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racket-smart-open.el
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racket-smart-open.el
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;;; racket-smart-open.el -*- lexical-binding: t; -*-
;; Copyright (c) 2013-2020 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
;;; racket-smart-open-bracket-mode
(require 'racket-custom)
(require 'racket-parens)
(require 'racket-ppss)
(require 'racket-util)
;;;###autoload
(define-minor-mode racket-smart-open-bracket-mode
"Minor mode to let you always type `[`' to insert `(` or `[` automatically.
Behaves like the \"Automatically adjust opening square brackets\"
feature in Dr. Racket.
By default, inserts a `(`. Inserts a `[` in the following cases:
- `let`-like bindings -- forms with `let` in the name as well
as things like `parameterize`, `with-handlers`, and
`with-syntax`.
- `case`, `cond`, `match`, `syntax-case`, `syntax-parse`, and
`syntax-rules` clauses.
- `for`-like bindings and `for/fold` accumulators.
- `class` declaration syntax, such as `init` and `inherit`.
When the previous s-expression in a sequence is a compound
expression, uses the same kind of delimiter.
To force insert `[`, use `quoted-insert'.
Combined with `racket-insert-closing' this means that you can
press the unshifted `[` and `]` keys to get whatever delimiters
follow the Racket conventions for these forms. When something
like `electric-pair-mode' or `paredit-mode' is active, you need
not even press `]`.
Tip: When also using `paredit-mode', enable that first so that
the binding for the `[`' key in the map for
`racket-smart-open-bracket-mode' has higher priority. See also
the variable `minor-mode-map-alist'.
Tip: When using this with `racket-hash-lang-mode', you may want
to use `racket-hash-lang-module-language-hook' to enable it IFF
the module langugage is something like \"racket\"."
:lighter " RacketSmartOpen"
:keymap (racket--easy-keymap-define '(("[" racket-smart-open-bracket)))
(racket--assert-edit-or-repl-mode
(lambda () (setq racket-smart-open-bracket-mode nil))))
(defconst racket--smart-open-bracket-data
(eval-when-compile
`(;; cond-like
(0 0 ,(rx (seq "("
(or "augment"
"augment-final"
"augride"
"cond"
"field"
"inherit"
"inherit-field"
"inherit/super"
"inherit/inner"
"init"
"init-field"
"match-lambda"
"match-lambda*"
"match-lambda**"
"overment"
"override"
"override-final"
"public"
"pubment"
"public-final"
"rename-inner"
"rename-super"
"super-new")
(or space line-end))))
;; case-like
(2 0 ,(rx (seq "("
(or "case"
"new"
"match"
"match*"
"syntax-parse"
"syntax-rules")
(or space line-end))))
;; syntax-case
(3 0 ,(rx (seq "("
(or "syntax-case")
(or space line-end))))
;; syntax-case*
(4 0 ,(rx (seq "("
(or "syntax-case*")
(or space line-end))))
;; let-like
;;
;; In addition to the obvious suspects with 'let' in the name,
;; handles forms like 'parameterize', 'with-handlers', 'for',
;; and 'for/fold' accumulator bindings.
(0 1 ,(rx (seq (or "for"
"for/list"
"for/vector"
"for/hash"
"for/hasheq"
"for/hasheqv"
"for/and"
"for/or"
"for/lists"
"for/first"
"for/last"
"for/fold"
"for/foldr"
"for/flvector"
"for/extflvector"
"for/set"
"for/sum"
"for/product"
"for*"
"for*/list"
"for*/vector"
"for*/hash"
"for*/hasheq"
"for*/hasheqv"
"for*/and"
"for*/or"
"for*/lists"
"for*/first"
"for*/last"
"for*/fold"
"for*/foldr"
"for*/flvector"
"for*/extflvector"
"for*/set"
"for*/sum"
"for*/product"
"fluid-let"
"let"
"let*"
"let*-values"
"let-struct"
"let-syntax"
"let-syntaxes"
"let-values"
"let/cc"
"let/ec"
"letrec"
"letrec-syntax"
"letrec-syntaxes"
"letrec-syntaxes+values"
"letrec-values"
"match-let"
"match-let*"
"match-let-values"
"match-let*-values"
"match-letrec"
"parameterize"
"parameterize*"
"with-handlers"
"with-handlers*"
"with-syntax"
"with-syntax*")
(or space line-end))))
;; for/fold bindings
;;
;; Note: Previous item handles the first, accumulators subform.
(0 2 ,(rx (seq (or "for/fold"
"for*/fold"
"for/foldr"
"for*/foldr")
(or space line-end))))
;; named-let bindings
;;
(0 2 ,(rx (seq "let" (1+ whitespace) (1+ (not (in "()[]{}\",'`;#|\" "))))))))
"A list of lists. Each sub list is arguments to supply to
`racket--smart-open-bracket-helper'.")
(defun racket--smart-open-bracket-helper (pre-backward-sexps
post-backward-sexps
regexp)
"Is point at a subform of a known form REGEXP that should open with '['.
Returns '[' or nil."
(and (save-excursion
(ignore-errors
(backward-sexp pre-backward-sexps) t))
(save-excursion
(ignore-errors
(backward-up-list)
(backward-sexp post-backward-sexps)
(when (looking-at-p regexp)
?\[)))))
(defun racket-smart-open-bracket (&optional prefix)
"Automatically insert a `(` or a `[` as appropriate.
See `racket-smart-open-bracket-mode'."
(interactive "P")
(let ((ch (or (and (save-excursion
(let ((pt (point)))
(beginning-of-defun)
(let ((state (parse-partial-sexp (point) pt)))
(or (racket--ppss-string-p state)
(racket--ppss-comment-p state)))))
?\[)
(cl-some (lambda (xs)
(apply #'racket--smart-open-bracket-helper xs))
racket--smart-open-bracket-data)
(racket--open-paren #'backward-sexp)
?\()))
(if (fboundp 'racket--paredit-aware-open)
(racket--paredit-aware-open prefix ch)
(racket--self-insert ch))))
(put 'racket-smart-open-bracket 'delete-selection
#'racket--electric-pair-mode-not-active)
(eval-after-load 'paredit
'(progn
(declare-function paredit-open-round "ext:paredit" (&optional N) t)
(declare-function paredit-open-square "ext:paredit" (&optional N) t)
(declare-function paredit-open-curly "ext:paredit" (&optional N) t)
(defun racket--paredit-aware-open (prefix ch)
"A paredit-aware helper for `racket-smart-open-bracket'.
When `paredit-mode' is active, use its functions, such as
`paredit-open-round'. Note: This function isn't defined unless
paredit is loaded, so check for this function's existence using
`fboundp'."
(let ((paredit-active (and (boundp 'paredit-mode) paredit-mode)))
(cond ((not paredit-active) (racket--self-insert ch))
((eq ch ?\() (paredit-open-round prefix))
((eq ch ?\[) (paredit-open-square prefix))
((eq ch ?\{) (paredit-open-curly prefix))
(t (racket--self-insert ch)))))))
(provide 'racket-smart-open)
;; racket-smart-open.el ends her