Speed up site generation

.gitignore

@@ -0,0 +1,10 @@
+# Automatic backup files
+*~
+
+# Desktop preferences
+.Desktop
+.DS_Store
+
+.idea
+node_modules
+vimhl.js.map

package.json

@@ -19,13 +19,22 @@
     "email": "ppwwyyxxc@gmail.com",
     "url": "http://ppwwyyxx.com"
   },
+  "contributors": [
+    {
+      "name": "Stuart McCulloch Anderson",
+      "url": "http://nxfifteen.me.uk",
+      "email": "stuart@nxfifteen.me.uk"
+    }
+  ],
   "license": "GPLv2",
   "engines": {
     "hexo": ">= 1.0.0"
   },
   "dependencies": {
+    "cheerio": "*",
+    "crypto": "0.0.3",
     "temp": "*",
-    "cheerio": "*"
+    "wrench": "^1.5.8"
   },
   "readme": "## Introduction\n\nThis is a [hexo](https://github.com/tommy351/hexo)\ntag plugin which allows you to use vim syntax highlight to highlight code inside markdown.\n\nHexo is a static blogging system written in Node.js, it uses [highlight.js](http://softwaremaniacs.org/soft/highlight/en/)\nby default to render code.\nBut lots of languages are not supported by highlight.js (but always supported by vim with proper plugins).\nIn that case, you can use this instead.\n\n## Installation\n\nYou need to have vim properly installed and configured, since this program will directly call vim.\n\n<!--\n   -Also, you should have [hexo-renderer-coffeescript](https://npmjs.org/package/hexo-renderer-coffeescript) installed.\n   -->\n\nTo install, run the following command in the root directory of hexo:\n```\nnpm install hexo-tag-vimhighlight --save\n```\n\nAnd add this plugin in your ``_config.yml``.\n\n## Usage\n\nSpecify the code filetype, and whether to use line number in your markdown source file, in\nthe common format of tag plugins:\n\n\t{% vimhl vim true %}\n\tif ! has(\"gui_running\")                \" fix alt key under terminal\n\t\tfor i in range(48, 57) + range(65, 90) + range(97, 122)\n\t\t\texec \"set <A-\" . nr2char(i) . \">=\u001b\" . nr2char(i)\n\t\tendfor\n\tendif\n\t{% endvimhl %}\n\nBy default, line number will not be displayed, you can use ``{% vimhl vim %}`` for short.\n\nThis program will run vim to highlight the code, therefore the generating of pages\nwill probably take much longer time. (It seems that hexo doesn't support parallel rendering.)\n",
   "readmeFilename": "README.md",

vimhl.coffee

@@ -6,6 +6,8 @@ execSync = require('child_process').execSync
 fs = require 'fs'
 temp = require 'temp'
 cheerio = require 'cheerio'
+crypto = require('crypto')
+wrench = require('wrench')
 
 formatFilter = (data) ->
   # trim the extra empty line
@@ -24,28 +26,51 @@ formatFilter = (data) ->
   return data
 
 vimHighlight = (data, ft, useLineN) ->
-  if useLineN
-    lineOpt = ' +"let g:html_number_lines=1" '
+  cacheFileHash = crypto.createHash('md5');
+  cacheFileHash.update(data);
+  cacheFileHash.update(ft);
+  if (useLineN)
+    cacheFileHash.update("show line numbers");
   else
-    lineOpt = ' +"let g:html_number_lines=0" '
+    cacheFileHash.update("no line numbers");
 
-  info = temp.openSync({suffix: '.' + ft})
-  fs.writeSync(info.fd, data)
-  fs.closeSync info.fd
+  cacheFileName = cacheFileHash.digest('hex') + '.html';
 
-  opt = ' +"let g:html_no_progress=1" +"let g:html_ignore_folding=1" +"let g:html_use_css=0" +"let g:html_pre_wrap=0" ' + lineOpt
-  execSync 'vim -X -i NONE -f ' + opt + ' +"TOhtml" -cwqa ' + info.path + ' > /dev/null 2>&1'
+  _storageTemplateFolder = __dirname + '/../../data/vimHighlight/';
+  if (!fs.existsSync(_storageTemplateFolder))
+    wrench.mkdirSyncRecursive(_storageTemplateFolder, '0777');
 
-  htmlPath = info.path + '.html'
-  result = fs.readFileSync htmlPath
-  result = String result
-  fs.unlink htmlPath, (err) ->
+  if (!fs.existsSync(_storageTemplateFolder + '/' + cacheFileName))
+    if useLineN
+      lineOpt = ' +"let g:html_number_lines=1" '
+    else
+      lineOpt = ' +"let g:html_number_lines=0" '
 
-  fs.unlink info.path, (err) ->
-  $ = cheerio.load result
+    info = temp.openSync({suffix: '.' + ft})
+    fs.writeSync(info.fd, data)
+    fs.closeSync info.fd
+
+    opt = ' +"let g:html_no_progress=1" +"let g:html_ignore_folding=1" +"let g:html_use_css=0" +"let g:html_pre_wrap=0" ' + lineOpt
+    execSync 'vim -X -i NONE -f ' + opt + ' +"TOhtml" -cwqa ' + info.path + ' > /dev/null 2>&1'
+
+    htmlPath = info.path + '.html'
+    result = fs.readFileSync htmlPath
+    result = String result
+    fs.unlink htmlPath, (err) ->
+
+    fs.unlink info.path, (err) ->
+    $ = cheerio.load result
+
+    ret = $('body')
+    ret = formatFilter ret.html()
+
+    cacheFileFd = fs.openSync(_storageTemplateFolder + '/' + cacheFileName, 'w', '0666');
+    fs.writeSync(cacheFileFd, ret);
+    fs.closeSync(cacheFileFd);
+  else
+    result = fs.readFileSync(_storageTemplateFolder + '/' + cacheFileName);
+    ret = String(result);
 
-  ret = $('body')
-  ret = formatFilter ret.html()
   return ret
 
 exports.vimHighlight = vimHighlight