Refactor configuration handling and integrate command-line argument parsing with args.zig

build.zig

@@ -5,6 +5,11 @@ pub fn build(b: *std.Build) void
     const target   = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
+    const version = getGitVersion(b);
+
+    const options = b.addOptions();
+    options.addOption([]const u8, "version", version);
+
     // deps
 
     const toml_dep = b.dependency("toml", .{
@@ -12,6 +17,11 @@ pub fn build(b: *std.Build) void
         .optimize = optimize,
     });
 
+    const args_dep = b.dependency("args", .{
+        .target   = target,
+        .optimize = optimize,
+    });
+
     //
 
     const mod = b.addModule("zocket", .{
@@ -20,6 +30,7 @@ pub fn build(b: *std.Build) void
     });
 
     mod.addImport("toml", toml_dep.module("toml"));
+    mod.addImport("args", args_dep.module("args"));
 
     const exe = b.addExecutable(.{
         .name        = "zocket",
@@ -33,6 +44,8 @@ pub fn build(b: *std.Build) void
         }),
     });
 
+    exe.root_module.addOptions("build_options", options);
+
     //
 
     b.installArtifact(exe);
@@ -63,3 +76,14 @@ pub fn build(b: *std.Build) void
     test_step.dependOn(&run_mod_tests.step);
     test_step.dependOn(&run_exe_tests.step);
 }
+
+fn getGitVersion(b: *std.Build) []const u8
+{
+    const result = b.runAllowFail(
+        &.{ "git", "describe", "--tags", "--always", "--dirty" },
+        undefined,
+        .inherit,
+    ) catch return "0.0.0-unknown";
+
+    return b.dupe(std.mem.trim(u8, result, " \n\r\t"));
+}