attempting a cleanup of this awful old code haha
m455
parent
b0976283c9
commit
672bf1d6c9
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@ -8,92 +8,91 @@
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;; ------------------------------------------------
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;; Constants
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;; ------------------------------------------------
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(define help-command-1 "help")
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(define help-command-2 "--help")
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(define help-command-3 "-h")
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(define init-command "init")
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(define ls-command "ls")
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(define rm-command "rm")
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(define add-command "add")
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(define program-name "nicethings")
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(define program-file (string-append "." program-name))
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(define program-path (build-path (find-system-path 'home-dir) program-file))
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(define program-permissions 420) ;; 644/-rw-r--r-- permissions
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(define newline "\n")
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(define double-newline "\n\n")
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(define help-command-1 "help")
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(define help-command-2 "--help")
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(define help-command-3 "-h")
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(define init-command "init")
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(define ls-command "ls")
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(define rm-command "rm")
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(define add-command "add")
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(define program-name "nicethings")
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(define program-file (string-append "." program-name))
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(define program-path (path->string (build-path (find-system-path 'home-dir) program-file)))
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(define read-permissions 420)
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(define newline "\n")
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(define double-newline "\n\n")
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;; ------------------------------------------------
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;; Messages
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;; ------------------------------------------------
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(define messages
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(hash
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'error-too-many-arguments
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(format (string-append "Error: Too many arguments." newline
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"Try running '~a ~a' for more information.")
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program-name
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help-command-1)
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(hash 'error-too-many-arguments
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(format (string-append "Error: Too many arguments." newline
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"Try running '~a ~a' for more information.")
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program-name
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help-command-1)
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'error-incorrect-usage
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(format (string-append "Error: Incorrect usage." newline
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"Try running '~a ~a' for more information.")
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program-name
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help-command-1)
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'error-incorrect-usage
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(format (string-append "Error: Incorrect usage." newline
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"Try running '~a ~a' for more information.")
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program-name
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help-command-1)
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'error-file-already-exists
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(format "Error: The file '~a' already exists." program-path)
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'couldnt-find-file
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(format (string-append "Error: Couldn't find ~a" newline
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"Either the file doesn't exist, or the permissions are incorrect." newline
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"If the file exists, try running chmod 600 ~a"
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"If the file doesn't exist, try running ~a ~a")
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program-path
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program-path
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program-name
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init-command)
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'error-fake-file-exists
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(format (string-append "Error: The directory '~a' exists." newline
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"Try moving, renaming, or deleting this directory.")
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program-path)
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'error-something-exists
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(format "Error: It looks like ~a already exists." program-path)
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'error-file-doesnt-exist
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(format (string-append "Error: '~a' doesn't exist." newline
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"Try running '~a ~a'.")
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program-path
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program-name
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init-command)
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'error-file-doesnt-exist
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(format (string-append "Error: '~a' doesn't exist." newline
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"Try running '~a ~a'.")
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program-path
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program-name
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init-command)
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'error-item-not-found
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"Error: Item not found."
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'error-item-not-found
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"Error: Item not found."
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'error-not-an-option
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"Error: not an option."
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'warning-permissions
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(format (string-append "Warning: The permissions on your '~a' file are incorrect." newline
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"Other users on this host may be able to read your file." newline
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"Try running 'chmod 600 ~a' to fix this." newline)
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program-path
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program-path)
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'error-not-a-number
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"Error: not a number."
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'init-cancelled
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(format "Cancelled the creation of '~a'." program-path)
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'warning-permissions
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(format (string-append "Warning: The permissions on your '~a' file are incorrect." newline
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"Other users on this host may be able to read your file." newline
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"Try running 'chmod 600 ~a' to fix this." newline)
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program-path
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program-path)
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'init-prompt
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(format (string-append "~a will create '~a'." newline
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"Is this okay? [y/n]")
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program-name
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program-path)
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'init-cancelled
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(format "Cancelled the creation of '~a'." program-path)
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'file-created
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(format "Successfully created ~a." program-path)
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'init-prompt
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(format (string-append "The file '~a' will be created." newline
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"Is this okay? [y/n]")
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program-path)
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'empty-list
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"There is nothing in your list."))
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'file-created
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(format "Successfully created ~a." program-path)
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(define formatees
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(hash
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'error-not-an-option
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(string-append "Error: '~a' is not an option." newline
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"Please choose 'y' or 'n'.")
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'empty-list
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"There is nothing in your list."
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'error-not-a-number
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(string-append "Error: '~a' is not a number.")
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'added
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"Added '~a' to your list."
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'added
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"Added '~a' to your list."
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'removed
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"Removed '~a' from your list."))
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'removed
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"Removed '~a' from your list."))
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;; ------------------------------------------------
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;; helpers
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@ -101,177 +100,121 @@
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(define (messages-ref key)
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(hash-ref messages key))
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(define (formatees-ref key)
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(hash-ref formatees key))
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(define (displayln-messages-ref key)
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(let ([message (messages-ref key)])
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(displayln message)))
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(displayln (messages-ref key)))
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(define (displayln-formatees-ref key string)
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(let* ([formatee (formatees-ref key)]
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[formatee-formatted (format formatee string)])
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(displayln formatee-formatted)))
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(define (displayln-format-messages-ref key value)
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(displayln (format (messages-ref key) value)))
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(define (create-file string)
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(close-output-port
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(open-output-file string)))
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(define (has-program-permissions? string)
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(equal? program-permissions (file-or-directory-permissions string 'bits)))
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;; ------------------------------------------------
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;; Check conditions
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;; ------------------------------------------------
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(define (check-conditions)
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(cond
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[(directory-exists? program-path)
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(begin (displayln-messages-ref 'error-fake-file-exists)
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(exit))]
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[(not (file-exists? program-path))
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(begin (displayln-messages-ref 'error-file-doesnt-exist)
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(exit))]
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[(not (has-program-permissions? program-path))
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(displayln-messages-ref 'warning-permissions)]
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[else 'do-nothing]))
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(close-output-port (open-output-file string)))
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(define (has-read-permissions? string)
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(equal? read-permissions (file-or-directory-permissions string 'bits)))
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;; ------------------------------------------------
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;; init
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;; ------------------------------------------------
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(define (init/create-file)
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(create-file program-path)
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(file-or-directory-permissions program-path
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program-permissions)
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(displayln-messages-ref 'file-created))
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(define (init/cancel)
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(displayln-messages-ref 'init-cancelled)
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(exit))
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(define (init/create-file)
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(create-file program-path)
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(file-or-directory-permissions program-path read-permissions)
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(displayln-messages-ref 'file-created))
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(define (init/prompt)
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(displayln-messages-ref 'init-prompt)
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(display "> ")
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(let* ([input (read-line)]
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[input-symbol (string->symbol input)])
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(let ([input-symbol (string->symbol (read-line))])
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(case input-symbol
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['y (init/create-file)]
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['n (init/cancel)]
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[else (displayln-formatees-ref 'error-not-an-option input)])))
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['y (init/create-file)]
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['n (init/cancel)]
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[else (displayln-messages-ref 'error-not-an-option)])))
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(define (init)
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(cond
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[(file-exists? program-path)
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(displayln-messages-ref 'error-file-already-exists)]
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[(directory-exists? program-path)
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(displayln-messages-ref 'error-fake-file-exists)]
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[else (init/prompt)]))
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(if (or (file-exists? program-path)
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(directory-exists? program-path))
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(displayln-messages-ref 'error-something-exists)
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(init/prompt)))
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;; ------------------------------------------------
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;; ls
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;; ------------------------------------------------
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(define (ls/display-list listof-items)
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;; The add1 in the first binding starts the
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;; listof-numbers at 1 instead of 0 to make the
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;; list numbering more human-friendly
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(let* ([listof-numbers (map add1 (range (length listof-items)))]
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[listof-number-strings (map number->string listof-numbers)]
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[combine-lists (lambda (a b) (string-append a ". " b))]
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[listof-numbered-items (map combine-lists
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(let* ([listof-number-strings (map number->string (range (length listof-items)))]
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[listof-numbered-items (map (lambda (a b) (string-append a ". " b))
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listof-number-strings
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listof-items)])
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(for ([item listof-numbered-items])
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(displayln item))))
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(define (ls)
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(check-conditions)
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(let ([listof-items (file->lines program-path)])
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(if (null? listof-items)
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(if (and (file-exists? program-file)
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(has-read-permissions? program-file))
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(let ([listof-items (file->lines program-path)])
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(if (null? listof-items)
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(displayln-messages-ref 'empty-list)
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(ls/display-list listof-items))))
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(ls/display-list listof-items)))
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(displayln-messages-ref 'couldnt-file-file)))
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;; ------------------------------------------------
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;; rm
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;; ------------------------------------------------
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(define (rm/remove-item listof-items item-number)
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(let* ([item-to-remove (list-ref listof-items item-number)]
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[list-without-item (remove item-to-remove listof-items)])
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(display-lines-to-file list-without-item
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program-path
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#:exists 'truncate)
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(displayln-formatees-ref 'removed item-to-remove)))
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(define (rm/process-string string)
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(let* ([listof-items (file->lines program-path)]
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[item-number (string->number string)]
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;; Subtract 1 from the user's original number,
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;; because we want to convert the number from
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;; human numbers (1 2 3) to index numbers
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;; (0 1 2)
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[item-number-sub1 (sub1 item-number)]
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[list-length (length listof-items)])
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(define (rm/remove-nicething item-number)
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(let ([listof-items (file->lines program-path)])
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(if (and (not (null? listof-items))
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(number? item-number)
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(positive? item-number)
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;; Don't allow numbers that are equal to
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;; or greater than list-length, because
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;; the list index starts at 0
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;;
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;; Example:
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;; Length of (1 2 3) = 3
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;;
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;; To reference the highest number, we
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;; use (list-ref (1 2 3) 2)
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(< item-number-sub1 list-length))
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(rm/remove-item listof-items item-number-sub1)
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(displayln-messages-ref 'error-item-not-found))))
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(>= item-number 0)
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(< item-number (length listof-items)))
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(let* ([item-to-remove (list-ref listof-items item-number)]
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[list-without-item (remove item-to-remove listof-items)])
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(display-lines-to-file list-without-item program-path #:exists 'truncate)
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(displayln-format-messages-ref 'removed item-to-remove))
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(displayln-messages-ref 'error-item-not-found))))
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(define (rm string)
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(check-conditions)
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(if (string->number string)
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(rm/process-string string)
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(displayln-formatees-ref 'error-not-a-number string)))
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(define (rm arg)
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(if (and (file-exists? program-file)
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(has-read-permissions? program-file))
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(let ([item-number (string->number arg)])
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(if item-number
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(rm/remove-nicething item-number)
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(displayln-format-messages-ref 'error-not-a-number arg)))
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(displayln-messages-ref 'couldnt-find-file)))
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;; ------------------------------------------------
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;; add
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;; ------------------------------------------------
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(define (add string)
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(check-conditions)
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;; The removing and adding of the '\n' is to
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;; ensure only one '\n' exists at the end of the
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;; item to be added.
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(let* ([string-no-newline (string-replace string "\n" "")]
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[string-newline (string-append string-no-newline "\n")])
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(display-to-file string-newline
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program-path
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#:exists 'append)
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(displayln-formatees-ref 'added string-no-newline)))
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(define (add nicething)
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(if (and (file-exists? program-file)
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(has-read-permissions? program-file))
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;; The removing and adding of the '\n' is to
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;; ensure only one '\n' exists at the end of the
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;; item to be added.
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(let* ([nicething-no-newline (string-replace nicething "\n" "")]
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[nicething-newline (string-append nicething-no-newline "\n")])
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(display-to-file nicething-newline program-path #:exists 'append)
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(displayln-format-messages-ref 'added nicething-no-newline))
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(displayln-messages-ref 'couldnt-find-file)))
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;; ------------------------------------------------
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;; random message
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;; ------------------------------------------------
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(define (random-message/append-program-file home-directory)
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(build-path home-directory program-file))
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(define (random-message)
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(let* ([root (find-system-path 'sys-dir)] ;; /
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[root-home (build-path root "home")] ;; /home
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(let* ([root-home (build-path (find-system-path 'sys-dir) "home")] ;; /home
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;; `#:build? #t` Builds full paths for all items listed in /home/
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[listof-home-directories (directory-list root-home #:build? #t)]
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[listof-nicethings-paths (map random-message/append-program-file listof-home-directories)]
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[directories-with-nicethings (filter file-exists? listof-nicethings-paths)]
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[directories-with-644 (filter has-program-permissions? directories-with-nicethings)]
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[listof-nicethings (apply append (map file->lines directories-with-644))]
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[list-length (length listof-nicethings)])
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[listof-home-directories (directory-list root-home #:build? #t)]
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[listof-nicethings-paths (map (lambda (x) (build-path x program-file))
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listof-home-directories)]
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[paths-with-nicethings (filter file-exists? listof-nicethings-paths)]
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[paths-readable (filter has-read-permissions? paths-with-nicethings)]
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[listof-nicethings (apply append (map file->lines paths-readable))]
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[list-length (length listof-nicethings)])
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(when (not (zero? list-length))
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(let* ([random-number (random list-length)]
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[random-nicething (list-ref listof-nicethings random-number)])
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(displayln random-nicething)))))
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(let* ([random-number (random list-length)]
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[random-nicething (list-ref listof-nicethings random-number)]
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[nicething-trimmed (string-replace random-nicething "\n" "")])
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(displayln nicething-trimmed)))))
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;; ------------------------------------------------
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;; help
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@ -279,26 +222,26 @@
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(define (help)
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(displayln
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(string-append
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"Usage:" newline
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(format " ~a [<command>] [<args>]" program-name)
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double-newline
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"Usage:" newline
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(format " ~a [<command>] [<args>]" program-name)
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double-newline
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"Commands:" newline
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" No command - Displays a random nicething from a random user." newline
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(format " ~a - Creates a file in ~a, which allows you to contribute to the town-wide list of nicethings."
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init-command
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program-path) newline
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(format " ~a - Adds a nicething to your list." add-command) newline
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(format " ~a - Prints a numbered list of the nicethings you've added." ls-command) newline
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(format " ~a - Removes a nicething from your list." rm-command)
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double-newline
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"Commands:" newline
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" No command - Displays a random nicething from a random user." newline
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(format " ~a - Creates a file in ~a, which allows you to contribute to the town-wide list of nicethings."
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init-command
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program-path) newline
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(format " ~a - Adds a nicething to your list." add-command) newline
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(format " ~a - Prints a numbered list of the nicethings you've added." ls-command) newline
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(format " ~a - Removes a nicething from your list." rm-command)
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double-newline
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"Examples:" newline
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(format " ~a" program-name) newline
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(format " ~a ~a" program-name init-command) newline
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(format " ~a ~a \"You are wonderful\"" program-name add-command) newline
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(format " ~a ~a" program-name ls-command) newline
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(format " ~a ~a 2" program-name rm-command))))
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"Examples:" newline
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(format " ~a" program-name) newline
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(format " ~a ~a" program-name init-command) newline
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(format " ~a ~a \"You are wonderful\"" program-name add-command) newline
|
||||
(format " ~a ~a" program-name ls-command) newline
|
||||
(format " ~a ~a 2" program-name rm-command))))
|
||||
|
||||
(define (process-args vectorof-args)
|
||||
(match vectorof-args
|
||||
|
|
@ -308,7 +251,7 @@
|
|||
[(vector (== ls-command)) (ls)]
|
||||
[(vector (== init-command)) (init)]
|
||||
[(vector (== add-command) a) (add a)]
|
||||
[(vector (== rm-command) a) (rm a)]
|
||||
[(vector (== rm-command) a) (rm a)]
|
||||
[_ (random-message)]
|
||||
[(vector _ ...) (displayln-messages-ref 'error-incorrect-usage)]))
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue