editors syntax highlighting ...

- emacs syntax: add tree-sitter major mode for SiSU spine markup
  New file sisu-spine-ts-mode.el is a sibling of the existing regex
  mode, backed by Emacs 29+'s built-in treesit.el and the
  tree-sitter-sisu grammar. It replaces the long font-lock keyword list
  with treesit-font-lock-rules grouped into eight features (comment,
  header, heading, block, inline, note, link, index, misc) so users
  can dial verbosity via treesit-font-lock-level. It also wires up:
  - treesit-simple-imenu-settings for a heading outline,
  - treesit-thing-settings for sentence / paragraph motions,
  - treesit-defun-type-regexp so C-M-a / C-M-e jump heading-to-heading,
  - a sisu-spine-ts-install-grammar command that registers
    treesit-language-source-alist and runs
    treesit-install-language-grammar so users can install the parser
    from inside Emacs without leaving the editor.

- the original sisu-spine-mode.el is unchanged and supported for
  Emacs < 29 and for users who prefer regex highlighting.

- nvim drop-in: point parser fetch at tools/tree-sitter-sisu
  sundry/editor-syntax-etc/nvim/
  The nvim-treesitter install_info now fetches the parser from
  https://git.sisudoc.org/projects/tree-sitter-sisu which can be cloned
  via git://git.sisudoc.org/tools/tree-sitter-sisu The fetched paths:
    files = { "src/parser.c", "src/scanner.c" }
  submission of the sisu parser to nvim-treesitter's parsers.lua should
  be a near-trivial one-liner.

- the original vim regex highlighter remains as before
  - sundry/editor-syntax-etc/vim/syntax/sisu-spine.vim
  - sundry/editor-syntax-etc/vim/templates/{sst,ssm,ssi}.tpl
    new skeleton templates for the three SiSU markup file types
    sets up the YAML header (title, creator, date, rights, classify,
    identfier)

- .gitignore - whitelist the new files

(assisted by Claude-Code)

1 files changed, 21 insertions, 3 deletions

diff --git a/sundry/editor-syntax-etc/emacs/sisu-spine-mode-autoloads.el b/sundry/editor-syntax-etc/emacs/sisu-spine-mode-autoloads.el
index 4cc6332..098a28c 100644
--- a/sundry/editor-syntax-etc/emacs/sisu-spine-mode-autoloads.el
+++ b/sundry/editor-syntax-etc/emacs/sisu-spine-mode-autoloads.el
@@ -1,10 +1,28 @@
 (add-to-list 'load-path (or (file-name-directory #$) (car load-path)))
+;; Regex / font-lock major mode.  Fallback for Emacs < 29 and for users
+;; who have not installed the tree-sitter-sisu parser.
 (autoload 'sisu-spine-mode "sisu-spine-mode" "\
 Major mode for editing SiSU (spine) markup files.
 SiSU (https://www.sisudoc.org/) document structuring, publishing
 and search.
 
 \(fn)" t nil)
-(add-to-list 'auto-mode-alist '("\\.sst\\'" . sisu-spine-mode))
-(add-to-list 'auto-mode-alist '("\\.ssm\\'" . sisu-spine-mode))
-(add-to-list 'auto-mode-alist '("\\.ssi\\'" . sisu-spine-mode))
+
+;; Tree-sitter major mode (Emacs 29+).  When the parser is installed it
+;; is selected by `auto-mode-alist'; otherwise the regex mode is used.
+(autoload 'sisu-spine-ts-mode "sisu-spine-ts-mode" "\
+Tree-sitter major mode for editing SiSU (spine) markup files.
+
+\(fn)" t nil)
+(autoload 'sisu-spine-ts-install-grammar "sisu-spine-ts-mode" "\
+Install the tree-sitter-sisu grammar for `sisu-spine-ts-mode'.
+\(fn)" t nil)
+(defun sisu-spine-auto-mode ()
+  "Choose `sisu-spine-ts-mode' if the parser is installed, else fall back."
+  (if (and (fboundp 'treesit-ready-p) (treesit-ready-p 'sisu t))
+    (sisu-spine-ts-mode)
+  (sisu-spine-mode)))
+
+(add-to-list 'auto-mode-alist '("\\.sst\\'" . sisu-spine-auto-mode))
+(add-to-list 'auto-mode-alist '("\\.ssm\\'" . sisu-spine-auto-mode))
+(add-to-list 'auto-mode-alist '("\\.ssi\\'" . sisu-spine-auto-mode))