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36 lines
2.0 KiB
Racket
36 lines
2.0 KiB
Racket
#lang racket/base
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(require pollen/setup scribble/reader racket/pretty version/utils racket/port racket/string)
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(provide (all-defined-out))
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(define current-top-path (make-parameter #f))
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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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(let ([ctp (current-top-path)])
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(when (and ctp (equal? here-path ctp))
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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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;; #:newline option for `pretty-print` was introduced in 6.6.0.3,
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;; so trim trailing newline manually
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(let ([pretty-print-proc (if (version<? (version) "6.7")
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(λ (x) (display (string-trim #:left? #f (with-output-to-string (λ () (pretty-print x))) "\n")))
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(λ (x) (pretty-print #:newline? #f x)))])
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;; OK to use dynamic-require because runtime-config itself is dynamic-required
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(pretty-print-proc (with-handlers ([exn:fail? (λ (exn) ((error '|pollen markup error|
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((dynamic-require 'racket/string 'string-join) (cdr ((dynamic-require 'racket/string 'string-split) (exn-message exn) ": ")) ": "))))])
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((dynamic-require 'txexpr/base '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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;; wrap REPL interactions with pollen expression support
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(define old-read (current-read-interaction))
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(define pollen-readtable (make-at-readtable #:command-char (setup:command-char)))
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(define (new-read src in)
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(parameterize ([current-readtable pollen-readtable])
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(old-read src in)))
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(current-read-interaction new-read))
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