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+;;; webjump.el --- programmable Web hotlist
+     
+;; Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+
+;; Author:    Neil W. Van Dyke <nwv@acm.org>
+;; Created:   09-Aug-1996
+;; Keywords:  comm www
+
+;; 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:
+
+;; WebJump provides a sort of ``programmable hotlist'' of Web sites that can
+;; quickly be invoked in your Web browser.  Each Web site in the hotlist has a
+;; name, and you select the desired site name via a completing string prompt in
+;; the minibuffer.  The URL for each Web site is defined as a static string or
+;; a built-in or custom function, allowing interactive prompting for
+;; site-specific queries and options.
+
+;; Note that WebJump was originally intended to complement your conventional
+;; browser-based hotlist, not replace it.  (Though there's no reason you
+;; couldn't use WebJump for your entire hotlist if you were so inclined.)
+
+;; The `webjump-sites' variable, which defines the hotlist, defaults to some
+;; example sites.  You'll probably want to override it with your own favorite
+;; sites.  The documentation for the variable describes the syntax.
+
+;; You may wish to add something like the following to your `.emacs' file:
+;;
+;;   (require 'webjump)
+;;   (global-set-key "\C-cj" 'webjump)
+;;   (setq webjump-sites
+;;         (append '(
+;;                   ("My Home Page" . "www.someisp.net/users/joebobjr/")
+;;                   ("Pop's Site"   . "www.joebob-and-son.com/")
+;;                   )
+;;                 webjump-sample-sites))
+;;
+;; The above loads this package, binds `C-c j' to invoke WebJump, and adds your
+;; personal favorite sites to the hotlist.
+
+;; The `webjump-sample-sites' variable mostly contains some site entries that
+;; are expected to be generally relevant to many users, but excluding
+;; those that the GNU project would not want to recommend.
+
+;; The `browse-url' package is used to submit URLs to the browser, so any
+;; browser-specific configuration should be done there.
+
+;;; Code:
+
+;;-------------------------------------------------------- Package Dependencies
+
+(require 'browse-url)
+
+;;------------------------------------------------------------------- Constants
+
+(defvar webjump-sample-sites
+  '(
+
+    ;; FSF, not including Emacs-specific.
+    ("GNU Project FTP Archive" .
+     [mirrors "ftp://ftp.gnu.org/pub/gnu/"
+              ;; ASIA:
+              "ftp://ftp.cs.titech.ac.jp"
+              "ftp://tron.um.u-tokyo.ac.jp/pub/GNU/prep"
+              "ftp://cair-archive.kaist.ac.kr/pub/gnu"
+              "ftp://ftp.nectec.or.th/pub/mirrors/gnu"
+              ;; AUSTRALIA:
+              "ftp://archie.au/gnu"
+              "ftp://archie.oz/gnu"
+              "ftp://archie.oz.au/gnu"
+              ;; AFRICA:
+              "ftp://ftp.sun.ac.za/pub/gnu"
+              ;; MIDDLE-EAST:
+              "ftp://ftp.technion.ac.il/pub/unsupported/gnu"
+              ;; EUROPE:
+              "ftp://irisa.irisa.fr/pub/gnu"
+              "ftp://ftp.univ-lyon1.fr/pub/gnu"
+              "ftp://ftp.mcc.ac.uk"
+              "ftp://unix.hensa.ac.uk/mirrors/uunet/systems/gnu"
+              "ftp://src.doc.ic.ac.uk/gnu"
+              "ftp://ftp.ieunet.ie/pub/gnu"
+              "ftp://ftp.eunet.ch"
+              "ftp://nic.switch.ch/mirror/gnu"
+              "ftp://ftp.informatik.rwth-aachen.de/pub/gnu"
+              "ftp://ftp.informatik.tu-muenchen.de"
+              "ftp://ftp.win.tue.nl/pub/gnu"
+              "ftp://ftp.nl.net"
+              "ftp://ftp.etsimo.uniovi.es/pub/gnu"
+              "ftp://ftp.funet.fi/pub/gnu"
+              "ftp://ftp.denet.dk"
+              "ftp://ftp.stacken.kth.se"
+              "ftp://isy.liu.se"
+              "ftp://ftp.luth.se/pub/unix/gnu"
+              "ftp://ftp.sunet.se/pub/gnu"
+              "ftp://archive.eu.net"
+              ;; SOUTH AMERICA: 
+              "ftp://ftp.inf.utfsm.cl/pub/gnu"
+              "ftp://ftp.unicamp.br/pub/gnu"
+              ;; WESTERN CANADA:
+              "ftp://ftp.cs.ubc.ca/mirror2/gnu"
+              ;; USA:
+              "ftp://wuarchive.wustl.edu/systems/gnu"
+              "ftp://labrea.stanford.edu"
+              "ftp://ftp.digex.net/pub/gnu"
+              "ftp://ftp.kpc.com/pub/mirror/gnu"
+              "ftp://f.ms.uky.edu/pub3/gnu"
+              "ftp://jaguar.utah.edu/gnustuff"
+              "ftp://ftp.hawaii.edu/mirrors/gnu"
+              "ftp://uiarchive.cso.uiuc.edu/pub/gnu"
+              "ftp://ftp.cs.columbia.edu/archives/gnu/prep"
+              "ftp://gatekeeper.dec.com/pub/GNU"
+              "ftp://ftp.uu.net/systems/gnu"])
+    ("GNU Project Home Page" . "www.gnu.org")
+
+    ;; Emacs.
+    ("Emacs Lisp Archive" .
+     "ftp://ftp.emacs.org/pub/")
+
+    ;; Internet search engines.
+    ("AltaVista" . 
+     [simple-query
+      "www.altavista.digital.com"
+      "www.altavista.digital.com/cgi-bin/query?pg=aq&what=web&fmt=.&q="
+      "&r=&d0=&d1="])
+    ("Archie" .
+     [simple-query "hoohoo.ncsa.uiuc.edu/cgi-bin/AA.pl"
+		   "hoohoo.ncsa.uiuc.edu/cgi-bin/AA.pl?query=" ""])
+    ("Lycos" .
+     [simple-query "www.lycos.com"
+                   "www.lycos.com/cgi-bin/pursuit?cat=lycos&query=" ""])
+    ("Yahoo" . 
+     [simple-query "www.yahoo.com" "search.yahoo.com/bin/search?p=" ""])
+
+    ;; Misc. general interest.
+    ("Interactive Weather Information Network" . webjump-to-iwin)
+    ("Usenet FAQs" . 
+     [simple-query "www.cis.ohio-state.edu/hypertext/faq/usenet/FAQ-List.html"
+		   "www.cis.ohio-state.edu/htbin/search-usenet-faqs/form?find="
+		   ""])
+    ("RTFM Usenet FAQs by Group" .
+     "ftp://rtfm.mit.edu/pub/usenet-by-group/")
+    ("RTFM Usenet FAQs by Hierachy" .
+     "ftp://rtfm.mit.edu/pub/usenet-by-hierarchy/")
+    ("X Consortium Archive" . "ftp.x.org")
+    ("Yahoo: Reference" . "www.yahoo.com/Reference/")
+
+    ;; Computer social issues, privacy, professionalism.
+    ("Association for Computing Machinery" . "www.acm.org")
+    ("Computer Professionals for Social Responsibility" . "www.cpsr.org/dox/")
+    ("Electronic Frontier Foundation" . "www.eff.org")
+    ("IEEE Computer Society" . "www.computer.org")
+    ("Risks Digest" . webjump-to-risks)
+
+    ;; Fun.
+    ("Bastard Operator from Hell" . "www.replay.com/bofh/")
+
+    )
+  "Sample hotlist for WebJump.  See the documentation for the `webjump'
+function and the `webjump-sites' variable.")
+
+(defvar webjump-state-to-postal-alist
+  '(("Alabama" . "al") ("Alaska" . "ak") ("Arizona" . "az") ("Arkansas" . "ar")
+    ("California" . "ca") ("Colorado" . "co") ("Connecticut" . "ct")
+    ("Delaware" . "de") ("Florida" . "fl") ("Georgia" . "ga") ("Hawaii" . "hi")
+    ("Idaho" . "id") ("Illinois" . "il") ("Indiana" . "in") ("Iowa" . "ia")
+    ("Kansas" . "ks") ("Kentucky" . "ky") ("Louisiana" . "la") ("Maine" . "me")
+    ("Maryland" . "md") ("Massachusetts" . "ma") ("Michigan" . "mi")
+    ("Minnesota" . "mn") ("Mississippi" . "ms") ("Missouri" . "mo")
+    ("Montana" . "mt") ("Nebraska" . "ne") ("Nevada" . "nv")
+    ("New Hampshire" . "nh") ("New Jersey" . "nj") ("New Mexico" . "nm")
+    ("New York" . "ny") ("North Carolina" . "nc") ("North Dakota" . "nd")
+    ("Ohio" . "oh") ("Oklahoma" . "ok") ("Oregon" . "or")
+    ("Pennsylvania" . "pa") ("Rhode Island" . "ri") ("South Carolina" . "sc")
+    ("South Dakota" . "sd") ("Tennessee" . "tn") ("Texas" . "tx")
+    ("Utah" . "ut") ("Vermont" . "vt") ("Virginia" . "va")
+    ("Washington" . "wa") ("West Virginia" . "wv") ("Wisconsin" . "wi")
+    ("Wyoming" . "wy")))
+
+;;------------------------------------------------------------ Option Variables
+
+(defvar webjump-sites
+  webjump-sample-sites
+  "*Hotlist for WebJump.
+
+The hotlist is represented as an association list, with the CAR of each cell
+being the name of the Web site, and the CDR being the definition for the URL of
+that site.  The URL definition can be a string (the URL), a vector (specifying
+a special \"builtin\" which returns a URL), a symbol (name of a function which
+returns a URL), or a list (which when `eval'ed yields a URL).
+
+If the URL definition is a vector, then a \"builtin\" is used.  A builtin has a
+Lisp-like syntax, with the name as the first element of the vector, and any
+arguments as the following elements.  The three current builtins are `name',
+which returns the name of the site as the URL, `simple-query', which
+returns a URL that is a function of a query entered by the user, and `mirrors',
+which allows the user to select from among multiple mirror sites for the same
+content.
+
+The first argument to the `simple-query' builtin is a static URL to use if the
+user enters a blank query.  The second and third arguments are the prefix and
+suffix, respectively, to add to the encoded query the user enters.  This
+builtin covers Web sites that have single-string searches with the query
+embedded in the URL.
+
+The arguments to the `mirrors' builtin are URLs of mirror sites.
+
+If the symbol of a function is given, then the function will be called with the
+Web site name (the one you specified in the CAR of the alist cell) as a
+parameter.  This might come in handy for various kludges.
+
+For convenience, if the `http://', `ftp://', or `file://' prefix is missing
+from a URL, WebJump will make a guess at what you wanted and prepend it before
+submitting the URL.")
+
+;;------------------------------------------------------- Sample Site Functions
+
+(defun webjump-to-iwin (name)
+  (let ((prefix "http://iwin.nws.noaa.gov/")
+        (state (webjump-read-choice name "state"
+                                    (append '(("Puerto Rico" . "pr"))
+                                            webjump-state-to-postal-alist))))
+    (if state
+        (concat prefix "iwin/" state "/"
+                (webjump-read-choice name "option"
+                                     '(("Hourly Report" . "hourly")
+                                       ("State Forecast" . "state")
+                                       ("Local Forecast" . "local")
+                                       ("Zone Forecast" . "zone")
+                                       ("Short-Term Forecast" . "shortterm")
+                                       ("Weather Summary" . "summary")
+                                       ("Public Information" . "public")
+                                       ("Climatic Data" . "climate")
+                                       ("Aviation Products" . "aviation")
+                                       ("Hydro Products" . "hydro")
+                                       ("Special Weather" . "special")
+                                       ("Watches and Warnings" . "warnings"))
+                                     "zone")
+                ".html")
+      prefix)))
+
+(defun webjump-to-risks (name)
+  (let (issue volume)
+    (if (and (setq volume (webjump-read-number (concat name " volume")))
+	     (setq issue  (webjump-read-number (concat name " issue"))))
+	(format "catless.ncl.ac.uk/Risks/%d.%02d.html" volume issue)
+      "catless.ncl.ac.uk/Risks/")))
+
+;;-------------------------------------------------------------- Core Functions
+
+;;;###autoload
+(defun webjump ()
+  "Jumps to a Web site from a programmable hotlist.
+
+See the documentation for the `webjump-sites' variable for how to customize the
+hotlist.
+
+Please submit bug reports and other feedback to the author, Neil W. Van Dyke
+<nwv@acm.org>."
+  (interactive)
+  (let* ((completion-ignore-case t)
+	 (item (assoc-ignore-case
+		(completing-read "WebJump to site: " webjump-sites nil t)
+		webjump-sites))
+	 (name (car item))
+	 (expr (cdr item)))
+    (browse-url (webjump-url-fix
+		 (cond ((not expr) "")
+		       ((stringp expr) expr)
+		       ((vectorp expr) (webjump-builtin expr name))
+		       ((listp expr) (eval expr))
+		       ((symbolp expr)
+			(if (fboundp expr)
+			    (funcall expr name)
+			  (error "WebJump URL function \"%s\" undefined." 
+				 expr)))
+		       (t (error "WebJump URL expression for \"%s\" invalid."
+				 name)))))))
+
+(defun webjump-builtin (expr name)
+  (if (< (length expr) 1)
+      (error "WebJump URL builtin for \"%s\" empty." name))
+  (let ((builtin (aref expr 0)))
+    (cond
+     ((eq builtin 'mirrors)
+      (if (= (length expr) 1)
+          (error
+           "WebJump URL builtin \"mirrors\" for \"%s\" needs at least 1 arg."))
+      (webjump-choose-mirror name (cdr (append expr nil))))
+     ((eq builtin 'name)
+      name)
+     ((eq builtin 'simple-query)
+      (webjump-builtin-check-args expr name 3)
+      (webjump-do-simple-query name (aref expr 1) (aref expr 2) (aref expr 3)))
+     (t (error "WebJump URL builtin \"%s\" for \"%s\" invalid."
+	       builtin name)))))
+
+(defun webjump-builtin-check-args (expr name count)
+  (or (= (length expr) (1+ count))
+      (error "WebJump URL builtin \"%s\" for \"%s\" needs %d args."
+	     (aref expr 0) name count)))
+
+(defun webjump-choose-mirror (name urls)
+  (webjump-read-url-choice (concat name " mirror")
+                           urls
+                           (webjump-mirror-default urls)))
+
+(defun webjump-do-simple-query (name noquery-url query-prefix query-suffix)
+  (let ((query (webjump-read-string (concat name " query"))))
+    (if query
+	(concat query-prefix (webjump-url-encode query) query-suffix)
+      noquery-url)))
+
+(defun webjump-mirror-default (urls)
+  ;; Note: This should be modified to apply some simple kludges/heuristics to
+  ;; pick a site which is likely "close".  As a tie-breaker among candidates
+  ;; judged equally desirable, randomness might be used.
+  (car urls))
+
+(defun webjump-read-choice (name what choices &optional default)
+  (let* ((completion-ignore-case t)
+         (choice (completing-read (concat name " " what ": ") choices nil t)))
+    (if (webjump-null-or-blank-string-p choice)
+        default
+      (cdr (assoc choice choices)))))
+
+(defun webjump-read-number (prompt)
+  ;; Note: I should make this more robust someday.
+  (let ((input (webjump-read-string prompt)))
+    (if input (string-to-number input))))
+  
+(defun webjump-read-string (prompt)
+  (let ((input (read-string (concat prompt ": "))))
+    (if (webjump-null-or-blank-string-p input) nil input)))
+  
+(defun webjump-read-url-choice (what urls &optional default)
+  ;; Note: Convert this to use `webjump-read-choice' someday.
+  (let* ((completions (mapcar (function (lambda (n) (cons n n)))
+                              urls))
+	 (input (completing-read (concat what
+                                         ;;(if default " (RET for default)" "")
+                                         ": ")
+                                 completions
+                                 nil
+                                 t)))
+    (if (webjump-null-or-blank-string-p input)
+        default
+      (car (assoc input completions)))))
+
+(defun webjump-null-or-blank-string-p (str)
+  (or (null str) (string-match "^[ \t]*$" str)))
+
+(defun webjump-url-encode (str)
+  (mapconcat '(lambda (c)
+		(cond ((= c 32) "+")
+		      ((or (and (>= c ?a) (<= c ?z))
+			   (and (>= c ?A) (<= c ?Z))
+			   (and (>= c ?0) (<= c ?9)))
+		       (char-to-string c))
+		      (t (upcase (format "%%%02x" c)))))
+	     str
+	     ""))
+
+(defun webjump-url-fix (url)
+  (if (webjump-null-or-blank-string-p url)
+      ""
+    (webjump-url-fix-trailing-slash
+     (cond
+      ((string-match "^[a-zA-Z]+:" url) url)
+      ((string-match "^/" url) (concat "file://" url))
+      ((string-match "^\\([^\\./]+\\)" url)
+       (concat (if (string= (downcase (match-string 1 url)) "ftp")
+		   "ftp"
+		 "http")
+	       "://"
+	       url))
+      (t url)))))
+
+(defun webjump-url-fix-trailing-slash (url)
+  (if (string-match "^[a-zA-Z]+://[^/]+$" url)
+      (concat url "/")
+    url))
+
+;;-----------------------------------------------------------------------------
+
+(provide 'webjump)
+
+;; webjump.el ends here