feat: uint formatter with units

baRSS/Helper/StrictUIntFormatter.h

@@ -1,4 +1,6 @@
 @import Cocoa;
 
 @interface StrictUIntFormatter : NSFormatter
+/// Note: must contain `%ld` and is used as formatter string.
+@property (nullable, copy) NSString *unit;
 @end

baRSS/Helper/StrictUIntFormatter.m

@@ -3,11 +3,28 @@
 @implementation StrictUIntFormatter
 /// Display object as integer formatted string.
 - (NSString *)stringForObjectValue:(id)obj {
-	return [NSString stringWithFormat:@"%d", [[NSString stringWithFormat:@"%@", obj] intValue]];
+	NSString *str = [NSString stringWithFormat:@"%@", obj];
+	if (str.length == 0)
+		return @"";
+	if (self.unit)
+		return [NSString stringWithFormat:self.unit, [str integerValue]];
+	return [NSString stringWithFormat:@"%ld", [str integerValue]];
 }
+
+- (NSString *)editingStringForObjectValue:(id)obj {
+	NSString *str = [NSString stringWithFormat:@"%@", obj];
+	if (str.length == 0)
+		return @"";
+	return [NSString stringWithFormat:@"%ld", [str integerValue]];
+}
+
 /// Parse any pasted input as integer.
 - (BOOL)getObjectValue:(out id  _Nullable __autoreleasing *)obj forString:(NSString *)string errorDescription:(out NSString *__autoreleasing  _Nullable *)error {
+	if (string.length == 0) {
+		*obj = @"";
+	} else {
 		*obj = [[NSNumber numberWithInt:[string intValue]] stringValue];
+	}
 	return YES;
 }
 /// Only digits, no other character allowed

baRSS/NSCategories/NSView+Ext.h

@@ -36,7 +36,7 @@ static inline CGFloat NSMaxWidth(NSView *a, NSView *b) { return Max(NSWidth(a.fr
 // UI: TextFields
 + (NSTextField*)label:(NSString*)text;
 + (NSTextField*)inputField:(NSString*)placeholder width:(CGFloat)w;
-+ (NSTextField*)integerField:(NSUInteger)placeholder width:(CGFloat)w;
++ (NSTextField*)integerField:(NSString*)placeholder unit:(nullable NSString*)unit width:(CGFloat)w;
 + (NSView*)labelColumn:(NSArray<NSString*>*)labels rowHeight:(CGFloat)h padding:(CGFloat)pad;
 // UI: Buttons
 + (NSButton*)button:(NSString*)text;

baRSS/NSCategories/NSView+Ext.m

@@ -29,9 +29,11 @@
 }
 
 /// Create input text field which only accepts integer values. (calls `inputField`) `21px` height.
-+ (NSTextField*)integerField:(NSUInteger)placeholder width:(CGFloat)w {
-	NSTextField *input = [self inputField:[NSString stringWithFormat:@"%ld", placeholder] width:w];
+/// `field.formatter` is of type `StrictUIntFormatter`.
++ (NSTextField*)integerField:(NSString*)placeholder unit:(nullable NSString*)unit width:(CGFloat)w {
+	NSTextField *input = [self inputField:placeholder width:w];
 	input.formatter = [StrictUIntFormatter new];
+	((StrictUIntFormatter*)input.formatter).unit = unit;
 	return input;
 }
 

baRSS/Preferences/Feeds Tab/ModalFeedEditView.m

@@ -32,7 +32,7 @@
 	self.name = [[[NSView inputField:NSLocalizedString(@"Example Title", nil) width:0] placeIn:self x:x yTop:rowHeight] sizeToRight:PAD_S + 18];
 	self.spinnerName = [[NSView activitySpinner] placeIn:self xRight:1 yTop:rowHeight + 2.5];
 	// 3. row
-	self.refreshNum = [[NSView integerField:30 width:85] placeIn:self x:x yTop:2*rowHeight];
+	self.refreshNum = [[NSView integerField:@"∞" unit:nil width:85] placeIn:self x:x yTop:2*rowHeight];
 	self.refreshUnit = [[NSView popupButton:120] placeIn:self x:NSMaxX(self.refreshNum.frame) + PAD_M yTop:2*rowHeight];
 	self.regexConverterButton = [[[[NSView buttonIcon:RSSImageRegexIcon size:19]
 								   action:@selector(openRegexConverter) target:controller]