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;;; racket-stepper.el -*- lexical-binding: t; -*-
;; Copyright (c) 2018-2022 by Greg Hendershott.
;; Portions Copyright (C) 1985-1986, 1999-2013 Free Software Foundation, Inc.
;; Author: Greg Hendershott
;; URL: https://github.com/greghendershott/racket-mode
;; SPDX-License-Identifier: GPL-3.0-or-later
(require 'easymenu)
(require 'rx)
(require 'racket-cmd)
(require 'racket-custom)
(require 'racket-repl)
(require 'racket-util)
(require 'racket-back-end)
;; Need to define this before racket-stepper-mode
(defvar racket-stepper-mode-map
(racket--easy-keymap-define
`((("C-m") ,#'racket-stepper-step)
(("n" "j") ,#'racket-stepper-next-item)
(("p" "k") ,#'racket-stepper-previous-item)
("g" ,#'racket-stepper-refresh))))
(easy-menu-define racket-stepper-mode-menu racket-stepper-mode-map
"Menu for Racket stepper mode."
`("Racket"
["Step" ,#'racket-stepper-step]
["Next" ,#'racket-stepper-next-item]
["Previous" ,#'racket-stepper-previous-item]
["Refresh" ,#'racket-stepper-refresh]))
(defconst racket-stepper-font-lock-keywords
(eval-when-compile
`((,(rx bol "! " (zero-or-more any) eol) . font-lock-warning-face)
(,(rx bol alphanumeric (zero-or-more any) eol) . font-lock-function-name-face)
(,(rx bol "@@" (zero-or-more any) "@@" eol) . font-lock-comment-face)
(,(rx bol "-" (zero-or-more any) eol) . 'diff-removed)
(,(rx bol "+" (zero-or-more any) eol) . 'diff-added))))
(define-derived-mode racket-stepper-mode special-mode "Racket-Stepper"
"Major mode for Racket stepper output.
\\<racket-stepper-mode-map>
Used by the commands `racket-expand-file',
`racket-expand-definition', `racket-expand-region', and
`racket-expand-last-sexp'.
\\{racket-stepper-mode-map}
"
(setq header-line-format
"Press RET to step. C-u RET to step all. C-h m to see help.")
(setq-local font-lock-defaults
(list racket-stepper-font-lock-keywords
t))) ;keywords only -- not strings/comments
(defun racket--stepper-buffer-name ()
(format "*Racket Stepper <%s>*" (racket-back-end-name)))
;;; commands
(defun racket-expand-file (&optional no-hiding)
"Expand the `racket-mode' buffer's file in `racket-stepper-mode'.
Uses the `macro-debugger` package to do the expansion.
You do _not_ need to `racket-run' the file first; the namespace
active in the REPL is not used.
If the file is non-trivial and/or is not compiled to a .zo
bytecode file, then it might take many seconds before the
original form is displayed and you can start stepping.
With \\[universal-argument] behaves as if `racket-expand-hiding'
were \\='disabled."
(interactive "P")
(racket--assert-edit-mode)
(racket--save-if-changed)
(racket-stepper--start nil no-hiding))
(defun racket-expand-region (&optional no-hiding)
"Expand the active region using `racket-stepper-mode'.
Uses the `macro-debugger` package to do the expansion.
With \\[universal-argument] behaves as if `racket-expand-hiding'
were \\='disabled."
(interactive "P")
(unless (region-active-p)
(user-error "No region"))
(racket--assert-edit-mode)
(racket-stepper--expand-text no-hiding
(lambda ()
(cons (region-beginning)
(region-end)))))
(defun racket-expand-definition (&optional no-hiding)
"Expand the definition around point using `racket-stepper-mode'.
Uses the `macro-debugger` package to do the expansion.
With \\[universal-argument] behaves as if `racket-expand-hiding'
were \\='disabled."
(interactive "P")
(racket--assert-sexp-edit-mode)
(racket-stepper--expand-text no-hiding
(lambda ()
(save-excursion
(cons (progn (beginning-of-defun) (point))
(progn (end-of-defun) (point)))))))
(defun racket-expand-last-sexp (&optional no-hiding)
"Expand the sexp before point using `racket-stepper-mode'.
Uses the `macro-debugger` package to do the expansion.
With \\[universal-argument] behaves as if `racket-expand-hiding'
were \\='disabled."
(interactive "P")
(racket--assert-sexp-edit-mode)
(racket-stepper--expand-text no-hiding
(lambda ()
(save-excursion
(cons (progn (backward-sexp) (point))
(progn (forward-sexp) (point)))))))
(defun racket-stepper--expand-text (no-hiding get-region)
(pcase (funcall get-region)
(`(,beg . ,end)
(racket-stepper--start (buffer-substring-no-properties beg end)
no-hiding))))
;; When starting, save the essential parameters in these vars, to
;; support a refresh command.
(defvar racket--stepper-repl-session-id nil)
(defvar racket--stepper-path nil)
(defvar racket--stepper-expr nil)
(defvar racket--stepper-no-hiding nil)
(defun racket-stepper--start (expression-str no-hiding)
"Ensure buffer and issue initial command.
STR should be the expression or nil for file expansion."
(racket--assert-edit-mode)
(setq racket--stepper-repl-session-id (racket--repl-session-id))
(unless (or (not expression-str)
racket--stepper-repl-session-id)
(error "Expression expansion only works when the edit buffer has a REPL buffer, and, you already did a racket-run"))
(setq racket--stepper-path (racket-file-name-front-to-back (racket--buffer-file-name)))
(setq racket--stepper-expr expression-str)
(setq racket--stepper-no-hiding no-hiding)
;; Create buffer if necessary
(let ((name (racket--stepper-buffer-name)))
(unless (get-buffer name)
(with-current-buffer (get-buffer-create name)
(racket-stepper-mode)))
;; Give it a window if necessary
(unless (get-buffer-window name)
(pop-to-buffer (get-buffer name)))
;; Select the stepper window and start.
(select-window (get-buffer-window name))
(racket-stepper-refresh)))
(defun racket-stepper-refresh ()
(interactive)
(let ((inhibit-read-only t))
(delete-region (point-min) (point-max))
(insert "Starting macro expansion stepper... please wait...\n"))
(racket--cmd/async racket--stepper-repl-session-id
`(macro-stepper ,racket--stepper-path
,racket--stepper-expr
,(if racket--stepper-no-hiding
'disable
racket-expand-hiding))
#'racket-stepper--insert))
(defun racket-stepper--insert (steps)
(if (null steps)
(message "Nothing to expand")
(with-current-buffer (racket--stepper-buffer-name)
(let ((inhibit-read-only t))
(goto-char (point-max))
(dolist (step steps)
(pcase step
(`(original . ,text)
(delete-region (point-min) (point-max))
(if racket--stepper-no-hiding
(insert "macro hiding disabled by command prefix")
(insert-text-button "racket-expand-hiding"
'action #'racket-stepper-customize-hiding)
(insert ": ")
(princ (if racket--stepper-no-hiding 'disable racket-expand-hiding)
(current-buffer)))
(insert "\n\n")
(insert "Original\n" text "\n" "\n"))
(`(final . ,text) (insert "Final\n" text "\n"))
(`(,label . ,diff) (insert label "\n" diff "\n"))))
(racket-stepper-previous-item)
(when (equal (selected-window) (get-buffer-window (current-buffer)))
(recenter))))))
(defun racket-stepper-customize-hiding (_btn)
(customize-variable 'racket-expand-hiding))
(defun racket-stepper-step (prefix)
(interactive "P")
(racket--cmd/async racket--stepper-repl-session-id
`(macro-stepper/next ,(if prefix 'all 'next))
#'racket-stepper--insert))
(defconst racket-stepper--item-rx
(rx bol alphanumeric (zero-or-more any) eol))
(defun racket-stepper-next-item (&optional count)
"Move point N items forward.
An \"item\" is a line starting with a log level in brackets.
Interactively, N is the numeric \\[universal-argument] command
prefix argument. If N is omitted or nil, move point 1 item
forward."
(interactive "P")
(forward-char 1)
(if (re-search-forward racket-stepper--item-rx nil t count)
(beginning-of-line)
(backward-char 1)))
(defun racket-stepper-previous-item (&optional count)
"Move point N items backward.
An \"item\" is a line starting with a log level in brackets.
Interactively, N is the numeric \\[universal-argument] command
prefix argument. If N is omitted or nil, move point 1 item
backward."
(interactive "P")
(re-search-backward racket-stepper--item-rx nil t count))
(provide 'racket-stepper)
;;; racket-stepper.el ends here
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