runtime-config

dev-stylish
Matthew Butterick 6 years ago
parent d2fe2073f0
commit 8ad4eb1180

@ -1,35 +1,43 @@
#lang racket/base
(require pollen/setup scribble/reader racket/pretty version/utils racket/port racket/string)
(provide (all-defined-out))
(require pollen/setup
scribble/reader
racket/pretty
version/utils
racket/port
racket/string
txexpr/base)
(provide show configure current-top-path)
(define current-top-path (make-parameter #f))
(define (my-pretty-print x)
;; #:newline option for `pretty-print` was introduced in 6.6.0.3
(if (version<? (version) "6.7")
;; so trim trailing newline manually in earlier versions
(display (string-trim #:left? #f (with-output-to-string (λ () (pretty-print x))) "\n"))
(pretty-print #:newline? #f x)))
(define (my-error-handler exn)
(error '|pollen markup error| (string-join (cdr (string-split (exn-message exn) ": ")) ": ")))
(define (show doc parser-mode here-path)
;; we only want the top doc to print in the runtime environment
;; otherwise if a Pollen source imports others, they will all print their docs in sequence.
;; so only print if the current here-path is the top path, which is stored in the `current-top-path` parameter.
(let ([ctp (current-top-path)])
(when (and ctp (equal? here-path ctp))
(when (equal? here-path (current-top-path))
(if (memq parser-mode (list default-mode-preproc default-mode-template))
(display doc)
;; #:newline option for `pretty-print` was introduced in 6.6.0.3,
;; so trim trailing newline manually
(let ([pretty-print-proc (if (version<? (version) "6.7")
(λ (x) (display (string-trim #:left? #f (with-output-to-string (λ () (pretty-print x))) "\n")))
(λ (x) (pretty-print #:newline? #f x)))])
;; OK to use dynamic-require because runtime-config itself is dynamic-required
(pretty-print-proc (with-handlers ([exn:fail? (λ (exn) ((error '|pollen markup error|
((dynamic-require 'racket/string 'string-join) (cdr ((dynamic-require 'racket/string 'string-split) (exn-message exn) ": ")) ": "))))])
((dynamic-require 'txexpr/base 'validate-txexpr) doc))))))))
(with-handlers ([exn:fail? my-error-handler])
(my-pretty-print (validate-txexpr doc))))))
(define (configure top-here-path)
(current-top-path top-here-path) ;; puts `show` into the right mode
;; wrap REPL interactions with pollen expression support
(current-top-path top-here-path) ; puts `show` into the right mode
(define old-read (current-read-interaction))
(define (pollen-repl-read src in)
;; wrap repl interactions with pollen expression support
(define pollen-readtable (make-at-readtable #:command-char (setup:command-char)))
(define (new-read src in)
(parameterize ([current-readtable pollen-readtable])
(old-read src in)))
(current-read-interaction new-read))
(current-read-interaction pollen-repl-read))

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