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okay i think i figured it out, i needed lambdas to do delay the evaluation!

main
m455 2020-01-26 23:35:53 -05:00
parent 948d1ff3f0
commit 457af43ca2
1 changed files with 17 additions and 19 deletions
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34
utils.rkt
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@ -48,23 +48,21 @@
(display (format (hash-ref messages:messages 'item-removed) item-to-remove))) (display (format (hash-ref messages:messages 'item-removed) item-to-remove)))
(define (check-list-conditions) (define (check-list-conditions)
(let ([file-exists? (lambda () (file-exists? config:list-file))]
[file-null? (lambda () (null? (file:file->lines config:list-file)))])
(cond (cond
;; If list exists and not empty [(and (file-exists?)
[(and (file-exists? config:list-file) (file-null?))
(not (null? (file:file->lines config:list-file))))
(display (file->vertically-numbered-list config:list-file))]
;; If list exists and empty
[(and (file-exists? config:list-file)
(null? (file:file->lines config:list-file)))
(display-messages '(empty-list))] (display-messages '(empty-list))]
;; If not exist [(and (file-exists?)
[(and (not (file-exists? config:list-file))) (not (file-null?)))
(display-messages '(file-not-found (display (file->vertically-numbered-list config:list-file))]
try-init))]
[else (display-messages '(show-usage))])) [(not (file-exists?))
(display-messages '(file-not-found try-init))]
[else (display-messages '(show-usage))])))
(define (append-element-to-end-of-list lst item-to-add) (define (append-element-to-end-of-list lst item-to-add)
(reverse (cons item-to-add (reverse (file:file->lines lst))))) (reverse (cons item-to-add (reverse (file:file->lines lst)))))
@ -85,8 +83,8 @@
(display-messages '(file-not-found (display-messages '(file-not-found
try-init)))) try-init))))
(define (remove-item-from-list user-args) (define (remove-item-from-list args)
(let* ([item-to-remove (list-ref (file:file->lines config:list-file) user-args)] (let* ([item-to-remove (list-ref (file:file->lines config:list-file) args)]
[new-list (remove item-to-remove (file:file->lines config:list-file))]) [new-list (remove item-to-remove (file:file->lines config:list-file))])
(file:display-lines-to-file new-list config:list-file #:mode 'text #:exists 'truncate) (file:display-lines-to-file new-list config:list-file #:mode 'text #:exists 'truncate)
(display-item-removed item-to-remove))) (display-item-removed item-to-remove)))
@ -103,11 +101,11 @@
[(and (directory-exists? config:program-directory) [(and (directory-exists? config:program-directory)
(file-exists? config:list-file) (file-exists? config:list-file)
(not (null? config:list-file))) (not (null? config:list-file)))
(let ([user-args (string->number (list-ref args 1))] (let ([args (string->number (list-ref args 1))]
;; Length subtract one because the numbering starts at zero ;; Length subtract one because the numbering starts at zero
[list-length (sub1 (length (file:file->lines config:list-file)))]) [list-length (sub1 (length (file:file->lines config:list-file)))])
(if (not (> user-args list-length)) (if (not (> args list-length))
(remove-item-from-list user-args) (remove-item-from-list args)
;; Otherwise ;; Otherwise
(display-messages '(item-not-found))))] (display-messages '(item-not-found))))]