Disable 'Syntax Highlighting' and 'Show Full File' on big files

If the file is huge, we disable these features.  A tooltip tells
the user why they cannot access them.

Change-Id: Icec1857844d62456c7abfd8b0d3dd753198330dd
Signed-off-by: Shawn O. Pearce <sop@google.com>

gerrit-common/src/main/java/com/google/gerrit/common/data/PatchScript.java

@@ -14,6 +14,8 @@
 
 package com.google.gerrit.common.data;
 
+import static com.google.gerrit.reviewdb.AccountGeneralPreferences.WHOLE_FILE_CONTEXT;
+
 import com.google.gerrit.common.data.PatchScriptSettings.Whitespace;
 import com.google.gerrit.prettify.client.ClientSideFormatter;
 import com.google.gerrit.prettify.common.EditList;
@@ -28,7 +30,6 @@ import com.google.gerrit.reviewdb.Patch.ChangeType;
 import org.eclipse.jgit.diff.Edit;
 
 import java.util.List;
-import static com.google.gerrit.reviewdb.AccountGeneralPreferences.*;
 
 public class PatchScript {
   public static enum DisplayMethod {
@@ -48,12 +49,13 @@ public class PatchScript {
   protected DisplayMethod displayMethodB;
   protected CommentDetail comments;
   protected List<Patch> history;
+  protected boolean hugeFile;
 
   public PatchScript(final Change.Key ck, final ChangeType ct, final String on,
       final String nn, final List<String> h, final PatchScriptSettings s,
       final SparseFileContent ca, final SparseFileContent cb,
       final List<Edit> e, final DisplayMethod ma, final DisplayMethod mb,
-      final CommentDetail cd, final List<Patch> hist) {
+      final CommentDetail cd, final List<Patch> hist, final boolean hf) {
     changeId = ck;
     changeType = ct;
     oldName = on;
@@ -67,6 +69,7 @@ public class PatchScript {
     displayMethodB = mb;
     comments = cd;
     history = hist;
+    hugeFile = hf;
   }
 
   protected PatchScript() {
@@ -116,6 +119,10 @@ public class PatchScript {
     settings = s;
   }
 
+  public boolean isHugeFile() {
+    return hugeFile;
+  }
+
   public boolean isIgnoreWhitespace() {
     return settings.getWhitespace() != Whitespace.IGNORE_NONE;
   }

gerrit-gwtui/src/main/java/com/google/gerrit/client/patches/PatchConstants.java

@@ -31,6 +31,7 @@ public interface PatchConstants extends Constants {
   String patchHeaderNew();
 
   String patchHistoryTitle();
+  String disabledOnLargeFiles();
 
   String upToChange();
   String linePrev();

gerrit-gwtui/src/main/java/com/google/gerrit/client/patches/PatchConstants.properties

@@ -13,6 +13,7 @@ noDifference = No Differences
 patchHeaderOld = Old Version
 patchHeaderNew = New Version
 patchHistoryTitle = Patch History
+disabledOnLargeFiles = Disabled on very large source files.
 
 upToChange = Up to change
 linePrev = Previous line

gerrit-gwtui/src/main/java/com/google/gerrit/client/patches/PatchScreen.java

@@ -447,6 +447,7 @@ public abstract class PatchScreen extends Screen implements
       contentTable.finishDisplay();
     }
     showPatch(hasDifferences);
+    settingsPanel.setEnableSmallFileFeatures(!script.isHugeFile());
     settingsPanel.setEnabled(true);
     lastScript = script;
 

gerrit-gwtui/src/main/java/com/google/gerrit/client/patches/PatchScriptSettingsPanel.java

@@ -54,6 +54,7 @@ public class PatchScriptSettingsPanel extends Composite implements
   }
 
   private PatchScriptSettings value;
+  private boolean enableSmallFileFeatures = true;
 
   @UiField
   ListBox ignoreWhitespace;
@@ -126,10 +127,33 @@ public class PatchScriptSettingsPanel extends Composite implements
         ((FocusWidget) w).setEnabled(on);
       }
     }
+    toggleEnabledStatus(on);
   }
 
-  public CheckBox getSyntaxHighlightingCheckBox() {
+  public void setEnableSmallFileFeatures(final boolean on) {
-    return syntaxHighlighting;
+    enableSmallFileFeatures = on;
+    if (enableSmallFileFeatures) {
+      final PrettySettings p = getValue().getPrettySettings();
+
+      syntaxHighlighting.setValue(p.isSyntaxHighlighting());
+      showFullFile.setValue(getValue().getContext() == WHOLE_FILE_CONTEXT);
+    } else {
+      syntaxHighlighting.setValue(false);
+      showFullFile.setValue(false);
+    }
+    toggleEnabledStatus(update.isEnabled());
+  }
+
+  private void toggleEnabledStatus(boolean on) {
+    on &= enableSmallFileFeatures;
+
+    syntaxHighlighting.setEnabled(on);
+    showFullFile.setEnabled(on);
+
+    final String title =
+        enableSmallFileFeatures ? null : PatchUtil.C.disabledOnLargeFiles();
+    syntaxHighlighting.setTitle(title);
+    showFullFile.setTitle(title);
   }
 
   public CheckBox getReviewedCheckBox() {
@@ -144,11 +168,16 @@ public class PatchScriptSettingsPanel extends Composite implements
     final PrettySettings p = s.getPrettySettings();
 
     setIgnoreWhitespace(s.getWhitespace());
-    showFullFile.setValue(s.getContext() == WHOLE_FILE_CONTEXT);
+    if (enableSmallFileFeatures) {
+      showFullFile.setValue(s.getContext() == WHOLE_FILE_CONTEXT);
+      syntaxHighlighting.setValue(p.isSyntaxHighlighting());
+    } else {
+      showFullFile.setValue(false);
+      syntaxHighlighting.setValue(false);
+    }
 
     tabWidth.setIntValue(p.getTabSize());
     colWidth.setIntValue(p.getLineLength());
-    syntaxHighlighting.setValue(p.isSyntaxHighlighting());
     intralineDifference.setValue(p.isIntralineDifference());
     whitespaceErrors.setValue(p.isShowWhiteSpaceErrors());
     showTabs.setValue(p.isShowTabs());

gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchScriptBuilder.java

@@ -118,7 +118,7 @@ class PatchScriptBuilder {
       return new PatchScript(change.getKey(), content.getChangeType(), content
           .getOldName(), content.getNewName(), content.getHeaderLines(),
           settings, a.dst, b.dst, Collections.<Edit> emptyList(),
-          a.displayMethod, b.displayMethod, comments, history);
+          a.displayMethod, b.displayMethod, comments, history, false);
     }
 
     a.path = oldName(content);
@@ -130,6 +130,7 @@ class PatchScriptBuilder {
     edits = new ArrayList<Edit>(content.getEdits());
     ensureCommentsVisible(comments);
 
+    boolean hugeFile = false;
     if (a.mode == FileMode.GITLINK || b.mode == FileMode.GITLINK) {
 
     } else if (a.src == b.src && a.size() <= context
@@ -152,6 +153,7 @@ class PatchScriptBuilder {
         settings.setContext(Math.min(25, context));
         settings.getPrettySettings().setSyntaxHighlighting(false);
         context = settings.getContext();
+        hugeFile = true;
 
       } else if (settings.getPrettySettings().isSyntaxHighlighting()) {
         // In order to syntax highlight the file properly we need to
@@ -166,7 +168,7 @@ class PatchScriptBuilder {
     return new PatchScript(change.getKey(), content.getChangeType(), content
         .getOldName(), content.getNewName(), content.getHeaderLines(),
         settings, a.dst, b.dst, edits, a.displayMethod, b.displayMethod,
-        comments, history);
+        comments, history, hugeFile);
   }
 
   private static String oldName(final PatchListEntry entry) {