From c7cb95d18b6802a6e62bc6b44260bbf3d90bc7ab Mon Sep 17 00:00:00 2001
From: Le Tan <tamlokveer@gmail.com>
Date: Wed, 29 Nov 2017 21:45:06 +0800
Subject: [PATCH] Markdown Highlighter: speed up at first parse

---
 src/hgmarkdownhighlighter.cpp | 19 +++++++++++++++----
 src/hgmarkdownhighlighter.h   |  3 +++
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/src/hgmarkdownhighlighter.cpp b/src/hgmarkdownhighlighter.cpp
index a4e8d497..a0266e64 100644
--- a/src/hgmarkdownhighlighter.cpp
+++ b/src/hgmarkdownhighlighter.cpp
@@ -29,9 +29,16 @@ HGMarkdownHighlighter::HGMarkdownHighlighter(const QVector<HighlightingStyle> &s
                                              const QHash<QString, QTextCharFormat> &codeBlockStyles,
                                              int waitInterval,
                                              QTextDocument *parent)
-    : QSyntaxHighlighter(parent), highlightingStyles(styles),
-      m_codeBlockStyles(codeBlockStyles), m_numOfCodeBlockHighlightsToRecv(0),
-      parsing(0), waitInterval(waitInterval), content(NULL), capacity(0), result(NULL)
+    : QSyntaxHighlighter(parent),
+      highlightingStyles(styles),
+      m_codeBlockStyles(codeBlockStyles),
+      m_numOfCodeBlockHighlightsToRecv(0),
+      parsing(0),
+      waitInterval(waitInterval),
+      m_firstParse(true),
+      content(NULL),
+      capacity(0),
+      result(NULL)
 {
     codeBlockStartExp = QRegExp(VUtils::c_fencedCodeBlockStartRegExp);
     codeBlockEndExp = QRegExp(VUtils::c_fencedCodeBlockEndRegExp);
@@ -541,11 +548,15 @@ void HGMarkdownHighlighter::timerTimeout()
 {
     qDebug() << "HGMarkdownHighlighter start a new parse";
     parse();
-    if (!updateCodeBlocks()) {
+    if (!updateCodeBlocks() || m_firstParse) {
         rehighlight();
     }
 
     highlightChanged();
+
+    if (m_firstParse) {
+        m_firstParse = false;
+    }
 }
 
 void HGMarkdownHighlighter::updateHighlight()
diff --git a/src/hgmarkdownhighlighter.h b/src/hgmarkdownhighlighter.h
index f51132f8..e8a83402 100644
--- a/src/hgmarkdownhighlighter.h
+++ b/src/hgmarkdownhighlighter.h
@@ -190,6 +190,9 @@ private:
     QTimer *timer;
     int waitInterval;
 
+    // Whether this is the first parse.
+    bool m_firstParse;
+
     char *content;
     int capacity;
     pmh_element **result;