Proper usage message

CHANGELOG.md

@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- Builtin documentation for builtin functions display from repl and command line
+- Builtin documentation for builtin functions display from repl and command line.
 - Suggestions which command line parameters user may wanted to use
 
 ### Changed

musique/main.cc

@@ -39,23 +39,26 @@ static unsigned repl_line_number = 1;
 [[noreturn]] void usage()
 {
 	std::cerr <<
-		"usage: musique <options> [filename]\n"
+		"usage: musique [subcommand]...\n"
-		"  where filename is path to file with Musique code that will be executed\n"
+		"  where available subcommands are:\n"
-		"  where options are:\n"
+		"    run FILENAME\n"
-		"    -c,--run CODE\n"
+		"      executes given file\n"
-		"      executes given code\n"
-		"    -I,--interactive,--repl\n"
-		"      enables interactive mode even when another code was passed\n"
 		"\n"
-		"    -f,--as-function FILENAME\n"
+		"    fun FILENAME\n"
-		"      deffer file execution and turn it into a file\n"
+		"      load file as function\n"
 		"\n"
-		"    --ast\n"
+		"    repl\n"
-		"      prints ast for given code\n"
+		"      enter interactive enviroment\n"
 		"\n"
-		"    -v,--version\n"
+		"    version\n"
 		"      prints Musique interpreter version\n"
 		"\n"
+		"    doc BUILTIN\n"
+		"      print documentation for given builtin function\n"
+		"\n"
+		"    help\n"
+		"      prints this message\n"
+		"\n"
 		"Thanks to:\n"
 		"  Sy Brand, https://sybrand.ink/, creator of tl::expected https://github.com/TartanLlama/expected\n"
 		"  Justine Tunney, https://justinetunney.com, creator of bestline readline library https://github.com/jart/bestline\n"