL:"))
(backward-word 1)
(let ((word (funcall quickurl-grab-lookup-function)))
(when word
(quickurl-make-url
;; The grab function may return the word with properties. I don't
;; want the properties. I couldn't find a method of stripping
;; them from a "string" so this will have to do. If you know of
;; a better method of doing this I'd love to know.
(with-temp-buffer
(insert word)
(buffer-substring-no-properties (point-min) (point-max)))
url)))))))
;;;###autoload
(defun quickurl-add-url (word url comment)
"Allow the user to interactively add a new URL associated with WORD.
See `quickurl-grab-url' for details on how the default word/url combination
is decided."
(interactive (let ((word-url (quickurl-grab-url)))
(list (read-string "Word: " (quickurl-url-keyword word-url))
(read-string "URL: " (quickurl-url-url word-url))
(read-string "Comment: " (quickurl-url-comment word-url)))))
(if (zerop (length word))
(error "You must specify a WORD for lookup")
(quickurl-load-urls)
(let* ((current-url (quickurl-find-url word))
(add-it (if current-url
(if (interactive-p)
(y-or-n-p (format "\"%s\" exists, replace URL? " word))
t)
t)))
(when add-it
(if current-url
(progn
(setf (quickurl-url-url current-url) url)
(setf (quickurl-url-comment current-url) comment))
(push (quickurl-make-url word url comment) quickurl-urls))
(setq quickurl-urls (funcall quickurl-sort-function quickurl-urls))
(quickurl-save-urls)
(when (get-buffer quickurl-list-buffer-name)
(quickurl-list-populate-buffer))
(when (interactive-p)
(message "Added %s" url))))))
;;;###autoload
(defun* quickurl-browse-url (&optional (lookup (funcall quickurl-grab-lookup-function)))
"Browse the URL associated with LOOKUP.
If not supplied LOOKUP is taken to be the word at point in the
current buffer, this default action can be modifed via
`quickurl-grab-lookup-function'."
(interactive)
(when lookup
(quickurl-load-urls)
(let ((url (quickurl-find-url lookup)))
(if url
(browse-url (quickurl-url-url url))
(error "No URL associated with \"%s\"" lookup)))))
;;;###autoload
(defun quickurl-browse-url-ask (lookup)
"Browse the URL, with `completing-read' prompt, associated with LOOKUP."
(interactive (list
(progn
(quickurl-load-urls)
(completing-read "Browse: " quickurl-urls nil t))))
(let ((url (quickurl-find-url lookup)))
(when url
(browse-url (quickurl-url-url url)))))
;;;###autoload
(defun quickurl-edit-urls ()
"Pull `quickurl-url-file' into a buffer for hand editing."
(interactive)
(find-file quickurl-url-file))
;; quickurl-list mode.
(unless quickurl-list-mode-map
(let ((map (make-sparse-keymap)))
(suppress-keymap map t)
(define-key map "a" #'quickurl-list-add-url)
(define-key map [(control m)] #'quickurl-list-insert-url)
(define-key map "u" #'quickurl-list-insert-naked-url)
(define-key map " " #'quickurl-list-insert-with-lookup)
(define-key map "l" #'quickurl-list-insert-lookup)
(define-key map "d" #'quickurl-list-insert-with-desc)
(define-key map [(control g)] #'quickurl-list-quit)
(define-key map "q" #'quickurl-list-quit)
(define-key map [mouse-2] #'quickurl-list-mouse-select)
(define-key map "?" #'describe-mode)
(setq quickurl-list-mode-map map)))
(put 'quickurl-list-mode 'mode-class 'special)
;;;###autoload
(defun quickurl-list-mode ()
"A mode for browsing the quickurl URL list.
The key bindings for `quickurl-list-mode' are:
\\{quickurl-list-mode-map}"
(interactive)
(kill-all-local-variables)
(use-local-map quickurl-list-mode-map)
(setq major-mode 'quickurl-list-mode
mode-name "quickurl list")
(run-hooks 'quickurl-list-mode-hook)
(setq buffer-read-only t
truncate-lines t))
;;;###autoload
(defun quickurl-list ()
"Display `quickurl-list' as a formatted list using `quickurl-list-mode'."
(interactive)
(quickurl-load-urls)
(unless (string= (buffer-name) quickurl-list-buffer-name)
(setq quickurl-list-last-buffer (current-buffer)))
(pop-to-buffer quickurl-list-buffer-name)
(quickurl-list-populate-buffer)
(quickurl-list-mode))
(defun quickurl-list-populate-buffer ()
"Populate the `quickurl-list' buffer."
(with-current-buffer (get-buffer quickurl-list-buffer-name)
(let ((buffer-read-only nil)
(fmt (format "%%-%ds %%s\n"
(apply #'max (or (loop for url in quickurl-urls
collect (length (quickurl-url-description url)))
(list 20))))))
(setf (buffer-string) "")
(loop for url in quickurl-urls
do (let ((start (point)))
(insert (format fmt (quickurl-url-description url)
(quickurl-url-url url)))
(put-text-property start (1- (point))
'mouse-face 'highlight)))
(setf (point) (point-min)))))
(defun quickurl-list-add-url (word url comment)
"Wrapper for `quickurl-add-url' that doesn't guess the parameters."
(interactive "sWord: \nsURL: \nsComment: ")
(quickurl-add-url word url comment))
(defun quickurl-list-quit ()
"Kill the buffer named `quickurl-list-buffer-name'."
(interactive)
(kill-buffer quickurl-list-buffer-name)
(switch-to-buffer quickurl-list-last-buffer)
(delete-other-windows))
(defun quickurl-list-mouse-select (event)
"Select the URL under the mouse click."
(interactive "e")
(setf (point) (posn-point (event-end event)))
(quickurl-list-insert-url))
(defun quickurl-list-insert (type)
"Insert the URL under cursor into `quickurl-list-last-buffer'.
TYPE dictates what will be inserted, options are:
`url' - Insert the URL as <URL:url>
`naked-url' - Insert the URL with no formatting
`with-lookup' - Insert \"lookup <URL:url>\"
`with-desc' - Insert \"description <URL:url>\"
`lookup' - Insert the lookup for that URL"
(let ((url (nth (save-excursion
(beginning-of-line)
(count-lines (point-min) (point)))
quickurl-urls)))
(if url
(with-current-buffer quickurl-list-last-buffer
(insert
(case type
('url (format "<URL:%s>" (quickurl-url-url url)))
('naked-url (quickurl-url-url url))
('with-lookup (format "%s <URL:%s>"
(quickurl-url-keyword url)
(quickurl-url-url url)))
('with-desc (format "%S <URL:%s>"
(quickurl-url-description url)
(quickurl-url-url url)))
('lookup (quickurl-url-keyword url)))))
(error "No URL details on that line"))
url))
(defmacro quickurl-list-make-inserter (type)
"Macro to make a key-response function for use in `quickurl-list-mode-map'."
`(defun ,(intern (format "quickurl-list-insert-%S" type)) ()
,(format "Insert the result of calling `quickurl-list-insert' with `%s'." type)
(interactive)
(when (quickurl-list-insert ',type)
(quickurl-list-quit))))
(quickurl-list-make-inserter url)
(quickurl-list-make-inserter naked-url)
(quickurl-list-make-inserter with-lookup)
(quickurl-list-make-inserter with-desc)
(quickurl-list-make-inserter lookup)
(provide 'quickurl)
;;; quickurl.el ends here
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