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;;; Starling Game Engine
;;; Copyright © 2018 David Thompson <davet@gnu.org>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Starling. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; REPL node for in-engine live hacking.
;;
;;; Code:
(define-module (starling repl)
#:use-module (chickadee data array-list)
#:use-module (chickadee graphics color)
#:use-module (chickadee graphics font)
#:use-module (chickadee graphics path)
#:use-module (chickadee math rect)
#:use-module (chickadee math vector)
#:use-module (chickadee scripting)
#:use-module (ice-9 control)
#:use-module (ice-9 eval-string)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (oop goops)
#:use-module (starling ring-buffer)
#:use-module (starling node)
#:use-module (starling node-2d)
#:use-module (starling scene)
#:export (<repl>
open-repl))
(define-class <repl> (<scene-2d>)
(scene-mux #:getter scene-mux #:init-keyword #:scene-mux)
(overlay-scene #:accessor overlay-scene #:init-keyword #:overlay-scene)
(lines #:accessor lines #:init-form '())
(log-lines #:accessor log-lines)
(user-text #:accessor user-text #:init-form "")
(module #:accessor module #:init-form (resolve-module '(guile-user))))
(define-method (open-repl repl)
(set! (overlay-scene repl) (current-scene (scene-mux repl)))
(push-scene (scene-mux repl) repl))
(define-method (close-repl (repl <repl>))
(pop-scene (scene-mux repl)))
(define-method (modify-user-text (repl <repl>) new-text)
(set! (user-text repl) new-text)
(set! (text (& repl prompt))
(format #f "~s> ~a" (module-name (module repl)) new-text)))
(define-method (backward-delete (repl <repl>))
(let ((text (user-text repl)))
(modify-user-text repl
(substring text 0 (max (- (string-length text) 1) 0)))))
(define-method (print (repl <repl>) s)
(for-each (lambda (line)
(ring-buffer-put! (log-lines repl) line))
(match (string-split s #\newline)
;; Drop trailing newlines
((lines ... "") lines)
(lines lines))))
(define-method (flush-log (repl <repl>))
(let ((log (log-lines repl)))
(let loop ((i 0)
(labels (lines repl)))
(when (< i (ring-buffer-length log))
(match labels
((label . rest)
(set! (text label) (ring-buffer-ref log i))
(loop (+ i 1) rest)))))))
(define-method (print-backtrace (repl <repl>) stack)
(let loop ((i (- (stack-length stack) 1)))
(when (>= i 0)
(let ((frame (stack-ref stack i)))
(match (frame-source frame)
((_ file line . column)
(format #t "~d: In ~a:~% ~d:~d ~a~%"
i file line column
(frame-procedure-name frame)))
(#f
(format #t "~d: In unknown file:~% ~a~%"
i
(frame-procedure-name frame))))
(loop (- i 1))))))
(define-method (eval-user-text (repl <repl>))
(let ((result *unspecified*))
(let/ec cancel
(with-exception-handler
(lambda (exception)
(print repl
(with-output-to-string
(lambda ()
(print-exception (current-output-port) #f
(exception-kind exception)
(exception-args exception))
(newline)
(let ((tag (match (fluid-ref %stacks)
((_ . tag) tag)
(_ 0))))
(print-backtrace repl (make-stack #t 3 tag))))))
(cancel))
(lambda ()
(print repl
(with-output-to-string
(lambda ()
(start-stack 'repl-stack
(set! result
(eval-string (user-text repl)
#:module (module repl))))))))))
result))
(define-method (eval-and-print (repl <repl>))
(print repl (text (& repl prompt)))
(let ((result (eval-user-text repl)))
;;(print repl output)
(unless (unspecified? result)
(print repl (with-output-to-string
(lambda ()
(display "=> ")
(write result)))))
(flush-log repl)
(modify-user-text repl "")))
(define-method (on-boot (repl <repl>))
(let* ((res (resolution (car (cameras repl))))
(font (default-font))
(line-height (font-line-height font))
(left-margin 6.0)
(bottom-margin 6.0)
(nlines (- (inexact->exact
(floor
(/ (vec2-y res) line-height)))
1))
(line-nodes
(map (lambda (i)
(make <label>
#:rank 9
#:font font
#:position (vec2 left-margin
(- (vec2-y res)
(* i line-height)))
#:vertical-align 'top))
(iota nlines))))
(attach-to repl
(make <canvas>
#:painter (with-style ((fill-color (make-color 0 0 0 0.7)))
(fill
(rectangle (vec2 0.0 0.0)
(vec2-x res)
(vec2-y res)))))
(make <label>
#:rank 9
#:name 'prompt
#:position (vec2 left-margin bottom-margin)))
(apply attach-to repl line-nodes)
(set! (lines repl) line-nodes)
(set! (log-lines repl) (make-ring-buffer nlines))
(modify-user-text repl "")))
(define-method (update (repl <repl>) dt)
(update-tree (overlay-scene repl) dt)
(next-method))
(define-method (render (repl <repl>) alpha)
(render-tree (overlay-scene repl) alpha)
(next-method))
(define-method (on-key-press (repl <repl>) key modifiers repeat?)
(match key
('escape (close-repl repl))
('backspace (backward-delete repl))
('return (eval-and-print repl))
(_ #f)))
(define-method (on-text-input (repl <repl>) text)
(modify-user-text repl (string-append (user-text repl) text)))
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