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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 (see also handyurl.el which is available
+;; from <URL:http://www.hagbard.demon.co.uk/archives/handyurl.el>), 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
+;; the `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.
+;;
+;; o Merge quickurl.el and handyurl.el to provide a fuller URL management
+;;   facility that would allow for the pulling, inserting and browsing of
+;;   URLs.
+
+;;; 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))))
+
+;; `caddr' is a function in cl and so might not always be available
+;; (remembering the general rule that says cl functions should not be used,
+;; only cl macros). So, to make use of `caddr' without forcing the load of
+;; cl-seq we'll define out own.
+
+(eval-when (load eval)
+  (unless (fboundp 'caddr)
+    (defun caddr (l)
+      "Return the `car' of the `cddr' of L."
+      (car (cddr l)))))
+
+;; Create a version constant.
+
+;; 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)
+      (caddr url)
+    ""))
+
+(defsetf quickurl-url-comment (url) (store)
+  `
+  (if (quickurl-url-commented-p ,url)
+      (if (zerop (length ,store))
+          (setf (cdr ,url) (cadr ,url))
+        (setf (caddr ,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
+             ;; `thing-at-point' returns 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-focused-line ()
+  "Work out the line containing point."
+  (save-excursion
+    (beginning-of-line)
+    (let ((point (point)))
+      (setf (point) (point-min))
+      (loop while (< (point) point) sum 1 do (next-line 1)))))
+
+(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 (quickurl-list-focused-line) 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