120 lines
4.2 KiB
Racket
120 lines
4.2 KiB
Racket
#lang racket/base
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(require (prefix-in file: racket/file)
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(prefix-in list: racket/list)
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(prefix-in string: racket/string)
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(prefix-in config: "config.rkt")
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(prefix-in messages: "messages.rkt"))
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(provide (all-defined-out))
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(define (create-file-600 a-file)
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(let ([opened-file (open-output-file a-file #:mode 'text #:exists 'truncate)])
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(close-output-port opened-file))
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(file-or-directory-permissions a-file #o600))
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(define (create-directory-700 a-directory)
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(make-directory a-directory)
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(file-or-directory-permissions a-directory #o700))
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(define (display-messages key-list)
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(for ([key key-list])
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(display (hash-ref messages:messages key))))
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(define (list->ascending-numbers lst)
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(list:range (length lst)))
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(define (list->dotted-ascending-numbers lst)
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(map (lambda (x) (string-append x ". "))
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(map number->string (list->ascending-numbers lst))))
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(define (list->numbered-list lst)
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(map (lambda (x y) (string-append x y))
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(list->dotted-ascending-numbers lst)
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lst))
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(define (file->vertically-numbered-list a-file)
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(string:string-join
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(list->numbered-list (file:file->lines a-file))
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"\n"
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#:after-last "\n"))
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(define (surround-with-quotation-marks item)
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(string-append "\"" item "\""))
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(define (display-item-added item-to-add)
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(display (format (hash-ref messages:messages 'item-added) item-to-add)))
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(define (display-item-removed item-to-remove)
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(display (format (hash-ref messages:messages 'item-removed) item-to-remove)))
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(define (check-list-conditions)
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(cond
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;; If exists and not empty
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[(and (file-exists? config:list-file)
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(not (null? (file:file->lines config:list-file))))
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(display (file->vertically-numbered-list config:list-file))]
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;; If exists and empty
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[(and (file-exists? config:list-file)
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(null? (file:file->lines config:list-file)))
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(display-messages '(empty-list))]
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;; If not exist
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[(and (not (file-exists? config:list-file)))
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(display-messages '(file-not-found try-init))]
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[else (display-messages '(show-usage))]))
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(define (append-element-to-end-of-list lst item-to-add)
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(reverse (cons item-to-add (reverse (file:file->lines lst)))))
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(define (add-item-to-list args)
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(let* ([item-to-add (string:string-join (cdr args) " ")]
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[new-list (append-element-to-end-of-list config:list-file item-to-add)])
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(file:display-lines-to-file new-list
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config:list-file
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#:mode 'text
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#:exists 'truncate)
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(display-item-added item-to-add)))
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(define (check-add-conditions args)
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(if (and (file-exists? config:list-file))
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(add-item-to-list args)
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;; Otherwise
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(display-messages '(file-not-found try-init))))
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(define (remove-item-from-list user-args)
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(let* ([item-to-remove (list-ref (file:file->lines config:list-file) user-args)]
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[new-list (remove item-to-remove (file:file->lines config:list-file))])
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(file:display-lines-to-file new-list
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config:list-file
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#:mode 'text
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#:exists 'truncate)
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(display-item-removed item-to-remove)))
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(define (check-remove-conditions args)
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(cond
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;; If directory and file exist, but file is empty
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[(and (directory-exists? config:program-directory)
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(file-exists? config:list-file)
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(null? config:list-file))
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(display-messages '(empty-list))]
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;; If directory and file exist, and file is not empty
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[(and (directory-exists? config:program-directory)
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(file-exists? config:list-file)
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(not (null? config:list-file)))
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(let ([user-args (string->number (list-ref args 1))]
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;; Length subtract one because the numbering starts at zero
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[list-length (sub1 (length (file:file->lines config:list-file)))])
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(if (not (> user-args list-length))
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(remove-item-from-list user-args)
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;; Otherwise
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(display-messages '(item-not-found))))]
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;; If directory and file don't exist
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[(and (not (directory-exists? config:program-directory))
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(not (file-exists? config:list-file)))
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(display-messages '(file-not-found try-init))]))
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