The build dialog should show the result from last build when opening

nw/constants/constants.py

@@ -45,6 +45,7 @@ class nwFiles():
     INDEX_FILE  = "tagsIndex.json"
     OPTS_FILE   = "guiOptions.json"
     RECENT_FILE = "recentProjects.json"
+    BUILD_CACHE = "prevBuild.json"
 
 # END Class nwFiles
 

nw/gui/build.py

@@ -26,6 +26,7 @@
 """
 
 import logging
+import json
 import nw
 
 from os import path
@@ -45,7 +46,7 @@ from PyQt5.QtWidgets import (
 from nw.gui.additions import QSwitch
 from nw.core import ToHtml
 from nw.constants import (
-    nwAlert, nwItemType, nwItemLayout, nwItemClass
+    nwAlert, nwFiles, nwItemType, nwItemLayout, nwItemClass
 )
 
 logger = logging.getLogger(__name__)
@@ -372,6 +373,15 @@ class GuiBuildNovel(QDialog):
 
         logger.debug("GuiBuildNovel initialisation complete")
 
+        # Load from Cache
+        if self._loadCache():
+            self.docView.setStyleSheet(self.htmlStyle)
+            self.docView.setContent(self.htmlText)
+        else:
+            self.htmlText = []
+            self.htmlStyle = []
+            self.nwdText = []
+
         return
 
     ##
@@ -459,6 +469,8 @@ class GuiBuildNovel(QDialog):
         self.docView.setStyleSheet(self.htmlStyle)
         self.docView.setContent(self.htmlText)
 
+        self._saveCache()
+
         return
 
     def _checkInclude(self, theItem, noteFiles, novelFiles, ignoreFlag):
@@ -683,6 +695,60 @@ class GuiBuildNovel(QDialog):
             self.textSize.setValue(theFont.pointSize())
         return
 
+    def _loadCache(self):
+        """Save the current data to cache.
+        """
+        buildCache = path.join(self.theProject.projCache, nwFiles.BUILD_CACHE)
+        dataCount = 0
+        if path.isfile(buildCache):
+
+            logger.debug("Loading build cache")
+            try:
+                with open(buildCache, mode="r", encoding="utf8") as inFile:
+                    theJson = inFile.read()
+                theData = json.loads(theJson)
+            except Exception as e:
+                logger.error("Failed to load build cache")
+                logger.error(str(e))
+                return False
+
+            if "htmlText" in theData.keys():
+                self.htmlText = theData["htmlText"]
+                dataCount += 1
+            if "htmlStyle" in theData.keys():
+                self.htmlStyle = theData["htmlStyle"]
+                dataCount += 1
+            if "nwdText" in theData.keys():
+                self.nwdText = theData["nwdText"]
+                dataCount += 1
+
+        return dataCount == 3
+
+    def _saveCache(self):
+        """Save the current data to cache.
+        """
+        buildCache = path.join(self.theProject.projCache, nwFiles.BUILD_CACHE)
+
+        if self.mainConf.debugInfo:
+            nIndent = 2
+        else:
+            nIndent = None
+
+        logger.debug("Saving build cache")
+        try:
+            with open(buildCache, mode="w+", encoding="utf8") as outFile:
+                outFile.write(json.dumps({
+                    "htmlText"  : self.htmlText,
+                    "htmlStyle" : self.htmlStyle,
+                    "nwdText"   : self.nwdText,
+                }, indent=nIndent))
+        except Exception as e:
+            logger.error("Failed to save build cache")
+            logger.error(str(e))
+            return False
+
+        return True
+
     def _doClose(self):
         """Close button was clicked.
         """
@@ -762,6 +828,11 @@ class GuiBuildNovelDocView(QTextBrowser):
 
         self.qDocument = self.document()
         self.qDocument.setDocumentMargin(self.mainConf.textMargin)
+        self.setPlaceholderText(
+            "This area will show the content of the document to be "
+            "exported or printed. Press the \"Build Novel Project\" "
+            "button to generate content."
+        )
 
         theFont = QFont()
         if self.mainConf.textFont is None: