143 lines
4.9 KiB
Racket
143 lines
4.9 KiB
Racket
#lang racket/base
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(require (prefix-in list: racket/list)
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(prefix-in file: racket/file)
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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 (check-for-file)
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(file-exists? config:path-to-file))
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(define (create-file)
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(let ([opened-file
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(open-output-file config:path-to-file
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#:mode 'text
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#:exists 'truncate)])
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(close-output-port opened-file))
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(file-or-directory-permissions config:path-to-file #o600))
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(define (check-for-directory)
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(directory-exists? config:program-directory))
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(define (create-directory)
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(make-directory config:program-directory)
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(file-or-directory-permissions config:program-directory #o700))
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(define (display-hash-ref hash-list key)
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(display (hash-ref hash-list key)))
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;; Just so I don't have to keep typing "#:mode...#:line-mode..." every time
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(define (file->string-list config:path-to-file-to-file)
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(let ([todo-list (file:file->lines config:path-to-file-to-file
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#:mode 'text
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#:line-mode 'any)])
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todo-list))
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(define (list-empty? lst)
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(list:empty? (file->string-list lst)))
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;; Find out which item is being removed by scooping up
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;; the number the user entered in the command line
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;; argument
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(define (get-removed-item lst args)
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;; Subtract one from what the user chose, because they are
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;; are actually viewing the list numbers as human numbers
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;; so (actual-number +1)
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(list-ref (file->string-list lst) (sub1 (string->number args))))
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(define (surround-in-quotes args)
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(display (string-append "\"" args "\"")))
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(define (prefix-with-period lst)
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(string-append lst ". "))
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(define (prefix-with-number lst)
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(map string-append
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;; Note: compose starts from the last element in it's
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;; list, as if it were nested, so that would be add1 here
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(map (compose prefix-with-period number->string add1)
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(list:range (length lst)))
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lst))
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(define (display-prettified-list)
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(display
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(string:string-join
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(prefix-with-number (file->string-list config:path-to-file))
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"\n"
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#:after-last "\n")))
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;; This is a bit of ugly scheme sorcery
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(define (append-to-end args lst)
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(reverse (cons args (reverse (file->string-list lst)))))
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(define (display-item-added args)
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(display-hash-ref messages:messages 'item-added-prefix)
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(surround-in-quotes args)
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(display-hash-ref messages:messages 'item-added-suffix))
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(define (display-item-removed args)
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(display-hash-ref messages:messages 'item-removed-prefix)
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(surround-in-quotes args)
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(display-hash-ref messages:messages 'item-removed-suffix))
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(define (show-list)
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(cond [(and
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(check-for-directory)
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(check-for-file))
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(if
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;; If file exists, see if it's empty, if so
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;; tell the user
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(list-empty? config:path-to-file)
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(display-hash-ref messages:messages 'empty-todo-list)
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;; If file isn't empty, display a pretty list
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(display-prettified-list))]
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;; If file doesn't exist, tell the user
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[else
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(display-hash-ref messages:messages 'file-not-found)
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(display-hash-ref messages:messages 'try-init)]))
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(define (add-item-to-file args)
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;; Add item to end of list and write to file
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(let ([new-list (append-to-end args config:path-to-file)])
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(file:display-to-file
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(string:string-join new-list "\n")
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config:path-to-file
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#:mode 'text
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#:exists 'truncate)
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(display-item-added args)))
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(define (add-item args)
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(if (and
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(check-for-directory)
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(check-for-file))
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;; The cdr here prevents the command line argument "add" from being added to the file
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(add-item-to-file (string:string-join (cdr (vector->list args))))
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(begin
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(display-hash-ref messages:messages 'file-not-found)
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(display-hash-ref messages:messages 'try-init))))
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(define (remove-item-from-file args)
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(let* ([removed-item (get-removed-item config:path-to-file args)]
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[new-list (remove removed-item (file->string-list config:path-to-file))])
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(file:display-to-file
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(string:string-join new-list "\n")
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config:path-to-file
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#:mode 'text
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#:exists 'truncate)
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(display-item-removed removed-item)))
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(define (remove-item args)
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(cond [(list-empty? config:path-to-file)
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(display-hash-ref messages:messages 'empty-todo-list)]
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[(and
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(check-for-directory)
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(check-for-file))
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(remove-item-from-file (vector-ref args 1))]
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[(and (not (check-for-directory)) (not (check-for-file)))
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(begin
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(display-hash-ref messages:messages 'file-not-found)
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(display-hash-ref messages:messages 'try-init))]))
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