Add a method to MGSBreakpointDelegate for updating breakpoints in res…

…ponse to user edits.

MGSBreakpointDelegate.h

@@ -54,5 +54,16 @@
  *  @param line The one-based line number which the user clicked on. */
 - (void)toggleBreakpointForFragaria:(MGSFragariaView *)sender onLine:(NSUInteger)line;
 
+/** Tells the delegate that some lines were added or deleted from the text,
+ *  to allow fixing any breakpoints that lie on these lines.
+ *  @discussion Your implementation of this method should call
+ *              -reloadBreakpointData on sender if any line number had to be
+ *              fixed (it is not automatic).
+ *  @param newRange The affected range of one-based line numbers.
+ *  @param delta How many lines were added (if positive) or deleted (if
+ *               negative) during the edit.
+ *  @param sender The MGSFragaria instance which sent the message. */
+- (void)fixBreakpointsOfAddedLines:(NSInteger)delta inLineRange:(NSRange)newRange ofFragaria:(MGSFragariaView *)sender;
+
 
 @end

MGSLineNumberView.m

@@ -55,6 +55,7 @@ @implementation MGSLineNumberView
     NSSize _markerImagesSize;
 
     NSDictionary *_breakpointData;
+    NSUInteger _lastLineCount;
 }
 
 
@@ -167,6 +168,7 @@ - (void)layoutManagerWillChangeTextStorage
 - (void)layoutManagerDidChangeTextStorage
 {
     NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
+    _lastLineCount = self.clientView.textStorage.mgs_lineCount;
     [nc addObserver:self selector:@selector(textStorageDidProcessEditing:)
       name:NSTextStorageDidProcessEditingNotification object:self.clientView.textStorage];
 }
@@ -202,6 +204,33 @@ - (void)setBreakpointDelegate:(id<MGSBreakpointDelegate>)breakpointDelegate
 
 - (void)textStorageDidProcessEditing:(NSNotification *)notification
 {
+    id <MGSBreakpointDelegate> bd;
+    NSTextStorage *ts;
+    NSRange ecr, elr;
+    NSInteger charDelta, lineDelta;
+
+    bd = self.breakpointDelegate;
+    if ([bd respondsToSelector:
+         @selector(fixBreakpointsOfAddedLines:inLineRange:ofFragaria:)]) {
+        ts = self.clientView.textStorage;
+        charDelta = ts.changeInLength;
+        if (charDelta && self.lineCount != _lastLineCount) {
+            lineDelta = self.lineCount - _lastLineCount;
+
+            ecr = ts.editedRange;
+            elr.location = [ts mgs_rowOfCharacter:ecr.location];
+            if (ecr.length)
+                elr.length = [ts mgs_rowOfCharacter:NSMaxRange(ecr)] - elr.location;
+            else
+                elr.length = 0;
+            elr.location++;
+            elr.length++;
+
+            [bd fixBreakpointsOfAddedLines:lineDelta inLineRange:elr ofFragaria:_fragaria];
+        }
+    }
+    _lastLineCount = self.lineCount;
+
     [self setNeedsDisplay:YES];
 }
 

NSTextStorage+Fragaria.m

@@ -77,9 +77,7 @@ - (void)textStorageWillProcessEditing:(NSNotification *)notification
             lastEditedRange = ts.editedRange;
             lastChangeInLength = ts.changeInLength;
         } else {
-            /* Merging edited ranges is difficult, so we give up. Also, it is
-             * unreliable because I saw this notification fire twice for
-             * the same edit. */
+            /* Merging edited ranges is difficult, so we give up. */
             lineCountGuess = NSNotFound;
         }
     }