Offer a script mode about eisl

[sasagawa888]

I presumed that the proposed -s option is to start in batch mode. Is it correct?

[wasamasa]

Yes.

[sasagawa888]

I Added -s options.

[wasamasa]

Thank you! Note that evaluating (quit) still prints the version number, so that's kind of weird.

[sasagawa888]

I fixed it.

[wasamasa]

Is it though? I wrote a program doing nothing else than (quit) and it crashes:

; ; ./eisl -s ~/code/plt/mal-candidates/islisp/bug.lsp
- good bye -                                                                        
zsh: segmentation fault (core dumped)  ./eisl -s ~/code/plt/mal-candidates/islisp/bug.lsp

gdb doesn't even show a backtrace, just that it happened during a longjmp.

[sasagawa888]

Fixed it. Thank you.

[wasamasa]

Thanks again!