Convince Xcode 9 not to smooth its source code font

xcode.sh

#!/bin/bash

# Exit the script immediately on error
set -e

# We'll work in /tmp
cd /tmp

# Clone mach_override unless we already have it
if [ ! -d mach_override ]; then
    git clone https://github.com/rentzsch/mach_override
fi


# ============================
# Compile the override library
# ============================
clang -dynamiclib -framework Cocoa -x objective-c -o monacoize.dylib -I. mach_override/mach_override.c mach_override/libudis86/*.c /dev/stdin <<"SOURCE"

    #import <Cocoa/Cocoa.h>
    #import <dlfcn.h>
    #import <objc/runtime.h>
    #import "mach_override/mach_override.h"
    
    // SourceEditor.SourceEditorLineLayer.init(attributedString: __ObjC.NSAttributedString, referencedLine: SourceEditor.SourceEditorLineIdentifier, lineLayoutManager: SourceEditor.LineLayoutManager, fontSmoothingAttributes: SourceEditor.SourceEditorFontSmoothingAttributes, textRenderingColorSpace: Swift.Optional<__ObjC.CGColorSpace>, images: Swift.Array<(image: __ObjC.CGImage, columnRange: Swift.Range<Swift.Int>)>) -> SourceEditor.SourceEditorLineLayer
    
    #define ARGS void *a, void *b, void *c, void *d, unsigned *fontSmoothingAttributes, void *e, void *f
    void *(*originalLineLayerInit)(ARGS);
    
    void *replacementLineLayerInit(ARGS) {
        *fontSmoothingAttributes = 0;
        return originalLineLayerInit(a, b, c, d, fontSmoothingAttributes, e, f);
    }
    
    CTTypesetterRef (*originalCTTypesetterCreateWithAttributedString)(CFAttributedStringRef string);
    
    CTTypesetterRef replacementCTTypesetterCreateWithAttributedString(CFAttributedStringRef string) {
        CFMutableAttributedStringRef mutable = CFAttributedStringCreateMutableCopy(NULL, 0, string);
        CFRange range = CFRangeMake(0, CFAttributedStringGetLength(mutable));
        CFAttributedStringSetAttribute(mutable, range, kCTKernAttributeName, (void *)@0.75);
        CTTypesetterRef result = originalCTTypesetterCreateWithAttributedString(mutable);
        CFRelease(mutable);
        return result;
    }
    
    void LoadMonacoize(void *lineLayerInit) {
        fprintf(stderr, "lineLayerInit = %p\n", lineLayerInit);
        mach_error_t result = mach_override_ptr(lineLayerInit, replacementLineLayerInit, (void **)&originalLineLayerInit);
        if(result != 0) {
            fprintf(stderr, "ERROR %d TRYING TO OVERRIDE LayerInit\n", result);
        }
        
        result = mach_override_ptr(CTTypesetterCreateWithAttributedString, replacementCTTypesetterCreateWithAttributedString, (void **)&originalCTTypesetterCreateWithAttributedString);
        if(result != 0) {
            fprintf(stderr, "ERROR %d TRYING TO OVERRIDE CTTypesetter\n", result);
        }
    }

SOURCE
# =======================
# End of override library
# =======================


# =================================================
# Run Xcode in lldb and invoke the override library
# =================================================
lldb /Applications/Xcode.app -s <(cat <<"COMMANDS"

b SourceEditor.SourceEditorLayoutManager.makeLineLayerForLine
break command add
    expr (void *)dlopen("/tmp/monacoize.dylib", 0x8)
    expr void *$fptr = (void *)(void (*)(void))_T012SourceEditor0aB9LineLayerCACSo18NSAttributedStringC010attributedF0_AA0abC10IdentifierV010referencedC0AA0C13LayoutManager_p04linejK0AA0aB23FontSmoothingAttributesV04fontnO0So12CGColorSpaceCSg018textRenderingColorR0SaySo7CGImageC5image_s5RangeVySiG06columnX0tG6imagestcfc
    expr (void)LoadMonacoize($fptr)
    br del 1
    cont
DONE
run

cont

exit

COMMANDS
)
# ======================
# End of lldb invocation
# ======================