Added reverse text search to the Cocoa console

Cocoa/GBTerminalTextFieldCell.m

@@ -25,6 +25,7 @@
 {
     NSMutableOrderedSet *lines;
     NSUInteger current_line;
+    bool reverse_search_mode;
 }
 
 - (instancetype)init
@@ -39,15 +40,23 @@
 
 - (void)moveUp:(id)sender
 {
+    reverse_search_mode = false;
     if (current_line != 0) {
         current_line--;
         [self setString:[lines objectAtIndex:current_line]];
     }
+    else {
+        [self setSelectedRange:NSMakeRange(0, 0)];
+        NSBeep();
+    }
 }
 
 - (void)moveDown:(id)sender
 {
+    reverse_search_mode = false;
     if (current_line == [lines count]) {
+        [self setString:@""];
+        NSBeep();
         return;
     }
     current_line++;
@@ -59,7 +68,7 @@
     }
 }
 
--(void) insertNewline:(id)sender
+-(void)insertNewline:(id)sender
 {
     if ([self.string length]) {
         NSString *string = [self.string copy];
@@ -68,6 +77,116 @@
     }
     [super insertNewline:sender];
     current_line = [lines count];
+    reverse_search_mode = false;
 }
 
+- (void)keyDown:(NSEvent *)event
+{
+    if (event.keyCode == kVK_ANSI_R && (event.modifierFlags & NSEventModifierFlagDeviceIndependentFlagsMask) == NSEventModifierFlagControl) {
+        if ([lines count] == 0) {
+            NSBeep();
+            return;
+        }
+        if (!reverse_search_mode) {
+            [self selectAll:self];
+            current_line = [lines count] - 1;
+        }
+        else {
+            if (current_line != 0) {
+                current_line--;
+            }
+            else {
+                NSBeep();
+            }
+        }
+        
+        if (self.string.length) {
+            [self updateReverseSearch];
+        }
+        else {
+            [self setNeedsDisplay:YES];
+            reverse_search_mode = true;
+        }
+
+    }
+    else {
+        [super keyDown:event];
+    }
+}
+
+- (void) updateReverseSearch
+{
+    NSUInteger old_line = current_line;
+    reverse_search_mode = false;
+    NSString *substring = [self.string substringWithRange:self.selectedRange];
+    do {
+        NSString *line = [lines objectAtIndex:current_line];
+        NSRange range = [line rangeOfString:substring];
+        if (range.location != NSNotFound) {
+            self.string = line;
+            [self setSelectedRange:range];
+            reverse_search_mode = true;
+            return;
+        }
+    } while (current_line--);
+    current_line = old_line;
+    reverse_search_mode = true;
+    NSBeep();
+}
+
+- (void) insertText:(NSString *)string replacementRange:(NSRange)range
+{
+    if (reverse_search_mode) {
+        range = self.selectedRange;
+        self.string = [[self.string substringWithRange:range] stringByAppendingString:string];
+        [self selectAll:nil];
+        [self updateReverseSearch];
+    }
+    else {
+        [super insertText:string replacementRange:range];
+    }
+}
+
+-(void)deleteBackward:(id)sender
+{
+    if (reverse_search_mode && self.string.length) {
+        NSRange range = self.selectedRange;
+        range.length--;
+        self.string = [self.string substringWithRange:range];
+        if (range.length) {
+            [self selectAll:nil];
+            [self updateReverseSearch];
+        }
+        else {
+            reverse_search_mode = true;
+            current_line = [lines count] - 1;
+        }
+    }
+    else {
+        [super deleteBackward:sender];
+    }
+}
+
+-(void)setSelectedRanges:(NSArray<NSValue *> *)ranges affinity:(NSSelectionAffinity)affinity stillSelecting:(BOOL)stillSelectingFlag
+{
+    reverse_search_mode = false;
+    [super setSelectedRanges:ranges affinity:affinity stillSelecting:stillSelectingFlag];
+}
+
+- (BOOL)resignFirstResponder {
+    reverse_search_mode = false;
+    return [super resignFirstResponder];
+}
+
+-(void)drawRect:(NSRect)dirtyRect
+{
+    [super drawRect:dirtyRect];
+    if (reverse_search_mode && [super string].length == 0) {
+        NSMutableDictionary *attributes = [self.typingAttributes mutableCopy];
+        NSColor *color = [attributes[NSForegroundColorAttributeName] colorWithAlphaComponent:0.5];
+        [attributes setObject:color forKey:NSForegroundColorAttributeName];
+        [[[NSAttributedString alloc] initWithString:@"Reverse search..." attributes:attributes] drawAtPoint:NSMakePoint(2, 0)];
+    }
+
+}
 @end