92 lines
3.3 KiB
Racket
Executable File
92 lines
3.3 KiB
Racket
Executable File
#!/usr/bin/env racket
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#lang racket
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(require html xml "ansi-color.rkt" "aoc-lib.rkt")
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;; finds a given element of an xexpr
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(define (find-element el doc)
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(match doc
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[(list (== el) _ ...) doc]
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[(list tag attrs children ...)
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(ormap (curry find-element el) children)]
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[_ #f]))
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(struct style-ast [fg bg fs children] #:transparent)
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;; convert xexpr tree to an ast with lower-level styling
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(define (xexpr->style-ast doc)
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(match doc
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[(? string?) (style-ast #f #f #f doc)]
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[(list 'script _ ...) #f]
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[(list-no-order 'p (list 'span (list-no-order '(class "share")) _ ...) _ ...) #f]
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[(list 'li _ children ...)
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(define out-children (filter identity (map xexpr->style-ast children)))
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(style-ast #f #f #f (cons (style-ast #f #f #f "- ") out-children))]
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[(list tag attrs children ...)
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(define-values [fg bg fs]
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(match* (tag attrs)
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[('main _) (values #f #f #f)]
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[('article _) (values #f #f #f)]
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[('p (list-no-order '(class "day-success") _ ...)) (values 'yellow #f 'bold)]
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[('p _) (values #f #f #f)]
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[('pre _) (values #f #f #f)]
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[('h2 _) (values #f #f 'bold)]
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[('ul _) (values #f #f #f)]
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[('a _) (values 'green #f #f)]
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[('code _) (values 'white 234 #f)]
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[('span _) (values #f #f #f)]
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[('em (list-no-order '(class "star") _ ...)) (values 'yellow #f 'bold)]
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[('em _) (values #f #f 'bold)]
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[(_ _)
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(printf "warning: unhandled ~a ~a\n" tag attrs)
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(#f #f #f)]))
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(define inner-children (filter identity (map xexpr->style-ast children)))
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(define new-children
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(if ((or/c 'h2 'pre 'p) tag)
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(let ([nls (list (style-ast #f #f #f "\n") (style-ast #f #f #f "\n"))])
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(append nls inner-children nls))
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inner-children))
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(style-ast fg bg fs new-children)]))
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(define (output-style-ast ast)
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(define num-newlines (make-parameter #f))
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(define (helper ast [prev-bg ""] [prev-fg ""] [prev-fs ""])
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(match-define (style-ast fg bg fs children) ast)
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(when bg (background-color bg))
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(when fg (foreground-color fg))
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(when fs (font-style fs))
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(match children
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["\n"
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(unless (or (false? (num-newlines)) (>= (num-newlines) 2))
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(num-newlines (add1 (num-newlines)))
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(display "\n"))]
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[(? string? str)
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(num-newlines 0)
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(if (string-contains? str "\n")
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(for ([i (in-naturals)] [line (in-list (string-split (string-trim str "\n") "\n"))])
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(color-display (format (if (zero? i) "~a~a" "\n~a~a") erase-line line)))
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(color-display str))]
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[_ (map (lambda (item) (helper item (or bg prev-bg) (or fg prev-fg) (or fs prev-fs)))
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children)])
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(when prev-bg (background-color prev-bg))
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(when prev-fg (foreground-color prev-fg))
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(when prev-fs (font-style prev-fs)))
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(num-newlines #f)
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(helper ast))
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(command-line
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#:program "get-challenge"
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#:args (day)
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(define in (aoc-fetch-challenge (getenv "AOC_YEAR") day (getenv "AOC_SESSION")))
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(use-html-spec #f)
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(define doc-xmls (read-html-as-xml in))
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(close-input-port in)
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(define doc `(top-element ,@(map xml->xexpr doc-xmls)))
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(define main (find-element 'main doc))
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(define ast (xexpr->style-ast main))
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; (pretty-write ast)
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(output-style-ast ast))
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