Make Cmd+A select all folders in the Folder Selection dialog (Cocoa)

Fixes #228.

cocoa/base/DirectoryOutline.h

@@ -16,4 +16,6 @@ http://www.hardcoded.net/licenses/bsd_license
 @interface DirectoryOutline : HSOutline {}
 - (id)initWithPyRef:(PyObject *)aPyRef outlineView:(HSOutlineView *)aOutlineView;
 - (PyDirectoryOutline *)model;
+
+- (void)selectAll;
 @end;

cocoa/base/DirectoryOutline.m

@@ -22,6 +22,12 @@ http://www.hardcoded.net/licenses/bsd_license
     return (PyDirectoryOutline *)model;
 }
 
+/* Public */
+- (void)selectAll
+{
+    [[self model] selectAll];
+}
+
 /* Delegate */
 - (NSDragOperation)outlineView:(NSOutlineView *)outlineView validateDrop:(id < NSDraggingInfo >)info proposedItem:(id)item proposedChildIndex:(NSInteger)index
 {

cocoa/base/DirectoryPanel.h

@@ -46,4 +46,6 @@ http://www.hardcoded.net/licenses/bsd_license
 
 - (void)addDirectory:(NSString *)directory;
 - (void)refreshRemoveButtonText;
+- (void)markAll;
+
 @end

cocoa/base/DirectoryPanel.m

@@ -158,6 +158,14 @@ http://www.hardcoded.net/licenses/bsd_license
     }
 }
 
+- (void)markAll
+{
+    /* markAll isn't very descriptive of what we do, but since we re-use the Mark All button from
+       the result window, we don't have much choice.
+    */
+    [outline selectAll];
+}
+
 /* Delegate */
 - (BOOL)panel:(id)sender shouldShowFilename:(NSString *)path
 {
@@ -171,6 +179,14 @@ http://www.hardcoded.net/licenses/bsd_license
     [self addDirectory:path];
 }
 
+- (BOOL)validateMenuItem:(NSMenuItem *)item
+{
+    if ([item action] == @selector(markAll)) {
+        [item setTitle:NSLocalizedString(@"Select All", @"")];
+    }
+    return YES;
+}
+
 /* Notifications */
 
 - (void)directorySelectionChanged:(NSNotification *)aNotification

cocoa/base/ResultWindowBase.m

@@ -344,6 +344,9 @@ http://www.hardcoded.net/licenses/bsd_license
 
 - (BOOL)validateMenuItem:(NSMenuItem *)item
 {
+    if ([item action] == @selector(markAll)) {
+        [item setTitle:NSLocalizedString(@"Mark All", @"")];
+    }
     return ![[ProgressController mainProgressController] isShown];
 }
 @end