From 6bedd37ac71e75be5b66556a2799cdf76ad57488 Mon Sep 17 00:00:00 2001
From: Brandon Lucas <blu@blu.cx>
Date: Wed, 18 Feb 2026 07:34:09 -0500
Subject: [PATCH] fix: show help menu when running lux with no arguments

Previously `lux` with no args entered the REPL. Now it shows the help
menu. Use `lux repl` to start the REPL explicitly.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 src/main.rs | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 43d215d..7d81d62 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -205,6 +205,10 @@ fn main() {
                     compile_to_c(&args[2], output_path, run_after, emit_c);
                 }
             }
+            "repl" => {
+                // Start REPL
+                run_repl();
+            }
             "doc" => {
                 // Generate API documentation
                 generate_docs(&args[2..]);
@@ -214,7 +218,7 @@ fn main() {
                 if !std::path::Path::new(cmd).exists() && !cmd.starts_with('-') && !cmd.contains('.') && !cmd.contains('/') {
                     let known_commands = vec![
                         "fmt", "lint", "test", "watch", "init", "check", "debug",
-                        "pkg", "registry", "serve", "compile", "doc",
+                        "pkg", "registry", "serve", "compile", "doc", "repl",
                     ];
                     let suggestions = diagnostics::find_similar_names(cmd, known_commands.into_iter(), 2);
                     if !suggestions.is_empty() {
@@ -229,8 +233,8 @@ fn main() {
             }
         }
     } else {
-        // Start REPL
-        run_repl();
+        // No arguments — show help
+        print_help();
     }
 }
 
@@ -240,7 +244,8 @@ fn print_help() {
     println!();
     println!("{}", bc("", "Usage:"));
     println!();
-    println!("  {}                        Start the REPL", bc(colors::CYAN, "lux"));
+    println!("  {}                        Show this help", bc(colors::CYAN, "lux"));
+    println!("  {}                   Start the REPL", bc(colors::CYAN, "lux repl"));
     println!("  {} {}             Run a file (interpreter)", bc(colors::CYAN, "lux"), c(colors::YELLOW, "<file.lux>"));
     println!("  {} {} {}   Compile to native binary", bc(colors::CYAN, "lux"), bc(colors::CYAN, "compile"), c(colors::YELLOW, "<file.lux>"));
     println!("  {} {} {} {}   Compile with output name", bc(colors::CYAN, "lux"), bc(colors::CYAN, "compile"), c(colors::YELLOW, "<f>"), c(colors::YELLOW, "-o app"));