Implement sub-command parsing + add on/word/line/over commands

src/index.ts

@@ -13,7 +13,7 @@ input.subscribe(line => log.verbose('input', { line }))
 const lexer = new Lexer(input)
 lexer.subscribe(token => log.verbose('token', token))
 
-const parser = new Parser(lexer, commands)
+const parser = new Parser(commands, lexer)
 parser.subscribe(exec => log.verbose('exec', exec))
 
 input.setupPrompt()