hellmund/markdown-preview-mode
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Support multiple preview from same http port

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This commit is contained in:
Igor Shymko 2016-12-11 18:44:45 +02:00
parent 73af604f1d
commit 73d90fab7c
3 changed files with 113 additions and 48 deletions
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2
README.md
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@ -1,7 +1,6 @@
Markdown preview mode
===========================
[![MELPA Stable](http://stable.melpa.org/packages/markdown-preview-mode-badge.svg)](http://stable.melpa.org/#/markdown-preview-mode)
[![MELPA](http://melpa.org/packages/markdown-preview-mode-badge.svg)](http://melpa.org/#/markdown-preview-mode)
@ -69,7 +68,6 @@ Adjustable by `M-x customize-option` -> `markdown-preview-port`.
* `M-x el-get-self-update`
* `M-x el-get-install` -> `markdown-preview-mode`
## Dependencies
* [markdown-mode.el](https://github.com/defunkt/markdown-mode)

158
markdown-preview-mode.el
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@ -6,7 +6,7 @@
;; URL: https://github.com/ancane/markdown-preview-mode
;; Keywords: markdown, gfm, convenience
;; Version: 0.8
;; Package-Requires: ( (emacs "24.3") (websocket "1.6") (markdown-mode "2.0") (cl-lib "0.5") (web-server "0.1.1"))
;; Package-Requires: ((emacs "24.3") (websocket "1.6") (markdown-mode "2.0") (cl-lib "0.5") (web-server "0.1.1") (uuidgen "0.3"))
;; This file is not part of GNU Emacs.
@ -34,6 +34,7 @@
(require 'websocket)
(require 'markdown-mode)
(require 'web-server)
(require 'uuidgen)
(defgroup markdown-preview nil
"Markdown preview mode."
@ -83,11 +84,14 @@
(defvar markdown-preview--websocket-server nil
"`markdown-preview' Websocket server.")
(defvar markdown-preview--http-server nil
"`markdown-preview' http server.")
(defvar markdown-preview--local-client nil
"`markdown-preview' local client.")
(defvar markdown-preview--remote-clients nil
"List of `markdown-preview' websocket remote clients.")
(defvar markdown-preview--remote-clients (make-hash-table :test 'equal)
"Remote clients hashtable. UUID -> WS")
(defvar markdown-preview--home-dir (file-name-directory load-file-name)
"`markdown-preview-mode' home directory.")
@ -95,6 +99,12 @@
(defvar markdown-preview--idle-timer nil
"Preview idle timer.")
(defvar markdown-preview--uuid nil
"Unique preview identifier.")
(defvar markdown-preview--preview-buffers (make-hash-table :test 'equal)
"Preview buffers hashtable. UUID -> buffer-name.")
(defun markdown-preview--stop-idle-timer ()
"Stop the `markdown-preview' idle timer."
(when (timerp markdown-preview--idle-timer)
@ -103,8 +113,8 @@
(defun markdown-preview--css-links ()
"Get list of styles for preview in backward compatible way."
(let* ((custom-style (list markdown-preview-style))
(all-styles
(mapc (lambda (x) (add-to-list 'custom-style x t)) markdown-preview-stylesheets)))
(all-styles
(mapc (lambda (x) (add-to-list 'custom-style x t)) markdown-preview-stylesheets)))
(mapconcat
(lambda (x)
(concat "<link rel=\"stylesheet\" type=\"text/css\" href=\"" x "\">"))
@ -122,8 +132,9 @@
markdown-preview-javascript
"\n"))
(defun markdown-preview--read-preview-template (preview-file)
"Read preview template and writes rendered copy to PREVIEW-FILE, ready to be open in browser."
(defun markdown-preview--read-preview-template (preview-uuid preview-file)
"Read preview template and writes identified by PREVIEW-UUID
rendered copy to PREVIEW-FILE, ready to be open in browser."
(with-temp-file preview-file
(insert-file-contents (expand-file-name "preview.html" markdown-preview--home-dir))
(if (search-forward "${MD_STYLE}" nil t)
@ -134,49 +145,84 @@
(replace-match markdown-preview-ws-host t))
(if (search-forward "${WS_PORT}" nil t)
(replace-match (format "%s" markdown-preview-ws-port) t))
(if (search-forward "${MD_UUID}" nil t)
(replace-match (format "%s" preview-uuid) t))
(buffer-string)))
(defun markdown-preview--start-http-server (port)
"Start http server at PORT to serve preview file via http."
(lexical-let ((docroot default-directory))
(ws-start
(lambda (request)
(with-slots (process headers) request
(let* ((path (substring (cdr (assoc :GET headers)) 1))
(filename (expand-file-name path docroot)))
;;(message (format "===> Path: [%s]" path))
(if (string= path "")
(ws-send-file process (expand-file-name markdown-preview-file-name docroot))
(if (string= path "favicon.ico")
(ws-send-file process (expand-file-name path markdown-preview--home-dir))
(if (and (not (file-directory-p filename)) (file-exists-p filename))
(ws-send-file process filename)
(ws-send-404 process)
))))))
markdown-preview-http-port)))
(unless markdown-preview--http-server
(lexical-let ((docroot default-directory))
(setq markdown-preview--http-server
(ws-start
(lambda (request)
(with-slots (process headers) request
(let* ((path (substring (cdr (assoc :GET headers)) 1))
(filename (expand-file-name path docroot)))
(if (string= path "")
(progn
(ws-send-file
process
(expand-file-name
markdown-preview-file-name
(with-current-buffer
(gethash (markdown-preview--parse-uuid headers)
markdown-preview--preview-buffers)
default-directory
))))
(if (string= path "favicon.ico")
(ws-send-file process (expand-file-name path markdown-preview--home-dir))
(if (and (not (file-directory-p filename)) (file-exists-p filename))
(ws-send-file process filename)
(ws-send-404 process)
))))))
markdown-preview-http-port)))))
(defun markdown-preview--parse-uuid (headers)
"Find uuid query param in HEADERS."
(let ((found (cl-find-if (lambda (x)
(when (stringp (car x))
(equal "uuid" (format "%s" (car x)))))
headers)))
(when found (cdr found))))
(defun markdown-preview--open-browser-preview ()
"Open the markdown preview in the browser."
"Open the markdown preview in the browser."
(when (eq markdown-preview-auto-open 'file)
(browse-url (expand-file-name markdown-preview-file-name default-directory)))
(when (eq markdown-preview-auto-open 'http)
(browse-url (format "http://localhost:%d" markdown-preview-http-port)))
(browse-url
(format "http://localhost:%d/?uuid=%s" markdown-preview-http-port markdown-preview--uuid)))
(unless markdown-preview-auto-open
(message (format "Preview address: http://0.0.0.0:%d" markdown-preview-http-port))))
(message
(format
"Preview address: http://0.0.0.0:%d/?uuid=%s"
markdown-preview-http-port
markdown-preview--uuid))))
(defun markdown-preview--stop-websocket-server ()
"Stop the `markdown-preview' websocket server."
(clrhash markdown-preview--preview-buffers)
(when markdown-preview--local-client
(websocket-close markdown-preview--local-client))
(when markdown-preview--websocket-server
(delete-process markdown-preview--websocket-server)
(setq markdown-preview--websocket-server nil
markdown-preview--remote-clients nil)))
(setq markdown-preview--websocket-server nil)
(clrhash markdown-preview--remote-clients)))
(defun markdown-preview--stop-http-server ()
"Stop the `markdown-preview' http server."
(when markdown-preview--http-server
(ws-stop markdown-preview--http-server)
(setq markdown-preview--http-server nil)))
(defun markdown-preview--drop-closed-clients ()
"Clean closed clients in `markdown-preview--remote-clients' list."
(setq markdown-preview--remote-clients
(cl-remove-if-not #'websocket-openp markdown-preview--remote-clients)))
(maphash (lambda (ws-uuid websocket)
(unless (websocket-openp websocket))
(remhash ws-uuid markdown-preview--remote-clients))
markdown-preview--remote-clients))
(defun markdown-preview--start-websocket-server ()
"Start `markdown-preview' websocket server."
@ -186,15 +232,21 @@
markdown-preview-ws-port
:host markdown-preview-ws-host
:on-message (lambda (websocket frame)
(mapc (lambda (ws) (websocket-send ws frame))
markdown-preview--remote-clients))
:on-open (lambda (websocket)
(push websocket markdown-preview--remote-clients)
(markdown-preview--send-preview-to websocket))
(let ((ws-frame-text (websocket-frame-payload frame)))
(if (string-prefix-p "MDPM-Register-UUID: " ws-frame-text)
(let ((ws-uuid (substring ws-frame-text 20)))
(puthash ws-uuid websocket markdown-preview--remote-clients)
(markdown-preview--send-preview-to websocket ws-uuid))
(progn
(websocket-send
(gethash markdown-preview--uuid markdown-preview--remote-clients)
frame))
)))
:on-open (lambda (websocket) (message "Websocket opened"))
:on-error (lambda (websocket type err) (message (concat "====> Error:" err)))
:on-close (lambda (websocket) (markdown-preview--drop-closed-clients))))
(add-hook 'kill-emacs-hook 'markdown-preview--stop-websocket-server)
(markdown-preview--open-browser-preview)))
(add-hook 'kill-emacs-hook 'markdown-preview--stop-websocket-server))
(markdown-preview--open-browser-preview))
(defun markdown-preview--start-local-client ()
"Start the `markdown-preview' local client."
@ -207,12 +259,12 @@
:on-close (lambda (websocket)
(setq markdown-preview--local-client nil))))))
(defun markdown-preview--send-preview ()
(defun markdown-preview--send-preview (preview-uuid)
"Send the `markdown-preview' preview to clients."
(when (bound-and-true-p markdown-preview-mode)
(markdown-preview--send-preview-to markdown-preview--local-client)))
(markdown-preview--send-preview-to markdown-preview--local-client preview-uuid)))
(defun markdown-preview--send-preview-to (websocket)
(defun markdown-preview--send-preview-to (websocket preview-uuid)
"Send the `markdown-preview' to a specific WEBSOCKET."
(let ((mark-position-percent
(number-to-string
@ -221,8 +273,13 @@
(/
(float (- (line-number-at-pos) (/ (count-screen-lines (window-start) (point)) 2)))
(count-lines (point-min) (point-max))))))))
(markdown markdown-output-buffer-name)
(with-current-buffer (get-buffer markdown-output-buffer-name)
(let ((md-buffer (gethash preview-uuid markdown-preview--preview-buffers)))
(when md-buffer
(with-current-buffer md-buffer
(markdown markdown-output-buffer-name))))
(with-current-buffer markdown-output-buffer-name ;; get-buffer
(websocket-send-text websocket
(concat
"<div>"
@ -237,20 +294,28 @@
(defun markdown-preview--start ()
"Start `markdown-preview' mode."
(setq-local markdown-preview--uuid (uuidgen-1))
(puthash markdown-preview--uuid (buffer-name) markdown-preview--preview-buffers)
;; (gethash markdown-preview--uuid markdown-preview--preview-buffers)
(markdown-preview--read-preview-template
markdown-preview--uuid
(expand-file-name markdown-preview-file-name default-directory))
(markdown-preview--start-websocket-server)
(markdown-preview--start-local-client)
(markdown-preview--start-http-server markdown-preview-http-port)
(setq markdown-preview--idle-timer
(run-with-idle-timer 2 t (lambda () (markdown-preview--send-preview))))
(add-hook 'after-save-hook 'markdown-preview--send-preview nil t))
(run-with-idle-timer 2 t (lambda ()
(when markdown-preview--uuid
(markdown-preview--send-preview markdown-preview--uuid)))))
(add-hook 'after-save-hook (lambda ()
(when markdown-preview--uuid
(markdown-preview--send-preview markdown-preview--uuid))) nil t))
(defun markdown-preview--stop ()
"Stop `markdown-preview' mode."
(remove-hook 'after-save-hook 'markdown-preview--send-preview t)
(markdown-preview--stop-idle-timer)
(ws-stop-all)
(remhash markdown-preview--uuid markdown-preview--preview-buffers)
(let ((preview-file (concat (file-name-directory (buffer-file-name)) markdown-preview-file-name)))
(if (file-exists-p preview-file)
(delete-file preview-file))))
@ -265,7 +330,8 @@
(defun markdown-preview-cleanup ()
"Cleanup `markdown-preview' mode."
(interactive)
(markdown-preview--stop-websocket-server))
(markdown-preview--stop-websocket-server)
(markdown-preview--stop-http-server))
;;;###autoload
(define-minor-mode markdown-preview-mode

1
preview.html
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@ -12,6 +12,7 @@
var socket = new WebSocket("ws://${WS_HOST}:${WS_PORT}");
socket.onopen = function() {
console.log("Connection established.");
socket.send("MDPM-Register-UUID: ${MD_UUID}");
};
socket.onclose = function(event) {
if (event.wasClean) {