revenge-tweak/Sources/Fonts.x

#import "Fonts.h"
#import "Utils.h"
#import "Logger.h"
#import <CoreText/CoreText.h>
#import <CoreGraphics/CoreGraphics.h>
#import <CoreFoundation/CoreFoundation.h>

NSMutableDictionary<NSString *, NSString *> *fontMap;

%hook UIFont

+ (UIFont *)fontWithName:(NSString *)name size:(CGFloat)size {
    NSString *replacementName = fontMap[name];
    if (replacementName) {
        UIFontDescriptor *replacementDescriptor = [UIFontDescriptor fontDescriptorWithName:replacementName size:size];
        UIFontDescriptor *fallbackDescriptor = [replacementDescriptor fontDescriptorByAddingAttributes:@{UIFontDescriptorNameAttribute: @[name]}];
        UIFontDescriptor *finalDescriptor = [replacementDescriptor fontDescriptorByAddingAttributes:@{UIFontDescriptorCascadeListAttribute: @[fallbackDescriptor]}];

        return [UIFont fontWithDescriptor:finalDescriptor size:size];
    }
    return %orig;
}

+ (UIFont *)fontWithDescriptor:(UIFontDescriptor *)descriptor size:(CGFloat)size {
    NSString *replacementName = fontMap[descriptor.postscriptName];
    if (replacementName) {
        UIFontDescriptor *replacementDescriptor = [UIFontDescriptor fontDescriptorWithName:replacementName size:size];
        UIFontDescriptor *finalDescriptor = [replacementDescriptor fontDescriptorByAddingAttributes:@{UIFontDescriptorCascadeListAttribute: @[descriptor]}];

        return [UIFont fontWithDescriptor:finalDescriptor size:size];
    }
    return %orig;
}

+ (UIFont *)systemFontOfSize:(CGFloat)size {
    NSString *replacementName = fontMap[@"systemFont"];
    if (replacementName) {
        return [UIFont fontWithName:replacementName size:size];
    }
    return %orig;
}

+ (UIFont *)preferredFontForTextStyle:(UIFontTextStyle)style {
    NSString *replacementName = fontMap[@"systemFont"];
    if (replacementName) {
        return [UIFont fontWithName:replacementName size:[UIFont systemFontSize]];
    }
    return %orig;
}

%end

void patchFonts(NSDictionary<NSString *, NSString *> *mainFonts, NSString *fontDefName) {
    RevengeLog(@"patchFonts called with fonts: %@ and def name: %@", mainFonts, fontDefName);

    if (!fontMap) {
        RevengeLog(@"Creating new fontMap");
        fontMap = [NSMutableDictionary dictionary];
    }

    NSString *fontJson = [NSString stringWithContentsOfURL:[getPyoncordDirectory() URLByAppendingPathComponent:@"fonts.json"]
                                                 encoding:NSUTF8StringEncoding
                                                    error:nil];
    if (fontJson) {
        RevengeLog(@"Found existing fonts.json: %@", fontJson);
    }

    for (NSString *fontName in mainFonts) {
        NSString *url = mainFonts[fontName];
        RevengeLog(@"Replacing font %@ with URL: %@", fontName, url);

        NSURL *fontURL = [NSURL URLWithString:url];
        NSString *fontExtension = fontURL.pathExtension;

        NSURL *fontCachePath = [[[getPyoncordDirectory()
                                 URLByAppendingPathComponent:@"downloads" isDirectory:YES]
                                URLByAppendingPathComponent:@"fonts" isDirectory:YES]
                               URLByAppendingPathComponent:fontDefName isDirectory:YES];

        fontCachePath = [fontCachePath URLByAppendingPathComponent:[NSString stringWithFormat:@"%@.%@", fontName, fontExtension]];

        NSURL *parentDir = [fontCachePath URLByDeletingLastPathComponent];
        if (![[NSFileManager defaultManager] fileExistsAtPath:parentDir.path]) {
            RevengeLog(@"Creating parent directory: %@", parentDir.path);
            [[NSFileManager defaultManager] createDirectoryAtURL:parentDir
                                   withIntermediateDirectories:YES
                                                    attributes:nil
                                                         error:nil];
        }

        if (![[NSFileManager defaultManager] fileExistsAtPath:fontCachePath.path]) {
            RevengeLog(@"Downloading font %@ from %@", fontName, url);
            NSData *data = [NSData dataWithContentsOfURL:fontURL];
            if (data) {
                RevengeLog(@"Writing font data to: %@", fontCachePath.path);
                [data writeToURL:fontCachePath atomically:YES];
            }
        }

        NSData *fontData = [NSData dataWithContentsOfURL:fontCachePath];
        if (fontData) {
            RevengeLog(@"Registering font %@ with provider", fontName);
            CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)fontData);
            CGFontRef font = CGFontCreateWithDataProvider(provider);

            if (font) {
                CFStringRef postScriptName = CGFontCopyPostScriptName(font);

                CTFontRef existingFont = CTFontCreateWithName(postScriptName, 0, NULL);
                if (existingFont) {
                    CFErrorRef unregisterError = NULL;
                    if (!CTFontManagerUnregisterGraphicsFont(font, &unregisterError)) {
                        RevengeLog(@"Failed to deregister font %@: %@", (__bridge NSString *)postScriptName,
                               unregisterError ? (__bridge NSString *)CFErrorCopyDescription(unregisterError) : @"Unknown error");
                        if (unregisterError) CFRelease(unregisterError);
                    }
                    CFRelease(existingFont);
                }

                CFErrorRef error = NULL;
                if (CTFontManagerRegisterGraphicsFont(font, &error)) {
                    fontMap[fontName] = (__bridge NSString *)postScriptName;
                    RevengeLog(@"Successfully registered font %@ to %@", fontName, (__bridge NSString *)postScriptName);

                    NSError *jsonError;
                    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:fontMap options:0 error:&jsonError];
                    if (!jsonError) {
                        [jsonData writeToURL:[getPyoncordDirectory() URLByAppendingPathComponent:@"fontMap.json"] atomically:YES];
                    }
                } else {
                    NSString *errorDesc = error ? (__bridge NSString *)CFErrorCopyDescription(error) : @"Unknown error";
                    RevengeLog(@"Failed to register font %@: %@", fontName, errorDesc);
                    if (error) CFRelease(error);
                }

                CFRelease(postScriptName);
                CFRelease(font);
            }
            CGDataProviderRelease(provider);
        }
    }
}

%ctor {
    @autoreleasepool {
        fontMap = [NSMutableDictionary dictionary];
        RevengeLog(@"Font hooks initialized");
        %init;
    }
}