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;;; gsp-ts-mode --- Tree-Sitter support for GSP -*- lexical-binding: t; -*-
;; Copyright © 2024 Thomas Voss
;; Author: Thomas Voss <mail@thomasvoss.com>
;; Created: September 2024
;; Keywords: languages tree-sitter
;; URL: https://git.thomasvoss.com/gsp-ts-mode
;; Version: 1.0.0
;; Permission to use, copy, modify, and/or distribute this software for any
;; purpose with or without fee is hereby granted.
;;
;; The software is provided ‘as is’ and the author disclaims all warranties with
;; regard to this software including all implied warranties of merchantability
;; and fitness. In no event shall the author be liable for any special, direct,
;; indirect, or consequential damages or any damages whatsoever resulting from
;; loss of use, data or profits, whether in an action of contract, negligence or
;; other tortious action, arising out of or in connection with the use or
;; performance of this software.
;;; Commentary:
;; TODO
;;; Code:
(unless (treesit-available-p)
(error "Tree-Sitter support is required for `gsp-ts-mode'"))
(require 'treesit)
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.gsp\\'" . gsp-ts-mode))
^L
;;; Variables and Options
(defcustom gsp-ts-mode-indent-offset 2
"Number of spaces for each indentation step in `gsp-ts-mode'."
:version "1.0.0"
:type 'integer
:safe 'integerp
:group 'gsp)
(defvar gsp-ts-font-lock-rules
'(:language gsp
:feature delimiter
(["{" "}"] @font-lock-bracket-face)
:language gsp
:feature operator
(["@" "-" "="] @font-lock-operator-face)
:language gsp
:feature tag
((node name: (ident) @font-lock-function-call-face))
:language gsp
:feature attribute
([(id_attr) (class_attr)] @font-lock-constant-face)
:language gsp
:feature attribute
((attr name: (ident) @font-lock-constant-face))
:language gsp
:feature string
((string) @font-lock-string-face)
:language gsp
:override t
:feature comment
((comment) "/" @font-lock-comment-delimiter-face)
:language gsp
:override t
:feature comment
((comment (_) @font-lock-comment-face)))
"Font lock rules for `gsp-ts-mode'.
These settings are passed directly to `treesit-font-lock-rules'. See the
documentation for `treesit-font-lock-rules' for more information.")
(defvar gsp-ts-indent-rules
`((gsp
((parent-is "document") column-0 0)
((node-is "}") parent-bol 0)
((node-is "attr_list") parent gsp-ts-mode-indent-offset)
((node-is ,(regexp-opt '("attr" "id_attr" "class_attr"))) first-sibling 0)
;; The node is nested not in another node, but in a node body
((parent-is "node_body") grand-parent gsp-ts-mode-indent-offset)
((parent-is "text") parent-bol 0)
(catch-all parent 0)
(no-node parent 0)))
"Indentation rules for `gsp-ts-mode'.
These settings are assigned directly to `treesit-simple-indent-rules'.
See the documentation for `treesit-simple-indent-rules' and
`treesit-simple-indent-presets' for more information.")
^L
;;; Integration with ‘electric-indent-mode’
(defun gsp-ts-mode-electric-should-try-indent (char)
"Electric indentation hook for `gsp-ts-mode'.
This function is a hook for `electric-indent-functions' to trigger
automatic indentation as you type.
See the documentation for `electric-indent-mode' and
`electric-indent-functions' for more information."
;; The documentation for ‘electric-indent-functions’ specifies that
;; this should return ‘t’ and not some arbitrary non-nil value.
(and (= char ?\}) t))
^L
;;; Major Mode Setup
(defun gsp-ts--setup ()
"Setup tree-sitter for `gsp-ts-mode'."
(setq-local
treesit-font-lock-settings (apply #'treesit-font-lock-rules
gsp-ts-font-lock-rules)
treesit-simple-indent-rules gsp-ts-indent-rules
treesit-font-lock-feature-list '((comment string)
(tag attribute)
(operator)
(delimiter)))
(treesit-major-mode-setup))
;;;###autoload
(define-derived-mode gsp-ts-mode text-mode "GSP"
"Major mode for editing GSP, powered by Tree-Sitter.
\\<gsp-ts-mode-map>"
:group 'gsp
(setq-local font-lock-defaults nil)
(unless (treesit-ready-p 'gsp)
(error "Tree-Sitter for GSP isn’t available"))
(treesit-parser-create 'gsp)
(gsp-ts--setup)
(with-eval-after-load 'electric
(add-hook 'electric-indent-functions
#'gsp-ts-mode-electric-should-try-indent
nil :local)))
(provide 'gsp-ts-mode)
;;; gsp-ts-mode.el ends here
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