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44 lines
1.7 KiB
Racket
44 lines
1.7 KiB
Racket
#lang racket/base
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(require pollen/setup
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scribble/reader
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racket/pretty
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version/utils
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racket/port
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racket/string
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txexpr/base)
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(provide show configure current-top-path)
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(define current-top-path (make-parameter #f))
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(define (my-pretty-print x)
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;; #:newline option for `pretty-print` was introduced in 6.6.0.3
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(if (version<? (version) "6.7")
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;; so trim trailing newline manually in earlier versions
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(display (string-trim #:left? #f (with-output-to-string (λ () (pretty-print x))) "\n"))
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(pretty-print #:newline? #f x)))
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(define (my-error-handler exn)
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(error '|pollen markup error| (string-join (cdr (string-split (exn-message exn) ": ")) ": ")))
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(define (show doc parser-mode here-path)
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;; we only want the top doc to print in the runtime environment
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;; otherwise if a Pollen source imports others, they will all print their docs in sequence.
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;; so only print if the current here-path is the top path, which is stored in the `current-top-path` parameter.
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(when (equal? here-path (current-top-path))
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(if (memq parser-mode (list default-mode-preproc default-mode-template))
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(display doc)
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(with-handlers ([exn:fail? my-error-handler])
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(my-pretty-print (validate-txexpr doc))))))
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(define (configure top-here-path)
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(current-top-path top-here-path) ; puts `show` into the right mode
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(define old-read (current-read-interaction))
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(define (pollen-repl-read src in)
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;; wrap repl interactions with pollen expression support
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(define pollen-readtable (make-at-readtable #:command-char (setup:command-char)))
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(parameterize ([current-readtable pollen-readtable])
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(old-read src in)))
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(current-read-interaction pollen-repl-read))
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