rodo/args.rkt

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#lang racket/base
(require (prefix-in vector: racket/vector)
(prefix-in list: racket/list)
(prefix-in config: "config.rkt")
(prefix-in init: "init.rkt")
(prefix-in util: "util.rkt")
(prefix-in messages: "messages.rkt"))
(provide (all-defined-out))
(define (check-args args)
(let ([args-length (vector-length args)])
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(cond [(equal? args-length 0)
(util:display-hash-ref messages:messages 'show-usage)]
;; ls
[(and (equal? args-length 1)
(equal? (vector:vector-member config:list-command args) 0))
(util:show-list-from-file config:path-to-list-file)]
;; add
[(and (or (equal? args-length 2) (>= args-length 2))
(equal? (vector-ref args 0) config:add-command))
(util:add-item-to-list config:path-to-list-file args)]
;; rm
[(and (equal? args-length 2)
(equal? (vector-ref args 0) config:remove-command)
(real? (string->number (vector-ref args 1)))
(or (positive? (string->number (vector-ref args 1)))
(zero? (string->number (vector-ref args 1))))
;; Length subtract one because the numbering starts at zero
(not (> (string->number (vector-ref args 1)) (sub1 (length (util:file->string-list config:path-to-list-file))))))
(util:remove-item-from-list config:path-to-list-file args)]
;; init
[(and (equal? args-length 1)
(equal? (vector:vector-member config:initialize-command args) 0))
(init:initialize)]
;; help
[(and (equal? args-length 1)
(member (vector-ref args 0) config:help-command))
(util:display-hash-ref messages:messages 'show-help)]
[else
(util:display-hash-ref messages:messages 'show-usage)])))