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;;; dockerfile-ts-mode.el --- tree-sitter support for Dockerfiles -*- lexical-binding: t; -*-
;; Copyright (C) 2022-2025 Free Software Foundation, Inc.
;; Author : Randy Taylor <dev@rjt.dev>
;; Maintainer : Randy Taylor <dev@rjt.dev>
;; Created : December 2022
;; Keywords : dockerfile languages tree-sitter
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(require 'treesit)
(eval-when-compile (require 'rx))
(declare-function treesit-parser-create "treesit.c")
(declare-function treesit-node-child "treesit.c")
(declare-function treesit-node-child-by-field-name "treesit.c")
(declare-function treesit-node-type "treesit.c")
(defvar dockerfile-ts-mode--syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?# "<" table)
(modify-syntax-entry ?\n ">" table)
table)
"Syntax table for `dockerfile-ts-mode'.")
(defvar dockerfile-ts-mode--indent-rules
`((dockerfile
((parent-is "copy_instruction") (nth-sibling 1) 0)
((parent-is "env_instruction") (nth-sibling 1) 0)
((parent-is "expose_instruction") (nth-sibling 1) 0)
((parent-is "label_instruction") (nth-sibling 1) 0)
((parent-is "shell_command") first-sibling 0)
((parent-is "string_array") first-sibling 1)
((dockerfile-ts-mode--line-continuation-p) dockerfile-ts-mode--line-continuation-anchor 0)))
"Tree-sitter indent rules.")
(defun dockerfile-ts-mode--line-continuation-p ()
"Return t if the current node is a line continuation node."
(lambda (node _ _ &rest _)
(string= (treesit-node-type node) "\n")))
(defun dockerfile-ts-mode--line-continuation-anchor (_ _ &rest _)
"This anchor is used to align any nodes that are part of a line
continuation to the previous entry."
(save-excursion
(forward-line -1)
(let ((prev-node (treesit-node-at (point))))
(if (string= (treesit-node-type prev-node) "\\\n")
(back-to-indentation)
(forward-word)
(forward-char))
(+ 1 (- (point) (pos-bol))))))
(defvar dockerfile-ts-mode--keywords
'("ADD" "ARG" "AS" "CMD" "COPY" "CROSS_BUILD" "ENTRYPOINT" "ENV"
"EXPOSE" "FROM" "HEALTHCHECK" "LABEL" "MAINTAINER" "ONBUILD" "RUN"
"SHELL" "STOPSIGNAL" "USER" "VOLUME" "WORKDIR")
"Dockerfile keywords for tree-sitter font-locking.")
(defvar dockerfile-ts-mode--font-lock-settings
(treesit-font-lock-rules
:language 'dockerfile
:feature 'bracket
'((["[" "]"]) @font-lock-bracket-face)
:language 'dockerfile
:feature 'comment
'((comment) @font-lock-comment-face)
:language 'dockerfile
:feature 'delimiter
'(([","]) @font-lock-delimiter-face)
:language 'dockerfile
:feature 'image-spec
'((image_spec) @font-lock-constant-face)
:language 'dockerfile
:feature 'keyword
`([,@dockerfile-ts-mode--keywords] @font-lock-keyword-face)
:language 'dockerfile
:feature 'number
'((expose_port) @font-lock-number-face)
:language 'dockerfile
:feature 'operator
'((["="]) @font-lock-operator-face)
:language 'dockerfile
:feature 'string
'((double_quoted_string) @font-lock-string-face)
:language 'dockerfile
:feature 'error
:override t
'((ERROR) @font-lock-warning-face))
"Tree-sitter font-lock settings.")
(defun dockerfile-ts-mode--stage-name (node)
"Return the stage name of NODE.
Return nil if there is no name or if NODE is not a stage node."
(pcase (treesit-node-type node)
("from_instruction"
(treesit-node-text
(or (treesit-node-child-by-field-name node "as")
(treesit-node-child node 1))
t))))
;;;###autoload
(define-derived-mode dockerfile-ts-mode prog-mode "Dockerfile"
"Major mode for editing Dockerfiles, powered by tree-sitter."
:group 'dockerfile
:syntax-table dockerfile-ts-mode--syntax-table
(when (treesit-ready-p 'dockerfile)
(treesit-parser-create 'dockerfile)
;; Comments.
(setq-local comment-start "# ")
(setq-local comment-end "")
(setq-local comment-start-skip (rx "#" (* (syntax whitespace))))
;; Imenu.
(setq-local treesit-simple-imenu-settings
`(("Stage" "\\`from_instruction\\'" nil dockerfile-ts-mode--stage-name)))
(setq-local which-func-functions nil)
;; Indent.
(setq-local treesit-simple-indent-rules
dockerfile-ts-mode--indent-rules)
;; Navigation
(setq-local treesit-thing-settings
`((dockerfile
(sentence "instruction"))))
;; Font-lock.
(setq-local treesit-font-lock-settings
dockerfile-ts-mode--font-lock-settings)
(setq-local treesit-font-lock-feature-list
'((comment)
(keyword string)
(image-spec number)
(bracket delimiter error operator)))
(treesit-major-mode-setup)))
(derived-mode-add-parents 'dockerfile-ts-mode '(dockerfile-mode))
(if (treesit-ready-p 'dockerfile)
(add-to-list 'auto-mode-alist
;; NOTE: We can't use `rx' here, as it breaks bootstrap.
'("\\(?:Dockerfile\\(?:\\..*\\)?\\|\\.[Dd]ockerfile\\)\\'"
. dockerfile-ts-mode)))
(provide 'dockerfile-ts-mode)
;;; dockerfile-ts-mode.el ends here
|
