feat: add dark mode (#21)

* feat: add dark mode

* add docs

README.org

@@ -1,5 +1,5 @@
 #+DATE: 2023-10-21T12:09:48+0800
-#+LASTMOD: 2023-10-22T22:40:34+0800
+#+LASTMOD: 2023-11-09T22:26:31+0800
 #+TYPE: docs
 
 * Zigcli
@@ -21,9 +21,10 @@ This package provides:
   - =loc=, lines of code.
   - =tree=, list contents of directories in a tree-like format.
   - =yes=, output a string repeatedly until killed.
-  - =pidof=, like [[https://man7.org/linux/man-pages/man1/pidof.1.html][pidof]], but for macOS.
-  - =night-shift=, control [[https://support.apple.com/guide/mac-help/use-night-shift-mchl97bc676d/mac][Night Shift]] in cli, build for macOS.
   - =repeat=, repeat a command until it succeeds.
+  - =pidof=, like [[https://man7.org/linux/man-pages/man1/pidof.1.html][pidof]], but for macOS.
+  - =night-shift=, control [[https://support.apple.com/guide/mac-help/use-night-shift-mchl97bc676d/mac][Night Shift]] in macOS.
+  - =dark-mode=, Get dark mode status in macOS.
 
 * Install
 ** Programs

build.zig

@@ -104,6 +104,7 @@ fn buildBinaries(
         "pidof",
         "yes",
         "night-shift",
+        "dark-mode",
         "repeat",
     }) |name| {
         try buildBinary(b, .{ .bin = name }, optimize, target, is_ci, all_tests);
@@ -168,7 +169,7 @@ fn makeCompileStep(
 ) ?*Build.CompileStep {
     const name = comptime source.name();
     const path = comptime source.path();
-    if (std.mem.eql(u8, name, "night-shift") or std.mem.eql(u8, name, "pidof")) {
+    if (std.mem.eql(u8, name, "night-shift") or std.mem.eql(u8, name, "dark-mode") or std.mem.eql(u8, name, "pidof")) {
         if (target.getOsTag() != .macos) {
             return null;
         }
@@ -196,6 +197,9 @@ fn makeCompileStep(
         exe.linkSystemLibrary("objc");
         exe.addFrameworkPath(.{ .path = "/System/Library/PrivateFrameworks" });
         exe.linkFramework("CoreBrightness");
+    } else if (std.mem.eql(u8, name, "dark-mode")) {
+        exe.linkSystemLibrary("objc");
+        exe.linkFramework("AppKit");
     }
     return exe;
 }

docs/content/docs/programs/dark-mode.org

@@ -0,0 +1,2 @@
+* Dark mode
+Get dark mode status for macOS.

src/bin/dark-mode.zig

@@ -0,0 +1,31 @@
+//! Dark mode status, built for macOS.
+//!
+const std = @import("std");
+const c = @cImport({
+    @cInclude("objc/objc.h");
+    @cInclude("objc/message.h");
+});
+
+// https://developer.apple.com/documentation/appkit/nsappearancenamedarkaqua
+const darkValue = "NSAppearanceNameDarkAqua";
+
+pub fn main() !void {
+    const clazz = c.objc_getClass("NSAppearance");
+
+    const appearanceName = blk: {
+        const call: *fn (c.id, c.SEL) callconv(.C) c.id = @constCast(@ptrCast(&c.objc_msgSend));
+        const appearance = call(@alignCast(@ptrCast(clazz.?)), c.sel_registerName("currentDrawingAppearance"));
+        break :blk call(appearance, c.sel_registerName("name"));
+    };
+
+    const appearanceValue = blk: {
+        const call: *fn (c.id, c.SEL) callconv(.C) [*c]const u8 = @constCast(@ptrCast(&c.objc_msgSend));
+        break :blk call(appearanceName, c.sel_registerName("UTF8String"));
+    };
+
+    if (std.mem.eql(u8, darkValue, std.mem.span(appearanceValue.?))) {
+        std.debug.print("on", .{});
+    } else {
+        std.debug.print("off", .{});
+    }
+}