Feature/syntax hilight on PDF (#1308)

Fix syntax highlight on PDF

Co-authored-by: kondouagi <kondouagi@gmail.com>

Author: Yukaii

lib/config/index.js

@@ -200,6 +200,7 @@ config.sslCAPath.forEach(function (capath, i, array) {
   array[i] = path.resolve(appRootPath, capath)
 })
 
+config.appRootPath = appRootPath
 config.sslCertPath = path.resolve(appRootPath, config.sslCertPath)
 config.sslKeyPath = path.resolve(appRootPath, config.sslKeyPath)
 config.dhParamPath = path.resolve(appRootPath, config.dhParamPath)

lib/response.js

@@ -316,17 +316,22 @@ function actionPDF (req, res, note) {
   var content = extracted.markdown
   var title = models.Note.decodeTitle(note.title)
 
+  var highlightCssPath = path.join(config.appRootPath, '/node_modules/highlight.js/styles/github-gist.css')
+
   if (!fs.existsSync(config.tmpPath)) {
     fs.mkdirSync(config.tmpPath)
   }
-  var path = config.tmpPath + '/' + Date.now() + '.pdf'
+  var pdfPath = config.tmpPath + '/' + Date.now() + '.pdf'
   content = content.replace(/\]\(\//g, '](' + url + '/')
-  markdownpdf().from.string(content).to(path, function () {
-    if (!fs.existsSync(path)) {
-      logger.error('PDF seems to not be generated as expected. File doesn\'t exist: ' + path)
+  var markdownpdfOptions = {
+    highlightCssPath: highlightCssPath
+  }
+  markdownpdf(markdownpdfOptions).from.string(content).to(pdfPath, function () {
+    if (!fs.existsSync(pdfPath)) {
+      logger.error('PDF seems to not be generated as expected. File doesn\'t exist: ' + pdfPath)
       return errorInternalError(res)
     }
-    var stream = fs.createReadStream(path)
+    var stream = fs.createReadStream(pdfPath)
     var filename = title
     // Be careful of special characters
     filename = encodeURIComponent(filename)
@@ -336,7 +341,7 @@ function actionPDF (req, res, note) {
     res.setHeader('Content-Type', 'application/pdf; charset=UTF-8')
     res.setHeader('X-Robots-Tag', 'noindex, nofollow') // prevent crawling
     stream.pipe(res)
-    fs.unlinkSync(path)
+    fs.unlinkSync(pdfPath)
   })
 }