From ee7e780efde86970e68e6ab4af6aa1b11d4ac88b Mon Sep 17 00:00:00 2001
From: Teddy Wing
Date: Sun, 7 Mar 2021 01:44:50 +0100
Subject: Register a global hotkey

Build DDHotKey as a static library so we can compile it with ARC turned
on and our project with ARC turned off. Since DDHotKey is written with
ARC, if I include its headers directly, I'd need to enable ARC on my
project in order to compile it.

Initialise an `NSApplication` to give us an environment in which to
register the global hotkey.

A new class `Invert` will respond to the hotkey and respond accordingly.
---
 .gitignore |  1 +
 Invert.h   |  7 +++++++
 Invert.m   | 10 ++++++++++
 Makefile   | 44 ++++++++++++++++++++++++++++++++++++++++++--
 main.m     | 30 ++++++++++++++++++++++++++++--
 5 files changed, 88 insertions(+), 4 deletions(-)
 create mode 100644 .gitignore
 create mode 100644 Invert.h
 create mode 100644 Invert.m

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..84c048a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/build/
diff --git a/Invert.h b/Invert.h
new file mode 100644
index 0000000..c84685e
--- /dev/null
+++ b/Invert.h
@@ -0,0 +1,7 @@
+#import <Cocoa/Cocoa.h>
+
+@interface Invert : NSObject
+
+- (void)toggleInvertColors:(NSEvent *)event;
+
+@end
diff --git a/Invert.m b/Invert.m
new file mode 100644
index 0000000..a41eb46
--- /dev/null
+++ b/Invert.m
@@ -0,0 +1,10 @@
+#import "Invert.h"
+
+@implementation Invert
+
+- (void)toggleInvertColors:(NSEvent *)event
+{
+    NSLog(@"Toggling");
+}
+
+@end
diff --git a/Makefile b/Makefile
index ef9d048..5baa173 100644
--- a/Makefile
+++ b/Makefile
@@ -1,2 +1,42 @@
-all:
-	clang -x objective-c -framework CoreGraphics -o invert-catalina-invert main.m
+# SOURCES := $(shell find . -not -path './lib/*' -and \( -name '*.h' -or -name '*.m' \))
+SOURCES := $(shell ls *.{h,m})
+
+DDHOTKEY_OBJ := $(patsubst %.m,%.o,$(wildcard lib/DDHotKey/*.m))
+
+
+all: $(SOURCES) build/libddhotkey.a build/include/*.h
+	clang -x objective-c \
+		-framework Carbon \
+		-framework Cocoa \
+		-framework CoreGraphics \
+		-framework Foundation \
+		-fno-objc-arc \
+		-I./build/include \
+		-L./build \
+		-lddhotkey \
+		-o invert-catalina-invert \
+		$(SOURCES)
+
+build/include/*.h: lib/DDHotKey/*.h
+	cp $^ build/include/
+
+# build/libddhotkey.o: lib/DDHotKey/*.h lib/DDHotKey/*.m
+lib/DDHotKey/%.o: lib/DDHotKey/%.m
+	clang -x objective-c \
+		-w \
+		-framework Carbon \
+		-framework Cocoa \
+		-framework Foundation \
+		-fobjc-arc \
+		-c \
+		$^
+
+	mv *.o lib/DDHotKey/
+
+lib/DDHotKey/*.o: lib/DDHotKey/*.m
+
+build/libddhotkey.a: $(DDHOTKEY_OBJ)
+# build/libddhotkey.a: lib/DDHotKey/*.o
+	libtool -static \
+		-o $@ \
+		$^
diff --git a/main.m b/main.m
index 9ea3d37..8ffc3b2 100644
--- a/main.m
+++ b/main.m
@@ -1,8 +1,28 @@
+#import <Carbon/Carbon.h>
 #import <CoreGraphics/CoreGraphics.h>
 
+#import "Invert.h"
+#import "DDHotKeyCenter.h"
+
 #define MAX_DISPLAYS 8
 
 int main(int argc, const char * argv[]) {
+    [NSApplication sharedApplication];
+
+    Invert *invert = [[Invert alloc] init];
+
+    DDHotKeyCenter *c = [DDHotKeyCenter sharedHotKeyCenter];
+    if (
+        ![c registerHotKeyWithKeyCode:kVK_ANSI_8
+            modifierFlags:
+                (NSEventModifierFlagControl | NSEventModifierFlagOption | NSEventModifierFlagCommand)
+            target:invert
+            action:@selector(toggleInvertColors:)
+            object:nil]
+    ) {
+        NSLog(@"Error registering hotkey");
+    }
+
     const CGGammaValue inverted_gamma[2] = {1, 0};
 
     CGDirectDisplayID active_displays[MAX_DISPLAYS];
@@ -30,9 +50,15 @@ int main(int argc, const char * argv[]) {
         }
     }
 
-    sleep(4);
+    // for (;;) {}
+    // sleep(4);
+    //
+    // CGDisplayRestoreColorSyncSettings();
+
+    // TODO: trap?
+    // [invert release];
 
-    CGDisplayRestoreColorSyncSettings();
+    [NSApp run];
 
     return 0;
 }
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