lp.update -> lp.checkVersion + honor --check in version

src/lightpanda.zig

@@ -225,8 +225,7 @@ fn dumpContent(app: *App, mode: Config.DumpFormat, dump_opts: dump.Opts, frame:
     }
 }
 
-/// Check `Config.zig` for `options`.
-pub fn update(allocator: std.mem.Allocator, config: *const Config) !void {
+pub fn checkVersion(allocator: std.mem.Allocator, config: *const Config) !void {
     var client = try Updater.init(allocator, config);
     defer client.deinit();
 
@@ -234,7 +233,6 @@ pub fn update(allocator: std.mem.Allocator, config: *const Config) !void {
     var buf: [4096]u8 = undefined;
     var writer = stdout.writer(&buf);
     const w = &writer.interface;
-    // Inform to stdout about version.
     try client.inform(w);
 }
 

src/main.zig

@@ -71,9 +71,13 @@ fn run(allocator: Allocator, main_arena: Allocator) !void {
 
     switch (args.mode) {
         .help => |tag| return args.printUsageAndExit(tag, true),
-        .version => {
-            var stdout = std.fs.File.stdout().writer(&.{});
-            try stdout.interface.print("{s}\n", .{lp.build_config.version});
+        .version => |opts| {
+            if (opts.check) {
+                try lp.checkVersion(allocator, &args);
+            } else {
+                var stdout = std.fs.File.stdout().writer(&.{});
+                try stdout.interface.print("{s}\n", .{lp.build_config.version});
+            }
             return std.process.cleanExit();
         },
         .agent => |opts| if (opts.list_models) {