ctucx.git: nixfiles

pkgs: add XPCEEventHandler

diff --git a/pkgs/XPCEventStreamHandler/default.nix b/pkgs/XPCEventStreamHandler/default.nix
@@ -0,0 +1,27 @@
+{stdenv, runCommand, ...}:
+
+let
+  buildSymlinks = runCommand "macvim-build-symlinks" {} ''
+    mkdir -p $out/bin
+    ln -s /usr/bin/gcc $out/bin
+  '';
+
+in stdenv.mkDerivation {
+  name = "XPCEventStreamHandler";
+  src = ./.;
+
+  nativeBuildInputs = [ buildSymlinks ];
+
+  sandboxProfile = ''
+     (allow file-read* file-write* process-exec mach-lookup)
+     ; block homebrew dependencies
+     (deny file-read* file-write* process-exec mach-lookup (subpath "/usr/local") (with no-log))
+  '';
+
+  buildPhase = "gcc -framework Foundation -o xpc_set_event_stream_handler xpc_set_event_stream_handler.m";
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp xpc_set_event_stream_handler $out/bin/
+  '';
+}

diff --git a/pkgs/XPCEventStreamHandler/xpc_set_event_stream_handler.m b/pkgs/XPCEventStreamHandler/xpc_set_event_stream_handler.m
@@ -0,0 +1,25 @@
+//
+//  main.m
+//  xpc_set_event_stream_handler
+//
+//  Created by Ford Parsons on 10/23/17.
+//  Copyright © 2017 Ford Parsons. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#include <xpc/xpc.h>
+
+int main(int argc, const char * argv[]) {
+    @autoreleasepool {
+        dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
+        xpc_set_event_stream_handler("com.apple.iokit.matching", NULL, ^(xpc_object_t _Nonnull object) {
+            const char *event = xpc_dictionary_get_string(object, XPC_EVENT_KEY_NAME);
+            NSLog(@"%s", event);
+            dispatch_semaphore_signal(semaphore);
+        });
+        dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
+        if(argc >= 2) {
+            execv(argv[1], (char **)argv+1);
+        }
+    }
+}