Allow building without X11 support

Signed-off-by: AnErrupTion <anerruption@disroot.org>

build.zig

@@ -13,9 +13,9 @@ comptime {
 }
 
 const ly_version = std.SemanticVersion{ .major = 1, .minor = 1, .patch = 0 };
+
 var dest_directory: []const u8 = undefined;
 var data_directory: []const u8 = undefined;
-var default_tty: u8 = undefined;
 var exe_name: []const u8 = undefined;
 
 const ProgressNode = if (current_zig.minor == 12) *std.Progress.Node else std.Progress.Node;
@@ -23,21 +23,20 @@ const ProgressNode = if (current_zig.minor == 12) *std.Progress.Node else std.Pr
 pub fn build(b: *std.Build) !void {
     dest_directory = b.option([]const u8, "dest_directory", "Specify a destination directory for installation") orelse "";
     data_directory = b.option([]const u8, "data_directory", "Specify a default data directory (default is /etc/ly). This path gets embedded into the binary") orelse "/etc/ly";
-    default_tty = b.option(u8, "default_tty", "set default TTY") orelse 2;
-
     exe_name = b.option([]const u8, "name", "Specify installed executable file name (default is ly)") orelse "ly";
 
     const bin_directory = try b.allocator.dupe(u8, data_directory);
     data_directory = try std.fs.path.join(b.allocator, &[_][]const u8{ dest_directory, data_directory });
 
     const build_options = b.addOptions();
-    build_options.addOption([]const u8, "data_directory", bin_directory);
-
     const version_str = try getVersionStr(b, "ly", ly_version);
+    const default_tty = b.option(u8, "default_tty", "Set the TTY (default is 2)") orelse 2;
+    const enable_x11_support = b.option(bool, "enable_x11_support", "Enable X11 support (default is on)") orelse true;
 
+    build_options.addOption([]const u8, "data_directory", bin_directory);
     build_options.addOption([]const u8, "version", version_str);
-
     build_options.addOption(u8, "tty", default_tty);
+    build_options.addOption(bool, "enable_x11_support", enable_x11_support);
 
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
@@ -59,7 +58,7 @@ pub fn build(b: *std.Build) !void {
 
     exe.addIncludePath(b.path("include"));
     exe.linkSystemLibrary("pam");
-    exe.linkSystemLibrary("xcb");
+    if (enable_x11_support) exe.linkSystemLibrary("xcb");
     exe.linkLibC();
 
     // HACK: Only fails with ReleaseSafe, so we'll override it.

res/lang/en.ini

@@ -45,6 +45,7 @@ insert = insert
 login = login
 logout = logged out
 normal = normal
+no_x11_support = x11 support disabled at compile-time
 numlock = numlock
 password = password
 restart = reboot

res/lang/fr.ini

@@ -45,6 +45,7 @@ insert = insertion
 login = identifiant
 logout = déconnecté
 normal = normal
+no_x11_support = support pour x11 désactivé lors de la compilation
 numlock = verr.num
 password = mot de passe
 restart = redémarrer

src/auth.zig

@@ -1,4 +1,5 @@
 const std = @import("std");
+const build_options = @import("build_options");
 const enums = @import("enums.zig");
 const interop = @import("interop.zig");
 const TerminalBuffer = @import("tui/TerminalBuffer.zig");
@@ -142,7 +143,7 @@ fn startSession(
     switch (current_environment.display_server) {
         .wayland => try executeWaylandCmd(pwd.pw_shell, config.wayland_cmd, current_environment.cmd),
         .shell => try executeShellCmd(pwd.pw_shell),
-        .xinitrc, .x11 => {
+        .xinitrc, .x11 => if (build_options.enable_x11_support) {
             var vt_buf: [5]u8 = undefined;
             const vt = try std.fmt.bufPrint(&vt_buf, "vt{d}", .{config.tty});
             try executeX11Cmd(pwd.pw_shell, pwd.pw_dir, config, current_environment.cmd, vt);

src/config/Lang.zig

@@ -45,6 +45,7 @@ insert: []const u8 = "insert",
 login: []const u8 = "login:",
 logout: []const u8 = "logged out",
 normal: []const u8 = "normal",
+no_x11_support: []const u8 = "x11 support disabled at compile-time",
 numlock: []const u8 = "numlock",
 other: []const u8 = "other",
 password: []const u8 = "password:",

src/main.zig

@@ -128,6 +128,8 @@ pub fn main() !void {
         }
     }
 
+    if (!build_options.enable_x11_support) try info_line.setText(lang.no_x11_support);
+
     interop.setNumlock(config.numlock) catch {};
 
     if (config.initial_info_text) |text| {
@@ -178,14 +180,17 @@ pub fn main() !void {
     desktop.addEnvironment(.{ .Name = lang.shell }, "", .shell) catch {
         try info_line.setText(lang.err_alloc);
     };
-    if (config.xinitrc) |xinitrc| {
-        desktop.addEnvironment(.{ .Name = lang.xinitrc, .Exec = xinitrc }, "", .xinitrc) catch {
-            try info_line.setText(lang.err_alloc);
-        };
+
+    if (build_options.enable_x11_support) {
+        if (config.xinitrc) |xinitrc| {
+            desktop.addEnvironment(.{ .Name = lang.xinitrc, .Exec = xinitrc }, "", .xinitrc) catch {
+                try info_line.setText(lang.err_alloc);
+            };
+        }
     }
 
     try desktop.crawl(config.waylandsessions, .wayland);
-    try desktop.crawl(config.xsessions, .x11);
+    if (build_options.enable_x11_support) try desktop.crawl(config.xsessions, .x11);
 
     var login = try Text.init(allocator, &buffer, config.max_login_len);
     defer login.deinit();