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, 140 insertions, 0 deletions

diff --git a/sundry/editor-syntax-etc/nvim/queries/sisu/textobjects.scm b/sundry/editor-syntax-etc/nvim/queries/sisu/textobjects.scm
new file mode 100644
index 0000000..0a82481
--- /dev/null
+++ b/sundry/editor-syntax-etc/nvim/queries/sisu/textobjects.scm
@@ -0,0 +1,140 @@
+; Text-object queries for SiSU Spine markup.
+;
+; Capture conventions follow nvim-treesitter/textobjects:
+;   @<thing>.outer  -> select including delimiters / surrounding whitespace
+;   @<thing>.inner  -> select content only
+;
+; Hosts that consume these (Neovim's nvim-treesitter-textobjects, Helix,
+; Emacs treesit) bind keys such as `af` / `if` to .outer / .inner.
+
+; =================================================================
+; Headings (sectioning units)
+; =================================================================
+; A whole heading line is a "section header" object. Heading sections
+; (the heading plus its body content up to the next heading of equal or
+; higher level) are not directly expressible in tree-sitter without
+; additional grammar work; hosts can synthesise that from these captures.
+
+(heading_part) @class.outer
+(heading_part
+  content: (heading_content) @class.inner)
+
+(heading_segment) @class.outer
+(heading_segment
+  content: (heading_content) @class.inner)
+
+; =================================================================
+; Block elements (code / poem / block / group / table / quote)
+; =================================================================
+; Whole block including delimiters; raw_content is the inner.
+
+(code_block_curly) @function.outer
+(code_block_curly
+  content: (raw_content) @function.inner)
+
+(code_block_tic) @function.outer
+(code_block_tic
+  content: (raw_content) @function.inner)
+
+(poem_block_curly) @function.outer
+(poem_block_curly
+  content: (raw_content) @function.inner)
+
+(poem_block_tic) @function.outer
+(poem_block_tic
+  content: (raw_content) @function.inner)
+
+(block_block_curly) @function.outer
+(block_block_curly
+  content: (raw_content) @function.inner)
+
+(block_block_tic) @function.outer
+(block_block_tic
+  content: (raw_content) @function.inner)
+
+(group_block_curly) @function.outer
+(group_block_curly
+  content: (raw_content) @function.inner)
+
+(group_block_tic) @function.outer
+(group_block_tic
+  content: (raw_content) @function.inner)
+
+(table_block_curly) @function.outer
+(table_block_curly
+  content: (raw_content) @function.inner)
+
+(table_block_tic) @function.outer
+(table_block_tic
+  content: (raw_content) @function.inner)
+
+(quote_block_tic) @function.outer
+(quote_block_tic
+  content: (raw_content) @function.inner)
+
+(pipe_table) @function.outer
+
+; =================================================================
+; Footnotes and editor notes
+; =================================================================
+; Both share the same outer/inner shape; the inner skips the markers and
+; closing delimiters.
+
+(footnote) @comment.outer
+(footnote
+  (_)+ @comment.inner)
+
+(editor_note) @comment.outer
+(editor_note
+  (_)+ @comment.inner)
+
+; =================================================================
+; Links and images
+; =================================================================
+
+(link) @parameter.outer
+(link
+  text: (link_text) @parameter.inner)
+
+(image) @parameter.outer
+(image
+  spec: (image_spec) @parameter.inner)
+
+; =================================================================
+; Paragraph / inline-formatting runs
+; =================================================================
+
+(paragraph) @block.outer
+(paragraph
+  (_)+ @block.inner)
+
+; Inline formatting pairs - useful as fine-grained text objects.
+; The same delimiter character pattern (e.g. `*{` / `}*`) opens and
+; closes each, so .inner is everything between them.
+
+(emphasis)         @assignment.outer
+(bold)             @assignment.outer
+(italic)           @assignment.outer
+(underline)        @assignment.outer
+(citation_mark)    @assignment.outer
+(superscript)      @assignment.outer
+(subscript)        @assignment.outer
+(inserted)         @assignment.outer
+(strikethrough)    @assignment.outer
+(monospace_inline) @assignment.outer
+
+; =================================================================
+; Book index entries
+; =================================================================
+
+(book_index) @attribute.outer
+(book_index
+  (index_content) @attribute.inner)
+
+; =================================================================
+; Header fields
+; =================================================================
+
+(header_field) @assignment.outer
+(header_field
+  value: (header_value) @assignment.inner)