;; Author: Tim Vaughan <tgvaughan@gmail.com>
;; Created: 11 April 2019
-;; Version: 1.4.7
+;; Version: 2.0.0
;; Keywords: comm gopher
;; Homepage: https://github.com/tgvaughan/elpher
;; Package-Requires: ((emacs "26"))
(defun elpher-address-gopher-p (address)
"Return non-nill if ADDRESS object is a gopher address."
- (memq (elpher-address-protocol address) '("gopher gophers")))
+ (and (not (elpher-address-special-p address))
+ (member (elpher-address-protocol address) '("gopher gophers"))))
(defun elpher-gopher-address-selector (address)
"Retrieve gopher selector from ADDRESS object."
(let ((address (elpher-node-address node)))
(format "mouse-1, RET: open '%s'" (elpher-address-to-url address))))
-(defun elpher-insert-index-record (display-string address)
+(defun elpher-insert-index-record (display-string &optional address)
"Function to insert an index record into the current buffer.
-The contents of the record are dictated by DISPLAY-STRING and ADDRESS."
- (let* ((type (elpher-address-type address))
+The contents of the record are dictated by DISPLAY-STRING and ADDRESS.
+If ADDRESS is not supplied or nil the record is rendered as an
+'information' line."
+ (let* ((type (if address (elpher-address-type address) nil))
(type-map-entry (cdr (assoc type elpher-type-map))))
(if type-map-entry
(let* ((margin-code (elt type-map-entry 1))
'follow-link t
'help-echo (elpher-node-button-help node)))
(pcase type
- ('(gopher ?i) ;; Information
+ ((or '(gopher ?i) 'nil) ;; Information
(elpher-insert-margin)
(insert (propertize
(if elpher-buttonify-urls-in-directories
(elpher-visit-node node)))
+;;; Network error reporting
+;;
+
+(defun elpher-network-error (address error)
+ (elpher-with-clean-buffer
+ (insert (propertize "\n---- ERROR -----\n\n" 'face 'error)
+ "When attempting to retrieve " (elpher-address-to-url address) ":\n"
+ (error-message-string the-error) ".\n"
+ (propertize "\n----------------\n\n" 'face 'error)
+ "Press 'u' to return to the previous page.")))
+
+
;;; Gopher selector retrieval (all kinds)
;;
;; Gemini node retrieval
(defvar elpher-gemini-response)
+(defvar elpher-gemini-response-header)
+(defvar elpher-gemini-in-header)
-(defun elpher-get-gemini (address after &optional propagate-error)
+(defun elpher-gemini-response-code ()
+ (elt (split-string elpher-gemini-response-header) 0))
+
+(defun elpher-gemini-response-meta ()
+ (string-trim (substring elpher-gemini-response-header
+ (string-match "[ \t]+" elpher-gemini-response-header))))
+
+(defun elpher-get-gemini (address after)
"Retrieve gemini ADDRESS, then execute AFTER.
-The result is stored as a string in the variable ‘elpher-selector-string’.
+The response header is stored in the variable ‘elpher-gemini-response-header’.
+If available, the response is stored in the variable ‘elpher-gemini-response’.
Usually errors result in an error page being displayed. This is only
appropriate if the selector is to be directly viewed. If PROPAGATE-ERROR
is non-nil, this message is not displayed. Instead, the error propagates
up to the calling function."
(setq elpher-gemini-response "")
+ (setq elpher-gemini-response-header "")
+ (setq elpher-gemini-in-header t)
(if (not (gnutls-available-p))
- (error "Cannot retrieve TLS selector: GnuTLS not available"))
- (condition-case the-error
- (let* ((kill-buffer-query-functions nil)
- (proc (open-network-stream "elpher-process"
- nil
- (elpher-address-host address)
- (elpher-address-port address)
- :type 'tls)))
- (set-process-coding-system proc 'binary)
- (set-process-filter proc
- (lambda (proc string)
+ (error "Cannot retrieve TLS selector: GnuTLS not available")
+ (let* ((kill-buffer-query-functions nil)
+ (proc (open-network-stream "elpher-process"
+ nil
+ (elpher-address-host address)
+ (elpher-address-port address)
+ :type 'tls)))
+ (set-process-coding-system proc 'binary)
+ (set-process-filter proc
+ (lambda (proc string)
+ (if elpher-gemini-in-header
+ (progn
+ (setq elpher-gemini-response-header
+ (concat elpher-gemini-response-header
+ (elt (split-string string "\r\n") 0)))
+ (let ((idx (string-match "\r\n" string)))
+ (setq elpher-gemini-response
+ (substring string (+ idx 2)))
+ (setq elpher-gemini-in-header nil)))
(setq elpher-gemini-response
- (concat elpher-gemini-response string))))
- (set-process-sentinel proc after)
- (process-send-string proc
- (concat (elpher-address-to-url address) "\r\n")))
+ (concat elpher-gemini-response string)))))
+ (set-process-sentinel proc after)
+ (process-send-string proc
+ (concat (elpher-address-to-url address) "\r\n")))))
+
+(defun elpher-render-gemini-response (mime-type-raw)
+ (let* ((mime-type-full (if (string-empty-p mime-type-raw)
+ "text/gemini; charset=utf-8"
+ mime-type-raw))
+ (mime-type-split (split-string mime-type-full ";"))
+ (mime-type (string-trim (elt mime-type-split 0)))
+ (parameters (if (> (length mime-type-split) 1)
+ (string-trim (elt mime-type-split 1))
+ "")))
+ ;; (message "MIME type %S with parameters %S" mime-type parameters)
+ (pcase mime-type
+ ((or "text/gemini" "")
+ (elpher-render--mimetype-text/gemini elpher-gemini-response parameters))
+ ((pred (string-prefix-p "text/"))
+ (elpher-render--mimetype-text/plain elpher-gemini-response parameters))
+ ((pred (string-prefix-p "image/"))
+ (elpher-render--mimetype-image/* elpher-gemini-response parameters))
+ (other
+ (error "Unsupported MIME type %S" mime-type)))))
+
+(defun elpher-gemini-get-link-url (line)
+ (string-trim (elt (split-string (substring line 2)) 0)))
+
+(defun elpher-gemini-get-link-display-string (line)
+ (let* ((rest (string-trim (elt (split-string line "=>") 1)))
+ (idx (string-match "[ \t]" rest)))
+ (if idx
+ (string-trim (substring rest (+ idx 1)))
+ "")))
+
+(defun elpher-address-from-gemini-url (url)
+ (let ((address (url-generic-parse-url url)))
+ (unless (equal (url-type address) "mailto")
+ (setf (url-fullness address) t)
+ (unless (url-host address)
+ (setf (url-host address) (url-host (elpher-node-address elpher-current-node)))
+ (unless (string-prefix-p "/" (url-filename address))
+ (setf (url-filename address)
+ (concat (file-name-as-directory
+ (url-filename (elpher-node-address elpher-current-node)))
+ (url-filename address)))))
+ (unless (url-type address)
+ (setf (url-type address) "gemini"))
+ (unless (> (url-port address) 0)
+ (pcase (url-type address)
+ ("gemini" (setf (url-port address) 1965))
+ ("gopher" (setf (url-port address) 70)))))
+ address))
+
+(defun elpher-render--mimetype-text/gemini (data parameters)
+ (elpher-with-clean-buffer
+ (dolist (line (split-string (elpher-preprocess-text-response data) "\n"))
+ (if (string-prefix-p "=>" line)
+ (let* ((url (elpher-gemini-get-link-url line))
+ (display-string (elpher-gemini-get-link-display-string line))
+ (address (elpher-address-from-gemini-url url)))
+ (if (> (length display-string) 0)
+ (elpher-insert-index-record display-string address)
+ (elpher-insert-index-record url address)))
+ (elpher-insert-index-record line)))
+ (elpher-restore-pos)
+ (elpher-cache-content
+ (elpher-node-address elpher-current-node)
+ (buffer-string))))
+
+(defun elpher-render--mimetype-text/plain (data parameters)
+ (elpher-with-clean-buffer
+ (insert (elpher-buttonify-urls (elpher-preprocess-text-response data)))
+ (elpher-restore-pos)
+ (elpher-cache-content
+ (elpher-node-address elpher-current-node)
+ (buffer-string))))
+
+(defun elpher-render--mimetype-image/* (data parameters)
+ (let ((image (create-image data nil t)))
+ (elpher-with-clean-buffer
+ (insert-image image)
+ (elpher-restore-pos))))
+
+(defun elpher-process-gemini-response (proc event)
+ (condition-case the-error
+ (unless (string-prefix-p "deleted" event)
+ (let ((response-code (elpher-gemini-response-code))
+ (meta (elpher-gemini-response-meta)))
+ (pcase (elt response-code 0)
+ (?1 ; Input required
+ (elpher-with-clean-buffer
+ (insert "Gemini server is requesting input."))
+ (let* ((query-string (read-string (concat meta ": ")))
+ (url (elpher-address-to-url (elpher-node-address elpher-current-node)))
+ (query-address (elpher-address-from-url (concat url "?" query-string))))
+ (elpher-get-gemini query-address #'elpher-process-gemini-response)))
+ (?2 ; Normal response
+ (message elpher-gemini-response-header)
+ (elpher-render-gemini-response meta))
+ (?3 ; Redirect
+ (message "Following redirect to %s" meta)
+ (let ((redirect-address (elpher-address-from-gemini-url meta)))
+ (elpher-get-gemini redirect-address #'elpher-process-gemini-response)))
+ (?4 ; Temporary failure
+ (error "Gemini server reports TEMPORARY FAILURE for this request"))
+ (?5 ; Permanent failure
+ (error "Gemini server reports PERMANENT FAILURE for this request"))
+ (?6 ; Client certificate required
+ (error "Gemini server requires client certificate (unsupported at this time)"))
+ (other
+ (error "Gemini server responded with unknown response code %S"
+ response-code)))))
(error
- (elpher-process-cleanup)
- (if propagate-error
- (error the-error)
- (elpher-with-clean-buffer
- (insert (propertize "\n---- ERROR -----\n\n" 'face 'error)
- "Failed to connect to " (elpher-address-to-url address) ".\n"
- (propertize "\n----------------\n\n" 'face 'error)
- "Press 'u' to return to the previous page."))))))
+ (elpher-network-error (elpher-node-address elpher-current-node) the-error))))
+
(defun elpher-get-gemini-node ()
"Getter which retrieves and renders a Gemini node."
(let* ((address (elpher-node-address elpher-current-node))
(content (elpher-get-cached-content address)))
- (if content
- (progn
+ (condition-case the-error
+ (if content
+ (progn
+ (elpher-with-clean-buffer
+ (insert content)
+ (elpher-restore-pos)))
(elpher-with-clean-buffer
- (insert content)
- (elpher-restore-pos)))
- (elpher-with-clean-buffer
- (insert "LOADING GEMINI... (use 'u' to cancel)"))
- (elpher-get-gemini address
- (lambda (proc event)
- (unless (string-prefix-p "deleted" event)
- (elpher-with-clean-buffer
- (insert (elpher-buttonify-urls
- (elpher-preprocess-text-response
- elpher-gemini-response)))
- (elpher-restore-pos)
- (elpher-cache-content
- (elpher-node-address elpher-current-node)
- (buffer-string)))))))))
+ (insert "LOADING GEMINI... (use 'u' to cancel)"))
+ (elpher-get-gemini address #'elpher-process-gemini-response))
+ (error
+ (elpher-network-error address the-error)))))
+
+
;; Other URL node opening
(push-button))
(defun elpher-go ()
- "Go to a particular gopher site read from the minibuffer.
-The site may be specified via a URL or explicitly in terms of
-host, selector and port."
+ "Go to a particular gopher site read from the minibuffer."
(interactive)
(let ((node
- (let ((host-or-url (read-string "Gopher host or URL: ")))
+ (let ((host-or-url (read-string "Gopher or Gemini URL: ")))
(elpher-make-node host-or-url
(elpher-address-from-url host-or-url)))))
(switch-to-buffer "*elpher*")
(let ((address (elpher-node-address elpher-current-node)))
(if (elpher-address-special-p address)
(error "Command not valid for this page")
- (let ((url (read-string "URL: " (elpher-address-to-url address))))
+ (let ((url (read-string "Gopher or Gemini URL: " (elpher-address-to-url address))))
(elpher-visit-node (elpher-make-node url (elpher-address-from-url url)))))))
(defun elpher-redraw ()
(defun elpher-root-dir ()
"Visit root of current server."
(interactive)
- (let* ((address (elpher-node-address elpher-current-node))
- (host (elpher-address-host address)))
- (if host
- (let ((host (elpher-address-host address))
- (selector (elpher-gopher-address-selector address))
- (port (elpher-address-port address)))
- (if (> (length selector) 0)
- (let ((root-address (elpher-make-gopher-address ?1 "" host port)))
- (elpher-visit-node
- (elpher-make-node (elpher-address-to-url root-address))))
- (error "Already at root directory of current server")))
+ (let ((address (elpher-node-address elpher-current-node)))
+ (if (not (elpher-address-special-p address))
+ (if (or (member (url-filename address) '("/" ""))
+ (and (elpher-address-gopher-p address)
+ (= (length (elpher-gopher-address-selector address)) 0)))
+ (error "Already at root directory of current server")
+ (let ((address-copy (elpher-address-from-url
+ (elpher-address-to-url address))))
+ (setf (url-filename address-copy) "")
+ (elpher-visit-node
+ (elpher-make-node (elpher-address-to-url address-copy)
+ address-copy))))
(error "Command invalid for this page"))))
(defun elpher-bookmarks-current-p ()
(kbd "C-") 'elpher-follow-current-link
(kbd "C-t") 'elpher-back
(kbd "u") 'elpher-back
- (kbd "O") 'elpher-root-dir
(kbd "g") 'elpher-go
(kbd "o") 'elpher-go-current
(kbd "r") 'elpher-redraw
"Keymap for gopher client.")
(define-derived-mode elpher-mode special-mode "elpher"
- "Major mode for elpher, an elisp 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
The Lambda Lab / projects / elpher.git / blobdiff