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treesit-fold.el
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;;; treesit-fold.el --- Code folding using treesit -*- lexical-binding: t; -*-
;; Copyright (C) 2021-2025 emacs-tree-sitter maintainers
;; Created date 2021-08-11 14:12:37
;; Author: Junyi Hou <[email protected]>
;; Shen, Jen-Chieh <[email protected]>
;; Maintainer: Shen, Jen-Chieh <[email protected]>
;; URL: https://github.com/emacs-tree-sitter/treesit-fold
;; Version: 0.2.1
;; Package-Requires: ((emacs "29.1"))
;; Keywords: convenience folding tree-sitter
;; This file is NOT 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; This package provides a code-folding mechanism based on tree-sitter
;; package. Turn on the minor-mode `treesit-fold-mode' to enable
;; this mechanism. Note that all functionalities provided here based on the
;; `tree-sitter-mode', and thus it should be enabled before
;; `treesit-fold-mode' can properly fold codes.
;;; Code:
(require 'mule-util)
(require 'seq)
(require 'subr-x)
(require 'treesit)
(require 'treesit-fold-util)
(require 'treesit-fold-parsers)
(require 'treesit-fold-summary)
;;
;; (@* "Customization" )
;;
(defgroup treesit-fold nil
"Code folding using tree-sitter."
:group 'tree-sitter
:prefix "treesit-fold-")
;; TODO(everyone): This is a bit messy, but try to keep this alist
;; alphabetically sorted
(defcustom treesit-fold-range-alist
`((actionscript-mode . ,(treesit-fold-parsers-actionscript))
(agda-mode . ,(treesit-fold-parsers-agda))
(arduino-mode . ,(treesit-fold-parsers-arduino))
(asm-mode . ,(treesit-fold-parsers-asm))
(awk-mode . ,(treesit-fold-parsers-awk))
(awk-ts-mode . ,(treesit-fold-parsers-awk))
(editorconfig-conf-mode . ,(treesit-fold-parsers-editorconfig))
(fasm-mode . ,(treesit-fold-parsers-asm))
(masm-mode . ,(treesit-fold-parsers-asm))
(nasm-mode . ,(treesit-fold-parsers-asm))
(gas-mode . ,(treesit-fold-parsers-asm))
(bash-ts-mode . ,(treesit-fold-parsers-bash))
(beancount-mode . ,(treesit-fold-parsers-beancount))
(beancount-ts-mode . ,(treesit-fold-parsers-beancount))
(c-mode . ,(treesit-fold-parsers-c))
(c-ts-mode . ,(treesit-fold-parsers-c))
(c++-mode . ,(treesit-fold-parsers-c++))
(c++-ts-mode . ,(treesit-fold-parsers-c++))
(caml-mode . ,(treesit-fold-parsers-ocaml))
(caml-ts-mode . ,(treesit-fold-parsers-ocaml))
(cmake-mode . ,(treesit-fold-parsers-cmake))
(cmake-ts-mode . ,(treesit-fold-parsers-cmake))
(clojure-mode . ,(treesit-fold-parsers-clojure))
(clojure-ts-mode . ,(treesit-fold-parsers-clojure))
(csharp-mode . ,(treesit-fold-parsers-csharp))
(csharp-ts-mode . ,(treesit-fold-parsers-csharp))
(css-mode . ,(treesit-fold-parsers-css))
(css-ts-mode . ,(treesit-fold-parsers-css))
(dart-mode . ,(treesit-fold-parsers-dart))
(dart-ts-mode . ,(treesit-fold-parsers-dart))
(emacs-lisp-mode . ,(treesit-fold-parsers-elisp))
(elixir-mode . ,(treesit-fold-parsers-elixir))
(elixir-ts-mode . ,(treesit-fold-parsers-elixir))
(erlang-mode . ,(treesit-fold-parsers-erlang))
(erlang-ts-mode . ,(treesit-fold-parsers-erlang))
(ess-r-mode . ,(treesit-fold-parsers-r))
(fish-mode . ,(treesit-fold-parsers-fish))
(gdscript-mode . ,(treesit-fold-parsers-gdscript))
(gdscript-ts-mode . ,(treesit-fold-parsers-gdscript))
(gleam-ts-mode . ,(treesit-fold-parsers-gleam))
(glsl-mode . ,(treesit-fold-parsers-glsl))
(go-mode . ,(treesit-fold-parsers-go))
(go-ts-mode . ,(treesit-fold-parsers-go))
(go-mod-ts-mode . ,(treesit-fold-parsers-go))
(groovy-mode . ,(treesit-fold-parsers-groovy))
(jenkinsfile-mode . ,(treesit-fold-parsers-groovy))
(haskell-mode . ,(treesit-fold-parsers-haskell))
(haskell-ts-mode . ,(treesit-fold-parsers-haskell))
(haxe-mode . ,(treesit-fold-parsers-haxe))
(heex-mode . ,(treesit-fold-parsers-heex))
(heex-ts-mode . ,(treesit-fold-parsers-heex))
(hlsl-mode . ,(treesit-fold-parsers-hlsl))
(hlsl-ts-mode . ,(treesit-fold-parsers-hlsl))
(html-mode . ,(treesit-fold-parsers-html))
(html-ts-mode . ,(treesit-fold-parsers-html))
(jai-mode . ,(treesit-fold-parsers-jai))
(janet-mode . ,(treesit-fold-parsers-janet))
(java-mode . ,(treesit-fold-parsers-java))
(java-ts-mode . ,(treesit-fold-parsers-java))
(javascript-mode . ,(treesit-fold-parsers-javascript))
(js-mode . ,(treesit-fold-parsers-javascript))
(js-ts-mode . ,(treesit-fold-parsers-javascript))
(js2-mode . ,(treesit-fold-parsers-javascript))
(js3-mode . ,(treesit-fold-parsers-javascript))
(json-mode . ,(treesit-fold-parsers-json))
(json-ts-mode . ,(treesit-fold-parsers-json))
(jsonc-mode . ,(treesit-fold-parsers-json))
(jsonnet-mode . ,(treesit-fold-parsers-jsonnet))
(julia-mode . ,(treesit-fold-parsers-julia))
(julia-ts-mode . ,(treesit-fold-parsers-julia))
(kotlin-mode . ,(treesit-fold-parsers-kotlin))
(kotlin-ts-mode . ,(treesit-fold-parsers-kotlin))
(latex-mode . ,(treesit-fold-parsers-latex))
(latex-ts-mode . ,(treesit-fold-parsers-latex))
(LaTeX-mode . ,(treesit-fold-parsers-latex))
(lisp-mode . ,(treesit-fold-parsers-lisp))
(lisp-interaction-mode . ,(treesit-fold-parsers-lisp))
(llvm-mode . ,(treesit-fold-parsers-llvm))
(llvm-mir-mode . ,(treesit-fold-parsers-llvm-mir))
(lua-mode . ,(treesit-fold-parsers-lua))
(lua-ts-mode . ,(treesit-fold-parsers-lua))
(makefile-mode . ,(treesit-fold-parsers-make))
(makefile-ts-mode . ,(treesit-fold-parsers-make))
(makefile-automake-mode . ,(treesit-fold-parsers-make))
(makefile-gmake-mode . ,(treesit-fold-parsers-make))
(makefile-makepp-mode . ,(treesit-fold-parsers-make))
(makefile-bsdmake-mode . ,(treesit-fold-parsers-make))
(makefile-imake-mode . ,(treesit-fold-parsers-make))
(markdown-mode . ,(treesit-fold-parsers-markdown))
(markdown-ts-mode . ,(treesit-fold-parsers-markdown))
(matlab-mode . ,(treesit-fold-parsers-matlab))
(mermaid-mode . ,(treesit-fold-parsers-mermaid))
(mermaid-ts-mode . ,(treesit-fold-parsers-mermaid))
(ninja-mode . ,(treesit-fold-parsers-ninja))
(noir-mode . ,(treesit-fold-parsers-noir))
(noir-ts-mode . ,(treesit-fold-parsers-noir))
(nix-mode . ,(treesit-fold-parsers-nix))
(nix-ts-mode . ,(treesit-fold-parsers-nix))
(ocaml-mode . ,(treesit-fold-parsers-ocaml))
(ocaml-ts-mode . ,(treesit-fold-parsers-ocaml))
(org-mode . ,(treesit-fold-parsers-org))
(pascal-mode . ,(treesit-fold-parsers-pascal))
(perl-mode . ,(treesit-fold-parsers-perl))
(php-mode . ,(treesit-fold-parsers-php))
(php-ts-mode . ,(treesit-fold-parsers-php))
(python-mode . ,(treesit-fold-parsers-python))
(python-ts-mode . ,(treesit-fold-parsers-python))
(qss-mode . ,(treesit-fold-parsers-qss))
(rjsx-mode . ,(treesit-fold-parsers-javascript))
(rst-mode . ,(treesit-fold-parsers-rst))
(ruby-mode . ,(treesit-fold-parsers-ruby))
(ruby-ts-mode . ,(treesit-fold-parsers-ruby))
(rust-mode . ,(treesit-fold-parsers-rust))
(rust-ts-mode . ,(treesit-fold-parsers-rust))
(rustic-mode . ,(treesit-fold-parsers-rust))
(scheme-mode . ,(treesit-fold-parsers-scheme))
(sh-mode . ,(treesit-fold-parsers-bash))
(scala-mode . ,(treesit-fold-parsers-scala))
(scala-ts-mode . ,(treesit-fold-parsers-scala))
(sql-mode . ,(treesit-fold-parsers-sql))
(svelte-mode . ,(treesit-fold-parsers-svelte))
(swift-mode . ,(treesit-fold-parsers-swift))
(tablegen-mode . ,(treesit-fold-parsers-tablegen))
(toml-mode . ,(treesit-fold-parsers-toml))
(toml-ts-mode . ,(treesit-fold-parsers-toml))
(conf-toml-mode . ,(treesit-fold-parsers-toml))
(tuareg-mode . ,(treesit-fold-parsers-ocaml))
(typescript-mode . ,(treesit-fold-parsers-typescript))
(typescript-ts-mode . ,(treesit-fold-parsers-typescript))
(tsx-ts-mode . ,(treesit-fold-parsers-typescript))
(verilog-mode . ,(treesit-fold-parsers-verilog))
(verilog-ts-mode . ,(treesit-fold-parsers-verilog))
(vhdl-mode . ,(treesit-fold-parsers-vhdl))
(vhdl-ts-mode . ,(treesit-fold-parsers-vhdl))
(vimscript-ts-mode . ,(treesit-fold-parsers-vimscript))
(nxml-mode . ,(treesit-fold-parsers-xml))
(xml-ts-mode . ,(treesit-fold-parsers-xml))
(yaml-mode . ,(treesit-fold-parsers-yaml))
(yaml-ts-mode . ,(treesit-fold-parsers-yaml))
(k8s-mode . ,(treesit-fold-parsers-yaml))
(zig-mode . ,(treesit-fold-parsers-zig)))
"An alist of (major-mode . (foldable-node-type . function)).
FUNCTION is used to determine where the beginning and end for FOLDABLE-NODE-TYPE
in MAJOR-MODE. It should take a single argument (the syntax node with type
FOLDABLE-NODE-TYPE) and return the buffer positions of the beginning and end of
the fold in a cons cell. See `treesit-fold-range-python-def' for an example."
:type '(alist :key-type symbol
:value-type (alist :key-type symbol :value-type function))
:group 'treesit-fold)
(defcustom treesit-fold-mode-hook nil
"Hook to run when enabling `treesit-fold-mode`."
:type 'hook
:group 'treesit-fold)
(defcustom treesit-fold-on-fold-hook nil
"Hook runs on folding."
:type 'hook
:group 'treesit-fold)
(defcustom treesit-fold-on-next-line t
"If non-nil, we leave ending keywords on the next line.
This is only used in languages that uses keyword to end the scope.
For example, Lua, Ruby, etc."
:type 'boolean
:group 'treesit-fold)
(defcustom treesit-fold-priority 30
"Fold range overlay's priority."
:type 'integer
:group 'treesit-fold)
(defface treesit-fold-replacement-face
'((t :foreground "#808080" :box (:line-width -1 :style pressed-button)))
"Face used to display the fold replacement text."
:group 'treesit-fold)
(defface treesit-fold-replacement-mouse-face
'((t :foreground "#808080" :box (:line-width -1 :style released-button)))
"Face used to when mouse hovering replacement text."
:group 'treesit-fold)
(defface treesit-fold-fringe-face
'((t ()))
"Face used to display fringe contents."
:group 'treesit-fold)
(defcustom treesit-fold-line-count-show nil
"Show the number of lines in folded text."
:type 'boolean
:group 'treesit-fold)
(defcustom treesit-fold-line-count-format
(concat (truncate-string-ellipsis)
" %d "
(truncate-string-ellipsis))
"Format string for displaying line count in folded text.
The %d will be replaced with the number of lines in the folded region."
:type 'string
:group 'treesit-fold)
;;
;; (@* "Externals" )
;;
(defvar treesit-fold-indicators-mode)
(declare-function treesit-fold-indicators-mode "treesit-fold-indicators.el")
(declare-function treesit-fold-indicators-refresh "treesit-fold-indicators.el")
(defun treesit-fold--indicators-refresh ()
"Safe version of the `treesit-fold-indicators-refresh' function."
(when (bound-and-true-p treesit-fold-indicators-mode)
(treesit-fold-indicators-refresh)))
;;
;; (@* "Entry" )
;;
(defvar-keymap treesit-fold-mode-map
:doc "Keymap used when `treesit-fold-mode' is active.")
(defun treesit-fold--enable ()
"Start folding minor mode."
(setq-local line-move-ignore-invisible t)
(add-to-invisibility-spec '(treesit-fold . t))
;; evil integration
(when (bound-and-true-p evil-fold-list)
(add-to-list 'evil-fold-list
'((treesit-fold-mode)
:toggle treesit-fold-toggle
:open treesit-fold-open
:close treesit-fold-close
:open-rec treesit-fold-open-recursively
:open-all treesit-fold-open-all
:close-all treesit-fold-close-all))))
(defun treesit-fold--disable ()
"Stop folding minor mode."
(remove-from-invisibility-spec '(treesit-fold . t))
(treesit-fold-open-all))
(defun treesit-fold-ready-p ()
"Return non-nil if the current buffer has a tree-sitter parser."
(treesit-parser-list))
(defun treesit-fold--trigger ()
"Enable `treesit-fold-mode' when the current mode is treesit-fold compatible."
(when (and (treesit-fold-ready-p)
(treesit-fold-usable-mode-p))
(treesit-fold-mode 1)))
;;;###autoload
(define-minor-mode treesit-fold-mode
"Folding code using tree sitter."
:group 'treesit-fold
:init-value nil
:lighter " Treesit-Fold"
:keymap treesit-fold-mode-map
(cond
((not (and (treesit-available-p)
(treesit-parser-list)
(treesit-fold-usable-mode-p)))
(when treesit-fold-mode
(treesit-fold-mode -1)))
(treesit-fold-mode
(treesit-fold--enable) t)
(t
(treesit-fold--disable))))
;;;###autoload
(define-globalized-minor-mode global-treesit-fold-mode
treesit-fold-mode treesit-fold--trigger
:group 'treesit-fold)
(defun treesit-fold-usable-mode-p (&optional mode)
"Return non-nil if `treesit-fold' has defined folds for MODE."
(let ((mode (or mode major-mode)))
(alist-get mode treesit-fold-range-alist)))
;;;###autoload
(define-minor-mode treesit-fold-line-comment-mode
"Enable line comment folding."
:group 'treesit-fold
:init-value nil
(treesit-fold--indicators-refresh))
;;
;; (@* "Core" )
;;
(defun treesit-fold--range-on-same-line (range)
"Return non-nil if RANGE is on the same line."
(let ((beg (car range))
(end (cdr range))
(lbp) (lep))
(save-excursion
(goto-char beg)
(setq lbp (line-beginning-position)
lep (line-end-position)))
(and (<= lbp beg) (<= beg lep)
(<= lbp end) (<= end lep))))
(defun treesit-fold--get-fold-range (node)
"Return the beginning (as buffer position) of fold for NODE.
Return nil if there is no fold to be made."
(when-let* ((fold-alist (alist-get major-mode treesit-fold-range-alist))
(fold-func (alist-get (intern (treesit-node-type node)) fold-alist)))
(cond ((functionp fold-func) (funcall fold-func node (cons 0 0)))
((listp fold-func) (funcall (nth 0 fold-func) node (cons (nth 1 fold-func) (nth 2 fold-func))))
(t (user-error "Bad folding function for node")))))
(defun treesit-fold--node-range-on-same-line (node)
"Return non-nil when NODE range is on the same line."
(let ((range (treesit-fold--get-fold-range node)))
(or (not range) ; Range not defined, continue.
(treesit-fold--range-on-same-line range)))) ; On same line, continue.
(defun treesit-fold--non-foldable-node-p (node mode-ranges)
"Return non-nil if NODE is a non-foldable in MODE-RANGES."
(or (not (alist-get (intern (treesit-node-type node)) mode-ranges)) ; Not registered, continue.
(treesit-fold--node-range-on-same-line node))) ; On same line, continue.
(defun treesit-fold--foldable-node-at-pos (&optional pos)
"Return the smallest foldable node at POS. If POS is nil, use `point'.
Return nil if no valid node is found.
This function is borrowed from `tree-sitter-node-at-point'."
(let* ((pos (or pos (point)))
(mode-ranges (alist-get major-mode treesit-fold-range-alist))
(root (treesit-buffer-root-node))
(node (treesit-node-descendant-for-range root pos pos))
;; Used for looping
(current node))
(while (and current
(treesit-fold--non-foldable-node-p current mode-ranges))
(setq current (treesit-node-parent current)))
current))
;;
;; (@* "Overlays" )
;;
(defun treesit-fold--format-overlay-text (beg end)
"Return the text to display in the overlay for the fold from BEG to END."
(let ((summary (and treesit-fold-summary-show
(treesit-fold-summary--get (buffer-substring beg end)))))
(cond
;; Handle line count display.
((when-let*
((line-count (and treesit-fold-line-count-show
(count-lines beg end)))
(line-count-str (format treesit-fold-line-count-format line-count)))
(concat (or summary "") line-count-str)))
;; `summary' handles truncation itself; just return it if not nil.
(summary )
;; Fallback to ellipsis.
(t (truncate-string-ellipsis)))))
(defun treesit-fold--create-overlay (range)
"Create invisible overlay in RANGE."
(when range
(let* ((beg (car range))
(end (cdr range))
(ov (make-overlay beg end))
(map (make-sparse-keymap)))
(define-key map (kbd "<mouse-1>") #'treesit-fold-open)
(overlay-put ov 'creator 'treesit-fold)
(overlay-put ov 'priority treesit-fold-priority)
(overlay-put ov 'invisible 'treesit-fold)
(overlay-put ov 'display
(propertize (treesit-fold--format-overlay-text beg end)
'mouse-face 'treesit-fold-replacement-mouse-face
'help-echo "mouse-1: unfold this node"
'keymap map))
(overlay-put ov 'face 'treesit-fold-replacement-face)
(overlay-put ov 'modification-hooks '(treesit-fold--on-change))
(overlay-put ov 'insert-in-front-hooks '(treesit-fold--on-change))
(overlay-put ov 'isearch-open-invisible #'treesit-fold--on-change)
(overlay-put ov 'isearch-open-invisible-temporary #'treesit-fold--open-invisible-temporary)
ov)))
(defun treesit-fold--open-invisible-temporary (ov hide-p)
"Temporary show/hide OV depends on HIDE-P flag."
(if hide-p (treesit-fold--hide-ov ov)
(treesit-fold--show-ov ov)))
(defun treesit-fold--on-change (ov &rest _)
"Open overlay OV during content is changed."
(delete-overlay ov))
(defun treesit-fold--show-ov (ov &rest _)
"Show the OV."
(overlay-put ov 'invisible nil)
(overlay-put ov 'display nil)
(overlay-put ov 'face nil)
(treesit-fold--indicators-refresh))
(defun treesit-fold--hide-ov (ov &rest _)
"Hide the OV."
(let ((beg (overlay-start ov))
(end (overlay-end ov)))
(overlay-put ov 'invisible 'treesit-fold)
(overlay-put ov 'display
(propertize (treesit-fold--format-overlay-text beg end)
'mouse-face 'treesit-fold-replacement-mouse-face
'help-echo "mouse-1: unfold this node"
'keymap (overlay-get ov 'keymap)))
(overlay-put ov 'face 'treesit-fold-replacement-face))
(treesit-fold--indicators-refresh))
(defun treesit-fold-overlay-at (node)
"Return the treesit-fold overlay at NODE if NODE is foldable and folded.
Return nil otherwise."
(when-let* ((range (treesit-fold--get-fold-range node)))
(thread-last (overlays-in (car range) (cdr range))
(seq-filter (lambda (ov)
(and (eq (overlay-get ov 'invisible) 'treesit-fold)
(= (overlay-start ov) (car range))
(= (overlay-end ov) (cdr range)))))
car)))
;;
;; (@* "Commands" )
;;
(defmacro treesit-fold--ensure-ts (&rest body)
"Run BODY only if `tree-sitter-mode` is enabled."
(declare (indent 0))
`(if (treesit-fold-ready-p)
(progn ,@body)
(user-error "Ignored, no tree-sitter parser in current buffer")))
;;;###autoload
(defun treesit-fold-close (&optional node)
"Fold the syntax node at `point` if it is foldable.
Foldable nodes are defined in `treesit-fold-range-alist' for the
current `major-mode'.
If no NODE is found in point, do nothing."
(interactive)
(treesit-fold--ensure-ts
(when-let* ((node (or node (treesit-fold--foldable-node-at-pos))))
;; make sure I do not create multiple overlays for the same fold
(when-let* ((ov (treesit-fold-overlay-at node)))
(delete-overlay ov))
(when-let* ((range (treesit-fold--get-fold-range node))
(ov (treesit-fold--create-overlay range)))
(run-hooks 'treesit-fold-on-fold-hook)
ov))))
;;;###autoload
(defun treesit-fold-open ()
"Open the fold of the syntax node in which `point' resides.
If the current node is not folded or not foldable, do nothing."
(interactive)
(treesit-fold--ensure-ts
(when-let* ((node (treesit-fold--foldable-node-at-pos))
(ov (treesit-fold-overlay-at node)))
(delete-overlay ov)
(run-hooks 'treesit-fold-on-fold-hook)
t)))
;;;###autoload
(defun treesit-fold-open-recursively ()
"Open recursively folded syntax NODE that are contained in the node at point."
(interactive)
(treesit-fold--ensure-ts
(when-let* ((node (treesit-fold--foldable-node-at-pos))
(beg (treesit-node-start node))
(end (treesit-node-end node))
(nodes (treesit-fold--overlays-in 'invisible 'treesit-fold beg end)))
(mapc #'delete-overlay nodes)
(run-hooks 'treesit-fold-on-fold-hook)
t)))
;;;###autoload
(defun treesit-fold-close-all ()
"Fold all foldable syntax nodes in the buffer."
(interactive)
(treesit-fold--ensure-ts
(let (nodes)
(let* ((treesit-fold-indicators-mode)
(treesit-fold-on-fold-hook)
(node (treesit-buffer-root-node))
(patterns (seq-mapcat (lambda (fold-range) `((,(car fold-range)) @name))
(alist-get major-mode treesit-fold-range-alist)))
(query (treesit-query-compile (treesit-node-language node) patterns)))
(setq nodes (treesit-query-capture node query)
nodes (cl-remove-if (lambda (node)
;; Removed if on same line
(treesit-fold--node-range-on-same-line (cdr node)))
nodes))
(thread-last nodes
(mapcar #'cdr)
(mapc #'treesit-fold-close)))
(when nodes
(run-hooks 'treesit-fold-on-fold-hook)
t))))
;;;###autoload
(defun treesit-fold-open-all ()
"Unfold all syntax nodes in the buffer."
(interactive)
(treesit-fold--ensure-ts
(when-let* ((nodes (treesit-fold--overlays-in 'invisible 'treesit-fold)))
(mapc #'delete-overlay nodes)
(run-hooks 'treesit-fold-on-fold-hook)
t)))
;;;###autoload
(defun treesit-fold-toggle ()
"Toggle the syntax node at `point'.
If the current syntax node is not foldable, do nothing."
(interactive)
(treesit-fold--ensure-ts
(if-let* ((node (treesit-fold--foldable-node-at-pos (point)))
(ov (treesit-fold-overlay-at node)))
(progn
(delete-overlay ov)
(run-hooks 'treesit-fold-on-fold-hook)
t)
(treesit-fold-close))))
(defun treesit-fold--after-command (&rest _)
"Function call after interactive commands."
(treesit-fold--indicators-refresh))
(let ((commands '(treesit-fold-close
treesit-fold-open
treesit-fold-open-recursively
treesit-fold-close-all
treesit-fold-open-all
treesit-fold-toggle)))
(dolist (command commands)
(advice-add command :after #'treesit-fold--after-command)))
;;
;; (@* "Rule Helpers" )
;;
(defun treesit-fold--next-prev-node (node next)
"Return previous/next sibling node starting from NODE.
If NEXT is non-nil, return next sibling. Otherwirse, return previouse sibling."
(if next (treesit-node-next-sibling node) (treesit-node-prev-sibling node)))
(defun treesit-fold--next-prev-node-skip-newline (node next)
"Like function `treesit-fold--next-prev-node'.
For arguments NODE and NEXT, please see the function
`treesit-fold--next-prev-node' for more information."
(let ((iter-node (treesit-fold--next-prev-node node next)))
(while (and iter-node
(equal "\n" (ignore-errors (treesit-node-text iter-node))))
(setq iter-node (treesit-fold--next-prev-node iter-node next)))
iter-node))
(defun treesit-fold--continuous-node-prefix (node prefix next)
"Iterate through node starting from NODE and compare node-text to PREFIX;
then return the last iterated node.
Argument NEXT is a boolean type. If non-nil iterate forward; otherwise iterate
in backward direction."
(let* ((iter-node node) (last-node node)
(last-line (car (treesit-fold--node-start-point node))) line text break
(line-range 1) (last-line-range 1) max-line-range
(indentation (treesit-fold--indentation (treesit-node-start iter-node)))
next-indentation)
(while (and iter-node (not break))
(setq text (string-trim (treesit-node-text iter-node))
line (car (treesit-fold--node-start-point iter-node))
line-range (1+ (treesit-fold--count-matches "\n" text))
max-line-range (max line-range last-line-range)
next-indentation (treesit-fold--indentation (treesit-node-start iter-node)))
(if (and (treesit-fold--in-range-p line (- last-line max-line-range) (+ last-line max-line-range))
(string-prefix-p prefix text)
(= indentation next-indentation))
(setq last-node iter-node last-line line
last-line-range (1+ (treesit-fold--count-matches "\n" text)))
(setq break t))
(setq iter-node (treesit-fold--next-prev-node-skip-newline iter-node next)))
last-node))
(defun treesit-fold-range-seq (node offset)
"Return the fold range in sequence starting from NODE.
Argument OFFSET can be used to tweak the final beginning and end position."
(let ((beg (1+ (treesit-node-start node)))
(end (1- (treesit-node-end node))))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-markers (node offset start-seq &optional end-seq)
"Return the fold range for NODE with an OFFSET where the range starts at
the end of the first occurence of START-SEQ and ends at the end of the node
or the start of the last occurence of the optional parameter LAST-SEQ.
START-SEQ and LAST-SEQ can be named tree-sitter nodes or anonomous nodes.
If no occurence is found for START-SEQ or END-SEQ or the
occurences overlap, then the range returned is nil."
(when start-seq
(when-let* ((beg-node (car (treesit-fold-find-children node start-seq)))
(end-node (if end-seq
(car (last (treesit-fold-find-children node end-seq)))
node))
(beg (treesit-node-end beg-node))
(end (if end-seq
(treesit-node-start end-node)
(1- (treesit-node-end node)))))
(unless (> beg end) (treesit-fold--cons-add (cons beg end) offset)))))
(defun treesit-fold-range-line-comment (node offset prefix)
"Define fold range for line comment.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information.
Argument PREFIX is the comment prefix in string."
(save-excursion
(when-let* ((treesit-fold-line-comment-mode) ; XXX: Check enabled!?
(first-node (ignore-errors
(treesit-fold--continuous-node-prefix node prefix nil)))
(last-node (ignore-errors
(treesit-fold--continuous-node-prefix node prefix t)))
(prefix-len (length prefix))
(beg (+ (treesit-node-start first-node) prefix-len))
(end (treesit-node-end last-node)))
(treesit-fold--cons-add (cons beg end) offset))))
(defun treesit-fold-range-block-comment (node offset)
"Define fold range for block comment.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(treesit-fold-range-seq node (treesit-fold--cons-add '(1 . -1) offset)))
(defun treesit-fold-range-c-like-comment (node offset)
"Define fold range for C-like comemnt.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(let ((text (treesit-node-text node)))
(if (and (string-match-p "\n" text) (string-prefix-p "/*" text))
(treesit-fold-range-block-comment node offset)
(if (string-prefix-p "///" text)
(treesit-fold-range-line-comment node offset "///")
(treesit-fold-range-line-comment node offset "//")))))
;;
;; (@* "Languages" )
;;
(defun treesit-fold-range-asm--find-last-instruction (node)
"Find the last instruction node by starting NODE."
(let* ((iter-node (treesit-fold--next-prev-node-skip-newline node t))
(last iter-node))
(while (and iter-node
(not (member (treesit-node-type iter-node)
(treesit-fold-listify "label"))))
(setq last iter-node
iter-node (treesit-fold--next-prev-node-skip-newline iter-node t)))
last)) ; return last insturction node
(defun treesit-fold-range-asm-label (node offset)
"Define fold range for `label' in Assembly.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((beg (treesit-node-end node))
(end (treesit-fold-range-asm--find-last-instruction node))
(end (treesit-node-end end)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-beancount-transaction (node offset)
"Define fold range for `transaction' in Beancount.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((beg (treesit-node-start node))
(beg (treesit-fold--eol beg))
(end (1- (treesit-node-end node))))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-c-preproc-if (node offset)
"Define fold range for `if' preprocessor.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(let* ((named-node (treesit-node-child-by-field-name node "condition"))
(else (or (treesit-node-child-by-field-name node "alternative")
(car (treesit-fold-find-children node "#endif"))))
(beg (treesit-node-end named-node))
(end (1- (treesit-node-start else))))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-c-preproc-ifdef (node offset)
"Define fold range for `ifdef' and `ifndef' preprocessor.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((named-node (treesit-node-child-by-field-name node "name"))
(else (or (treesit-node-child-by-field-name node "alternative")
(car (treesit-fold-find-children node "#endif"))))
(beg (treesit-node-end named-node))
(end (1- (treesit-node-start else))))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-c-preproc-elif (node offset)
"Define fold range for `elif' preprocessor.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((named-node (treesit-node-child-by-field-name node "condition"))
(parent (or (treesit-fold-find-parent node "preproc_if")
(treesit-fold-find-parent node "preproc_ifdef")))
(next (or (treesit-node-child-by-field-name node "alternative")
(car (treesit-fold-find-children parent "#endif"))))
(beg (treesit-node-end named-node))
(end (1- (treesit-node-start next))))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-c-preproc-else (node offset)
"Define fold range for `else' preprocessor.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((else-str (car (split-string (treesit-node-text node) "\n")))
(parent (or (treesit-fold-find-parent node "preproc_if")
(treesit-fold-find-parent node "preproc_ifdef")))
(next (car (treesit-fold-find-children parent "#endif")))
(beg (+ (treesit-node-start node) (length else-str)))
(end (1- (treesit-node-start next))))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-clojure-function (node offset)
"Return the fold range for `list_lit' NODE in Clojure.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((name-node (nth 1 (treesit-fold-find-children node "sym_lit")))
(next-node (treesit-node-next-sibling name-node))
(beg (treesit-node-start next-node))
(end (1- (treesit-node-end node))))
(unless treesit-fold-on-next-line ; display nicely
(setq beg (treesit-fold--last-eol beg)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-cmake-body (node offset)
"Return the fold range for `body' NODE in CMake.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((beg (treesit-node-start node))
(end (treesit-node-end node)))
(when treesit-fold-on-next-line ; display nicely
(setq end (treesit-fold--last-eol end)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-editorconfig-end-section (node)
"Return the section NODE's end point."
(let ((pt (treesit-node-end node))
(children (reverse (treesit-node-children node))))
(or (cl-some (lambda (child)
(when (equal 'pair (treesit-node-type child))
(treesit-node-end child)))
children)
pt)))
(defun treesit-fold-range-editorconfig-section (node offset)
"Return the fold range for `section' NODE in EditorConfig.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((end-bracket (car (treesit-fold-find-children node "]")))
(beg (treesit-node-end end-bracket))
(end (1- (treesit-fold-range-editorconfig-end-section node))))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-elisp-function (node offset)
"Return the fold range for `macro_definition' and `function_definition' NODE
in Elisp.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((param-node (treesit-node-child node 4))
(beg (treesit-node-start param-node))
(end (1- (treesit-node-end node))))
(unless treesit-fold-on-next-line ; display nicely
(setq beg (treesit-fold--last-eol beg)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-elixir (node offset)
"Return the fold range for `function' `module' NODE in Elixir.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((end-child (treesit-fold-last-child node))
(do-child (treesit-node-child node 1))
(beg (treesit-node-start do-child))
(beg (treesit-fold--last-eol beg))
(end (treesit-node-start end-child)))
(when treesit-fold-on-next-line ; display nicely
(setq end (treesit-fold--last-eol end)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-erlang-signature (node offset start)
"Return the fold range for generic signature NODE in Erlang.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information.
Argument START is a string to target for the first node we use to find the
start of the position."
(when-let* ((start-node (car (treesit-fold-find-children node start)))
(beg (treesit-node-end start-node))
(end (treesit-node-end node)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-erlang-clause-body (node offset)
"Return the fold range for `clause_body' NODE in Erlang.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(treesit-fold-range-erlang-signature node offset "->"))
(defun treesit-fold-range-erlang-type-guards (node offset)
"Return the fold range for `type_guards' NODE in Erlang.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(treesit-fold-range-erlang-signature node offset "when"))
(defun treesit-fold-range-fish-function (node offset)
"Define fold range for `function' in Fish.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((func-name (treesit-node-child node 1))
(beg (treesit-node-end func-name))
(end (treesit-node-end node))
(end (- end 3)))
(when treesit-fold-on-next-line ; display nicely
(setq end (treesit-fold--last-eol end)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-fish-if (node offset)
"Define fold range for `if_statement' in Fish.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((beg (treesit-node-start node))
(beg (treesit-fold--eol beg))
(end (treesit-node-end node))
(end (- end 3)))
(when treesit-fold-on-next-line ; display nicely
(setq end (treesit-fold--last-eol end)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-fish-case (node offset)
"Define fold range for `case_clause' in Fish.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((beg (treesit-node-start node))
(beg (treesit-fold--eol beg))
(end (treesit-node-end node))
(end (1- end)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-gleam (node offset)
"Return the fold range for `function' `type_definition' NODE in Gleam.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((open-bracket (car (treesit-fold-find-children node "{")))
(beg (treesit-node-start open-bracket))
(beg (1+ beg))
(end (treesit-node-end node))
(end (1- end)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-groovy-block (node offset)
"Define fold range for `block' in Groovy.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((open-bracket (car (treesit-fold-find-children node "{")))
(beg (treesit-node-start open-bracket))
(beg (1+ beg))
(end (treesit-node-end node))
(end (1- end)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-haskell-function (node offset)
"Define fold range for `function' in Haskell.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(when-let* ((beg (treesit-node-start node))
(beg (treesit-fold--eol beg))
(end-node (treesit-fold-last-child node))
(end (treesit-node-end end-node)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-html (node offset)
"Define fold range for tag in HTML.
For arguments NODE and OFFSET, see function `treesit-fold-range-seq' for
more information."
(let* ((beg (treesit-node-end (treesit-node-child node 0)))
(end-node (treesit-fold-last-child node))
(end (treesit-node-start end-node)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-julia-function (node offset)
"Return the fold range for a NODE in Julia.
It excludes the NODE's first child and the `end' keyword. For
argument OFFSET, see function `treesit-fold-range-seq' for more
information."
(when-let* ((identifier (treesit-node-child node 0 t))
(params (treesit-node-child node 1 t))
(beg (treesit-node-end params))
(end (treesit-node-end node))
(end (- end 3)))
(when treesit-fold-on-next-line ; display nicely
(setq end (treesit-fold--last-eol end)))
(treesit-fold--cons-add (cons beg end) offset)))
(defun treesit-fold-range-julia-if (node offset)
"Define fold range for if statement in Julia.