Program for theme switching on Linux Calling Atuin everytime switching theme is not smart way to do.

Changes

5 changed files (+237/-0)

• .editorconfig
  • @@ -26,3 +26,8 @@ # Nix has a bug that when multiline string uses tab for indent they are not
    # stripped (dedent does not work with tab indentation) # https://github.com/NixOS/nix/issues/3759 indent_style = space + + [*.zig] + # Zig compiler rejects tabs. + indent_style = space + indent_size = 4
• flake.nix
  • @@ -86,6 +86,7 @@
    home.packages = [ pkgs.home-manager (pkgs.callPackage ./programs/hm-clean { }) + (pkgs.callPackage ./programs/theme { }) ]; features = nixpkgs.lib.mkDefault {
  • @@ -204,6 +205,26 @@ (system: {
    name = system; value = nixpkgs.legacyPackages.${system}.nixpkgs-fmt; }) + availableSystems + ); + + devShell = builtins.listToAttrs ( + builtins.map + (system: + let + pkgs = nixpkgs.legacyPackages.${system}; + in + { + name = system; + value = + pkgs.mkShell { + packages = with pkgs; [ + zig + go + ]; + }; + } + ) availableSystems ); };
• programs/theme/build.zig (new)
  • @@ -0,0 +1,31 @@
    + // Copyright 2025 Shota FUJI <pockawoooh@gmail.com> + // + // Licensed under the Apache License, Version 2.0 (the "License"); + // you may not use this file except in compliance with the License. + // You may obtain a copy of the License at + // + // http://www.apache.org/licenses/LICENSE-2.0 + // + // Unless required by applicable law or agreed to in writing, software + // distributed under the License is distributed on an "AS IS" BASIS, + // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + // See the License for the specific language governing permissions and + // limitations under the License. + // + // SPDX-License-Identifier: Apache-2.0 + + const std = @import("std"); + + pub fn build(b: *std.Build) void { + const target = b.standardTargetOptions(.{}); + const optimize = b.standardOptimizeOption(.{}); + + const exe = b.addExecutable(.{ + .name = ",theme", + .root_source_file = b.path("main.zig"), + .target = target, + .optimize = optimize, + }); + + b.installArtifact(exe); + }
• programs/theme/default.nix (new)
  • @@ -0,0 +1,59 @@
    + # Copyright 2025 Shota FUJI <pockawoooh@gmail.com> + # + # Licensed under the Apache License, Version 2.0 (the "License"); + # you may not use this file except in compliance with the License. + # You may obtain a copy of the License at + # + # http://www.apache.org/licenses/LICENSE-2.0 + # + # Unless required by applicable law or agreed to in writing, software + # distributed under the License is distributed on an "AS IS" BASIS, + # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + # See the License for the specific language governing permissions and + # limitations under the License. + # + # SPDX-License-Identifier: Apache-2.0 + + { pkgs, stdenvNoCC, installShellFiles, zig }: + stdenvNoCC.mkDerivation rec { + pname = "my-theme"; + version = "1.0.0"; + + runtimeInputs = [ pkgs.glib ]; + + nativeBuildInputs = [ zig.hook installShellFiles ]; + + src = ./.; + + meta = { + mainProgram = ",theme"; + }; + + postInstall = '' + installShellCompletion --zsh --cmd ${pname} <(cat << "EOF" + #compdef ${meta.mainProgram} + + function _${pname} { + local line state + + _arguments -C \ + "1: :->variant" + + case "$state" in + (variant) + _values "variant" \ + "system" \ + "dark" \ + "light" + ;; + esac + } + + if [ "$funcstack[1]" = "_${pname}" ]; then + _${pname} "$@" + else + compdef _${pname} "${meta.mainProgram}" + fi + EOF) + ''; + }
• programs/theme/main.zig (new)
  • @@ -0,0 +1,121 @@
    + // Copyright 2025 Shota FUJI <pockawoooh@gmail.com> + // + // Licensed under the Apache License, Version 2.0 (the "License"); + // you may not use this file except in compliance with the License. + // You may obtain a copy of the License at + // + // http://www.apache.org/licenses/LICENSE-2.0 + // + // Unless required by applicable law or agreed to in writing, software + // distributed under the License is distributed on an "AS IS" BASIS, + // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + // See the License for the specific language governing permissions and + // limitations under the License. + // + // SPDX-License-Identifier: Apache-2.0 + + //! Over-powered theme switcher. + + const std = @import("std"); + + const ExitCode = enum(u8) { + ok = 0, + generic_error = 1, + incorrect_usage = 2, + + pub fn to_u8(self: @This()) u8 { + return @intFromEnum(self); + } + }; + + const GnomeColorScheme = enum { + default, + @"prefer-dark", + @"prefer-light", + + pub fn from_variant(variant: Variant) @This() { + return switch (variant) { + .system => .default, + .dark => .@"prefer-dark", + .light => .@"prefer-light", + }; + } + }; + + const Variant = enum { + system, + dark, + light, + + pub fn from_string(str: []const u8) ?@This() { + inline for (@typeInfo(Variant).@"enum".fields) |field| { + if (std.mem.eql(u8, field.name, str)) { + return @enumFromInt(field.value); + } + } + + return null; + } + }; + + pub fn main() !u8 { + var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator); + defer arena.deinit(); + + const allocator = arena.allocator(); + + var iter = try std.process.ArgIterator.initWithAllocator(allocator); + defer iter.deinit(); + + // Skip program name. + _ = iter.next(); + + const initial_arg = iter.next() orelse { + std.log.err("Argument is required.", .{}); + return ExitCode.incorrect_usage.to_u8(); + }; + + const variant: Variant = Variant.from_string(initial_arg) orelse { + std.log.err("Unknown variant \"{s}\".", .{initial_arg}); + return ExitCode.incorrect_usage.to_u8(); + }; + + if (iter.next()) |_| { + std.log.err("Too many arguments.", .{}); + return ExitCode.incorrect_usage.to_u8(); + } + + const gnome_color_scheme = GnomeColorScheme.from_variant(variant); + + { + const result = try std.process.Child.run(.{ + .allocator = allocator, + .argv = &.{ + "gsettings", + "set", + "org.gnome.desktop.interface", + "color-scheme", + @tagName(gnome_color_scheme), + }, + }); + defer allocator.free(result.stdout); + defer allocator.free(result.stderr); + + switch (result.term) { + .Exited => |code| { + if (code != 0) { + std.log.err("gsettings command exited with non-zero code: {d}", .{code}); + return ExitCode.generic_error.to_u8(); + } + }, + else => { + std.log.err("gsettings command terminated unexpectedly.", .{}); + return ExitCode.generic_error.to_u8(); + }, + } + + std.log.info("Set GNOME color scheme to {s}", .{@tagName(gnome_color_scheme)}); + } + + return ExitCode.ok.to_u8(); + }