clone url: git://git.m455.casa/rodo
src/rodo.rkt
| 1 | #lang racket/base |
| 2 | |
| 3 | (require racket/file |
| 4 | racket/list |
| 5 | racket/match |
| 6 | racket/string) |
| 7 | |
| 8 | ;; ------------------------------------------------ |
| 9 | ;; Constants |
| 10 | ;; ------------------------------------------------ |
| 11 | (define command-help-1 "help") |
| 12 | (define command-help-2 "--help") |
| 13 | (define command-help-3 "-h") |
| 14 | (define command-init "init") |
| 15 | (define command-ls "ls") |
| 16 | (define command-rm "rm") |
| 17 | (define command-add "add") |
| 18 | (define command-update "update") |
| 19 | (define program-name "rodo") |
| 20 | (define program-file (string-append "." program-name)) |
| 21 | (define program-path (path->string (build-path (find-system-path 'home-dir) program-file))) |
| 22 | (define newline "\n") |
| 23 | (define double-newline "\n\n") |
| 24 | |
| 25 | ;; ------------------------------------------------ |
| 26 | ;; Messages |
| 27 | ;; ------------------------------------------------ |
| 28 | (define messages |
| 29 | (hash 'error-too-many-arguments |
| 30 | (format (string-append "Error: Too many arguments." newline |
| 31 | "Try running '~a ~a' for more information.") |
| 32 | program-name |
| 33 | command-help-1) |
| 34 | |
| 35 | 'error-incorrect-usage |
| 36 | (format (string-append "Error: Incorrect usage." newline |
| 37 | "Try running '~a ~a' for more information.") |
| 38 | program-name |
| 39 | command-help-1) |
| 40 | |
| 41 | 'error-couldnt-find-file |
| 42 | (format (string-append "Error: Couldn't find ~a" newline |
| 43 | "If the file doesn't exist, try running ~a ~a") |
| 44 | program-path |
| 45 | program-name |
| 46 | command-init) |
| 47 | |
| 48 | 'error-something-exists |
| 49 | (format "Error: It looks like ~a already exists." program-path) |
| 50 | |
| 51 | 'error-file-doesnt-exist |
| 52 | (format (string-append "Error: '~a' doesn't exist." newline |
| 53 | "Try running '~a ~a'.") |
| 54 | program-path |
| 55 | program-name |
| 56 | command-init) |
| 57 | |
| 58 | 'error-item-not-found |
| 59 | "Error: Item not found." |
| 60 | |
| 61 | 'error-not-an-option |
| 62 | "Error: Not an option." |
| 63 | |
| 64 | 'error-not-a-number |
| 65 | "Error: Not a number." |
| 66 | |
| 67 | 'init-cancelled |
| 68 | (format "Cancelled the creation of '~a'." program-path) |
| 69 | |
| 70 | 'init-prompt |
| 71 | (format (string-append "The file '~a' will be created." newline |
| 72 | "Is this okay? [y/n]") |
| 73 | program-path) |
| 74 | |
| 75 | 'file-created |
| 76 | (format "Successfully created ~a." program-path) |
| 77 | |
| 78 | 'empty-list |
| 79 | "There is nothing in your list." |
| 80 | |
| 81 | 'updated-item |
| 82 | "Updated item number ~a." |
| 83 | |
| 84 | 'added |
| 85 | "Added '~a' to your list." |
| 86 | |
| 87 | 'removed |
| 88 | "Removed '~a' from your list.")) |
| 89 | |
| 90 | ;; ------------------------------------------------ |
| 91 | ;; helpers |
| 92 | ;; ------------------------------------------------ |
| 93 | (define (messages-ref key) |
| 94 | (hash-ref messages key)) |
| 95 | |
| 96 | (define (displayln-messages-ref key) |
| 97 | (displayln (messages-ref key))) |
| 98 | |
| 99 | (define (displayln-format-messages-ref key value) |
| 100 | (displayln (format (messages-ref key) value))) |
| 101 | |
| 102 | (define (create-file string) |
| 103 | (close-output-port (open-output-file string))) |
| 104 | |
| 105 | ;; ------------------------------------------------ |
| 106 | ;; init |
| 107 | ;; ------------------------------------------------ |
| 108 | (define (init/cancel) |
| 109 | (displayln-messages-ref 'init-cancelled) |
| 110 | (exit)) |
| 111 | |
| 112 | (define (init/create-file) |
| 113 | (create-file program-path) |
| 114 | (displayln-messages-ref 'file-created)) |
| 115 | |
| 116 | (define (init/prompt) |
| 117 | (displayln-messages-ref 'init-prompt) |
| 118 | (display "> ") |
| 119 | (let ([input-symbol (string->symbol (read-line))]) |
| 120 | (case input-symbol |
| 121 | ['y (init/create-file)] |
| 122 | ['n (init/cancel)] |
| 123 | [else (displayln-messages-ref 'error-not-an-option)]))) |
| 124 | |
| 125 | (define (init) |
| 126 | (if (or (file-exists? program-path) |
| 127 | (directory-exists? program-path)) |
| 128 | (displayln-messages-ref 'error-something-exists) |
| 129 | (init/prompt))) |
| 130 | |
| 131 | ;; ------------------------------------------------ |
| 132 | ;; ls |
| 133 | ;; ------------------------------------------------ |
| 134 | (define (ls/display-list listof-items) |
| 135 | (let* ([numbers (map number->string (range (length listof-items)))] |
| 136 | [numbered-items (map (lambda (a b) (string-append a ". " b)) |
| 137 | numbers |
| 138 | listof-items)]) |
| 139 | (for ([item numbered-items]) |
| 140 | (displayln item)))) |
| 141 | |
| 142 | (define (ls) |
| 143 | (if (file-exists? program-path) |
| 144 | (let ([listof-items (file->lines program-path)]) |
| 145 | (if (null? listof-items) |
| 146 | (displayln-messages-ref 'empty-list) |
| 147 | (ls/display-list listof-items))) |
| 148 | (displayln-messages-ref 'error-couldnt-find-file))) |
| 149 | |
| 150 | ;; ------------------------------------------------ |
| 151 | ;; rm |
| 152 | ;; ------------------------------------------------ |
| 153 | (define (rm/remove-item item-number) |
| 154 | (let ([listof-items (file->lines program-path)]) |
| 155 | (if (and (not (null? listof-items)) |
| 156 | (exact? item-number) |
| 157 | (>= item-number 0) |
| 158 | (< item-number (length listof-items))) |
| 159 | (let* ([item-to-remove (list-ref listof-items item-number)] |
| 160 | [list-without-item (remove item-to-remove listof-items)]) |
| 161 | (display-lines-to-file list-without-item program-path #:exists 'truncate) |
| 162 | (displayln-format-messages-ref 'removed item-to-remove)) |
| 163 | (displayln-messages-ref 'error-item-not-found)))) |
| 164 | |
| 165 | (define (rm arg) |
| 166 | (if (file-exists? program-path) |
| 167 | (let ([item-number (string->number arg)]) |
| 168 | (if item-number |
| 169 | (rm/remove-item item-number) |
| 170 | (displayln-format-messages-ref 'error-not-a-number arg))) |
| 171 | (displayln-messages-ref 'error-couldnt-find-file))) |
| 172 | |
| 173 | ;; ------------------------------------------------ |
| 174 | ;; add |
| 175 | ;; ------------------------------------------------ |
| 176 | (define (add item) |
| 177 | (if (file-exists? program-path) |
| 178 | ;; The removing and adding of the '\n' is to |
| 179 | ;; ensure only one '\n' exists at the end of the |
| 180 | ;; item to be added. |
| 181 | (let* ([item-no-newline (string-replace item "\n" "")] |
| 182 | [item-newline (string-append item-no-newline "\n")]) |
| 183 | (display-to-file item-newline program-path #:exists 'append) |
| 184 | (displayln-format-messages-ref 'added item-no-newline)) |
| 185 | (displayln-messages-ref 'error-couldnt-find-file))) |
| 186 | |
| 187 | (define (update/update-item n item-index text) |
| 188 | (let ([item-list (file->lines program-path)]) |
| 189 | (if (and (not (null? item-list)) |
| 190 | (>= item-index 0) |
| 191 | (exact? item-index) |
| 192 | (< item-index (length item-list))) |
| 193 | (begin (display-lines-to-file (list-set item-list item-index text) |
| 194 | program-path |
| 195 | #:exists 'truncate) |
| 196 | (displayln-format-messages-ref 'updated-item n)) |
| 197 | (displayln-messages-ref 'error-item-not-found)))) |
| 198 | |
| 199 | (define (update n text) |
| 200 | (if (file-exists? program-path) |
| 201 | (let ([item-index (string->number n)]) |
| 202 | (if item-index |
| 203 | (update/update-item n item-index text) |
| 204 | (displayln-messages-ref 'error-not-a-number))) |
| 205 | (displayln-messages-ref 'error-couldnt-find-file))) |
| 206 | |
| 207 | ;; ------------------------------------------------ |
| 208 | ;; help |
| 209 | ;; ------------------------------------------------ |
| 210 | (define (help) |
| 211 | (displayln |
| 212 | (string-append |
| 213 | "Usage:" newline |
| 214 | (format " ~a [<command>] [<args>]" program-name) |
| 215 | double-newline |
| 216 | |
| 217 | "Commands:" newline |
| 218 | (format " ~a - Creates a file in ~a, where your items will be stored." |
| 219 | command-init |
| 220 | program-path) newline |
| 221 | (format " ~a - Adds an item to your list." command-add) newline |
| 222 | (format " ~a - Prints a numbered list of the items you've added." command-ls) newline |
| 223 | (format " ~a - Removes an item from your list." command-rm) newline |
| 224 | (format " ~a - Replaces the contents of an item with new text." command-update) |
| 225 | double-newline |
| 226 | |
| 227 | "Examples:" newline |
| 228 | (format " ~a" program-name) newline |
| 229 | (format " ~a ~a" program-name command-init) newline |
| 230 | (format " ~a ~a \"You are wonderful\"" program-name command-add) newline |
| 231 | (format " ~a ~a" program-name command-ls) newline |
| 232 | (format " ~a ~a 2" program-name command-rm) newline |
| 233 | (format " ~a ~a 2 \"This is new text!\"" program-name command-update)))) |
| 234 | |
| 235 | (define (process-args vectorof-args) |
| 236 | (match vectorof-args |
| 237 | [(vector (== command-update) n text) (update n text)] |
| 238 | [(vector (== command-add) a) (add a)] |
| 239 | [(vector (== command-rm) a) (rm a)] |
| 240 | [(vector (== command-ls)) (ls)] |
| 241 | [(vector (== command-init)) (init)] |
| 242 | [(or (vector (== command-help-1)) |
| 243 | (vector (== command-help-2)) |
| 244 | (vector (== command-help-3))) (help)] |
| 245 | [_ (displayln-messages-ref 'error-incorrect-usage)])) |
| 246 | |
| 247 | (define (main vectorof-args) |
| 248 | (process-args vectorof-args)) |
| 249 | |
| 250 | (main (current-command-line-arguments)) |