From 5a76d4982dc071e3ad0be295d804cb1ee1dbac5f Mon Sep 17 00:00:00 2001
From: "Veronica K. B. Olsen" <1619840+vkbo@users.noreply.github.com>
Date: Wed, 30 Oct 2019 21:05:28 +0100
Subject: [PATCH] Ctrl+Enter on a tag name now opens the file in the view pane

---
 nw/gui/doceditor.py | 31 +++++++++++++++++++++++++++++--
 nw/gui/docviewer.py | 18 ++++++++++++++++++
 2 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/nw/gui/doceditor.py b/nw/gui/doceditor.py
index 44238fc5..ed85cb3a 100644
--- a/nw/gui/doceditor.py
+++ b/nw/gui/doceditor.py
@@ -81,8 +81,8 @@ class GuiDocEditor(QTextEdit):
 
         # Custom Shortcuts
         QShortcut(QKeySequence("Ctrl+."), self, context=Qt.WidgetShortcut, activated=self._openSpellContext)
-        # QShortcut(Qt.Key_Return | Qt.ControlModifier, self, context=Qt.WidgetShortcut, activated=self._insertHardBreak)
-        # QShortcut(Qt.Key_Enter  | Qt.ControlModifier, self, context=Qt.WidgetShortcut, activated=self._insertHardBreak)
+        QShortcut(Qt.Key_Return | Qt.ControlModifier, self, context=Qt.WidgetShortcut, activated=self._followTag)
+        QShortcut(Qt.Key_Enter  | Qt.ControlModifier, self, context=Qt.WidgetShortcut, activated=self._followTag)
 
         # Set Up Word Count Thread and Timer
         self.wcInterval = self.mainConf.wordCountTimer
@@ -356,6 +356,33 @@ class GuiDocEditor(QTextEdit):
     #  Internal Functions
     ##
 
+    def _followTag(self):
+        """Activated by Ctrl+Enter. Checks that we're in a block starting with '@'. We then find the
+        word under the cursor and check that it is after the ':'. If all this is fine, we have a tag
+        and can tell the document viewer to try and find and load the file where the tag is defined.
+        """
+
+        theCursor = self.textCursor()
+        theBlock  = theCursor.block()
+        theText   = theBlock.text()
+
+        if len(theText) == 0:
+            return False
+
+        if theText.startswith("@"):
+
+            theCursor.select(QTextCursor.WordUnderCursor)
+            theWord = theCursor.selectedText()
+            cPos = theText.find(":")
+            wPos = theCursor.selectionStart() - theBlock.position()
+            if wPos <= cPos:
+                return False
+
+            logger.verbose("Attempting to follow tag '%s'" % theWord)
+            self.theParent.docViewer.loadFromTag(theWord)
+
+        return True
+
     def _insertHardBreak(self):
         theCursor = self.textCursor()
         theCursor.beginEditBlock()
diff --git a/nw/gui/docviewer.py b/nw/gui/docviewer.py
index 76c57e67..39342036 100644
--- a/nw/gui/docviewer.py
+++ b/nw/gui/docviewer.py
@@ -115,6 +115,24 @@ class GuiDocViewer(QTextBrowser):
 
         return True
 
+    def loadFromTag(self, theTag):
+
+        logger.debug("Loading document from tag '%s'" % theTag)
+
+        if theTag in self.theParent.theIndex.tagIndex.keys():
+            theTarget = self.theParent.theIndex.tagIndex[theTag]
+        else:
+            logger.debug("The tag was not found in the index")
+            return False
+
+        if len(theTarget) != 3:
+            # Just to make sure the index is not messed up
+            return False
+
+        self.loadText(theTarget[1])
+
+        return True
+
     ##
     #  Internal Functions
     ##