CLI reference

The main commands are:

Command	Purpose
flexr check SPEC	Parse and diagnose a specification
flexr generate SPEC -o OUTPUT	Write generated Ruby
flexr trace SPEC INPUT	Show automaton state, acceptance, and transitions
flexr --help	Print command and option help

Use check in CI and treat warnings according to the compatibility policy of your project. trace describes DFA behavior; it is not an input-string logging command.

bundle exec flexr check examples/calculator/lexer.flexr.rb
bundle exec flexr generate examples/calculator/lexer.flexr.rb -o tmp/calculator_lexer.rb

For complete options, output formats, and exit status behavior, see the repository’s CLI reference.