fix #32 drop dep on uuidgen; replace with uuid function

Add workaround for Emacs 26 async network-server-process issues

README.md

@@ -75,4 +75,3 @@ Markdown preview in emacs features:
 * [markdown-mode.el](https://github.com/defunkt/markdown-mode)
 * [websocket.el](https://github.com/ahyatt/emacs-websocket)
 * [web-server.el](https://github.com/eschulte/emacs-web-server)
-* [uuidgen](https://github.com/kanru/uuidgen-el)

markdown-preview-mode.el

@@ -5,8 +5,8 @@
 ;; Author: Igor Shymko <igor.shimko@gmail.com>
 ;; URL: https://github.com/ancane/markdown-preview-mode
 ;; Keywords: markdown, gfm, convenience
-;; Version: 0.9
-;; Package-Requires: ((emacs "24.3") (websocket "1.6") (markdown-mode "2.0") (cl-lib "0.5") (web-server "0.1.1") (uuidgen "0.3"))
+;; Version: 0.9.2
+;; Package-Requires: ((emacs "24.3") (websocket "1.6") (markdown-mode "2.0") (cl-lib "0.5") (web-server "0.1.1") )
 
 ;; This file is not part of GNU Emacs.
 
@@ -30,11 +30,11 @@
 ;;
 ;;; Code:
 
+(eval-when-compile (require 'cl))
 (require 'cl-lib)
 (require 'websocket)
 (require 'markdown-mode)
 (require 'web-server)
-(require 'uuidgen)
 
 (defgroup markdown-preview nil
   "Markdown preview mode."
@@ -96,7 +96,7 @@
   "`markdown-preview' local client.")
 
 (defvar markdown-preview--remote-clients (make-hash-table :test 'equal)
-  "Remote clients hashtable. UUID -> WS")
+  "Remote clients hashtable. UUID -> WS.")
 
 (defvar markdown-preview--home-dir (file-name-directory load-file-name)
   "`markdown-preview-mode' home directory.")
@@ -108,21 +108,23 @@
   "Unique preview identifier.")
 
 (defvar markdown-preview--preview-buffers (make-hash-table :test 'equal)
-  "Preview buffers hashtable. UUID -> buffer-name.")
+  "Preview buffers hashtable. UUID -> buffer name.")
 
 (defun markdown-preview--stop-idle-timer ()
   "Stop the `markdown-preview' idle timer."
   (when (timerp markdown-preview--idle-timer)
     (cancel-timer markdown-preview--idle-timer)))
 
-(defun markdown-preview--css-links ()
+(defun markdown-preview--css ()
   "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)))
     (mapconcat
      (lambda (x)
-       (concat "<link rel=\"stylesheet\" type=\"text/css\" href=\"" x "\">"))
+       (if (string-match-p "^[\n\t ]*<style" x)
+           x
+         (concat "<link rel=\"stylesheet\" type=\"text/css\" href=\"" x "\">")))
      all-styles
      "\n")))
 
@@ -130,20 +132,21 @@
   "Get list of javascript script tags for preview."
   (mapconcat
    (lambda (x)
-     (concat
-      "<script src=\"" (if (consp x) (car x) x) "\""
-      (if (consp x) (format " %s" (cdr x)))
-      "></script>"))
+     (if (string-match-p "^[\n\t ]*<script" x)
+         x
+       (concat
+        "<script src=\"" (if (consp x) (car x) x) "\""
+        (if (consp x) (format " %s" (cdr x)))
+        "></script>")))
    markdown-preview-javascript
    "\n"))
 
 (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."
+  "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))
     (when (search-forward "${MD_STYLE}" nil t)
-        (replace-match (markdown-preview--css-links) t))
+        (replace-match (markdown-preview--css) t))
     (when (search-forward "${MD_JS}" nil t)
         (replace-match (markdown-preview--scripts) t))
     (when (search-forward "${WS_HOST}" nil t)
@@ -154,10 +157,21 @@ rendered copy to PREVIEW-FILE, ready to be open in browser."
         (replace-match (format "%s" preview-uuid) t))
     (buffer-string)))
 
+;; Emacs 26 async network workaround
+(defun markdown-preview--fix-network-process-wait (plist)
+  "Ensure PLIST contain :nowait nil."
+  (if (and (>= emacs-major-version 26)
+	   (equal (plist-get plist :name) "ws-server")
+	   (plist-get plist :server)
+	   (plist-get plist :nowait))
+      (plist-put plist :nowait nil)
+	plist))
+
 (defun markdown-preview--start-http-server (port)
   "Start http server at PORT to serve preview file via http."
   (unless markdown-preview--http-server
     (lexical-let ((docroot default-directory))
+      (advice-add 'make-network-process :filter-args #'markdown-preview--fix-network-process-wait)
       (setq markdown-preview--http-server
             (ws-start
              (lambda (request)
@@ -181,7 +195,8 @@ rendered copy to PREVIEW-FILE, ready to be open in browser."
                            (ws-send-file process filename)
                          (ws-send-404 process)
                          ))))))
-             markdown-preview-http-port nil :host markdown-preview-http-host)))))
+             markdown-preview-http-port nil :host markdown-preview-http-host))
+      (advice-remove 'make-network-process #'my-filter))))
 
 (defun markdown-preview--parse-uuid (headers)
   "Find uuid query param in HEADERS."
@@ -267,12 +282,12 @@ rendered copy to PREVIEW-FILE, ready to be open in browser."
                        (setq markdown-preview--local-client nil))))))
 
 (defun markdown-preview--send-preview (preview-uuid)
-  "Send the `markdown-preview' preview to clients."
+  "Send the `markdown-preview' with PREVIEW-UUID preview to clients."
   (when (bound-and-true-p markdown-preview-mode)
     (markdown-preview--send-preview-to markdown-preview--local-client preview-uuid)))
 
 (defun markdown-preview--send-preview-to (websocket preview-uuid)
-  "Send the `markdown-preview' to a specific WEBSOCKET."
+  "Send the `markdown-preview' with PREVIEW-UUID to a specific WEBSOCKET."
   (let ((mark-position-percent
          (number-to-string
           (truncate
@@ -302,7 +317,7 @@ rendered copy to PREVIEW-FILE, ready to be open in browser."
 
 (defun markdown-preview--start ()
   "Start `markdown-preview' mode."
-  (setq-local markdown-preview--uuid (uuidgen-1))
+  (setq-local markdown-preview--uuid (markdown-preview--random-uuid))
   (puthash markdown-preview--uuid (buffer-name) markdown-preview--preview-buffers)
   ;;  (gethash markdown-preview--uuid markdown-preview--preview-buffers)
   (markdown-preview--read-preview-template
@@ -328,6 +343,37 @@ rendered copy to PREVIEW-FILE, ready to be open in browser."
     (if (file-exists-p preview-file)
         (delete-file preview-file))))
 
+(defun markdown-preview--random-uuid ()
+  "Insert a UUID using a simple hashing of variable data.
+Example of a UUID: 1df63142-a513-c850-31a3-535fc3520c3d
+Note: this code uses https://en.wikipedia.org/wiki/Md5,
+which is not cryptographically safe. I'm not sure what's
+the implication of its use here.
+Version 2015-01-30
+URL `http://ergoemacs.org/emacs/elisp_generate_uuid.html'"
+  ;; by Christopher Wellons, 2011-11-18. Editted by Xah Lee.
+  ;; Edited by Hideki Saito further to generate all valid variants for "N" in xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx format.
+  ;; (interactive)
+  (let ((myStr (md5 (format "%s%s%s%s%s%s%s%s%s%s"
+                            (user-uid)
+                            (emacs-pid)
+                            (system-name)
+                            (user-full-name)
+                            (current-time)
+                            (emacs-uptime)
+                            (garbage-collect)
+                            (buffer-string)
+                            (random)
+                            (recent-keys)))))
+
+    (format "%s-%s-4%s-%s%s-%s"
+            (substring myStr 0 8)
+            (substring myStr 8 12)
+            (substring myStr 13 16)
+            (format "%x" (+ 8 (random 4)))
+            (substring myStr 17 20)
+            (substring myStr 20 32))))
+
 ;;;###autoload
 (defun markdown-preview-open-browser ()
   "Open the `markdown-preview' in the browser."

preview.html

@@ -23,7 +23,7 @@
              console.log('Code: ' + event.code + ' reason: ' + event.reason);
          };
          socket.onmessage = function(event) {
-             $("#markdown-body").html($(event.data).find("#content").html());
+             $("#markdown-body").html($(event.data).find("#content").html()).trigger('mdContentChange');
              var scroll = $(document).height() * ($(event.data).find("#position-percentage").html() / 100);
              $("html, body").animate({ scrollTop: scroll }, 600);
          };