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typesetting/quad/quadwriter/lang-helper.rkt

98 lines
3.8 KiB
Racket

#lang debug racket/base
(require (for-syntax racket/base)
racket/match
pollen/tag
racket/system
racket/class
syntax/strip-context
scribble/reader
quadwriter/core
txexpr)
(provide (all-defined-out))
(define q (default-tag-function 'q))
(define ((make-read-syntax expander-mod pt-proc) path-string p)
(strip-context
(with-syntax ([PATH-STRING path-string]
[PT (pt-proc path-string p)]
[EXPANDER-MOD expander-mod])
#'(module _ EXPANDER-MOD
PATH-STRING
. PT))))
(define-syntax-rule (make-module-begin DOC-PROC)
(begin
(provide (rename-out [new-module-begin #%module-begin]))
(define-syntax (new-module-begin stx)
(syntax-case stx ()
[(_ PATH-STRING . EXPRS)
(with-syntax ([DOC (datum->syntax #'PATH-STRING 'doc)]
[VIEW-RESULT (datum->syntax #'PATH-STRING 'view-result)])
#'(#%module-begin
(provide DOC VIEW-RESULT)
(define DOC (DOC-PROC (list . EXPRS)))
(define pdf-path (path-string->pdf-path 'PATH-STRING))
(define (VIEW-RESULT)
(define open-string
(case (system-type 'os)
[(macosx) "open ~a"]
[(windows) "start ~a"]
[(unix) "xdg-open ~a &> /dev/null"]
[else (error "Don't know how to open PDF file.")]))
(when (file-exists? pdf-path)
(void (system (format open-string pdf-path)))))
(module+ main
(render-pdf DOC pdf-path))))]))))
(define (path-string->pdf-path path-string)
(match (format "~a" path-string)
;; weird test but sometimes DrRacket calls the unsaved file
;; 'unsaved-editor and sometimes "unsaved editor"
[(regexp #rx"unsaved.editor")
(build-path (find-system-path 'desk-dir) "untitled.pdf")]
[_ (path-replace-extension path-string #".pdf")]))
(define quad-at-reader (make-at-reader
#:syntax? #t
#:inside? #t
#:command-char #\◊))
(define (xexpr->parse-tree x)
;; an ordinary txexpr can't serve as a parse tree because of the attrs list fails when passed to #%app.
;; so stick an `attr-list` identifier on it which can hook into the expander.
;; sort of SXML-ish.
(let loop ([x x])
(match x
[(txexpr tag attrs elems) (list* tag (cons 'attr-list attrs) (map loop elems))]
[(? list? xs) (map loop xs)]
[_ x])))
(define (get-info in mod line col pos)
;; DrRacket caches source file information per session,
;; so we can do the same to avoid multiple searches for the command char.
(define command-char-cache (make-hash))
(define my-command-char #\◊)
(λ (key default)
(case key
[(color-lexer)
(match (dynamic-require 'syntax-color/scribble-lexer 'make-scribble-inside-lexer (λ () #false))
[(? procedure? make-lexer) (make-lexer #:command-char my-command-char)]
[_ default])]
[(drracket:toolbar-buttons)
(match (dynamic-require 'pollen/private/drracket-buttons 'make-drracket-buttons (λ () #false))
[(? procedure? make-buttons) (make-buttons my-command-char)])]
[(drracket:indentation)
(λ (text pos)
(define line-idx (send text position-line pos))
(define line-start-pos (send text line-start-position line-idx))
(define line-end-pos (send text line-end-position line-idx))
(define first-vis-pos
(or
(for/first ([pos (in-range line-start-pos line-end-pos)]
#:unless (char-blank? (send text get-character pos)))
pos)
line-start-pos))
(- first-vis-pos line-start-pos))]
[else default])))