;; content-on-sx — Markdown render mode.
;;
;; A third boundary format alongside asHTML / asSx, via the same polymorphic
;; dispatch. The newline is supplied by the boundary as a keyword arg
;; (asMarkdown: nl) because this Smalltalk dialect has no Character newline
;; constructor — blocks that need internal newlines (code, lists, doc) use it.
;;
;; No Markdown escaping yet (Markdown's escaping rules differ from HTML); raw
;; text is emitted. Ordered lists emit "1." for every item (Markdown renumbers).
;;
;; Requires (loaded by harness): block.sx, doc.sx.

(define
  content-bootstrap-markdown!
  (fn
    ()
    (begin
      (ct-def-method!
        "CtHeading"
        "asMarkdown:"
        "asMarkdown: nl | h i | h := ''. i := 0. [i < level] whileTrue: [h := h , '#'. i := i + 1]. ^ h , ' ' , text")
      (ct-def-method! "CtText" "asMarkdown:" "asMarkdown: nl ^ text")
      (ct-def-method!
        "CtCode"
        "asMarkdown:"
        "asMarkdown: nl ^ '```' , language , nl , text , nl , '```'")
      (ct-def-method! "CtQuote" "asMarkdown:" "asMarkdown: nl ^ '> ' , text")
      (ct-def-method!
        "CtImage"
        "asMarkdown:"
        "asMarkdown: nl ^ '![' , alt , '](' , src , ')'")
      (ct-def-method!
        "CtEmbed"
        "asMarkdown:"
        "asMarkdown: nl ^ '[embed](' , url , ')'")
      (ct-def-method! "CtDivider" "asMarkdown:" "asMarkdown: nl ^ '---'")
      (ct-def-method!
        "CtList"
        "asMarkdown:"
        "asMarkdown: nl | mark | mark := ordered ifTrue: ['1. '] ifFalse: ['- ']. ^ (items inject: '' into: [:a :x | a , (a = '' ifTrue: [''] ifFalse: [nl]) , mark , x])")
      (ct-def-method!
        "CtDoc"
        "asMarkdown:"
        "asMarkdown: nl ^ (blocks inject: '' into: [:a :b | a , (a = '' ifTrue: [''] ifFalse: [nl , nl]) , (b asMarkdown: nl)])")
      true)))

(define ct-nl (str "\n"))

;; ── SX boundary ──
(define
  asMarkdown
  (fn (node) (str (st-send node "asMarkdown:" (list ct-nl)))))
(define content/markdown asMarkdown)
(define render-markdown asMarkdown)
(define block-markdown asMarkdown)