bug#59894: [PATCH] Add dockerfile-ts-mode

[Randy Taylor <dev@rjt.dev>]

[-- Attachment #1.1: Type: text/plain, Size: 175 bytes --]

X-Debbugs-CC: casouri@gmail.com

Not adding to auto-mode-alist since the dockerfile-mode package exists.

Got a few more modes (hopefully) coming soon to a theatre near you...

[-- Attachment #1.2: Type: text/html, Size: 1070 bytes --]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: 0001-Add-dockerfile-ts-mode.patch --]
[-- Type: text/x-patch; name=0001-Add-dockerfile-ts-mode.patch, Size: 6923 bytes --]

From 7967f13f8a8cadf9fd931a752aec037c970d697a Mon Sep 17 00:00:00 2001
From: Randy Taylor <dev@rjt.dev>
Date: Wed, 7 Dec 2022 20:53:35 -0500
Subject: [PATCH] Add dockerfile-ts-mode

* etc/NEWS: Mention it.
* lisp/progmodes/dockerfile-ts-mode.el: New major mode with
tree-sitter support.
---
 etc/NEWS                             |   5 +
 lisp/progmodes/dockerfile-ts-mode.el | 169 +++++++++++++++++++++++++++
 2 files changed, 174 insertions(+)
 create mode 100644 lisp/progmodes/dockerfile-ts-mode.el

diff --git a/etc/NEWS b/etc/NEWS
index a8e0ead4a4..4def95ca3f 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -3061,6 +3061,11 @@ A major mode based on the tree-sitter library for editing Bash shell
 scripts.  It includes support for font-locking, indentation, Imenu,
 which-func, and navigation.
 
+** New major mode 'dockerfile-ts-mode'.
+A major mode based on the tree-sitter library for editing
+Dockerfiles.  It includes support for font-locking, indentation, Imenu,
+and which-func.
+
 \f
 * Incompatible Lisp Changes in Emacs 29.1
 
diff --git a/lisp/progmodes/dockerfile-ts-mode.el b/lisp/progmodes/dockerfile-ts-mode.el
new file mode 100644
index 0000000000..fea0e76b8d
--- /dev/null
+++ b/lisp/progmodes/dockerfile-ts-mode.el
@@ -0,0 +1,169 @@
+;;; dockerfile-ts-mode.el --- tree-sitter support for Dockerfiles  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2022 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.
+
+;; 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+;;; Commentary:
+;;
+
+;;; Code:
+
+(require 'treesit)
+(eval-when-compile (require 'rx))
+
+(declare-function treesit-parser-create "treesit.c")
+(declare-function treesit-induce-sparse-tree "treesit.c")
+(declare-function treesit-node-child "treesit.c")
+(declare-function treesit-node-start "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)))
+  "Tree-sitter indent rules.")
+
+(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--imenu ()
+  "Return Imenu alist for the current buffer."
+  (let* ((node (treesit-buffer-root-node))
+         (stage-tree (treesit-induce-sparse-tree
+                      node "from_instruction"
+                      nil 1000)))
+    `(("Stage" . ,(dockerfile-ts-mode--imenu-1 stage-tree)))))
+
+(defun dockerfile-ts-mode--imenu-1 (node)
+  "Helper for `dockerfile-ts-mode--imenu'.
+Find string representation for NODE and set marker, then recurse
+the subtrees."
+  (let* ((ts-node (car node))
+         (children (cdr node))
+         (subtrees (mapcan #'dockerfile-ts-mode--imenu-1
+                           children))
+         (name (when ts-node
+                 (pcase (treesit-node-type ts-node)
+                   ("from_instruction" (treesit-node-text
+                                        (treesit-node-child ts-node 1) t)))))
+         (marker (when ts-node
+                   (set-marker (make-marker)
+                               (treesit-node-start ts-node)))))
+    (cond
+     ((or (null ts-node) (null name)) subtrees)
+     (subtrees
+      `((,name ,(cons name marker) ,@subtrees)))
+     (t
+      `((,name . ,marker))))))
+
+;;;###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 imenu-create-index-function
+                #'dockerfile-ts-mode--imenu)
+    (setq-local which-func-functions nil)
+
+    ;; Indent.
+    (setq-local treesit-simple-indent-rules
+                dockerfile-ts-mode--indent-rules)
+
+    ;; 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)))
+
+(provide 'dockerfile-ts-mode)
+
+;;; dockerfile-ts-mode.el ends here
-- 
2.38.1