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

src/main.zig

@@ -2,6 +2,10 @@ const zocket = @import("zocket");
 
 const std     = @import("std");
 const builtin = @import("builtin");
+const options = @import("build_options");
+
+
+const args = zocket.deps.args;
 
 pub fn main(init: std.process.Init) !void
 {
@@ -12,20 +16,36 @@ pub fn main(init: std.process.Init) !void
         var arena: std.heap.DebugAllocator(.{}) = .init;
         defer _ = arena.deinit();
 
-        try run(io, arena.allocator(), "zocket/config.toml");
+        try run(io, arena.allocator(), "config/config.toml");
     }
     else
     {
         var arena = std.heap.ArenaAllocator.init(std.heap.smp_allocator);
         defer arena.deinit();
-
         const allocator = arena.allocator();
 
         var tmpArena       = std.heap.ArenaAllocator.init(std.heap.smp_allocator);
         const tmpAllocator = tmpArena.allocator();
 
-        const exe  = try std.process.executableDirPathAlloc(io, tmpAllocator);
-        const path = try std.fs.path.join(allocator, &.{ exe, "zocket/config.toml" });
+        var parser = try args.ArgumentParser.init(tmpAllocator, .{
+            .name        = "zocket",
+            .version     = options.version,
+            .description = "A lightweight Zig WebSocket server and mesh routing daemon.",
+        });
+
+        try parser.addOption("path", .{
+            .short = 'p',
+            .help  = "Configuration-File Path (*.toml)",
+        });
+
+        var result = try parser.parseProcess(init);
+
+        const tmpPath = result.getString("path") orelse blk: {
+            const exe = try std.process.executableDirPathAlloc(io, tmpAllocator);
+            break :blk  try std.Io.Dir.path.join(tmpAllocator, &.{ exe, "config/config.toml" });
+        };
+
+        const path = try allocator.dupe(u8, tmpPath);
 
         tmpArena.deinit();
 
@@ -35,7 +55,16 @@ pub fn main(init: std.process.Init) !void
 
 fn run(io: std.Io, allocator: std.mem.Allocator, path: []const u8) !void
 {
-    const parsed = try zocket.config.parse(io, allocator, path);
+    const parsed = zocket.config.parse(io, allocator, path) catch |err|
+    {
+        const msg: []const u8 = switch (err) {
+            error.FileNotFound => "File not found",
+            error.AccessDenied => "Permission denied reading",
+            else               => "Unexpected error opening",
+        };
+        std.log.err("{s}: '{s}' ({any})\n", .{ msg, path, err });
+        std.process.exit(1);
+    };
     defer parsed.deinit();
 
     const configuration = parsed.value;