pico8.el

   1 ;;; pico8.el --- major mode for editing PICO-8 cartridges
   2 ;;
   3 ;; Author: Joe Wreschnig <joe.wreschnig@gmail.com>
   4 ;; Package-Version: 20170620
   5 ;; Package-Requires: ((emacs "25") (polymode "20170307") (lua-mode "20151025"))
   6 ;; URL: https://git.korewanetadesu.com/pico8.git
   7 ;; Keywords: convenience
   8 ;;
   9 ;; This program is free software; you can redistribute it and/or
  10 ;; modify it under the terms of the GNU General Public License
  11 ;; as published by the Free Software Foundation; either version 3
  12 ;; of the License, or (at your option) any later version.
  13
  14 ;;; Commentary:
  15 ;;
  16 ;; This mode (ab)uses polymode to fit six modes into one buffer, one
  17 ;; of which is "real Lua" text and the other five of which have
  18 ;; diverse strict formatting requirements.
  19 ;;
  20 ;; It provides keybindings and commands for inter-mode actions.
  21
  22 ;;; Code:
  23
  24 (require 'polymode)
  25 (require 'lua-mode)
  26 (require 'thingatpt)
  27
  28
  29 (defgroup pico8 nil
  30   "Support for PICO-8 (.p8) cartridge files."
  31   :tag "PICO-8"
  32   :group 'languages)
  33
  34 (defgroup pico8-faces nil
  35   "Faces for PICO-8 (.p8) cartridge files."
  36   :tag "PICO-8 Faces"
  37   :group 'pico8)
  38
  39 (defcustom pico8-executable-paths
  40   '("/Applications/PICO-8.app/Contents/MacOS/pico8" ; macOS
  41     "/usr/lib/pico8/pico8" ; PocketCHIP
  42     "pico8") ; Normal systems
  43   "The locations to search for the PICO-8 executable."
  44   :group 'pico8
  45   :tag "PICO-8 Executable Paths"
  46   :type '(repeat string))
  47
  48 (defcustom pico8-preserve-output-on-exit nil
  49   "Whether to keep the output buffer when PICO-8 exits.
  50
  51 PICO-8 processes are long-lived with little surprising output, so
  52 their output buffers are killed by default when they exit.
  53 However, this is not usual behavior in Emacs, and can be
  54 disabled by setting this to t."
  55   :group 'pico8
  56   :tag "Preserve PICO-8 Output On Exit"
  57   :type 'boolean)
  58
  59 (defcustom pico8-lua-indent-level 1
  60   "Default indentation for PICO-8 Lua mode.
  61
  62 This overrides `lua-indent-level' in `pico8-lua-mode'.
  63 `lua-mode''s default indentation is 3, which is both
  64 idiosyncratic and quite large when viewed in the PICO-8 editor,
  65 where the convention is 1."
  66   :group 'pico8
  67   :tag "PICO-8 Lua Indent Level")
  68
  69 (defconst pico8-colors
  70   (mapcar #'symbol-value
  71           (list (defconst pico8-color-0 "#000000")
  72                 (defconst pico8-color-1 "#1D2B53")
  73                 (defconst pico8-color-2 "#7E2553")
  74                 (defconst pico8-color-3 "#008751")
  75                 (defconst pico8-color-4 "#AB5236")
  76                 (defconst pico8-color-5 "#5F574F")
  77                 (defconst pico8-color-6 "#C2C3C7")
  78                 (defconst pico8-color-7 "#FFF1E8")
  79                 (defconst pico8-color-8 "#FF004D")
  80                 (defconst pico8-color-9 "#FFA300")
  81                 (defconst pico8-color-a "#FFEC27")
  82                 (defconst pico8-color-b "#00E436")
  83                 (defconst pico8-color-c "#29ADFF")
  84                 (defconst pico8-color-d "#83769C")
  85                 (defconst pico8-color-e "#FF77A8")
  86                 (defconst pico8-color-f "#FFCCAA"))))
  87
  88 (defconst pico8-data-characters
  89   (append "0123456789abcdef" nil))
  90
  91 (defface pico8-data-face
  92   '((t (:inherit fixed-pitch)))
  93   "Face for PICO-8 binary data."
  94   :group 'pico8-faces)
  95
  96 (define-derived-mode pico8-data-mode fundamental-mode
  97   "PICO-8 Data"
  98   "Major mode for non-text PICO-8 cartridge sections.
  99
 100 This is an 'abstract' mode and should not be used
 101 as an actual major mode, only to derive new modes.")
 102
 103 (defun pico8-data-self-insert-command (n)
 104   "Insert the data character you type N times.
 105
 106 PICO-8 cartridges represent binary data using fixed-length
 107 strings of 0-f, one character per nybble.  This command will only
 108 insert the typed character if it is one of these characters,
 109 overwriting one of these characters."
 110   (interactive "P")
 111   (when (memq (char-after) pico8-data-characters)
 112     (let ((overwrite-mode 'overwrite-mode-textual))
 113       (self-insert-command (prefix-numeric-value n)))))
 114
 115 (let ((map pico8-data-mode-map))
 116   (suppress-keymap map)
 117   (dolist (c (mapcar #'char-to-string pico8-data-characters))
 118     (define-key map c 'pico8-data-self-insert-command)))
 119
 120 (defun pico8-goto-char (position)
 121   "Set point to POSITION, a number.
 122
 123 The position is global to the cartridge, and the buffer is
 124 widened if necessary to reach it."
 125   (unless (<= (point-min) position (point-max))
 126     (widen))
 127   (goto-char position))
 128 \f
 129 (defun pico8-executable ()
 130   "Look up the PICO-8 executable."
 131   (or (car (delete nil (mapcar 'executable-find pico8-executable-paths)))
 132       (error "The PICO-8 executable could not be found.
 133 Make sure it is installed, and present in `pico8-executable-paths'")))
 134
 135 (defun pico8--create-output-buffer ()
 136   "Create and return a buffer for PICO-8 output."
 137   (let* ((output-name (generate-new-buffer-name "*PICO-8*"))
 138          (output (get-buffer-create output-name)))
 139     (display-buffer output)
 140     (with-current-buffer output
 141       (insert "(Use C-r within PICO-8 to reload changes from Emacs.)\n")
 142       ;; Setting the point in the buffer doesn't have a lasting
 143       ;; effect, we need to change it in the window it opened in.
 144       ;; https://emacs.stackexchange.com/questions/21464/
 145       (set-window-point (get-buffer-window output) (point-max))
 146       (compilation-mode))
 147     output))
 148
 149 (defun pico8--process-sentinel (process signal)
 150   "Delete buffers and windows for PROCESS if SIGNAL is exit."
 151   (when (and (not pico8-preserve-output-on-exit)
 152              (process-buffer process)
 153              (memq (process-status process) '(exit signal)))
 154     (let ((buffer (process-buffer process)))
 155       (dolist (window (get-buffer-window-list buffer))
 156         (quit-restore-window window))
 157       (kill-buffer buffer))))
 158
 159 (defun pico8--execute (&rest params)
 160   "Run PICO-8 with the provided PARAMS after saving etc."
 161   (let ((pico8 (pico8-executable))
 162         (cartridge-file-name (buffer-file-name (buffer-base-buffer))))
 163     (when (and (buffer-modified-p)
 164                (y-or-n-p (format "Save %s? " cartridge-file-name)))
 165       (save-buffer))
 166     (let* ((output (pico8--create-output-buffer))
 167            (process-args (append params (list cartridge-file-name)))
 168            (process (apply #'start-file-process "PICO-8" output pico8
 169                            process-args)))
 170       (set-process-sentinel process 'pico8--process-sentinel))))
 171
 172 (defun pico8-run-cartridge ()
 173   "Run the current PICO-8 cartridge."
 174   (interactive)
 175   (pico8--execute "-run"))
 176
 177 (defun pico8-load-cartridge ()
 178   "Load the current cartridge in PICO-8."
 179   (interactive)
 180   (pico8--execute))
 181
 182
 183 (defun pico8-cartridge-section-header (name)
 184   "Return the header string for cartridge section NAME."
 185   (format "__%s__" name))
 186
 187 (defconst pico8-cartridge-sections
 188   '("lua" "gfx" "gff" "map" "sfx" "music"))
 189
 190 (defconst pico8-cartridge-keywords
 191   (mapcar #'pico8-cartridge-section-header pico8-cartridge-sections))
 192
 193 (defconst pico8-cartridge-header
 194   "pico-8 cartridge // http://www.pico-8.com\nversion [0-9]+")
 195
 196 (define-derived-mode pico8-cartridge-mode fundamental-mode
 197   "Cartridge"
 198   "Major mode for showing PICO-8 cartridge structure."
 199   (font-lock-add-keywords
 200    nil (list (regexp-opt pico8-cartridge-keywords 'symbols)
 201              (cons pico8-cartridge-header font-lock-comment-face)))
 202   (suppress-keymap pico8-cartridge-mode-map))
 203
 204 (defun pico8-cartridge-point-of-section (name)
 205   "Find the point where the data for section NAME begins."
 206   (save-restriction
 207     (widen)
 208     (save-excursion
 209       (goto-char (point-min))
 210       (let ((token (format "^%s\n" (pico8-cartridge-section-header name))))
 211         (if (not (or (re-search-forward token nil t)
 212                      (re-search-forward token nil t)))
 213             (error "Unable to find a %s section in current buffer" name)))
 214       (point))))
 215
 216 (defun pico8-cartridge-goto-section (name)
 217   "Go to the beginning of section NAME."
 218   (interactive "sGoto PICO-8 cartridge section: ")
 219   (pico8-goto-char (pico8-cartridge-point-of-section name)))
 220
 221 (defmacro pico8-cartridge-with-section (section &rest body)
 222   "Go to and narrow SECTION and evaluate BODY there."
 223   `(save-restriction
 224      (save-excursion
 225        (pico8-cartridge-goto-section ,section)
 226        (pm-narrow-to-span)
 227        ,@body)))
 228 \f
 229 (defconst pico8-lua-builtins
 230   (regexp-opt
 231    '("abs" "add" "all" "atan2" "btn" "btnp" "camera"
 232      "cartdata" "circ" "circfill" "clip" "cls" "cocreate"
 233      "coresume" "costatus" "color" "cos" "cstore" "cursor"
 234      "del" "dget" "dset" "fget" "flip" "flr" "folder" "foreach"
 235      "fset" "info" "line" "load" "ls" "map" "max" "memcpy"
 236      "memset" "menuitem" "mget" "mid" "min" "mset" "music"
 237      "pairs" "pal" "palt" "peek" "pget" "poke" "print"
 238      "printh" "pset" "reboot" "rect" "rectfill" "reload"
 239      "resume" "rnd" "run" "save" "sfx" "sget" "sin" "spr"
 240      "sqrt" "srand" "sset" "sspr" "stat") 'symbols))
 241
 242 (define-derived-mode pico8-lua-mode lua-mode
 243   "Lua"
 244   "Major mode for editing Lua code in PICO-8 cartridges."
 245   (font-lock-add-keywords
 246    nil `((,pico8-lua-builtins . font-lock-builtin-face)))
 247   (set (make-local-variable 'lua-indent-level) pico8-lua-indent-level))
 248
 249 \f
 250 (defun pico8-gff-current-position ()
 251   "Calculate the flag position of the cursor."
 252   (pm-with-narrowed-to-span (pm-get-innermost-span)
 253     (let ((row (1- (line-number-at-pos)))
 254           (col (min 255 (current-column))))
 255       (+ (/ col 2) (* row 128)))))
 256
 257 (defun pico8-gff-lighter ()
 258   "Calculate the flag under the cursor."
 259   (pm-with-narrowed-to-span (pm-get-innermost-span)
 260     (let ((row (1- (line-number-at-pos)))
 261           (col (current-column)))
 262       (+ (* 128 row) (/ col 2)))))
 263
 264 (define-derived-mode pico8-gff-mode pico8-data-mode
 265   '(:eval (format "Flag[%d]" (pico8-gff-lighter)))
 266   "Major mode for editing flags in PICO-8 cartridges.")
 267
 268 (defun pico8-gff-offset-of-flag (flag)
 269   "Calculate the offset of of flag number FLAG."
 270   (unless (<= 0 flag 255)
 271     (error "Valid flag numbers are 0 to 255, inclusive"))
 272   (+ (* 2 flag) (if (> flag 128) 1 0)))
 273 \f
 274 (defgroup pico8-pixel-faces nil
 275   "Font faces to use for PICO-8 pixels.
 276
 277 Rather than customizing each directly, you'll probably just want
 278 to change `pico8-pixel-face'."
 279   :tag "PICO-8 Pixel Faces"
 280   :group 'pico8-faces)
 281
 282 (defface pico8-pixel-face
 283   '((t (:inherit pico8-data-face :height 100)))
 284   "Face for PICO-8 sprite 'pixels'."
 285   :group 'pico8-faces)
 286
 287 (dotimes (i (length pico8-colors))
 288   (let ((c (nth i pico8-colors)))
 289     (eval `(defface ,(intern (format "pico8-pixel-%x" i))
 290              '((t (:inherit pico8-pixel-face :foreground ,c)))
 291              ,(format "Face for PICO-8 sprite 'pixel' %x" i)
 292              :group 'pico8-pixel-faces
 293              :tag ,(format "Face for PICO-8 sprite 'pixel' %x." i)))))
 294
 295 (defconst pico8-gfx-font-lock-keywords
 296   `(("0+" . 'pico8-pixel-0)
 297     ("1+" . 'pico8-pixel-1)
 298     ("2+" . 'pico8-pixel-2)
 299     ("3+" . 'pico8-pixel-3)
 300     ("4+" . 'pico8-pixel-4)
 301     ("5+" . 'pico8-pixel-5)
 302     ("6+" . 'pico8-pixel-6)
 303     ("7+" . 'pico8-pixel-7)
 304     ("8+" . 'pico8-pixel-8)
 305     ("9+" . 'pico8-pixel-9)
 306     ("a+" . 'pico8-pixel-a)
 307     ("b+" . 'pico8-pixel-b)
 308     ("c+" . 'pico8-pixel-c)
 309     ("d+" . 'pico8-pixel-d)
 310     ("e+" . 'pico8-pixel-e)
 311     ("f+" . 'pico8-pixel-f)
 312
 313     ;; If the \n isn't in the smaller face the line is taller to
 314     ;; accommodate the full sized point at the end-of-line.
 315     ("\n" . 'pico8-pixel-0)))
 316
 317 (defun pico8-gfx-current-position ()
 318   "Calculate the sprite and in-sprite position of the cursor."
 319   ;; FIXME: Ensure the span we got was actually the gfx one.
 320   (pm-with-narrowed-to-span (pm-get-innermost-span)
 321     (let ((row (1- (line-number-at-pos)))
 322           (col (min 127 (current-column))))
 323       (list (+ (* 16 (/ row 8)) (/ col 8))
 324             (% col 8) (% row 8)))))
 325
 326 (defun pico8-forward-sprite (n)
 327   "Move the point N sprites forward (backward if N is negative)."
 328   (interactive "P")
 329   (let* ((n (prefix-numeric-value n))
 330         (current (pico8-gfx-current-position))
 331         (offset (pico8-gfx-offset-of-sprite
 332                  (% (+ 256 n (nth 0 current)) 256)
 333                  (nth 1 current)
 334                  (nth 2 current))))
 335     (pm-with-narrowed-to-span (pm-get-innermost-span)
 336       (goto-char (+ (point-min) offset)))))
 337
 338 (defun pico8-backward-sprite (n)
 339   "Move the point N sprites backward (forward if N is negative)."
 340   (interactive "P")
 341   (pico8-forward-sprite (- (prefix-numeric-value n))))
 342
 343 (defun pico8-gfx-lighter ()
 344   "Show a short description of the current sprite position."
 345   (let ((current (pico8-gfx-current-position)))
 346     (if current (apply #'format (cons "Sprite[%d:%d,%d]" current))
 347       "Sprite[-]")))
 348
 349 (define-derived-mode pico8-gfx-mode pico8-data-mode
 350   '(:eval (pico8-gfx-lighter))
 351   "Major mode for editing sprites in PICO-8 cartridges."
 352   (font-lock-add-keywords nil pico8-gfx-font-lock-keywords)
 353   (read-only-mode t))
 354
 355 (defun pico8-gfx-offset-of-sprite (sprite &optional x y)
 356   "Calculate the point of SPRITE's X,Y pixel (0,0 by default)."
 357   (let ((x (or x 0))
 358         (y (or y 0))
 359         (line (* (/ sprite 16) 8))
 360         (row (* (% sprite 16) 8)))
 361     ;; A limit of 4x4 is kind of arbitrary but if you're using sprites
 362     ;; larger than that you probably aren't going to be doing so in a
 363     ;; way that this command is useful anyway.
 364     (unless (and (<= 0 x 31) (<= 0 y 31))
 365         (error "Valid sprite offsets are 0 to 31, inclusive"))
 366     (unless (<= 0 sprite 255)
 367         (error "Valid sprite numbers are 0 to 255, inclusive"))
 368     (+ (* 129 (+ y line)) row x)))
 369
 370 (define-key pico8-gfx-mode-map "q" 'pico8-backward-sprite)
 371 (define-key pico8-gfx-mode-map "w" 'pico8-forward-sprite)
 372
 373 (defface pico8-map-tile-face
 374   '((t (:inherit pico8-data-face :height 100)))
 375   "Face for PICO-8 map 'tiles'."
 376   :group 'pico8-faces)
 377
 378 (defconst pico8-map-font-lock-keywords
 379   '(("[0-9a-f]+" . 'pico8-map-tile-face)
 380     ("\n" . 'pico8-map-tile-face)))
 381
 382 (defun pico8-map-lighter ()
 383   "Calculate the map tile under the cursor."
 384   (pm-with-narrowed-to-span (pm-get-innermost-span)
 385     (let ((row (- (line-number-at-pos) 1))
 386           (col (current-column)))
 387       ;; TODO: Show sprite number and flags value
 388       (format "%d,%d" (/ col 2) row))))
 389
 390 (define-derived-mode pico8-map-mode pico8-data-mode
 391   '(:eval (format "Map[%s]" (pico8-map-lighter)))
 392   "Major mode for editing map data in PICO-8 cartridges."
 393   (setq font-lock-defaults '(pico8-map-font-lock-keywords)))
 394 \f
 395 (defun pico8-sfx-lighter ()
 396   "Calculate the sound effect under the cursor."
 397   (pm-with-narrowed-to-span (pm-get-innermost-span)
 398     (let ((row (- (line-number-at-pos) 1)))
 399       (format "%d" row))))
 400
 401 (define-derived-mode pico8-sfx-mode pico8-data-mode
 402   '(:eval (format "Sound[%s]" (pico8-sfx-lighter)))
 403   "Major mode for editing sound data in PICO-8 cartridges.")
 404 \f
 405 (defun pico8-music-lighter ()
 406   "Calculate the map tile under the cursor."
 407   (pm-with-narrowed-to-span (pm-get-innermost-span)
 408     (let ((row (- (line-number-at-pos) 1)))
 409       (format "%d" row))))
 410
 411 (define-derived-mode pico8-music-mode pico8-data-mode
 412   '(:eval (format "Pattern[%s]" (pico8-music-lighter)))
 413   "Major mode for editing music data in PICO-8 cartridges.")
 414 \f
 415 (defun pico8-goto-sprite (sprite &optional x y)
 416   "Set point to the top-left pixel of SPRITE (or the X,Y pixel)."
 417   (interactive "nGo to sprite [0-255]: ")
 418   (let ((base (pico8-cartridge-point-of-section "gfx"))
 419         (offset (pico8-gfx-offset-of-sprite sprite x y)))
 420     (pico8-goto-char (+ base offset))))
 421
 422 (defun pico8-goto-flag (flag)
 423   "Set point to the start of flag number FLAG."
 424   (interactive "nGo to flag [0-255]: ")
 425   (let ((base (pico8-cartridge-point-of-section "gff"))
 426         (offset (pico8-gff-offset-of-flag flag)))
 427     (pico8-goto-char (+ base offset))))
 428
 429 (defun pico8--string-to-number (string)
 430   "Convert STRING to a number, guessing the base.
 431
 432 Returns nil, not 0, if the string was not converted."
 433   (cond ((string-match-p "^0[xX][0-9a-fA-F]+$" string)
 434          (string-to-number (substring string 2) 16))
 435         ((string-match-p "^0[0-9]+$" string)
 436          (string-to-number (substring string 1) 8))
 437         ((string-match-p "^[0-9]+$" string)
 438          (string-to-number string 10))
 439         (t nil)))
 440
 441 (defun pico8-sprite-relevant-to-point ()
 442   "Get the sprite number relevant to the point.
 443
 444 When editing a flag, this is the flag number.  When editing a
 445 map, this is the value at the map.  When editing Lua code,
 446 this is the numeric literal in the code."
 447   (cond
 448    ((derived-mode-p 'pico8-gff-mode) (pico8-gff-current-position))
 449
 450    ;; The sprite for a map is the data at the map location, which is
 451    ;; to say, the hexadecimal interpretation of the two character
 452    ;; string beginning at the previous even column.
 453    ((derived-mode-p 'pico8-map-mode)
 454     (let ((beg (- (point) (% (min 255 (current-column)) 2))))
 455       (string-to-number (buffer-substring beg (+ beg 2)) 16)))
 456
 457    ;; In Lua, the sprite is a numeric literal.
 458    ((derived-mode-p 'lua-mode)
 459     (pico8--string-to-number (or (word-at-point) "")))
 460
 461    (t nil)))
 462
 463
 464 (defun pico8-goto-sprite-relevant-to-point ()
 465   "Go to the sprite number relevant to the text at the point.
 466
 467 When editing a flag, this is the flag number.  When editing a
 468 map, this is the value at the map.  When editing Lua code,
 469 this is the numeric literal in the code."
 470   (interactive)
 471   (let ((sprite (pico8-sprite-relevant-to-point)))
 472     (if sprite (pico8-goto-sprite sprite)
 473       (error "No sprite number was found at the point"))))
 474
 475
 476 (defun pico8-goto-thing-relevant-to-point ()
 477   "Go to the thing relevant to the text at the point.
 478
 479 When editing a flag or map, this is the corresponding sprite.
 480 When editing a sprite, this is the corresponding flag.  When
 481 editing Lua code, how lucky are you feeling?
 482
 483 This function needs a lot of work.."
 484   (interactive)
 485   (cond ((derived-mode-p 'pico8-gfx-mode)
 486          (pico8-goto-flag (car (pico8-gfx-current-position))))
 487
 488         ((or (derived-mode-p 'pico8-gff-mode)
 489              (derived-mode-p 'pico8-map-mode))
 490          (pico8-goto-sprite-relevant-to-point))
 491
 492         ((derived-mode-p 'lua-mode)
 493          (let ((n (or (pico8--string-to-number (word-at-point)) 0))
 494                (c (save-excursion
 495                     (and (re-search-backward "\\<f[gs]et\\|s?spr\\>"
 496                                              (- (point) 30) t)
 497                          (char-after)))))
 498            (cond ((= c ?f) (pico8-goto-flag n))
 499                  ((= c ?s) (pico8-goto-sprite n))
 500                  (t (error "There's nothing obvious to go to")))))
 501
 502         (t (error "There's no obvious thing to go to"))))
 503 \f
 504 ;;;
 505 ;; Flycheck Integration
 506 ;;
 507 ;; This is more or less the same as the default Lua checkers, but we
 508 ;; need to write out a temporary file so it doesn't check the non-Lua
 509 ;; parts of the file.
 510
 511 (defun pico8--lua-only (f &rest args)
 512   "If this is a PICO-8 buffer, run F(ARGS) on only the current section."
 513   (if (derived-mode-p 'pico8-lua-mode)
 514       (pico8-cartridge-with-section "lua"
 515         (let ((mainbuf (current-buffer))
 516               (from (point-min))
 517               (to (point-max)))
 518           (with-temp-buffer
 519             (insert "\n\n\n") ;; match line number with stripped header
 520             (insert-buffer-substring mainbuf from to)
 521             (insert " -- start __gfx__") ;; otherwise last line is ignored
 522             (apply f args))))
 523     (apply f args)))
 524
 525 (defconst pico8--lua-luacheckrc
 526   (expand-file-name
 527    "pico8.luacheckrc"
 528    (file-name-directory (or load-file-name buffer-file-name))))
 529
 530 (eval-when-compile
 531   (require 'flycheck))
 532
 533 (with-eval-after-load 'flycheck
 534   (advice-add 'flycheck-save-buffer-to-file :around #'pico8--lua-only)
 535
 536   (flycheck-define-checker pico8-lua
 537     "A PICO-8 Lua syntax checker using the Lua compiler.
 538 See URL `http://www.lua.org/'."
 539     :command ("luac" "-p" source)
 540     :standard-input nil
 541     :error-patterns
 542     ((error line-start
 543             ;; Skip the name of the luac executable.
 544             (minimal-match (zero-or-more not-newline))
 545             ":" line ": " (message) line-end))
 546     :modes pico8-lua-mode)
 547
 548   (flycheck-define-checker pico8-luacheck
 549     "A PICO-8 Lua syntax checker using luacheck.
 550 See URL `https://github.com/mpeterv/luacheck'."
 551     :command ("luacheck"
 552               "--formatter" "plain"
 553               "--codes"                   ; Show warning codes
 554               "--no-color"
 555               (option "--config" pico8--lua-luacheckrc)
 556               "--filename" source-original
 557               source)
 558     :error-patterns
 559     ((warning line-start
 560               (optional (file-name))
 561               ":" line ":" column
 562               ": (" (id "W" (one-or-more digit)) ") "
 563               (message) line-end)
 564      (error line-start
 565             (optional (file-name))
 566             ":" line ":" column ":"
 567             ;; `luacheck' before 0.11.0 did not output codes for errors, hence
 568             ;; the ID is optional here
 569             (optional " (" (id "E" (one-or-more digit)) ") ")
 570             (message) line-end))
 571     :modes pico8-lua-mode)
 572
 573   (add-to-list 'flycheck-checkers 'pico8-lua)
 574   (add-to-list 'flycheck-checkers 'pico8-luacheck))
 575
 576
 577 ;;;
 578 ;; Finally - pico8-mode!
 579
 580 (defmacro pico8--defchunkmode (name)
 581   "Define a PICO-8 polymode chunk for section NAME."
 582   `(defconst ,(intern (concat "pico8--pm-inner-" name))
 583      (pm-hbtchunkmode :mode ',(intern (format "pico8-%s-mode" name))
 584                       :head-mode 'host
 585                       :head-reg ,(format "^__%s__\n" name)
 586                       :tail-reg "^__[a-z]\\{3,5\\}__\n\\|^\n\\'")))
 587
 588 (defconst pico8--pm-poly
 589   (pm-polymode-multi
 590    :hostmode
 591    (defconst pico8--pm-host
 592      (pm-bchunkmode :mode 'pico8-cartridge-mode))
 593    :innermodes (list
 594                 (pico8--defchunkmode "lua")
 595                 (pico8--defchunkmode "gfx")
 596                 (pico8--defchunkmode "gff")
 597                 (pico8--defchunkmode "map")
 598                 (pico8--defchunkmode "sfx")
 599                 (pico8--defchunkmode "music"))))
 600
 601 (define-polymode pico8-mode pico8--pm-poly
 602   :lighter "P8"
 603   :keymap '(("\C-c\C-r" . pico8-run-cartridge)
 604             ("\C-c\C-e" . pico8-load-cartridge)
 605             ("\M-gs" . pico8-goto-sprite)
 606             ("\M-gS" . pico8-goto-sprite-relevant-to-point)
 607             ("\M-gf" . pico8-goto-flag)
 608             ("\M-g." . pico8-goto-thing-relevant-to-point))
 609   (toggle-truncate-lines 1))
 610
 611 (add-to-list 'auto-mode-alist '("\\.p8$" . pico8-mode))
 612 (add-to-list 'magic-mode-alist '("pico-8 cartridge" . pico8-mode))
 613
 614
 615 (provide 'pico8)
 616 ;;; pico8.el ends here