Is there a static analysis tool like Lint or Perl::Critic for shell scripts?

Are there any shell (specifically bash or ksh) checkers that test shell scripts for style, best practices, naming conventions, etc? (Something like Lint for C, or Perl::Critic for Perl.)

I know with ksh you can do syntax checking by running ksh -n script.ksh but I was hoping for something more than just sytax checking - something that parses/analyzes the actual code?

I'm probably out of luck, but I guess it doesn't hurt to ask.