Re: [racket-users] How to pretty print HTML?

[Matthias Felleisen]

> On May 28, 2017, at 7:37 PM, Zelphir Kaltstahl  
> wrote:
> 
>  did not know about `with-output-to-string` - This means I can get any output 
> of a procedure, which usually prints that right away, into a string, I guess.


Makes for really good unit testing for I/O too. 

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Re: [racket-users] How to pretty print HTML?

[Zelphir Kaltstahl]

On Sunday, May 28, 2017 at 10:20:10 PM UTC+2, Matthias Felleisen wrote:
> I have the impression that you are conflating rendering as an output with 
> representing as a string. So the following code tries to sketch this: 
> 
> (require xml)
> 
> ;; Xexpr -> String 
> (define (xexpr->xml/pretty x) 
>   (with-output-to-string
>(lambda ()
>  (display-xml/content
>   (xexpr->xml x)
> 
> (define x
>   `(html
> (body ((bgcolor "red"))
>   "Hi!" (br) "Bye!")))
> 
> (xexpr->xml/pretty x) ;; turn XML into string with newlines and indentation 
> and all — but see how the IDE renders it in the REPL 
> 
> (displayln (xexpr->xml/pretty x)) ;; print the same string — now the IDE is 
> forced to render the printed output 
> 
> — Matthias
> 
> 
> 
> 
> > On May 28, 2017, at 7:55 AM, Zelphir Kaltstahl  
> > wrote:
> > 
> > I have some HTML code, which I generate using x-expressions:
> > 
> > (string-append DOCTYPE-HTML5
> >   "\n"
> >   (xexpr->string
> >`(html
> >  (body ((bgcolor "red"))
> >"Hi!" (br) "Bye!"
> > 
> > I don't like how the result looks in the source code of the web page 
> > created in this way. I'd like there to be indentation and line breaks, 
> > according to the nesting of the DOM elements.
> > 
> > So far I've found the following links and information:
> > 
> > - https://docs.racket-lang.org/reference/pretty-print.html (I don't know 
> > how to use it, because it has no examples. It also seems more like a 
> > library, which generically can pretty print anything you want, provided you 
> > "configure" is correctly. However, HTML is quite complex, I think, so I'd 
> > not like to rewrite something that already exists elsewhere.)
> > - https://docs.racket-lang.org/xml/ (Here are some mentions of indentation 
> > and newlines, but I need some procedure, which returns it, not displays it 
> > immediately and then "does not let me have it", or is there a way to 
> > somehow redirect output into a value which I can use? For example 
> > `display-xml` seems to do what I need. :)
> > 
> > Ideal might be a keyword parameter for `xexpr->string`, which specifies 
> > whether it should prettify the string or not, but such a thing does not 
> > exist according to the docs.
> > 
> > How can I prettify my HTML output?
> > 
> > (I really don't care about a few bytes more data needing to be sent. This 
> > is not the next Google.)
> > 
> > -- 
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Perfect! Does exactly what I wanted.

It is only that I care how it looks when I open the source code view of a web 
page and all the HTML was on one super long line. I know it does not make a 
difference for how the browser renders things, but it is somewhat annoying for 
myself to know that it is not properly indented etc. in the source of the HTML 
page.

I did not know about `with-output-to-string` - This means I can get any output 
of a procedure, which usually prints that right away, into a string, I guess.

Thanks for your help.

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Re: [racket-users] How to pretty print HTML?

[Matthias Felleisen]

I have the impression that you are conflating rendering as an output with 
representing as a string. So the following code tries to sketch this: 

(require xml)

;; Xexpr -> String 
(define (xexpr->xml/pretty x) 
  (with-output-to-string
   (lambda ()
 (display-xml/content
  (xexpr->xml x)

(define x
  `(html
(body ((bgcolor "red"))
  "Hi!" (br) "Bye!")))

(xexpr->xml/pretty x) ;; turn XML into string with newlines and indentation and 
all — but see how the IDE renders it in the REPL 

(displayln (xexpr->xml/pretty x)) ;; print the same string — now the IDE is 
forced to render the printed output 

— Matthias




> On May 28, 2017, at 7:55 AM, Zelphir Kaltstahl  
> wrote:
> 
> I have some HTML code, which I generate using x-expressions:
> 
> (string-append DOCTYPE-HTML5
>   "\n"
>   (xexpr->string
>`(html
>  (body ((bgcolor "red"))
>"Hi!" (br) "Bye!"
> 
> I don't like how the result looks in the source code of the web page created 
> in this way. I'd like there to be indentation and line breaks, according to 
> the nesting of the DOM elements.
> 
> So far I've found the following links and information:
> 
> - https://docs.racket-lang.org/reference/pretty-print.html (I don't know how 
> to use it, because it has no examples. It also seems more like a library, 
> which generically can pretty print anything you want, provided you 
> "configure" is correctly. However, HTML is quite complex, I think, so I'd not 
> like to rewrite something that already exists elsewhere.)
> - https://docs.racket-lang.org/xml/ (Here are some mentions of indentation 
> and newlines, but I need some procedure, which returns it, not displays it 
> immediately and then "does not let me have it", or is there a way to somehow 
> redirect output into a value which I can use? For example `display-xml` seems 
> to do what I need. :)
> 
> Ideal might be a keyword parameter for `xexpr->string`, which specifies 
> whether it should prettify the string or not, but such a thing does not exist 
> according to the docs.
> 
> How can I prettify my HTML output?
> 
> (I really don't care about a few bytes more data needing to be sent. This is 
> not the next Google.)
> 
> -- 
> You received this message because you are subscribed to the Google Groups 
> "Racket Users" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
> email to racket-users+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.

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