Rewrote nicethings
* Added an implicit `init` procedure instead of doing it automatically * Removed the repair procedures and replaced them with warnings and help messages if permissions are wrong or files are missing * Simplified 'condition' checking, which just checks the permissions and existence of files or directories with the name `.nicethings`cleanup
m455
parent
465f622eaa
commit
67978c4915
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@ -6,165 +6,179 @@
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racket/string)
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;; ------------------------------------------------
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;; values
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;; Constants
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;; ------------------------------------------------
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(define help-command "help")
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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-name-dotted (string-append "." program-name))
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;; /home/username/
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(define home-directory-path (find-system-path 'home-dir))
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(define program-path (build-path home-directory-path program-name-dotted))
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(define correct-permissions 420) ;; -rw-r--r-- permissions
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(define message-prefix "> ")
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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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;; ------------------------------------------------
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;; messages
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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-add (list (format "Error: No arguments were found after the '~a' command." add-command)
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(format "Suggestion: Try using a quoted argument after the '~a' command." ls-command)
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(format "Example: ~a add \"Go for a walk\"" program-name))
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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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'item-not-found (list "Error: Item not found."
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(format "Suggestion: Try using the '~a' command to see which number " ls-command)
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" correlates to which message in your list."
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(format "Example: ~a ~a" program-name ls-command))
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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-rm (list (format "Error: No arguments were found after the '~a' command." rm-command)
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(format "Suggestion: Try using a number after the '~a' command." rm-command)
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(format "Example: ~a ~a 2" program-name rm-command)
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""
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(format "Note: You may need to run the '~a' command to see which " ls-command)
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" number correlates to which item in your list."
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(format "Example: ~a ~a" program-name ls-command))
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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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'error-usage (list "Error: Incorrect usage."
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(format "Suggestions: Try running the '~a' command." help-command)
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(format "Example: ~a ~a" program-name help-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-ls (list (format "Error: Found arguments after the '~a' command." ls-command)
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(format "Suggestions: Try using '~a' without any arguments." ls-command)
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(format "Example: ~a ~a" program-name ls-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-fake-file (list (format "Error: A '~a' directory was found in your home directory." program-name-dotted)
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(format "Suggestion 1: Move the '~a' directory out of your " program-name-dotted)
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(format " home directory before using ~a." program-name)
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(format "Suggestion 2: Rename the '~a' directory before using ~a." program-name-dotted program-name))
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'error-item-not-found
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"Error: Item not found."
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'error-permissions-prompt (list (format "Error: '~a''s permissions are incorrect." program-path)
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"Would you like to fix them? [y/n]")
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'cancel-creation (list (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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'permissions-fixed (list (format "'~a''s permissions were successfully fixed." 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 (list (format "'~a' was successfully created." 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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'not-found-prompt (list (format "'~a' wasn't found." program-path)
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"Would you like to create it? [y/n]")
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'file-created
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(format "Successfully created ~a." program-path)
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'error-option (list "Error: '~a' is not an option.")
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'empty-list
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"There is nothing in your list."))
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'empty-list (list "There is nothing in your list.")
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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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'added (list "Added '~a' to 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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'removed (list "Removed '~a' from 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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;; ------------------------------------------------
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;; helpers
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;; ------------------------------------------------
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(define (messages-ref key)
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(map (lambda (element) (string-append message-prefix element))
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(hash-ref messages key)))
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(hash-ref messages key))
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(define-syntax-rule (displayln-message-format key string ...)
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(let ([string-to-format (string-join (messages-ref key) "\n")])
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(displayln (format string-to-format string ...))))
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(define (formatees-ref key)
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(hash-ref formatees key))
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(define (displayln-message-list key)
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(let ([listof-strings (messages-ref key)])
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(for ([string listof-strings])
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(displayln string))))
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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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(define (displayln-for . strings)
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(for ([string strings])
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(displayln string)))
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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 (file-has-correct-permissions? file)
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(equal? correct-permissions (file-or-directory-permissions file 'bits)))
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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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;; repair
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;; Check conditions
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;; ------------------------------------------------
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(define (repair/not-an-option user-input)
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(displayln-message-format 'error-option user-input)
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(exit))
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(define (repair/cancel)
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(displayln-message-list 'cancel-creation)
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(exit))
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(define (repair/fake-file)
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(displayln-message-list 'error-fake-file)
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(exit))
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(define (repair/create-exit-mode key)
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(match key
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[(or 'ls 'rm) (exit)]
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['add 'do-nothing]))
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(define (repair/fix-permissions key)
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(file-or-directory-permissions program-path correct-permissions)
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(displayln-message-list 'permissions-fixed)
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(repair/create-exit-mode key))
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(define (repair/wrong-permissions key)
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(displayln-message-list 'error-permissions-prompt)
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(display message-prefix)
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(let ([user-input (read-line)])
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(case (string->symbol user-input)
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['y (repair/fix-permissions key)]
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['n (repair/cancel)]
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[else (repair/not-an-option user-input)])))
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(define (repair/create-file key)
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(close-output-port (open-output-file program-path))
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(file-or-directory-permissions program-path correct-permissions)
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(displayln-message-list 'file-created)
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(repair/create-exit-mode key))
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(define (repair/not-found key)
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(displayln-message-list 'not-found-prompt)
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(display message-prefix)
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(let ([user-input (read-line)])
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(case (string->symbol user-input)
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['y (repair/create-file key)]
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['n (repair/cancel)]
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[else (repair/not-an-option user-input)])))
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(define (repair key)
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(define (check-conditions)
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(cond
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[(directory-exists? program-path)
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(repair/fake-file)]
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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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(repair/not-found key)]
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(begin (displayln-messages-ref 'error-file-doesnt-exist)
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(exit))]
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[(not (file-has-correct-permissions? program-path))
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(repair/wrong-permissions key)]
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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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;; ------------------------------------------------
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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/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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(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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(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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;; ------------------------------------------------
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;; ls
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;; ------------------------------------------------
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(define (ls/display-list listof-items)
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;; add1 starts the listof-numbers at 1 instead of 0
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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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@ -172,87 +186,87 @@
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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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(displayln item))))
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(define (ls)
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(repair '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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(displayln-message-list 'empty-list)
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(displayln-messages-ref 'empty-list)
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(ls/display-list listof-items))))
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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-sub1)
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(let* ([item-to-remove (list-ref listof-items item-number-sub1)]
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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-message-format 'removed item-to-remove)))
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(displayln-formatees-ref 'removed item-to-remove)))
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(define (rm string)
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(repair 'rm)
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(define (rm/process-string string)
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(let* ([listof-items (file->lines program-path)]
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;; subtract 1 because the index starts at
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;; 0 under the hood, but the numbers presented from 'ls'
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;; start at 1.
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[item-number (string->number string)]
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[item-number-sub1 (sub1 item-number)]
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[list-length (length listof-items)])
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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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(if (and (not (null? listof-items))
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(number? item-number)
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(positive? item-number)
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;; 1 less than length, because we want to
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;; remove the index number, which is one less
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;; than the item the user chose
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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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;; We have a list length of 3:
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;; '(1 2 3)
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;; `list-ref` in rm/remove-item above
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;; uses an index that starts at 0, so
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;; the index of the numbers above are:
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;; '(0 1 2)
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;; The 2 is the last index number in a
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;; list of length 3, which is what we
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;; want, because if you try to remove
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;; an index larger than 2, such as the
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;; list length 3, then that would be
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;; an error
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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-message-list 'item-not-found))))
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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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;; ------------------------------------------------
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;; add
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;; ------------------------------------------------
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;; The string-cleaned and -remade is incase there
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;; are multiple newline characters. This ensures
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;; there is only one newline character.
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(define (add string)
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(repair 'add)
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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-message-format 'added string-no-newline)))
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(displayln-formatees-ref 'added string-no-newline)))
|
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|
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;; ------------------------------------------------
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;; random message
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;; ------------------------------------------------
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(define (random-message/append-nicethings-file home-directory)
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(build-path home-directory program-name-dotted))
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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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|
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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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[listof-homes (directory-list root-home #:build? #t)]
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[paths-to-nicethings (map random-message/append-nicethings-file listof-homes)]
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[directories-with-nicethings (filter file-exists? paths-to-nicethings)]
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[directories-with-420 (filter file-has-correct-permissions? directories-with-nicethings)]
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[listof-nicethings (apply append (map file->lines directories-with-420))]
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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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(when (not (zero? list-length))
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(let* ([random-number (random list-length)]
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|
|
@ -263,40 +277,63 @@
|
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;; help
|
||||
;; ------------------------------------------------
|
||||
(define (help)
|
||||
(displayln-for
|
||||
"Usage:"
|
||||
(format " ~a [<command>] [<args>]" program-name)
|
||||
""
|
||||
"Commands:"
|
||||
(format " ~a - Adds an item to your list." add-command)
|
||||
(format " ~a - Prints a numbered list of your items." ls-command)
|
||||
(format " ~a - Removes an item from your list." rm-command)
|
||||
""
|
||||
"Examples:"
|
||||
(format " ~a ~a \"You are beautiful\"" program-name add-command)
|
||||
(format " ~a ~a" program-name ls-command)
|
||||
(format " ~a ~a 2" program-name rm-command)))
|
||||
(displayln
|
||||
(string-append
|
||||
"Usage:" newline
|
||||
(format " ~a [<command>] [<args>]" program-name)
|
||||
double-newline
|
||||
|
||||
"Commands:" newline
|
||||
" No command - Displays a random nicething from a random user." newline
|
||||
(format " ~a - Creates a file in ~a, which allows you to contribute to the town-wide list of nicethings."
|
||||
init-command
|
||||
program-path) newline
|
||||
(format " ~a - Adds a nicething to your list." add-command) newline
|
||||
(format " ~a - Prints a numbered list of the nicethings you've added." ls-command) newline
|
||||
(format " ~a - Removes a nicething from your list." rm-command)
|
||||
double-newline
|
||||
|
||||
"Examples:" newline
|
||||
(format " ~a" program-name) newline
|
||||
(format " ~a ~a" program-name init-command) newline
|
||||
(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)
|
||||
(define (args-ref number)
|
||||
(vector-ref vectorof-args number))
|
||||
(match vectorof-args
|
||||
;; Proper usage
|
||||
[(or '#("-h")
|
||||
'#("--help")
|
||||
'#("help")) (help)]
|
||||
[(vector "add" _) (add (args-ref 1))]
|
||||
[(vector "rm" _) (rm (args-ref 1))]
|
||||
[(vector "ls") (ls)]
|
||||
[(vector) (random-message)]
|
||||
;; Improper usage
|
||||
;; This is checked so we can give the user hints on how to
|
||||
;; use the software if they have part of the command
|
||||
;; correct
|
||||
[(vector "ls" _) (displayln-message-list 'error-ls)]
|
||||
[(vector "add") (displayln-message-list 'error-add)]
|
||||
[(vector "rm") (displayln-message-list 'error-rm)]
|
||||
[(vector _ ...) (displayln-message-list 'error-usage)]))
|
||||
[(vector a)
|
||||
(cond
|
||||
[(ormap (lambda (x) (equal? a x))
|
||||
(list help-command-1
|
||||
help-command-2
|
||||
help-command-3))
|
||||
(help)]
|
||||
|
||||
[(equal? a ls-command)
|
||||
(ls)]
|
||||
|
||||
[(equal? a init-command)
|
||||
(init)]
|
||||
|
||||
[else (displayln-messages-ref 'error-incorrect-usage)])]
|
||||
|
||||
[(vector a _)
|
||||
(cond
|
||||
[(equal? a add-command)
|
||||
(add (args-ref 1))]
|
||||
|
||||
[(equal? a rm-command)
|
||||
(rm (args-ref 1))]
|
||||
|
||||
[else (displayln-messages-ref 'error-incorrect-usage)])]
|
||||
|
||||
[(vector _ _ _ ...)
|
||||
(displayln-messages-ref 'error-too-many-arguments)]
|
||||
|
||||
[_ (random-message)]))
|
||||
|
||||
(define (main vectorof-args)
|
||||
(process-args vectorof-args))
|
||||
|
|
|
|||
Loading…
Reference in New Issue