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pollen/highlight.rkt

194 lines
7.6 KiB
Racket

#lang rackjure/base
(require racket/function
racket/match
racket/port
racket/runtime-path
racket/system
racket/string
rackjure/threading
rackjure/str
xml
(only-in html read-html-as-xml)
pollen/debug)
(provide highlight make-highlight-css)
#|
A small edit of Greg Hendershott's pygments.rkt,
part of Frog, the static-blog generator
http://github.com/greghendershott/frog
YOU MUST HAVE PYGMENTS INSTALLED ALREADY!
sudo easy_install --upgrade Pygments
Sample usage in test.html.pm:
◊(require pollen/highlight)
◊(make-highlight-css)
; specify language in square brackets
; put code in curly brackets
◊highlight['python]{
for x in range(10):
print x
if zero is False:
print "Hello world"}
|#
(define current-pygments-linenos? (make-parameter #t))
(define current-pygments-cssclass (make-parameter "source"))
(define (decode-ampersands-in-attributes x)
(match x
[`(,tag ([,ks ,vs] ...) . ,els)
`(,tag
,(for/list ([k (in-value ks)]
[v (in-value vs)])
(list k (regexp-replace* "&" v "\\&")))
,@(map decode-ampersands-in-attributes els))]
[v v]))
(define (read-html-as-xexprs) ;; (-> (listof xexpr?))
(~>> (read-html-as-xml)
(element #f #f 'root '())
xml->xexpr
decode-ampersands-in-attributes
cddr))
;; Go ahead during module load and start a thread to launch the
;; subprocess that runs Python with our pipe.py script.
(define-runtime-path pipe.py "pipe.py")
(define-values (pyg-in pyg-out pyg-pid pyg-err pyg-proc)
(values #f #f #f #f #f))
(define (make-pygments-thread)
(thread
(thunk
;; Start a subprocess running our pipe.py script.
(match (process (str "python -u " pipe.py
(if (current-pygments-linenos?) " --linenos" "")
" --cssclass " (current-pygments-cssclass)))
[(list in out pid err proc)
(set!-values (pyg-in pyg-out pyg-pid pyg-err pyg-proc)
(values in out pid err proc))
(file-stream-buffer-mode out 'line)])
;; Wait for its "ready\n"
(when (sync/timeout 3 pyg-in)
(read-line pyg-in 'linefeed)))))
(define load-thread #t)
(define (pygments-running?)
(define (pygments-status-is-running?)
(and pyg-proc
(eq? (pyg-proc 'status) 'running)))
(when load-thread ;; first time
(thread-wait (make-pygments-thread))
(set! load-thread #f)
(unless (pygments-status-is-running?)
(message "Pygments not installed. Using plain `pre` blocks.")))
(pygments-status-is-running?))
(define (stop) ;; -> void
(when (pygments-running?)
(displayln "__EXIT__" pyg-out)
(begin0 (or (pyg-proc 'exit-code) (pyg-proc 'kill))
(close-input-port pyg-in)
(close-output-port pyg-out)
(close-input-port pyg-err)))
(void))
(exit-handler
(let ([old-exit-handler (exit-handler)])
(lambda (v)
(stop)
(old-exit-handler v))))
(define (highlight lang . codelines)
(define code (string-append* codelines))
(define (default code)
`((pre () (code () ,code))))
(define result
`(div ((class "highlight"))
,@(cond [(pygments-running?)
(displayln lang pyg-out)
(displayln code pyg-out)
(displayln "__END__" pyg-out)
(let loop ([s ""])
(match (read-line pyg-in 'any)
["__END__" (with-input-from-string s read-html-as-xexprs)]
[(? string? v) (loop (str s v "\n"))]
[_ (copy-port pyg-err (current-output-port)) ;echo error msg
(default code)]))]
[else (default code)])))
result)
;; Other CSS options available from http://richleland.github.io/pygments-css/
(define (make-highlight-css) '(style ((type "text/css"))
".highlight .hll { background-color: #ffffcc }
.highlight { background: #f8f8f8; }
.highlight .c { color: #408080; font-style: italic } /* Comment */
.highlight .err { border: 1px solid #FF0000 } /* Error */
.highlight .k { color: #008000; font-weight: bold } /* Keyword */
.highlight .o { color: #666666 } /* Operator */
.highlight .cm { color: #408080; font-style: italic } /* Comment.Multiline */
.highlight .cp { color: #BC7A00 } /* Comment.Preproc */
.highlight .c1 { color: #408080; font-style: italic } /* Comment.Single */
.highlight .cs { color: #408080; font-style: italic } /* Comment.Special */
.highlight .gd { color: #A00000 } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gr { color: #FF0000 } /* Generic.Error */
.highlight .gh { color: #000080; font-weight: bold } /* Generic.Heading */
.highlight .gi { color: #00A000 } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #000080; font-weight: bold } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #800080; font-weight: bold } /* Generic.Subheading */
.highlight .gt { color: #0044DD } /* Generic.Traceback */
.highlight .kc { color: #008000; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008000; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008000; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008000 } /* Keyword.Pseudo */
.highlight .kr { color: #008000; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #B00040 } /* Keyword.Type */
.highlight .m { color: #666666 } /* Literal.Number */
.highlight .s { color: #BA2121 } /* Literal.String */
.highlight .na { color: #7D9029 } /* Name.Attribute */
.highlight .nb { color: #008000 } /* Name.Builtin */
.highlight .nc { color: #0000FF; font-weight: bold } /* Name.Class */
.highlight .no { color: #880000 } /* Name.Constant */
.highlight .nd { color: #AA22FF } /* Name.Decorator */
.highlight .ni { color: #999999; font-weight: bold } /* Name.Entity */
.highlight .ne { color: #D2413A; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0000FF } /* Name.Function */
.highlight .nl { color: #A0A000 } /* Name.Label */
.highlight .nn { color: #0000FF; font-weight: bold } /* Name.Namespace */
.highlight .nt { color: #008000; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #19177C } /* Name.Variable */
.highlight .ow { color: #AA22FF; font-weight: bold } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mf { color: #666666 } /* Literal.Number.Float */
.highlight .mh { color: #666666 } /* Literal.Number.Hex */
.highlight .mi { color: #666666 } /* Literal.Number.Integer */
.highlight .mo { color: #666666 } /* Literal.Number.Oct */
.highlight .sb { color: #BA2121 } /* Literal.String.Backtick */
.highlight .sc { color: #BA2121 } /* Literal.String.Char */
.highlight .sd { color: #BA2121; font-style: italic } /* Literal.String.Doc */
.highlight .s2 { color: #BA2121 } /* Literal.String.Double */
.highlight .se { color: #BB6622; font-weight: bold } /* Literal.String.Escape */
.highlight .sh { color: #BA2121 } /* Literal.String.Heredoc */
.highlight .si { color: #BB6688; font-weight: bold } /* Literal.String.Interpol */
.highlight .sx { color: #008000 } /* Literal.String.Other */
.highlight .sr { color: #BB6688 } /* Literal.String.Regex */
.highlight .s1 { color: #BA2121 } /* Literal.String.Single */
.highlight .ss { color: #19177C } /* Literal.String.Symbol */
.highlight .bp { color: #008000 } /* Name.Builtin.Pseudo */
.highlight .vc { color: #19177C } /* Name.Variable.Class */
.highlight .vg { color: #19177C } /* Name.Variable.Global */
.highlight .vi { color: #19177C } /* Name.Variable.Instance */
.highlight .il { color: #666666 } /* Literal.Number.Integer.Long */"))