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#lang racket/base
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(provide (except-out (all-from-out racket/base) #%module-begin)
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(rename-out [new-module-begin #%module-begin]))
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(define-syntax-rule (new-module-begin body-exprs ...)
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(#%module-begin
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(module inner pollen/lang/doclang_raw
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;; first three lines are positional arguments for doclang_raw
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main-raw ; id of export
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(λ(x) x) ; post-process function
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() ; prepended exprs
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(require pollen/lang/lang-helper)
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(require-project-require-files)
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(provide (all-defined-out))
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;; Change behavior of undefined identifiers
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(require pollen/top)
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(provide (all-from-out pollen/top))
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;; Build 'inner-here-path and 'inner-here
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(define inner-here-path (get-here-path))
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(require (only-in pollen/world PROJECT_ROOT))
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(require (only-in racket/path find-relative-path))
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(require (only-in pollen/file-tools ->output-path))
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(define inner-here (path->string (->output-path (find-relative-path PROJECT_ROOT inner-here-path))))
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body-exprs ...)
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(require 'inner)
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;; Split out the metas. We want to catch user-defined metas too.
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;; First, append "here-path" and "here" as metas.
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;; Because they might have been overridden by custom metas in the source.
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(require txexpr)
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(define one-with-everything `(placeholder-root
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(meta "here-path" ,inner-here-path)
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(meta "here" ,inner-here)
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,@(cdr main-raw))) ;; cdr strips initial linebreak
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(define is-meta-element? (λ(x) (and (txexpr? x) (equal? 'meta (get-tag x)))))
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(define-values (main-without-metas meta-elements)
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(splitf-txexpr one-with-everything is-meta-element?))
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(define meta-element->assoc (λ(x) (cons (cadr x) (caddr x))))
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(define metas (make-hash (map meta-element->assoc meta-elements)))
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;; set up the 'main export
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(define here-ext (car (regexp-match #px"\\w+$" inner-here-path)))
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(define wants-decoder? (member here-ext (list "pd" "ptree")))
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(define main (apply (if wants-decoder?
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;; 'root is the hook for the decoder function.
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;; If it's not a defined identifier, it just hits #%top and becomes `(root ,@body ...)
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root
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;; for textual (preprocessor-style) output. Converts x-expressions to HTML.
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(λ xs (apply string-append (map (dynamic-require 'xml 'xexpr->string) xs))))
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(cdr main-without-metas))) ;; cdr strips placeholder-root tag
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;; derive 'here & 'here-path from the hash (because they might have been overridden in the source)
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(define here (hash-ref metas "here"))
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(define here-path (hash-ref metas "here-path"))
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(provide metas main here here-path
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;; hide the exports that were only for internal use.
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(except-out (all-from-out 'inner) inner-here inner-here-path main-raw #%top))
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;; for output in DrRacket
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(module+ main
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(if wants-decoder?
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(print main)
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(display main)))))
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