-;;; elpher.el --- A friendly gopher and gemini client -*- lexical-binding:t -*-
-
-;; Copyright (C) 2019-2020 Tim Vaughan
+;;; elpher.el --- A friendly gopher and gemini client -*- lexical-binding: t -*-
+
+;; Copyright (C) 2021 Jens Östlund <jostlund@gmail.com>
+;; Copyright (C) 2021 F. Jason Park <jp@neverwas.me>
+;; Copyright (C) 2021 Christopher Brannon <chris@the-brannons.com>
+;; Copyright (C) 2021 Omar Polo <op@omarpolo.com>
+;; Copyright (C) 2021 Noodles! <nnoodle@chiru.no>
+;; Copyright (C) 2020-2021 Alex Schroeder <alex@gnu.org>
+;; Copyright (C) 2020 Zhiwei Chen <chenzhiwei03@kuaishou.com>
+;; Copyright (C) 2020 condy0919 <condy0919@gmail.com>
+;; Copyright (C) 2020 Alexis <flexibeast@gmail.com>
+;; Copyright (C) 2020 Étienne Deparis <etienne@depar.is>
+;; Copyright (C) 2020 Simon Nicolussi <sinic@sinic.name>
+;; Copyright (C) 2020 Michel Alexandre Salim <michel@michel-slm.name>
+;; Copyright (C) 2020 Koushk Roy <kroy@twilio.com>
+;; Copyright (C) 2020 Vee <vee@vnsf.xyz>
+;; Copyright (C) 2020 Simon South <simon@simonsouth.net>
+;; Copyright (C) 2019-2021 Tim Vaughan <plugd@thelambdalab.xyz>
;; Author: Tim Vaughan <plugd@thelambdalab.xyz>
;; Created: 11 April 2019
-;; Version: 2.10.2
+;; Version: 3.0.0
;; Keywords: comm gopher
-;; Homepage: http://thelambdalab.xyz/elpher
-;; Package-Requires: ((emacs "26.2"))
+;; Homepage: https://thelambdalab.xyz/elpher
+;; Package-Requires: ((emacs "27.1"))
;; This file is not part of GNU Emacs.
;; - caching of visited sites,
;; - pleasant and configurable colouring of Gopher directories,
;; - direct visualisation of image files,
-;; - a simple bookmark management system,
;; - gopher connections using TLS encryption,
;; - the fledgling Gemini protocol,
;; - the greybeard Finger protocol.
;; Elpher is under active development. Any suggestions for
;; improvements are welcome, and can be made on the official
-;; project page, gopher://thelambdalab.xyz/1/projects/elpher/.
+;; project page, gopher://thelambdalab.xyz/elpher, or via the
+;; project mailing list at https://lists.sr.ht/~michel-slm/elpher.
;;; Code:
(require 'url-util)
(require 'subr-x)
(require 'dns)
-(require 'ansi-color)
(require 'nsm)
(require 'gnutls)
(require 'socks)
+;;; ANSI colors or XTerm colors
+
+(or (require 'xterm-color nil t)
+ (require 'ansi-color))
+
+(defalias 'elpher-color-filter-apply
+ (if (fboundp 'xterm-color-filter)
+ (lambda (s)
+ (let ((_xterm-color-render nil))
+ (xterm-color-filter s)))
+ 'ansi-color-filter-apply)
+ "A function to filter out ANSI escape sequences.")
+
+(defalias 'elpher-color-apply
+ (if (fboundp 'xterm-color-filter)
+ 'xterm-color-filter
+ 'ansi-color-apply)
+ "A function to apply ANSI escape sequences.")
;;; Global constants
;;
-(defconst elpher-version "2.10.2"
+(defconst elpher-version "3.0.0"
"Current version of elpher.")
(defconst elpher-margin-width 6
(finger elpher-get-finger-page elpher-render-text "txt" elpher-text)
(telnet elpher-get-telnet-page nil "tel" elpher-telnet)
(other-url elpher-get-other-url-page nil "url" elpher-other-url)
- ((special bookmarks) elpher-get-bookmarks-page nil "/" elpher-index)
- ((special start) elpher-get-start-page nil))
+ ((special start) elpher-get-start-page nil "E" elpher-index)
+ ((special history) elpher-get-history-page nil "E" elpher-index)
+ ((special visited-pages) elpher-get-visited-pages-page nil "E" elpher-index))
"Association list from types to getters, renderers, margin codes and index faces.")
+;;; Internal variables
+;;
+
+;; buffer-local
+(defvar elpher--gemini-page-headings nil
+ "List of headings on the page.")
+
+
+;;; Declarations to avoid compiler warnings.
+;;
+
+(eval-when-compile
+ (defvar bookmark-make-record-function)
+ (declare-function bookmark-store "bookmark")
+ (declare-function org-link-store-props "ol")
+ (declare-function org-link-set-parameters "ol")
+ (defvar thing-at-point-uri-schemes)
+ (defvar mu4e~view-beginning-of-url-regexp))
+
+
;;; Customization group
;;
(defcustom elpher-open-urls-with-eww nil
"If non-nil, open URL selectors using eww.
-Otherwise, use the system browser via the BROWSE-URL function."
+Otherwise, use the system browser via the `browse-url' function."
:type '(boolean))
(defcustom elpher-use-header t
(defcustom elpher-auto-disengage-TLS nil
"If non-nil, automatically disengage TLS following an unsuccessful connection.
-While enabling this may seem convenient, it is also potentially dangerous as it
-allows switching from an encrypted channel back to plain text without user input."
+While enabling this may seem convenient, it is also potentially
+dangerous as it allows switching from an encrypted channel back to
+plain text without user input."
:type '(boolean))
(defcustom elpher-connection-timeout 5
:type '(file))
(defcustom elpher-default-url-type "gopher"
- "Default URL type to assume if not explicitly given."
+ "Default URL type (i.e. scheme) to assume if not explicitly given."
:type '(choice (const "gopher")
(const "gemini")))
"Specify the string used for bullets when rendering gemini maps."
:type '(string))
-(defcustom elpher-bookmarks-file (locate-user-emacs-file "elpher-bookmarks")
- "Specify the name of the file where elpher bookmarks will be saved."
- :type '(file))
-
(defcustom elpher-ipv4-always nil
"If non-nil, elpher will always use IPv4 to establish network connections.
This can be useful when browsing from a computer that supports IPv6, because
(let ((url (url-generic-parse-url url-string)))
(unless (and (not (url-fullness url)) (url-type url))
(setf (url-fullness url) t)
- (setf (url-filename url)
- (url-unhex-string (url-filename url)))
(unless (url-type url)
(setf (url-type url) elpher-default-url-type))
(unless (url-host url)
"Create an ADDRESS object corresponding to the given special address symbol TYPE."
type)
+(defun elpher-make-start-page ()
+ "Create the start page."
+ (elpher-make-page "Elpher Start Page"
+ (elpher-make-special-address 'start)))
+
(defun elpher-address-to-url (address)
"Get string representation of ADDRESS, or nil if ADDRESS is special."
(if (elpher-address-special-p address)
For gopher addresses this is a combination of the selector type and selector."
(if (symbolp address)
nil
- (url-filename address)))
+ (url-unhex-string (url-filename address))))
(defun elpher-address-host (address)
"Retrieve host from ADDRESS object."
(url-port address)))
(defun elpher-address-special-p (address)
- "Return non-nil if ADDRESS object is special (e.g. start page, bookmarks page)."
+ "Return non-nil if ADDRESS object is special (e.g. start page page)."
(symbolp address))
(defun elpher-address-gopher-p (address)
"Return non-nill if ADDRESS object is a gopher address."
(and (not (elpher-address-special-p address))
- (member (elpher-address-protocol address) '("gopher gophers"))))
+ (member (elpher-address-protocol address) '("gopher" "gophers"))))
(defun elpher-gopher-address-selector (address)
"Retrieve gopher selector from ADDRESS object."
"Set the address corresponding to PAGE to NEW-ADDRESS."
(setcar (cdr page) new-address))
-(defvar elpher-current-page nil) ; buffer local
-(defvar elpher-history nil) ; buffer local
+(defvar elpher-current-page nil
+ "The current page for this Elpher buffer.")
+
+(defvar elpher-history nil
+ "The local history stack for this Elpher buffer.
+This variable is used by `elpher-back' and
+`elpher-show-history'.")
+
+(defvar elpher-visited-pages nil
+ "The global history for all Elpher buffers.
+This variable is used by `elpher-show-visited-pages'.")
(defun elpher-visit-page (page &optional renderer no-history)
"Visit PAGE using its own renderer or RENDERER, if non-nil.
-Additionally, push PAGE onto the stack of previously-visited pages,
-unless NO-HISTORY is non-nil."
+Additionally, push PAGE onto the history stack and the list of
+previously-visited pages,unless NO-HISTORY is non-nil."
(elpher-save-pos)
(elpher-process-cleanup)
- (unless (or no-history
- (equal (elpher-page-address elpher-current-page)
- (elpher-page-address page)))
- (push elpher-current-page elpher-history))
+ (unless no-history
+ (unless (equal (elpher-page-address elpher-current-page)
+ (elpher-page-address page))
+ (push elpher-current-page elpher-history)
+ (unless (or (elpher-address-special-p (elpher-page-address page))
+ (and elpher-visited-pages
+ (equal page (car elpher-visited-pages))))
+ (push page elpher-visited-pages))))
(setq-local elpher-current-page page)
(let* ((address (elpher-page-address page))
(type (elpher-address-type address))
"Preprocess text selector response contained in STRING.
This involes decoding the character representation, and clearing
away CRs and any terminating period."
- (elpher-decode (replace-regexp-in-string "\n\.\n$" "\n"
+ (elpher-decode (replace-regexp-in-string "\n\\.\n$" "\n"
(replace-regexp-in-string "\r" "" string))))
If non-nil, FORCE-IPV4 causes the network connection to be made over
ipv4 only. (The default behaviour when this is not set depends on
-the host operating system and the local network capabilities."
+the host operating system and the local network capabilities.)"
(if (and use-tls (not (gnutls-available-p)))
(error "Use of TLS requires Emacs to be compiled with GNU TLS support")
(unless (< (elpher-address-port address) 65536)
(when (> new-hkbytes-received hkbytes-received)
(setq hkbytes-received new-hkbytes-received)
(elpher-buffer-message
- (concat "("
- (number-to-string (/ hkbytes-received 10.0))
- " MB read)")
- 1)))
+ (concat "("
+ (number-to-string (/ hkbytes-received 10.0))
+ " MB read)")
+ 1)))
(setq response-string-parts
(cons string response-string-parts))))
(set-process-sentinel proc
(mapcar
(lambda (file)
(file-name-sans-extension file))
- (directory-files elpher-certificate-directory nil "\.key$")))
+ (directory-files elpher-certificate-directory nil "\\.key$")))
(defun elpher-forget-current-certificate ()
"Causes any current certificate to be forgotten.)
(if type-map-entry
(let* ((margin-code (elt type-map-entry 2))
(face (elt type-map-entry 3))
- (filtered-display-string (ansi-color-filter-apply display-string))
+ (filtered-display-string (elpher-color-filter-apply display-string))
(page (elpher-make-page filtered-display-string address)))
(elpher-insert-margin margin-code)
(insert-text-button filtered-display-string
;; Text rendering
(defconst elpher-url-regex
- "\\([a-zA-Z]+\\)://\\([a-zA-Z0-9.\-]*[a-zA-Z0-9\-]\\|\[[a-zA-Z0-9:]+\]\\)\\(:[0-9]+\\)?\\(/\\([0-9a-zA-Z\-_~?/@|:.%#=&]*[0-9a-zA-Z\-_~?/@|#]\\)?\\)?"
+ "\\([a-zA-Z]+\\)://\\([a-zA-Z0-9.-]*[a-zA-Z0-9-]\\|\\[[a-zA-Z0-9:]+\\]\\)\\(:[0-9]+\\)?\\(/\\([0-9a-zA-Z_~?/@|:.%#=&-]*[0-9a-zA-Z_~?/@|#-]\\)?\\)?"
"Regexp used to locate and buttinofy URLs in text files loaded by elpher.")
(defun elpher-buttonify-urls (string)
(while (re-search-forward elpher-url-regex nil t)
(let ((page (elpher-make-page (substring-no-properties (match-string 0))
(elpher-address-from-url (match-string 0)))))
- (make-text-button (match-beginning 0)
- (match-end 0)
- 'elpher-page page
- 'action #'elpher-click-link
- 'follow-link t
- 'help-echo #'elpher--page-button-help
- 'face 'button)))
+ (make-text-button (match-beginning 0)
+ (match-end 0)
+ 'elpher-page page
+ 'action #'elpher-click-link
+ 'follow-link t
+ 'help-echo #'elpher--page-button-help
+ 'face 'button)))
(buffer-string)))
(defconst elpher-ansi-regex "\x1b\\[[^m]*m"
- "Wildly incomplete regexp used to strip out some troublesome ANSI escape sequences.")
+ "Incomplete regexp used to strip out some troublesome ANSI escape sequences.")
(defun elpher-process-text-for-display (string)
"Perform any desired processing of STRING prior to display as text.
Currently includes buttonifying URLs and processing ANSI escape codes."
(elpher-buttonify-urls (if elpher-filter-ansi-from-text
- (ansi-color-filter-apply string)
- (ansi-color-apply string))))
+ (elpher-color-filter-apply string)
+ (elpher-color-apply string))))
(defun elpher-render-text (data &optional _mime-type-string)
"Render DATA as text. MIME-TYPE-STRING is unused."
(defun elpher-get-gopher-query-page (renderer)
"Getter for gopher addresses requiring input.
The response is rendered using the rendering function RENDERER."
- (let* ((address (elpher-page-address elpher-current-page))
- (content (elpher-get-cached-content address))
- (aborted t))
+ (let* ((address (elpher-page-address elpher-current-page))
+ (content (elpher-get-cached-content address))
+ (aborted t))
(if (and content (funcall renderer nil))
(elpher-with-clean-buffer
(insert content)
(error "Gemini server response unknown: %s %s"
response-code response-meta))))))
+(defun elpher--read-answer-polyfill (question answers)
+ "Polyfill for `read-answer' in Emacs 26.1.
+QUESTION is a string containing a question, and ANSWERS
+is a list of possible answers."
+ (completing-read question (mapcar 'identity answers)))
+
+(if (fboundp 'read-answer)
+ (defalias 'elpher-read-answer 'read-answer)
+ (defalias 'elpher-read-answer 'elpher--read-answer-polyfill))
+
(defun elpher-choose-client-certificate ()
"Prompt for a client certificate to use to establish a TLS connection."
(let* ((read-answer-short t))
(condition-case the-error
(if (and content (funcall renderer nil))
(elpher-with-clean-buffer
- (insert content)
- (elpher-restore-pos))
+ (insert content)
+ (elpher-restore-pos))
(elpher-with-clean-buffer
(insert "LOADING GEMINI... (use 'u' to cancel)\n"))
(setq elpher-gemini-redirect-chain nil)
(insert elpher-gemini-link-string)
(if type-map-entry
(let* ((face (elt type-map-entry 3))
- (filtered-display-string (ansi-color-filter-apply display-string))
+ (filtered-display-string (elpher-color-filter-apply display-string))
(page (elpher-make-page filtered-display-string address)))
(insert-text-button filtered-display-string
'face face
(2 'elpher-gemini-heading2)
(3 'elpher-gemini-heading3)
(_ 'default)))
- (fill-column (if (display-graphic-p)
- (/ (* fill-column
- (font-get (font-spec :name (face-font 'default)) :size))
- (font-get (font-spec :name (face-font face)) :size)) fill-column)))
+ (fill-column (if (display-graphic-p)
+ (/ (* fill-column
+ (font-get (font-spec :name (face-font 'default)) :size))
+ (font-get (font-spec :name (face-font face)) :size)) fill-column)))
+ (setq elpher--gemini-page-headings (cons (cons header (point))
+ elpher--gemini-page-headings))
(unless (display-graphic-p)
(insert (make-string level ?#) " "))
(insert (propertize header 'face face))
(defun elpher-gemini-insert-text (text-line)
"Insert a plain non-preformatted TEXT-LINE into a text/gemini document.
This function uses Emacs' auto-fill to wrap text sensibly to a maximum
-width defined by elpher-gemini-max-fill-width."
- (string-match "\\(^[ \t]*\\)\\(\*[ \t]+\\|>[ \t]*\\)?" text-line)
+width defined by `elpher-gemini-max-fill-width'."
+ (string-match "\\(^[ \t]*\\)\\(\\*[ \t]+\\|>[ \t]*\\)?" text-line)
(let* ((line-prefix (match-string 2 text-line))
(processed-text-line
(if line-prefix
(cond ((string-prefix-p "*" line-prefix)
(concat
- (replace-regexp-in-string "\*"
+ (replace-regexp-in-string "\\*"
elpher-gemini-bullet-string
(match-string 0 text-line))
(substring text-line (match-end 0))))
(propertize text-line 'face 'elpher-gemini-quoted))
(t text-line))
text-line))
- (adaptive-fill-mode nil))
+ (adaptive-fill-mode t)
+ ;; fill-prefix is important for adaptive-fill-mode: without
+ ;; it, multi-line list items are not indented correct
+ (fill-prefix (if (match-string 2 text-line)
+ (replace-regexp-in-string "[>\*]" " " (match-string 0 text-line))
+ nil)))
(insert (elpher-process-text-for-display processed-text-line))
(newline)))
(defun elpher-render-gemini-map (data _parameters)
"Render DATA as a gemini map file, PARAMETERS is currently unused."
(elpher-with-clean-buffer
+ (setq elpher--gemini-page-headings nil)
(let ((preformatted nil))
(auto-fill-mode 1)
(setq-local fill-column (min (window-width) elpher-gemini-max-fill-width))
(preformatted (insert (elpher-process-text-for-display
(propertize line 'face 'elpher-gemini-preformatted))
"\n"))
- ((string-prefix-p "=>" line) (elpher-gemini-insert-link line))
+ ((string-prefix-p "=>" line)
+ (elpher-gemini-insert-link line))
((string-prefix-p "#" line) (elpher-gemini-insert-header line))
(t (elpher-gemini-insert-text line)))))
+ (setq elpher--gemini-page-headings (nreverse elpher--gemini-page-headings))
(elpher-cache-content
(elpher-page-address elpher-current-page)
(buffer-string))))
(browse-url url)))))
-;; Start page page retrieval
+;; Start page retrieval
(defun elpher-get-start-page (renderer)
"Getter which displays the start page (RENDERER must be nil)."
" - RET/mouse-1: open item under cursor\n"
" - m: select an item on current page by name (autocompletes)\n"
" - u/mouse-3/U: return to previous page or to the start page\n"
- " - o/O: visit different selector or the root menu of the current server\n"
" - g: go to a particular address (gopher, gemini, finger)\n"
+ " - o/O: open a different address selector or the root menu of the current server\n"
" - d/D: download item under cursor or current page\n"
" - i/I: info on item under cursor or current page\n"
" - c/C: copy URL representation of item under cursor or current page\n"
" - a/A: bookmark the item under cursor or current page\n"
- " - x/X: remove bookmark for item under cursor or current page\n"
- " - B: visit the bookmarks page\n"
+ " - B: list all bookmarks\n"
+ " - s/S: show current history stack or all previously visted pages\n"
" - r: redraw current page (using cached contents if available)\n"
" - R: reload current page (regenerates cache)\n"
- " - S: set character coding system for gopher (default is to autodetect)\n"
+ " - !: set character coding system for gopher (default is to autodetect)\n"
" - T: toggle TLS gopher mode\n"
" - F: forget/discard current TLS client certificate\n"
" - .: display the raw server response for the current page\n"
"Alternatively, select a search engine and enter some search terms:\n")
(elpher-insert-index-record "Gopher Search Engine (Veronica-2)"
(elpher-make-gopher-address ?7 "/v2/vs" "gopher.floodgap.com" 70))
- (elpher-insert-index-record "Gemini Search Engine (GUS)"
- (elpher-address-from-url "gemini://gus.guru/search"))
+ (elpher-insert-index-record "Gemini Search Engine (geminispace.info)"
+ (elpher-address-from-url "gemini://geminispace.info/search"))
(insert "\n"
- "This page contains your bookmarked sites (also visit with B):\n")
- (elpher-insert-index-record "Your Bookmarks" 'bookmarks)
+ "Your bookmarks are stored in your ")
+ (let ((help-string "RET,mouse-1: Open Emacs bookmark list"))
+ (insert-text-button "Emacs bookmark list"
+ 'face 'link
+ 'action (lambda (_)
+ (interactive)
+ (call-interactively #'bookmark-bmenu-list))
+ 'follow-link t
+ 'help-echo help-string))
+ (insert ".\n")
+ (insert (propertize
+ "(Bookmarks from legacy elpher-bookmarks files will be automatically imported.)\n"
+ 'face 'shadow))
(insert "\n"
"For Elpher release news or to leave feedback, visit:\n")
(elpher-insert-index-record "The Elpher Project Page"
'face 'shadow))
(elpher-restore-pos)))
-;; Bookmarks page page retrieval
+;; History page retrieval
+
+(defun elpher-show-history ()
+ "Show the current contents of elpher's history stack.
+Use \\[elpher-show-visited-pages] to see the entire history.
+This is rendered using `elpher-get-history-page' via `elpher-type-map'."
+ (interactive)
+ (elpher-visit-page
+ (elpher-make-page "Current History Stack"
+ (elpher-make-special-address 'history))))
+
+(defun elpher-show-visited-pages ()
+ "Show the all the pages you've visited using Elpher.
+Use \\[elpher-show-history] to see just the current history stack.
+This is rendered using `elpher-get-visited-pages-page' via `elpher-type-map'."
+ (interactive)
+ (elpher-visit-page
+ (elpher-make-page "Elpher Visted Pages"
+ (elpher-make-special-address 'visited-pages))))
-(defun elpher-get-bookmarks-page (renderer)
- "Getter to load and display the current bookmark list (RENDERER must be nil)."
+(defun elpher-get-history-page (renderer)
+ "Getter which displays the history page (RENDERER must be nil)."
(when renderer
(elpher-visit-previous-page)
- (error "Command not supported for bookmarks page"))
- (elpher-with-clean-buffer
- (insert "---- Bookmark list ----\n\n")
- (let ((bookmarks (elpher-load-bookmarks)))
- (if bookmarks
- (dolist (bookmark bookmarks)
- (let ((display-string (elpher-bookmark-display-string bookmark))
- (address (elpher-address-from-url (elpher-bookmark-url bookmark))))
- (elpher-insert-index-record display-string address)))
- (insert "No bookmarks found.\n")))
- (insert "\n-----------------------\n"
- "\n"
- "- u: return to previous page\n"
- "- x: delete selected bookmark\n"
- "- a: rename selected bookmark\n"
- "\n"
- "Bookmarks are stored in the file ")
- (let ((filename elpher-bookmarks-file)
- (help-string "RET,mouse-1: Open bookmarks file in new buffer for editing."))
- (insert-text-button filename
- 'face 'link
- 'action (lambda (_)
- (interactive)
- (find-file filename))
- 'follow-link t
- 'help-echo help-string))
- (insert "\n")
- (elpher-restore-pos)))
+ (error "Command not supported for history page"))
+ (elpher-display-history-links elpher-history "Current history stack"))
+
+(defun elpher-get-visited-pages-page (renderer)
+ "Getter which displays the list of visited pages (RENDERER must be nil)."
+ (when renderer
+ (elpher-visit-previous-page)
+ (error "Command not supported for history page"))
+ (elpher-display-history-links
+ (seq-filter (lambda (page)
+ (not (elpher-address-special-p (elpher-page-address page))))
+ elpher-visited-pages)
+ "All visited pages"))
+
+(defun elpher-display-history-links (pages title)
+ "Show all PAGES in an Elpher buffer with a given TITLE."
+ (let* ((title-line (concat "---- " title " ----"))
+ (footer-line (make-string (length title-line) ?-)))
+ (elpher-with-clean-buffer
+ (insert title-line "\n\n")
+ (if pages
+ (dolist (page pages)
+ (when page
+ (let ((display-string (elpher-page-display-string page))
+ (address (elpher-page-address page)))
+ (elpher-insert-index-record display-string address))))
+ (insert "No history items found.\n"))
+ (insert "\n" footer-line "\n"
+ "Select and entry or press 'u' to return to the previous page.")
+ (elpher-restore-pos))))
;;; Bookmarks
+
+;; This code allows Elpher to use the standard Emacs bookmarks: `C-x r
+;; m' to add a bookmark, `C-x r l' to list bookmarks (which is where
+;; you can anotate bookmarks!), `C-x r b' to jump to a bookmark, and
+;; so on. See the Bookmarks section in the Emacs info manual for more.
+
+(defvar elpher-bookmark-link nil
+ "Prefer bookmarking a link or the current page.
+Bind this variable dynamically, or set it to t.
+If you set it to t, the commands \\[bookmark-set-no-overwrite]
+and \\[elpher-set-bookmark-no-overwrite] do the same thing.")
+
+(defun elpher-bookmark-make-record ()
+ "Return a bookmark record.
+If `elpher-bookmark-link' is non-nil and point is on a link button,
+return a bookmark record for that link. Otherwise, return a bookmark
+record for the current elpher page."
+ (let* ((button (and elpher-bookmark-link (button-at (point))))
+ (page (if button
+ (button-get button 'elpher-page)
+ elpher-current-page))
+ (address (elpher-page-address page))
+ (url (elpher-address-to-url address))
+ (display-string (elpher-page-display-string page))
+ (pos (if button nil (point))))
+ (if (elpher-address-special-p address)
+ (error "Cannot bookmark %s" display-string)
+ `(,display-string
+ (defaults . (,display-string))
+ (position . ,pos)
+ (location . ,url)
+ (handler . elpher-bookmark-jump)))))
+
+;;;###autoload
+(defun elpher-bookmark-jump (bookmark)
+ "Go to a particular BOOKMARK."
+ (let* ((url (cdr (assq 'location bookmark))))
+ (elpher-go url)))
+
+(defun elpher-set-bookmark-no-overwrite ()
+ "Bookmark the link at point.
+To bookmark the current page, use \\[bookmark-set-no-overwrite]."
+ (interactive)
+ (let ((elpher-bookmark-link t))
+ (bookmark-set-no-overwrite)))
+
+(defun elpher-bookmark-import (file)
+ "Import Elpher bookmarks file FILE into Emacs bookmarks."
+ (interactive (list (if (and (boundp 'elpher-bookmarks-file)
+ (file-readable-p elpher-bookmarks-file))
+ elpher-bookmarks-file
+ (read-file-name "Old Elpher bookmarks: "
+ user-emacs-directory nil t
+ "elpher-bookmarks"))))
+ (require 'bookmark)
+ (dolist (bookmark (with-temp-buffer
+ (insert-file-contents file)
+ (read (current-buffer))))
+ (let* ((display-string (car bookmark))
+ (url (cadr bookmark))
+ (record `(,display-string
+ (location . ,url)
+ (handler . elpher-bookmark-jump))))
+ (bookmark-store display-string (cdr record) t)))
+ (bookmark-save))
+
+;;; Integrations
;;
-(defun elpher-make-bookmark (display-string url)
- "Make an elpher bookmark.
-DISPLAY-STRING determines how the bookmark will appear in the
-bookmark list, while URL is the url of the entry."
- (list display-string url))
-
-(defun elpher-bookmark-display-string (bookmark)
- "Get the display string of BOOKMARK."
- (elt bookmark 0))
-
-(defun elpher-set-bookmark-display-string (bookmark display-string)
- "Set the display string of BOOKMARK to DISPLAY-STRING."
- (setcar bookmark display-string))
-
-(defun elpher-bookmark-url (bookmark)
- "Get the address for BOOKMARK."
- (elt bookmark 1))
-
-(defun elpher-save-bookmarks (bookmarks)
- "Record the bookmark list BOOKMARKS to the user's bookmark file.
-Beware that this completely replaces the existing contents of the file."
- (let ((bookmark-dir (file-name-directory elpher-bookmarks-file)))
- (unless (file-directory-p bookmark-dir)
- (make-directory bookmark-dir)))
- (with-temp-file elpher-bookmarks-file
- (erase-buffer)
- (insert "; Elpher bookmarks file\n\n"
- "; Bookmarks are stored as a list of (label URL) items.\n"
- "; Feel free to edit by hand, but take care to ensure\n"
- "; the list structure remains intact.\n\n")
- (pp bookmarks (current-buffer))))
-
-(defun elpher-load-bookmarks ()
- "Get the list of bookmarks from the users's bookmark file."
- (let ((bookmarks
- (with-temp-buffer
- (ignore-errors
- (insert-file-contents elpher-bookmarks-file)
- (goto-char (point-min))
- (read (current-buffer))))))
- (if (and bookmarks (listp (cadar bookmarks)))
- (progn
- (message "Reading old bookmark file. (Will be updated on write.)")
- (mapcar (lambda (old-bm)
- (list (car old-bm)
- (elpher-address-to-url (apply #'elpher-make-gopher-address
- (cadr old-bm)))))
- bookmarks))
- bookmarks)))
-
-(defun elpher-add-address-bookmark (address display-string)
- "Save a bookmark for ADDRESS with label DISPLAY-STRING.)))
-If ADDRESS is already bookmarked, update the label only."
- (let ((bookmarks (elpher-load-bookmarks))
- (url (elpher-address-to-url address)))
- (let ((existing-bookmark (rassoc (list url) bookmarks)))
- (if existing-bookmark
- (elpher-set-bookmark-display-string existing-bookmark display-string)
- (push (elpher-make-bookmark display-string url) bookmarks)))
- (elpher-save-bookmarks bookmarks)))
-
-(defun elpher-remove-address-bookmark (address)
- "Remove any bookmark to ADDRESS."
- (let ((url (elpher-address-to-url address)))
- (elpher-save-bookmarks
- (seq-filter (lambda (bookmark)
- (not (equal (elpher-bookmark-url bookmark) url)))
- (elpher-load-bookmarks)))))
+;;; Org
+
+(defun elpher-org-export-link (link description format protocol)
+ "Export a LINK with DESCRIPTION for the given PROTOCOL and FORMAT.
+
+FORMAT is an Org export backend. DESCRIPTION may be nil. PROTOCOL may be one
+of gemini, gopher or finger."
+ (let* ((url (if (equal protocol "elpher")
+ (string-remove-prefix "elpher:" link)
+ (format "%s:%s" protocol link)))
+ (desc (or description url)))
+ (pcase format
+ (`gemini (format "=> %s %s" url desc))
+ (`html (format "<a href=\"%s\">%s</a>" url desc))
+ (`latex (format "\\href{%s}{%s}" url desc))
+ (_ (if (not description)
+ url
+ (format "%s (%s)" desc url))))))
+
+(defun elpher-org-store-link ()
+ "Store link to an `elpher' page in Org."
+ (when (eq major-mode 'elpher-mode)
+ (let* ((url (elpher-info-current))
+ (desc (car elpher-current-page))
+ (protocol (cond
+ ((string-prefix-p "gemini:" url) "gemini")
+ ((string-prefix-p "gopher:" url) "gopher")
+ ((string-prefix-p "finger:" url) "finger")
+ (t "elpher"))))
+ (when (equal "elpher" protocol)
+ ;; Weird link. Or special inner link?
+ (setq url (concat "elpher:" url)))
+ (org-link-store-props :type protocol :link url :description desc)
+ t)))
+
+(defun elpher-org-follow-link (link protocol)
+ "Visit a LINK for the given PROTOCOL.
+
+PROTOCOL may be one of gemini, gopher or finger. This method also
+supports the old protocol elpher, where the link is self-contained."
+ (let ((url (if (equal protocol "elpher")
+ (string-remove-prefix "elpher:" link)
+ (format "%s:%s" protocol link))))
+ (elpher-go url)))
+
+(defun elpher-org-mode-integration ()
+ "Set up `elpher' integration for `org-mode'."
+ (org-link-set-parameters
+ "elpher"
+ :store #'elpher-org-store-link
+ :export (lambda (link description format _plist)
+ (elpher-org-export-link link description format "elpher"))
+ :follow (lambda (link _arg) (elpher-org-follow-link link "elpher")))
+ (org-link-set-parameters
+ "gemini"
+ :export (lambda (link description format _plist)
+ (elpher-org-export-link link description format "gemini"))
+ :follow (lambda (link _arg) (elpher-org-follow-link link "gemini")))
+ (org-link-set-parameters
+ "gopher"
+ :export (lambda (link description format _plist)
+ (elpher-org-export-link link description format "gopher"))
+ :follow (lambda (link _arg) (elpher-org-follow-link link "gopher")))
+ (org-link-set-parameters
+ "finger"
+ :export (lambda (link description format _plist)
+ (elpher-org-export-link link description format "finger"))
+ :follow (lambda (link _arg) (elpher-org-follow-link link "finger"))))
+
+(add-hook 'org-mode-hook #'elpher-org-mode-integration)
+
+;;; Browse URL
+
+;;;###autoload
+(defun elpher-browse-url-elpher (url &rest _args)
+ "Browse URL using Elpher. This function is used by `browse-url'."
+ (interactive (browse-url-interactive-arg "Elpher URL: "))
+ (elpher-go url))
+
+;; Use elpher to open gopher, finger and gemini links
+;; For recent version of `browse-url' package
+(if (boundp 'browse-url-default-handlers)
+ (add-to-list
+ 'browse-url-default-handlers
+ '("^\\(gopher\\|finger\\|gemini\\)://" . elpher-browse-url-elpher))
+ ;; Patch `browse-url-browser-function' for older ones. The value of
+ ;; that variable is `browse-url-default-browser' by default, so
+ ;; that's the function that gets advised.
+ (advice-add browse-url-browser-function :before-while
+ (lambda (url &rest _args)
+ "Handle gemini, gopher, and finger schemes using Elpher."
+ (let ((scheme (downcase (car (split-string url ":" t)))))
+ (if (member scheme '("gemini" "gopher" "finger"))
+ ;; `elpher-go' always returns nil, which will stop the
+ ;; advice chain here in a before-while
+ (elpher-go url)
+ ;; chain must continue, then return t.
+ t)))))
+
+;; Register "gemini://" as a URI scheme so `browse-url' does the right thing
+(with-eval-after-load 'thingatpt
+ (add-to-list 'thing-at-point-uri-schemes "gemini://"))
+
+;;; Mu4e:
+
+;; Make mu4e aware of the gemini world
+(setq mu4e~view-beginning-of-url-regexp
+ "\\(?:https?\\|gopher\\|finger\\|gemini\\)://\\|mailto:")
;;; Interactive procedures
;;
(address (elpher-address-from-url cleaned-host-or-url))
(page (elpher-make-page cleaned-host-or-url address)))
(switch-to-buffer elpher-buffer-name)
- (elpher-visit-page page)
+ (elpher-with-clean-buffer
+ (elpher-visit-page page))
nil))
(defun elpher-go-current ()
"Go to a particular site read from the minibuffer, initialized with the current URL."
(interactive)
(let ((address (elpher-page-address elpher-current-page)))
- (if (elpher-address-special-p address)
- (error "Command invalid for this page")
- (let ((url (read-string "Gopher or Gemini URL: " (elpher-address-to-url address))))
- (elpher-visit-page (elpher-make-page url (elpher-address-from-url url)))))))
+ (let ((url (read-string "Gopher or Gemini URL: "
+ (unless (elpher-address-special-p address)
+ (elpher-address-to-url address)))))
+ (elpher-visit-page (elpher-make-page url (elpher-address-from-url url))))))
(defun elpher-redraw ()
"Redraw current page."
(interactive)
(setq-local elpher-current-page nil)
(setq-local elpher-history nil)
- (let ((start-page (elpher-make-page "Elpher Start Page"
- (elpher-make-special-address 'start))))
- (elpher-visit-page start-page)))
+ (elpher-visit-page (elpher-make-start-page)))
(defun elpher-download ()
"Download the link at point."
(elpher-go (elpher-address-to-url address-copy))))
(error "Command invalid for %s" (elpher-page-display-string elpher-current-page)))))
-(defun elpher-bookmarks-current-p ()
- "Return non-nil if current page is a bookmarks page."
- (equal (elpher-address-type (elpher-page-address elpher-current-page))
- '(special bookmarks)))
-
-(defun elpher-reload-bookmarks ()
- "Reload bookmarks if current page is a bookmarks page."
- (if (elpher-bookmarks-current-p)
- (elpher-reload-current-page)))
-
-(defun elpher-bookmark-current ()
- "Bookmark the current page."
- (interactive)
- (let ((address (elpher-page-address elpher-current-page))
- (display-string (elpher-page-display-string elpher-current-page)))
- (if (not (elpher-address-special-p address))
- (let ((bookmark-display-string (read-string "Bookmark display string: "
- display-string)))
- (elpher-add-address-bookmark address bookmark-display-string)
- (message "Bookmark added."))
- (error "Cannot bookmark %s" display-string))))
-
-(defun elpher-bookmark-link ()
- "Bookmark the link at point."
- (interactive)
- (let ((button (button-at (point))))
- (if button
- (let* ((page (button-get button 'elpher-page))
- (address (elpher-page-address page))
- (display-string (elpher-page-display-string page)))
- (if (not (elpher-address-special-p address))
- (let ((bookmark-display-string (read-string "Bookmark display string: "
- display-string)))
- (elpher-add-address-bookmark address bookmark-display-string)
- (elpher-reload-bookmarks)
- (message "Bookmark added."))
- (error "Cannot bookmark %s" display-string)))
- (error "No link selected"))))
-
-(defun elpher-unbookmark-current ()
- "Remove bookmark for the current page."
- (interactive)
- (let ((address (elpher-page-address elpher-current-page)))
- (when (and (not (elpher-address-special-p address))
- (y-or-n-p "Really remove bookmark for the current page? "))
- (elpher-remove-address-bookmark address)
- (message "Bookmark removed."))))
-
-(defun elpher-unbookmark-link ()
- "Remove bookmark for the link at point."
- (interactive)
- (let ((button (button-at (point))))
- (if button
- (when (y-or-n-p "Really remove bookmark for this link? ")
- (let ((page (button-get button 'elpher-page)))
- (elpher-remove-address-bookmark (elpher-page-address page))
- (elpher-reload-bookmarks)
- (message "Bookmark removed.")))
- (error "No link selected"))))
-
-;;;###autoload
-(defun elpher-bookmarks ()
- "Visit bookmarks page."
- (interactive)
- (switch-to-buffer elpher-buffer-name)
- (elpher-visit-page
- (elpher-make-page "Bookmarks Page" (elpher-make-special-address 'bookmarks))))
-
(defun elpher-info-page (page)
"Display information on PAGE."
(let ((display-string (elpher-page-display-string page))
(define-key map (kbd "<backtab>") 'elpher-prev-link)
(define-key map (kbd "C-M-i") 'elpher-prev-link)
(define-key map (kbd "u") 'elpher-back)
- (define-key map (kbd "U") 'elpher-back-to-start)
+ (define-key map (kbd "-") 'elpher-back)
+ (define-key map (kbd "^") 'elpher-back)
(define-key map [mouse-3] 'elpher-back)
- (define-key map (kbd "O") 'elpher-root-dir)
+ (define-key map (kbd "U") 'elpher-back-to-start)
(define-key map (kbd "g") 'elpher-go)
(define-key map (kbd "o") 'elpher-go-current)
+ (define-key map (kbd "O") 'elpher-root-dir)
+ (define-key map (kbd "s") 'elpher-show-history)
+ (define-key map (kbd "S") 'elpher-show-visited-pages)
(define-key map (kbd "r") 'elpher-redraw)
(define-key map (kbd "R") 'elpher-reload)
(define-key map (kbd "T") 'elpher-toggle-tls)
(define-key map (kbd "I") 'elpher-info-current)
(define-key map (kbd "c") 'elpher-copy-link-url)
(define-key map (kbd "C") 'elpher-copy-current-url)
- (define-key map (kbd "a") 'elpher-bookmark-link)
- (define-key map (kbd "A") 'elpher-bookmark-current)
- (define-key map (kbd "x") 'elpher-unbookmark-link)
- (define-key map (kbd "X") 'elpher-unbookmark-current)
- (define-key map (kbd "B") 'elpher-bookmarks)
- (define-key map (kbd "S") 'elpher-set-gopher-coding-system)
+ (define-key map (kbd "a") 'elpher-set-bookmark-no-overwrite)
+ (define-key map (kbd "A") 'bookmark-set-no-overwrite)
+ (define-key map (kbd "B") 'bookmark-bmenu-list)
+ (define-key map (kbd "!") 'elpher-set-gopher-coding-system)
(define-key map (kbd "F") 'elpher-forget-current-certificate)
(when (fboundp 'evil-define-key*)
- (evil-define-key* 'motion map
- (kbd "TAB") 'elpher-next-link
- (kbd "C-") 'elpher-follow-current-link
- (kbd "C-t") 'elpher-back
- (kbd "u") 'elpher-back
- (kbd "U") 'elpher-back-to-start
- [mouse-3] 'elpher-back
- (kbd "g") 'elpher-go
- (kbd "o") 'elpher-go-current
- (kbd "r") 'elpher-redraw
- (kbd "R") 'elpher-reload
- (kbd "T") 'elpher-toggle-tls
- (kbd ".") 'elpher-view-raw
- (kbd "d") 'elpher-download
- (kbd "D") 'elpher-download-current
- (kbd "m") 'elpher-jump
- (kbd "i") 'elpher-info-link
- (kbd "I") 'elpher-info-current
- (kbd "c") 'elpher-copy-link-url
- (kbd "C") 'elpher-copy-current-url
- (kbd "a") 'elpher-bookmark-link
- (kbd "A") 'elpher-bookmark-current
- (kbd "x") 'elpher-unbookmark-link
- (kbd "X") 'elpher-unbookmark-current
- (kbd "B") 'elpher-bookmarks
- (kbd "S") 'elpher-set-gopher-coding-system
- (kbd "F") 'elpher-forget-current-certificate))
+ (evil-define-key*
+ 'motion map
+ (kbd "TAB") 'elpher-next-link
+ (kbd "C-") 'elpher-follow-current-link
+ (kbd "C-t") 'elpher-back
+ (kbd "u") 'elpher-back
+ (kbd "-") 'elpher-back
+ (kbd "^") 'elpher-back
+ [mouse-3] 'elpher-back
+ (kbd "U") 'elpher-back-to-start
+ (kbd "g") 'elpher-go
+ (kbd "o") 'elpher-go-current
+ (kbd "O") 'elpher-root-dir
+ (kbd "s") 'elpher-show-history
+ (kbd "S") 'elpher-show-visited-pages
+ (kbd "r") 'elpher-redraw
+ (kbd "R") 'elpher-reload
+ (kbd "T") 'elpher-toggle-tls
+ (kbd ".") 'elpher-view-raw
+ (kbd "d") 'elpher-download
+ (kbd "D") 'elpher-download-current
+ (kbd "m") 'elpher-jump
+ (kbd "i") 'elpher-info-link
+ (kbd "I") 'elpher-info-current
+ (kbd "c") 'elpher-copy-link-url
+ (kbd "C") 'elpher-copy-current-url
+ (kbd "a") 'elpher-set-bookmark-no-overwrite
+ (kbd "A") 'bookmark-set-no-overwrite
+ (kbd "B") 'bookmark-bmenu-list
+ (kbd "!") 'elpher-set-gopher-coding-system
+ (kbd "F") 'elpher-forget-current-certificate))
map)
"Keymap for gopher client.")
"Major mode for elpher, an elisp gopher client.
This mode is automatically enabled by the interactive
-functions which initialize the gopher client, namely
-`elpher', `elpher-go' and `elpher-bookmarks'."
+functions which initialize the client, namely
+`elpher', and `elpher-go'."
+ (setq-local elpher--gemini-page-headings nil)
(setq-local elpher-current-page nil)
(setq-local elpher-history nil)
- (setq-local elpher-buffer-name (buffer-name)))
+ (setq-local elpher-buffer-name (buffer-name))
+ (setq-local bookmark-make-record-function #'elpher-bookmark-make-record)
+ (setq-local imenu-create-index-function (lambda () elpher--gemini-page-headings)))
(when (fboundp 'evil-set-initial-state)
(evil-set-initial-state 'elpher-mode 'motion))
The buffer used for Elpher sessions is determined by the value of
‘elpher-buffer-name’. If there is already an Elpher session active in
that buffer, Emacs will simply switch to it. Otherwise, a new session
-will begin. A numeric prefix arg (as in ‘C-u 42 M-x elpher RET’)
-switches to the session with that number, creating it if necessary. A
-nonnumeric prefix arg means to create a new session. Returns the
-buffer selected (or created)."
+will begin. A numeric prefix ARG (as in ‘\\[universal-argument] 42
+\\[execute-extended-command] elpher RET’) switches to the session with
+that number, creating it if necessary. A non numeric prefix ARG means
+to create a new session. Returns the buffer selected (or created)."
(interactive "P")
(let* ((name (default-value 'elpher-buffer-name))
- (buf (cond ((numberp arg)
- (get-buffer-create (format "%s<%d>" name arg)))
- (arg
- (generate-new-buffer name))
- (t
- (get-buffer-create name)))))
+ (buf (cond ((numberp arg)
+ (get-buffer-create (format "%s<%d>" name arg)))
+ (arg
+ (generate-new-buffer name))
+ (t
+ (get-buffer-create name)))))
(pop-to-buffer-same-window buf)
(unless (buffer-modified-p)
(elpher-mode)
- (let ((start-page (elpher-make-page "Elpher Start Page"
- (elpher-make-special-address 'start))))
- (elpher-visit-page start-page))
+ (elpher-visit-page (elpher-make-start-page))
"Started Elpher."))); Otherwise (elpher) evaluates to start page string.
;;; elpher.el ends here
The Lambda Lab / projects / elpher.git / blobdiff