57 lines
1.5 KiB
Scheme
57 lines
1.5 KiB
Scheme
(define-library (picrin main)
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(import (scheme base)
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(scheme read)
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(scheme write)
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(scheme process-context)
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(scheme load)
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(scheme eval)
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(picrin base)
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(picrin repl))
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(define (print-help)
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(display "picrin scheme\n")
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(display "\n")
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(display "Usage: picrin [options] [file]\n")
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(display "\n")
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(display "Options:\n")
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(display " -e [program] run one liner script\n")
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(display " -l [file] load the file then enter repl\n")
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(display " -h or --help show this help\n"))
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(define (getopt)
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(let ((args (cdr (command-line))))
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(if (null? args)
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(values 'repl #f)
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(case (string->symbol (car args))
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((-h --help)
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(print-help)
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(exit 1))
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((-e)
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(values 'line (cadr args)))
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((-l)
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(values 'load (cadr args)))
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(else
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(values 'file (car args)))))))
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(define (exec-file filename)
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(load filename))
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(define (exec-line str)
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(call-with-port (open-input-string str)
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(lambda (in)
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(let loop ((expr (read in)))
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(unless (eof-object? expr)
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(eval expr (find-library "picrin.user"))
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(loop (read in)))))))
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(define (main)
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(call-with-values getopt
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(lambda (type dat)
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(case type
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((repl) (repl))
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((load) (load dat) (repl))
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((line) (exec-line dat))
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((file) (exec-file dat))))))
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(export main))
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