Proof-of-concept for fmt conversion

- Check check for fmt like format
- Introduce fmt conversion with fallback option to default format

Author: wutschel

Kodi Remote.xcodeproj/project.pbxproj

@@ -100,6 +100,7 @@
 		C76594B52C5E883A00B93A2A /* Localizable.strings in Resources */ = {isa = PBXBuildFile; fileRef = 1A9786C21683D87800B4F3F8 /* Localizable.strings */; };
 		C76594B62C5E885B00B93A2A /* Roboto-Regular.ttf in Resources */ = {isa = PBXBuildFile; fileRef = 0FE6087E164B3094009CA3A9 /* Roboto-Regular.ttf */; };
 		C76594B72C5E8A5B00B93A2A /* PrivacyInfo.xcprivacy in Resources */ = {isa = PBXBuildFile; fileRef = C70F41D02BA4D98E00847C75 /* PrivacyInfo.xcprivacy */; };
+		C771C7292EC7879300581D44 /* fmt_convert.mm in Sources */ = {isa = PBXBuildFile; fileRef = C771C7282EC7879300581D44 /* fmt_convert.mm */; };
 		C78C30F528F877870055CD95 /* VersionCheck.m in Sources */ = {isa = PBXBuildFile; fileRef = C78C30F428F877870055CD95 /* VersionCheck.m */; };
 		C78C30FA28F8AADA0055CD95 /* SharingActivityItemSource.m in Sources */ = {isa = PBXBuildFile; fileRef = C78C30F928F89A3E0055CD95 /* SharingActivityItemSource.m */; };
 		C795123F2DC95A7E00A8CEE5 /* LinkPresentation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = C795123E2DC95A7E00A8CEE5 /* LinkPresentation.framework */; settings = {ATTRIBUTES = (Weak, ); }; };
@@ -326,6 +327,8 @@
 		C76451CB29C51221000AE949 /* UIButton+WebCache.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = "UIButton+WebCache.m"; path = "SDWebImage/UIButton+WebCache.m"; sourceTree = "<group>"; };
 		C76451CC29C51221000AE949 /* SDWebImageManager.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = SDWebImageManager.h; path = SDWebImage/SDWebImageManager.h; sourceTree = "<group>"; };
 		C76451CD29C51221000AE949 /* UIImage+MultiFormat.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = "UIImage+MultiFormat.m"; path = "SDWebImage/UIImage+MultiFormat.m"; sourceTree = "<group>"; };
+		C771C7282EC7879300581D44 /* fmt_convert.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; path = fmt_convert.mm; sourceTree = "<group>"; };
+		C771C72A2EC787B500581D44 /* fmt_convert.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = fmt_convert.h; sourceTree = "<group>"; };
 		C772AD2A2E675D8300435181 /* bs-BA */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = "bs-BA"; path = "bs-BA.lproj/InfoPlist.strings"; sourceTree = "<group>"; };
 		C772AD2B2E675D8300435181 /* bs-BA */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = "bs-BA"; path = "bs-BA.lproj/Localizable.strings"; sourceTree = "<group>"; };
 		C78204462E3930FC00B3F1E9 /* uk-UA */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = "uk-UA"; path = "uk-UA.lproj/InfoPlist.strings"; sourceTree = "<group>"; };
@@ -588,6 +591,8 @@
 				0F4019B218F415A50064E4DC /* MessagesView.m */,
 				0F4AB8181903DDCE005DEC5C /* RemoteControllerGestureZoneView.h */,
 				0F4AB8191903DDCE005DEC5C /* RemoteControllerGestureZoneView.m */,
+				C771C72A2EC787B500581D44 /* fmt_convert.h */,
+				C771C7282EC7879300581D44 /* fmt_convert.mm */,
 				0F747736151DD98600EF78AD /* classes */,
 				0F554901151D1187007E633F /* Supporting Files */,
 				0F554C21151D197F007E633F /* nib */,
@@ -936,6 +941,7 @@
 				C76451CF29C51221000AE949 /* UIImage+WebP.m in Sources */,
 				0F7F3DA5164A6D730080A14A /* ECSlidingViewController.m in Sources */,
 				C7B7D03A2F76D36E00689B5A /* UILabel+Extensions.m in Sources */,
+				C771C7292EC7879300581D44 /* fmt_convert.mm in Sources */,
 				C79B0EA52DF0CF6900046334 /* BaseMasterViewController.m in Sources */,
 				0F7F3DA6164A6D730080A14A /* UIImage+ImageWithUIView.m in Sources */,
 				0F7F3DAB164AAD0F0080A14A /* InitialSlidingViewController.m in Sources */,

XBMC Remote/SettingsValuesViewController.m

@@ -15,6 +15,7 @@
 #import "StackScrollViewController.h"
 #import "Utilities.h"
 #import "UIBarButtonItem+Extensions.h"
+#import "fmt_convert.h"
 
 #define SETTINGS_CELL_LABEL 1
 #define SETTINGS_CELL_DESCRIPTION 2
@@ -371,43 +372,37 @@ - (void)setSettingValue:(id)value sender:(id)sender {
 
 #pragma mark - Helper
 
-- (NSString*)getFormatString:(NSString*)format {
-    // Default format does not provide any units
-    NSString *defaultFormat = settingValueType == SettingValueTypeNumber ? @"%.2f" : @"%i";
-    
-    // Identify fmt-like format string
+- (BOOL)fmtLikeFormat:(NSString*)format {
     NSInteger openBraceLoc = [format rangeOfString:@"{"].location;
     NSInteger closeBraceLoc = [format rangeOfString:@"}" options:NSBackwardsSearch].location;
     if (format.length && openBraceLoc != NSNotFound && closeBraceLoc != NSNotFound && openBraceLoc < closeBraceLoc) {
-        // Gather range for unit which is added after last "}"
-        NSRange range;
-        range.location = closeBraceLoc + 1;
-        range.length = format.length - range.location;
-        
-        // Extract unit and make percent character is formatted correctly
-        NSString *unit = [format substringWithRange:range];
-        unit = [unit stringByReplacingOccurrencesOfString:@"%" withString:@"%%"];
-        
-        // Build std format string, appending the fmt format string's unit
-        format = [defaultFormat stringByAppendingString:unit];
-    }
-    // Fallback to default in case no format is defined or we missed to identify fmt-style format (which is used for Kodi 18 and later)
-    else if (!format.length || AppDelegate.instance.serverVersion >= 18) {
-        format = defaultFormat;
+        return YES;
     }
-    return format;
+    return NO;
 }
 
 - (NSString*)getStringForSliderItem:(id)item value:(float)value {
-    NSString *format = [self getFormatString:item[@"formatlabel"]];
+    NSString *defaultFormat = settingValueType == SettingValueTypeNumber ? @"%.2f" : @"%i";
+    NSString *format = item[@"formatlabel"] ?: defaultFormat;
+    BOOL fmtLike = [self fmtLikeFormat:format];
     NSString *stringResult;
     switch (settingValueType) {
         case SettingValueTypeNumber:
-            stringResult = [NSString stringWithFormat:format, value];
+            if (fmtLike) {
+                stringResult = [NSString fmtFormatted:format defaultFormat:defaultFormat floatValue:value];
+            }
+            else {
+                stringResult = [NSString stringWithFormat:format, value];
+            }
             break;
         case SettingValueTypeInteger:
         default:
-            stringResult = [NSString stringWithFormat:format, (int)value];
+            if (fmtLike) {
+                stringResult = [NSString fmtFormatted:format defaultFormat:defaultFormat intValue:(int)value];
+            }
+            else {
+                stringResult = [NSString stringWithFormat:format, (int)value];
+            }
             break;
     }
     return stringResult;

XBMC Remote/fmt_convert.h

@@ -0,0 +1,15 @@
+//
+//  fmt_convert.h
+//  Kodi Remote
+//
+//  Created by Buschmann on 14.11.25.
+//  Copyright © 2025 Team Kodi. All rights reserved.
+//
+
+@interface NSString (fmt)
+
++ (NSString*)fmtFormatted:(NSString*)format defaultFormat:(NSString*)defaultFormat intValue:(int)value;
++ (NSString*)fmtFormatted:(NSString*)format defaultFormat:(NSString*)defaultFormat floatValue:(float)value;
+
+@end
+

XBMC Remote/fmt_convert.mm

@@ -0,0 +1,40 @@
+//
+//  fmt_convert.m
+//  Kodi Remote
+//
+//  Created by Buschmann on 14.11.25.
+//  Copyright © 2025 Team Kodi. All rights reserved.
+//
+
+#import "fmt_convert.h"
+
+#include <fmt/core.h>
+#include <string>
+
+@implementation NSString (fmt)
+
++ (NSString*)fmtFormatted:(NSString*)format defaultFormat:(NSString*)defaultFormat intValue:(int)value {
+    try {
+        const std::string formatted = fmt::format(format.UTF8String, value);
+        // not sure if `length` param should be +1 to account for the terminating 0-character
+        return [[NSString alloc] initWithBytes:formatted.data() length:formatted.size() encoding:NSUTF8StringEncoding];
+    }
+    catch (const std::exception &exc) {
+        NSLog(@"generic format error: %s", exc.what());
+    }
+    return [NSString stringWithFormat:defaultFormat, value];
+}
+
++ (NSString*)fmtFormatted:(NSString*)format defaultFormat:(NSString*)defaultFormat floatValue:(float)value {
+    try {
+        const std::string formatted = fmt::format(format.UTF8String, value);
+        // not sure if `length` param should be +1 to account for the terminating 0-character
+        return [[NSString alloc] initWithBytes:formatted.data() length:formatted.size() encoding:NSUTF8StringEncoding];
+    }
+    catch (const std::exception &exc) {
+        NSLog(@"generic format error: %s", exc.what());
+    }
+    return [NSString stringWithFormat:defaultFormat, value];
+}
+
+@end