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treesit-fold-summary.el
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;;; treesit-fold-summary.el --- Extract summary from fold region -*- lexical-binding: t; -*-
;; Copyright (C) 2021-2025 Shen, Jen-Chieh
;; Created date 2021-10-04 16:59:22
;; 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:
;;
;; Extract summary from fold region.
;;
;;; Code:
(require 'mule-util)
(require 'treesit-fold-util)
(defcustom treesit-fold-summary-show t
"Flag to show summary if available."
:type 'boolean
:group 'treesit-fold)
(defcustom treesit-fold-summary-max-length 60
"Maximum length for summary to display."
:type '(choice (const :tag "nil" nil)
(integer :tag "positive integer number"))
:group 'treesit-fold)
(defcustom treesit-fold-summary-format " <S> %s "
"Prefix string added before summary overlay."
:type 'string
:group 'treesit-fold)
;;
;; (@* "Externals" )
;;
(defvar treesit-fold-replacement-face)
;;
;; (@* "Parsers" )
;;
(defun treesit-fold-summary--valid-content-p (content)
"Return non-nil if CONTENT is a valid document string for extraction.
Some programmers use some type of characters for splitting the code module
into sections. For instance, ===, ---, ///, =-=, etc. Try to omit these
type of content by checking the word boundary's existence."
(string-match-p "\\w" content))
(defun treesit-fold-summary--apply-sym (line sym)
"Remove SYM from LINE."
(when (string-prefix-p sym line)
(setq line (substring line (length sym) (length line))
line (string-trim line)))
line)
(defun treesit-fold-summary--extract-summary (doc-str sym)
"Extract only document summary from DOC-STR using SYM."
(let ((lines (split-string doc-str "\n")) new-lines)
(dolist (line lines)
(setq line (string-trim line))
(cond ((listp sym)
(dolist (c sym) (setq line (treesit-fold-summary--apply-sym line c))))
(t (setq line (treesit-fold-summary--apply-sym line sym))))
(when (treesit-fold-summary--valid-content-p line) (push line new-lines)))
(reverse new-lines)))
(defun treesit-fold-summary--doc-extract (doc-str sym)
"Default way to extract the doc summary from DOC-STR using SYM."
(let* ((lines (treesit-fold-summary--extract-summary doc-str sym)) (summary (nth 0 lines)))
(when summary (setq summary (string-trim summary)))
(if (string-empty-p summary) nil summary)))
(defun treesit-fold-summary--generic (doc-str sym)
"Generic DOC-STR extraction using SYM."
(when (treesit-fold--doc-faces-p doc-str)
(treesit-fold-summary--doc-extract doc-str sym)))
(defun treesit-fold-summary-batch (doc-str)
"Extract summary from DOC-STR in Batch."
(treesit-fold-summary--generic doc-str '("::" "rem" "REM")))
(defun treesit-fold-summary-csharp-vsdoc (doc-str)
"Extract summary from DOC-STR in C# vsdoc."
(let ((type-triple (string-match-p "///" doc-str)))
(setq doc-str (replace-regexp-in-string "<[/]*[^>]+." "" doc-str))
(treesit-fold-summary--generic doc-str (if type-triple "///" "//"))))
(defun treesit-fold-summary-csharp (doc-str)
"Extract summary from DOC-STR in C#."
(cond ((string-match-p "///" doc-str)
(treesit-fold-summary-csharp-vsdoc doc-str))
(t (treesit-fold-summary-javadoc doc-str))))
(defun treesit-fold-summary-elisp (doc-str)
"Extract summary from DOC-STR in Elisp."
(treesit-fold-summary--generic doc-str ";;"))
(defun treesit-fold-summary-javadoc (doc-str)
"Extract summary from DOC-STR in Javadoc."
(treesit-fold-summary--generic doc-str "*"))
(defun treesit-fold-summary-go (doc-str)
"Extract summary from DOC-STR in Go."
(treesit-fold-summary--generic doc-str "//"))
(defun treesit-fold-summary-lua-doc (doc-str)
"Extract summary from DOC-STR in Lua."
(treesit-fold-summary--generic doc-str "--"))
(defun treesit-fold-summary-pascal-doc (doc-str)
"Extract summary from DOC-STR in Pascal."
(cond ((string-prefix-p "{" doc-str)
(treesit-fold-summary--generic doc-str '("{" "}")))
(t (treesit-fold-summary-go doc-str))))
(defun treesit-fold-summary-python-doc (doc-str)
"Extract summary from DOC-STR in Python."
(treesit-fold-summary--generic doc-str "\"\"\""))
(defun treesit-fold-summary-rst-doc (doc-str)
"Extract summary from DOC-STR in reStructuredText."
(treesit-fold-summary--generic doc-str ".."))
(defun treesit-fold-summary-ruby-doc (doc-str)
"Extract summary from DOC-STR in Ruby."
(treesit-fold-summary--generic doc-str "#"))
(defun treesit-fold-summary-rust-doc (doc-str)
"Extract summary from DOC-STR in Rust."
(treesit-fold-summary--generic doc-str "///"))
(defun treesit-fold-summary-tex-doc (doc-str)
"Extract summary from DOC-STR in Tex family."
(treesit-fold-summary--generic doc-str "%"))
(defun treesit-fold-summary-c-macro (doc-str)
"Parse C macro summary from DOC-STR."
(when (treesit-fold--is-face doc-str
'( font-lock-preprocessor-face
preproc-font-lock-preprocessor-background))
(treesit-fold-summary--doc-extract doc-str "")))
(defun treesit-fold-summary-c (doc-str)
"Extract summary from DOC-STR in C comment."
(or (treesit-fold-summary-javadoc doc-str)
(treesit-fold-summary-c-macro doc-str)))
(defun treesit-fold-summary-markdown (doc-str)
"Extract summary from DOC-STR in Markdown block."
(treesit-fold-summary--doc-extract doc-str '("-" "```")))
(defun treesit-fold-summary-matlab-doc (doc-str)
"Extract summary from MATLAB DOC-STR."
(treesit-fold-summary--generic doc-str "%"))
(defun treesit-fold-summary-mermaid (doc-str)
"Extract summary from DOC-STR in Mermaid comment."
(treesit-fold-summary--generic doc-str '("%%")))
(defun treesit-fold-summary-org (doc-str)
"Extract summary from DOC-STR in Org block."
(treesit-fold-summary--doc-extract doc-str '()))
(defun treesit-fold-summary-xml (doc-str)
"Extract summary from DOC-STR in XML."
(treesit-fold-summary--generic doc-str "-"))
(defun treesit-fold-summary-julia-doc (doc-str)
"Extract summary from DOC-STR in Julia."
(treesit-fold-summary--generic doc-str '("#" "\"\"\"")))
;;
;; (@* "Core" )
;;
;; TODO(everyone): keep this alist alphabetically sorted
(defcustom treesit-fold-summary-parsers-alist
`((actionscript-mode . treesit-fold-summary-javadoc)
(arduino-mode . treesit-fold-summary-c)
(asm-mode . treesit-fold-summary-elisp)
(fasm-mode . treesit-fold-summary-elisp)
(masm-mode . treesit-fold-summary-elisp)
(nasm-mode . treesit-fold-summary-elisp)
(gas-mode . treesit-fold-summary-elisp)
(bat-mode . treesit-fold-summary-batch)
(beancount-mode . treesit-fold-summary-elisp)
(c-mode . treesit-fold-summary-c)
(c++-mode . treesit-fold-summary-c)
(cmake-mode . treesit-fold-summary-ruby-doc)
(clojure-mode . treesit-fold-summary-elisp)
(csharp-mode . treesit-fold-summary-csharp)
(css-mode . treesit-fold-summary-javadoc)
(dart-mode . treesit-fold-summary-javadoc)
(editorconfig-conf-mode . treesit-fold-summary-ruby-doc)
(emacs-lisp-mode . treesit-fold-summary-elisp)
(elixir-mode . treesit-fold-summary-ruby-doc)
(erlang-mode . treesit-fold-summary-tex-doc)
(fish-mode . treesit-fold-summary-javadoc)
(gdscript-mode . treesit-fold-summary-ruby-doc)
(glsl-mode . treesit-fold-summary-c)
(go-mode . treesit-fold-summary-go)
(groovy-mode . treesit-fold-summary-javadoc)
(jenkinsfile-mode . treesit-fold-summary-javadoc)
(haskell-mode . treesit-fold-summary-lua-doc)
(haxe-mode . treesit-fold-summary-javadoc)
(heex-mode . treesit-fold-summary-xml)
(hlsl-mode . treesit-fold-summary-c)
(html-mode . treesit-fold-summary-xml)
(jai-mode . treesit-fold-summary-c)
(janet-mode . treesit-fold-summary-ruby-doc)
(java-mode . treesit-fold-summary-javadoc)
(javascript-mode . treesit-fold-summary-javadoc)
(js-mode . treesit-fold-summary-javadoc)
(js2-mode . treesit-fold-summary-javadoc)
(js3-mode . treesit-fold-summary-javadoc)
(json-mode . treesit-fold-summary-javadoc)
(jsonnet-mode . treesit-fold-summary-javadoc)
(julia-mode . treesit-fold-summary-julia-doc)
(kotlin-mode . treesit-fold-summary-javadoc)
(latex-mode . treesit-fold-summary-tex-doc)
(LaTeX-mode . treesit-fold-summary-tex-doc)
(lisp-mode . treesit-fold-summary-elisp)
(lisp-interaction-mode . treesit-fold-summary-elisp)
(llvm-mode . treesit-fold-summary-elisp)
(llvm-mir-mode . treesit-fold-summary-elisp)
(lua-mode . treesit-fold-summary-lua-doc)
(makefile-mode . treesit-fold-summary-ruby-doc)
(makefile-automake-mode . treesit-fold-summary-ruby-doc)
(makefile-gmake-mode . treesit-fold-summary-ruby-doc)
(makefile-makepp-mode . treesit-fold-summary-ruby-doc)
(makefile-bsdmake-mode . treesit-fold-summary-ruby-doc)
(makefile-imake-mode . treesit-fold-summary-ruby-doc)
(markdown-mode . treesit-fold-summary-markdown)
(matlab-mode . treesit-fold-summary-matlab-doc)
(mermaid-mode . treesit-fold-summary-mermaid)
(ninja-mode . treesit-fold-summary-ruby-doc)
(nix-mode . treesit-fold-summary-ruby-doc)
(noir-mode . treesit-fold-summary-rust-doc)
(objc-mode . treesit-fold-summary-c)
(org-mode . treesit-fold-summary-org)
(perl-mode . treesit-fold-summary-ruby-doc)
(php-mode . treesit-fold-summary-javadoc)
(pascal-mode . treesit-fold-summary-pascal-doc)
(python-mode . treesit-fold-summary-python-doc)
(qss-mode . treesit-fold-summary-css)
(rjsx-mode . treesit-fold-summary-javadoc)
(rst-mode . treesit-fold-summary-rst-doc)
(ruby-mode . treesit-fold-summary-ruby-doc)
(rust-mode . treesit-fold-summary-rust-doc)
(scala-mode . treesit-fold-summary-javadoc)
(scheme-mode . treesit-fold-summary-elisp)
(sh-mode . treesit-fold-summary-javadoc)
(sql-mode . treesit-fold-summary-c)
(svelte-mode . treesit-fold-summary-xml)
(swift-mode . treesit-fold-summary-c)
(tablegen-mode . treesit-fold-summary-javadoc)
(toml-mode . treesit-fold-summary-javadoc)
(conf-toml-mode . treesit-fold-summary-javadoc)
(typescript-mode . treesit-fold-summary-javadoc)
(verilog-mode . treesit-fold-summary-javadoc)
(vhdl-mode . treesit-fold-summary-lua-doc)
(nxml-mode . treesit-fold-summary-xml)
(yaml-mode . treesit-fold-summary-ruby-doc)
(k8s-mode . treesit-fold-summary-ruby-doc)
(zig-mode . treesit-fold-summary-go))
"Alist mapping `major-mode' to doc parser function."
:type '(alist :key-type symbol :value-type function)
:group 'treesit-fold)
(defun treesit-fold-summary--keep-length (summary)
"Keep the SUMMARY length to `treesit-fold-summary-max-length'."
(let ((len-sum (length summary)))
(when (< treesit-fold-summary-max-length len-sum)
(setq summary (truncate-string-to-width summary
treesit-fold-summary-max-length
0 nil
t))))
summary)
(defun treesit-fold-summary--apply-format (summary)
"Return the SUMMARY that has added the summary prefix."
(format treesit-fold-summary-format summary))
(defun treesit-fold-summary--parser ()
"Return the summary parser from `treesit-fold-summary-parsers-alist'."
(assoc (buffer-local-value 'major-mode (current-buffer)) treesit-fold-summary-parsers-alist))
(defun treesit-fold-summary--get (doc-str)
"Extract summary from DOC-STR in order to display ontop of the overlay."
(let ((parser (cdr (treesit-fold-summary--parser))) summary
(map (make-sparse-keymap)))
(keymap-set map "<mouse-1>" #'treesit-fold-open)
(when parser
(setq summary (funcall parser doc-str))
(when (integerp treesit-fold-summary-max-length)
(setq summary (treesit-fold-summary--keep-length summary)))
(when summary
(setq summary (treesit-fold-summary--apply-format summary)
summary (propertize summary 'face 'treesit-fold-replacement-face
'mouse-face 'treesit-fold-replacement-mouse-face
'keymap map))))
summary))
(provide 'treesit-fold-summary)
;;; treesit-fold-summary.el ends here