ConTeXt, HTML source code side by side to the result from the web











up vote
5
down vote

favorite












I would like to write a document with some HTML code and next to it the result from a webpage.



Basically something like



starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample


Would print the code highlighted side by side to the result of how it looks in a website.



What I have in mind is that the environment




  • creates a new file for each example with .html extension where it stores some code that goes before the contents of the environment;

  • then the contents of the environment, in this case <strong>Hello</strong>, <em>world<em>;

  • some post html tags to close the file;


  • then process the file with a command 



    firefox -screenshot "screenshot-n.png" "file:///Users/blah/blah/file-n.html"


    (well, with options --window-size="certainwidth,certainheight") to get a .png



  • then add side by side the code (colored with usemodule[vim]) and the image of the results.



Here's a “mockup”



starttext



Something like



starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample



should do something like



%             here v pre code

startbuffer

  <html>

   <strong>Hello</strong>, <em>world<em>

  </html>

stopbuffer % here ^ post code



% save this buffer to a file, say, htmls/html-1.html

% take a screenshot and save to screenshots/screenshot-1.png



startxtable[option=stretch]

  startxrow

    startxcell

      typehtmlfile[htmls/html-1.html] % this seems buggy

    stopxcell

    startxcell

      externalfile[screenshots/screenshot-1.png]

    stopxcell

  stopxrow

stopxtable



stoptext


And to be clear, I'm relatively new to ConTeXt, so this might be solvable with other systems, and this is an X Y problem.



My idea is to write a document with many small examples of html code.






context html







share|improve this question




















  • 3




    Looks like a job for filter.
    – Henri Menke
    Nov 16 at 20:38










  • Thanks, yes, it looks like it :) Not able to make it work, but working on it. Nice to see this things exist.
    – Manuel
    Nov 16 at 21:44















up vote
5
down vote

favorite












I would like to write a document with some HTML code and next to it the result from a webpage.



Basically something like



starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample


Would print the code highlighted side by side to the result of how it looks in a website.



What I have in mind is that the environment




  • creates a new file for each example with .html extension where it stores some code that goes before the contents of the environment;

  • then the contents of the environment, in this case <strong>Hello</strong>, <em>world<em>;

  • some post html tags to close the file;


  • then process the file with a command 



    firefox -screenshot "screenshot-n.png" "file:///Users/blah/blah/file-n.html"


    (well, with options --window-size="certainwidth,certainheight") to get a .png



  • then add side by side the code (colored with usemodule[vim]) and the image of the results.



Here's a “mockup”



starttext



Something like



starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample



should do something like



%             here v pre code

startbuffer

  <html>

   <strong>Hello</strong>, <em>world<em>

  </html>

stopbuffer % here ^ post code



% save this buffer to a file, say, htmls/html-1.html

% take a screenshot and save to screenshots/screenshot-1.png



startxtable[option=stretch]

  startxrow

    startxcell

      typehtmlfile[htmls/html-1.html] % this seems buggy

    stopxcell

    startxcell

      externalfile[screenshots/screenshot-1.png]

    stopxcell

  stopxrow

stopxtable



stoptext


And to be clear, I'm relatively new to ConTeXt, so this might be solvable with other systems, and this is an X Y problem.



My idea is to write a document with many small examples of html code.






context html







share|improve this question




















  • 3




    Looks like a job for filter.
    – Henri Menke
    Nov 16 at 20:38










  • Thanks, yes, it looks like it :) Not able to make it work, but working on it. Nice to see this things exist.
    – Manuel
    Nov 16 at 21:44













up vote
5
down vote

favorite









up vote
5
down vote

favorite











I would like to write a document with some HTML code and next to it the result from a webpage.



Basically something like



starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample


Would print the code highlighted side by side to the result of how it looks in a website.



What I have in mind is that the environment




  • creates a new file for each example with .html extension where it stores some code that goes before the contents of the environment;

  • then the contents of the environment, in this case <strong>Hello</strong>, <em>world<em>;

  • some post html tags to close the file;


  • then process the file with a command 



    firefox -screenshot "screenshot-n.png" "file:///Users/blah/blah/file-n.html"


    (well, with options --window-size="certainwidth,certainheight") to get a .png



  • then add side by side the code (colored with usemodule[vim]) and the image of the results.



Here's a “mockup”



starttext



Something like



starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample



should do something like



%             here v pre code

startbuffer

  <html>

   <strong>Hello</strong>, <em>world<em>

  </html>

stopbuffer % here ^ post code



% save this buffer to a file, say, htmls/html-1.html

% take a screenshot and save to screenshots/screenshot-1.png



startxtable[option=stretch]

  startxrow

    startxcell

      typehtmlfile[htmls/html-1.html] % this seems buggy

    stopxcell

    startxcell

      externalfile[screenshots/screenshot-1.png]

    stopxcell

  stopxrow

stopxtable



stoptext


And to be clear, I'm relatively new to ConTeXt, so this might be solvable with other systems, and this is an X Y problem.



My idea is to write a document with many small examples of html code.






context html







share|improve this question















I would like to write a document with some HTML code and next to it the result from a webpage.



Basically something like



starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample


Would print the code highlighted side by side to the result of how it looks in a website.



What I have in mind is that the environment




  • creates a new file for each example with .html extension where it stores some code that goes before the contents of the environment;

  • then the contents of the environment, in this case <strong>Hello</strong>, <em>world<em>;

  • some post html tags to close the file;


  • then process the file with a command 



    firefox -screenshot "screenshot-n.png" "file:///Users/blah/blah/file-n.html"


    (well, with options --window-size="certainwidth,certainheight") to get a .png



  • then add side by side the code (colored with usemodule[vim]) and the image of the results.



Here's a “mockup”



starttext



Something like



starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample



should do something like



%             here v pre code

startbuffer

  <html>

   <strong>Hello</strong>, <em>world<em>

  </html>

stopbuffer % here ^ post code



% save this buffer to a file, say, htmls/html-1.html

% take a screenshot and save to screenshots/screenshot-1.png



startxtable[option=stretch]

  startxrow

    startxcell

      typehtmlfile[htmls/html-1.html] % this seems buggy

    stopxcell

    startxcell

      externalfile[screenshots/screenshot-1.png]

    stopxcell

  stopxrow

stopxtable



stoptext


And to be clear, I'm relatively new to ConTeXt, so this might be solvable with other systems, and this is an X Y problem.



My idea is to write a document with many small examples of html code.






context html




context html






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 17 at 14:02

























asked Nov 16 at 19:39









Manuel

21k845105




21k845105








  • 3




    Looks like a job for filter.
    – Henri Menke
    Nov 16 at 20:38










  • Thanks, yes, it looks like it :) Not able to make it work, but working on it. Nice to see this things exist.
    – Manuel
    Nov 16 at 21:44














  • 3




    Looks like a job for filter.
    – Henri Menke
    Nov 16 at 20:38










  • Thanks, yes, it looks like it :) Not able to make it work, but working on it. Nice to see this things exist.
    – Manuel
    Nov 16 at 21:44








3




3




Looks like a job for filter.
– Henri Menke
Nov 16 at 20:38




Looks like a job for filter.
– Henri Menke
Nov 16 at 20:38












Thanks, yes, it looks like it :) Not able to make it work, but working on it. Nice to see this things exist.
– Manuel
Nov 16 at 21:44




Thanks, yes, it looks like it :) Not able to make it work, but working on it. Nice to see this things exist.
– Manuel
Nov 16 at 21:44










2 Answers
2






active

oldest

votes

















up vote
2
down vote



accepted










I cannot install webkit2png, so here is an illustration of how to do this using pandoc to convert html to pdf. First, let's start with the basic feature of showing both the source. Note that you need a local directory call html for this to work.



usemodule[filter]



startbuffer[before-html-example]

  <html>

  <head>

    <meta charset="utf-8">

  </head>

  <body style="line-height: 1.5; font-size: 30">

stopbuffer



startbuffer[after-html-example]

  </body>

  </html>

stopbuffer



traceexternalfilters



defineexternalfilter

    [htmlexample]

    [

      directory=html,

      bufferbefore=before-html-example,

      bufferafter=after-html-example,

      output=externalfilterbasefile.pdf, 

      filtercommand={pandoc -f html externalfilterinputfilespace -o externalfilteroutputfile},

      purge=no,

      cache=yes,

      readcommand=DisplaySourceAndOutput,

    ]



defDisplaySourceAndOutput#1%

    {typefile{externalfilterinputfile}

     externalfigure[#1][frame=on,width=10cm]}





starttext

Hello

starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample

stoptext


enter image description here



Now, let's add syntax highlighting and remove the before and after code from the displayed code snippet. So, we change the definition of DisplaySourceAndOutput as follows:



usemodule[vim]



definevimtyping[html][syntax=html,directory=html]



defDisplaySourceAndOutput#1%

    {typehtmlfile[start=6,stop=-2]{externalfilterinputfile}

     externalfigure[#1][frame=on,width=10cm]}


The value start=6 asks typehtmlfile to show the output from the 6th line (because before-html-example has 5 lines). The value stop=-2 asks not to show the last 2 lines (because after-html-example has 2 lines).



The above example now gives:



enter image description here



Now all you need to do is modify DisplaySourceAndOutput as you want it to be displayed.



EDIT



I don't understand what you mean by the comment:




For example to allow for starthtmlexample ... realhtmlexample ... stophtmlexample or something like that.




Assuming that you want to ignore part of the environment, that is actually relatively easy (if you use buffers). For example, here is code to delete everything before the string !!START!! in the buffer:



startluacode

  filterdata = filterdata or {}



  local ctxcatcodes  = catcodes.numbers.ctxcatcodes





  filterdata.pre_process = function(name)

    local content = buffers.getcontent(name)

    content = string.gsub(content,'^.*!!START!!',"")

    buffers.assign(name,content, ctxcatcodes)

  end

stopluacode



starttext

Hello

startbuffer[demo]

  Stuff which is ignored

  !!START!!

  Stuff which is not ignored

stopbuffer



ctxlua{filterdata.pre_process("demo")}



typebuffer[demo]



stoptext





share|improve this answer























  • Okey, right now this works. Still it would be nice if there was a way to pre-process the buffer contents inside tex before exporting and processing with the filtercommand. For example to allow for starthtmlexample ... realhtmlexample ... stophtmlexample or something like that. Also, is there a way to output the contents of the code like in a table, with some cell for the text and then a second cell in the same row to put the image?
    – Manuel
    Nov 18 at 21:52










  • xtable does not work inside a macro. You can try the simpler placesidebyside{...}{...} or natural tables. If you really need the features of xtables, then using startsetups ... stopsetups should probably work.
    – Aditya
    Nov 19 at 4:34










  • And how could I hook that lua code before filter saves the buffer to a file? Also I would love if I could have the same behaviour as strip=yes after that !!START!!.
    – Manuel
    Nov 19 at 8:23










  • Simply use processhtmlexamplebuffer[demo].
    – Aditya
    Nov 19 at 13:49


















up vote
3
down vote













This is an answer as a work-in-progress of what I'm trying to achieve, with the suggestion of Henri Menke of using filter module, in company with webkit2png.



At the moment this “just works”. But it's far from the definitive. I'll leave it here until (hopefully) someone writes a better and more complete answer.



Things that I hope I can change:




  • save every extra file (from filter, vim, and webkit2png) in an folder/ so that the current directory is not polluted;


  • This one is solved through some hacks in the bash commands.



    have some “pre” and “post” code so one does not need to write everything (for example now I need to write <html><body> etc.), ideally the input would be for example



    starthtmlexample
    
  <strong>Hello</strong>, <em>world</em>
    
stophtmlexample


  • manage correctly the sizes of the image, and the fonts, and everything. Right now it's very fragile (I've done by hand the adjust of font-size: 30 in the webpage).



  • add some options to configure each example individually:




    • for example if we want examples side by side (for small examples), something like starthtmlexample[sidebyside] or starthtmlexample[sidebyside=30] or something like that to say what part is for the code and which part for the image, and also another option to show first the code then below the result;

    • options to change the pre-code, and post-code for an individual piece;


    • some way of altering what's shown and what's written, for example



      starthmlexample
      
  <p> Lorem ipsum ... </p>
      
realhtml
      
  <p>
      
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
      
    incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
      
    exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute
      
    irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
      
    pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
      
    deserunt mollit anim id est laborum.
      
  </p>
      
 stophtmlexample





  • an inline way of doing this that ends up working in kind of tables:



    startxtable
    
  startxrow
    
    inlinehtmlexample{<b>bold</b>}
    
  stopxrow
    
  sartxrow
    
    inlinehtmlexample{<i>cursive</i>}
    
  stopxrow
    
stopxtable


    to align many small results one below another.



  • right now I can't remember more things I thought (the frame=on is jut to know what's happening at the moment, that I don't actually know many things I'm using here); and of course


  • get a decent base design so that it looks better than the default I wrote.



Here's the code:



usemodule[vim]



definevimtyping

  [html]

  [syntax=html,

   directory=auxfiles,

   before={blanksetupbodyfont[small]},

   after={blank},

   lines=split]



startbuffer [before-html-example]

  <html>

  <head>

    <meta charset="utf-8">

  </head>

  <body style="line-height: 1.5; font-size: 30">

stopbuffer



savebuffer [before-html-example] [before-html-example]



% startbuffer [left-html-example]

% 

% stopbuffer

% 

% startbuffer [right-html-example]

% 

% stopbuffer



startbuffer [after-html-example]

  </body>

  </html>

stopbuffer



savebuffer [after-html-example] [after-html-example]



usemodule[filter]



defineexternalfilter

  [htmlexample]

  [%directory=auxfiles, % this doesn't work as (I) expected

%  input=externalfilterbasefile.html, % this doesn't exist, but may be should?

   output=externalfilterbasefile-full.png, % because of how webkit2png works

   filtercommand=htmlfiltercommand,

   readcommand=htmlexamplereadcommand,

   cache=yes,

   indentnext=no]



defhtmlexamplereadcommand#1%

  {bpartypehtmlfile{externalfilterinputfile}epar

   bparexternalfigure[#1][frame=on,maxwidth=.5textwidth]epar}



deffirefoxpath{/Applications/Firefox.app/Contents/MacOS}

defchromepath{/Applications/Google Chrome.app/Contents/MacOS}



defhtmlfiltercommand

  {htmlconcatenatepartshtmlobtainpng}

defhtmlconcatenateparts

  {cat "html-before-html-example.tmp" "externalfilterinputfile" "html-after-html-example.tmp" > "tmp.html";}

defhtmlobtainpng

  {webkit2png

   %--dir="auxfiles" % doesn't work correctly with externalfilter

   --fullsize

   --width=1 % to get the minimum

   --height=1 % to get the minimum

   --scale=1 % unused

   --filename="externalfilterbasefile"

   "tmp.html";}



% {firefoxpath/firefox

%  -screenshot

%  "externalfilteroutputfile"

%  "externalfilterinputfile"}



% {chromepath/Google Chrome

%  --headless

%  --screenshot="externalfilteroutputfile"

%  "externalfilterinputfile"}



starttext



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



starthtmlexample

  <strong>Hello</strong>, <em>world</em>

stophtmlexample



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



starthtmlexample

  <pre>

     1   2   3   4   5   6   7   <b>Forever,</b><br/>

     8   9  10  11  12  13  14      and ever.<br/>

    15  16  17  18  19  20  21

  </pre>

stophtmlexample



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure inlinehtml{<b>alo</b>} dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



stopchapter



stoptext





share|improve this answer























  • For directory=output to work, you need to create the directory on your own.
    – Aditya
    Nov 18 at 7:07










  • For adding before and after content, search for bufferbefore and bufferafter in the documentation of the filter module
    – Aditya
    Nov 18 at 7:13










  • I see, still it doesn't work entirely well (or as expected) with webkit2png so I decided not to use it. And bufferbefore and bufferafter is of no use, because I want to input certain things, and then print those things while processing a different one. For now I think I could rely on bash commands, but I wrote this question in case someone showed a nice solution that is entirely ConTeXt / Lua, rather than hacks here and there.
    – Manuel
    Nov 18 at 13:07










  • Does webkit2png --filename=html/test.tmp html/test.png work from the command line? If so, then it should also work from within the filter module. Regarding bufferbeforr etc, I don't understand what you mean by print those things while processing a different one. Can you give an example?
    – Aditya
    Nov 18 at 14:28










  • I updated the answer. Well, the idea is to write in the example only a part of the whole file that is processed. So if I write starthtmlexample <b>bold</bold> stophtmlexample I want the file to be processed to have <html><body><b>bold</b></body></html> for example.
    – Manuel
    Nov 18 at 14:56











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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
2
down vote



accepted










I cannot install webkit2png, so here is an illustration of how to do this using pandoc to convert html to pdf. First, let's start with the basic feature of showing both the source. Note that you need a local directory call html for this to work.



usemodule[filter]



startbuffer[before-html-example]

  <html>

  <head>

    <meta charset="utf-8">

  </head>

  <body style="line-height: 1.5; font-size: 30">

stopbuffer



startbuffer[after-html-example]

  </body>

  </html>

stopbuffer



traceexternalfilters



defineexternalfilter

    [htmlexample]

    [

      directory=html,

      bufferbefore=before-html-example,

      bufferafter=after-html-example,

      output=externalfilterbasefile.pdf, 

      filtercommand={pandoc -f html externalfilterinputfilespace -o externalfilteroutputfile},

      purge=no,

      cache=yes,

      readcommand=DisplaySourceAndOutput,

    ]



defDisplaySourceAndOutput#1%

    {typefile{externalfilterinputfile}

     externalfigure[#1][frame=on,width=10cm]}





starttext

Hello

starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample

stoptext


enter image description here



Now, let's add syntax highlighting and remove the before and after code from the displayed code snippet. So, we change the definition of DisplaySourceAndOutput as follows:



usemodule[vim]



definevimtyping[html][syntax=html,directory=html]



defDisplaySourceAndOutput#1%

    {typehtmlfile[start=6,stop=-2]{externalfilterinputfile}

     externalfigure[#1][frame=on,width=10cm]}


The value start=6 asks typehtmlfile to show the output from the 6th line (because before-html-example has 5 lines). The value stop=-2 asks not to show the last 2 lines (because after-html-example has 2 lines).



The above example now gives:



enter image description here



Now all you need to do is modify DisplaySourceAndOutput as you want it to be displayed.



EDIT



I don't understand what you mean by the comment:




For example to allow for starthtmlexample ... realhtmlexample ... stophtmlexample or something like that.




Assuming that you want to ignore part of the environment, that is actually relatively easy (if you use buffers). For example, here is code to delete everything before the string !!START!! in the buffer:



startluacode

  filterdata = filterdata or {}



  local ctxcatcodes  = catcodes.numbers.ctxcatcodes





  filterdata.pre_process = function(name)

    local content = buffers.getcontent(name)

    content = string.gsub(content,'^.*!!START!!',"")

    buffers.assign(name,content, ctxcatcodes)

  end

stopluacode



starttext

Hello

startbuffer[demo]

  Stuff which is ignored

  !!START!!

  Stuff which is not ignored

stopbuffer



ctxlua{filterdata.pre_process("demo")}



typebuffer[demo]



stoptext





share|improve this answer























  • Okey, right now this works. Still it would be nice if there was a way to pre-process the buffer contents inside tex before exporting and processing with the filtercommand. For example to allow for starthtmlexample ... realhtmlexample ... stophtmlexample or something like that. Also, is there a way to output the contents of the code like in a table, with some cell for the text and then a second cell in the same row to put the image?
    – Manuel
    Nov 18 at 21:52










  • xtable does not work inside a macro. You can try the simpler placesidebyside{...}{...} or natural tables. If you really need the features of xtables, then using startsetups ... stopsetups should probably work.
    – Aditya
    Nov 19 at 4:34










  • And how could I hook that lua code before filter saves the buffer to a file? Also I would love if I could have the same behaviour as strip=yes after that !!START!!.
    – Manuel
    Nov 19 at 8:23










  • Simply use processhtmlexamplebuffer[demo].
    – Aditya
    Nov 19 at 13:49















up vote
2
down vote



accepted










I cannot install webkit2png, so here is an illustration of how to do this using pandoc to convert html to pdf. First, let's start with the basic feature of showing both the source. Note that you need a local directory call html for this to work.



usemodule[filter]



startbuffer[before-html-example]

  <html>

  <head>

    <meta charset="utf-8">

  </head>

  <body style="line-height: 1.5; font-size: 30">

stopbuffer



startbuffer[after-html-example]

  </body>

  </html>

stopbuffer



traceexternalfilters



defineexternalfilter

    [htmlexample]

    [

      directory=html,

      bufferbefore=before-html-example,

      bufferafter=after-html-example,

      output=externalfilterbasefile.pdf, 

      filtercommand={pandoc -f html externalfilterinputfilespace -o externalfilteroutputfile},

      purge=no,

      cache=yes,

      readcommand=DisplaySourceAndOutput,

    ]



defDisplaySourceAndOutput#1%

    {typefile{externalfilterinputfile}

     externalfigure[#1][frame=on,width=10cm]}





starttext

Hello

starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample

stoptext


enter image description here



Now, let's add syntax highlighting and remove the before and after code from the displayed code snippet. So, we change the definition of DisplaySourceAndOutput as follows:



usemodule[vim]



definevimtyping[html][syntax=html,directory=html]



defDisplaySourceAndOutput#1%

    {typehtmlfile[start=6,stop=-2]{externalfilterinputfile}

     externalfigure[#1][frame=on,width=10cm]}


The value start=6 asks typehtmlfile to show the output from the 6th line (because before-html-example has 5 lines). The value stop=-2 asks not to show the last 2 lines (because after-html-example has 2 lines).



The above example now gives:



enter image description here



Now all you need to do is modify DisplaySourceAndOutput as you want it to be displayed.



EDIT



I don't understand what you mean by the comment:




For example to allow for starthtmlexample ... realhtmlexample ... stophtmlexample or something like that.




Assuming that you want to ignore part of the environment, that is actually relatively easy (if you use buffers). For example, here is code to delete everything before the string !!START!! in the buffer:



startluacode

  filterdata = filterdata or {}



  local ctxcatcodes  = catcodes.numbers.ctxcatcodes





  filterdata.pre_process = function(name)

    local content = buffers.getcontent(name)

    content = string.gsub(content,'^.*!!START!!',"")

    buffers.assign(name,content, ctxcatcodes)

  end

stopluacode



starttext

Hello

startbuffer[demo]

  Stuff which is ignored

  !!START!!

  Stuff which is not ignored

stopbuffer



ctxlua{filterdata.pre_process("demo")}



typebuffer[demo]



stoptext





share|improve this answer























  • Okey, right now this works. Still it would be nice if there was a way to pre-process the buffer contents inside tex before exporting and processing with the filtercommand. For example to allow for starthtmlexample ... realhtmlexample ... stophtmlexample or something like that. Also, is there a way to output the contents of the code like in a table, with some cell for the text and then a second cell in the same row to put the image?
    – Manuel
    Nov 18 at 21:52










  • xtable does not work inside a macro. You can try the simpler placesidebyside{...}{...} or natural tables. If you really need the features of xtables, then using startsetups ... stopsetups should probably work.
    – Aditya
    Nov 19 at 4:34










  • And how could I hook that lua code before filter saves the buffer to a file? Also I would love if I could have the same behaviour as strip=yes after that !!START!!.
    – Manuel
    Nov 19 at 8:23










  • Simply use processhtmlexamplebuffer[demo].
    – Aditya
    Nov 19 at 13:49













up vote
2
down vote



accepted







up vote
2
down vote



accepted






I cannot install webkit2png, so here is an illustration of how to do this using pandoc to convert html to pdf. First, let's start with the basic feature of showing both the source. Note that you need a local directory call html for this to work.



usemodule[filter]



startbuffer[before-html-example]

  <html>

  <head>

    <meta charset="utf-8">

  </head>

  <body style="line-height: 1.5; font-size: 30">

stopbuffer



startbuffer[after-html-example]

  </body>

  </html>

stopbuffer



traceexternalfilters



defineexternalfilter

    [htmlexample]

    [

      directory=html,

      bufferbefore=before-html-example,

      bufferafter=after-html-example,

      output=externalfilterbasefile.pdf, 

      filtercommand={pandoc -f html externalfilterinputfilespace -o externalfilteroutputfile},

      purge=no,

      cache=yes,

      readcommand=DisplaySourceAndOutput,

    ]



defDisplaySourceAndOutput#1%

    {typefile{externalfilterinputfile}

     externalfigure[#1][frame=on,width=10cm]}





starttext

Hello

starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample

stoptext


enter image description here



Now, let's add syntax highlighting and remove the before and after code from the displayed code snippet. So, we change the definition of DisplaySourceAndOutput as follows:



usemodule[vim]



definevimtyping[html][syntax=html,directory=html]



defDisplaySourceAndOutput#1%

    {typehtmlfile[start=6,stop=-2]{externalfilterinputfile}

     externalfigure[#1][frame=on,width=10cm]}


The value start=6 asks typehtmlfile to show the output from the 6th line (because before-html-example has 5 lines). The value stop=-2 asks not to show the last 2 lines (because after-html-example has 2 lines).



The above example now gives:



enter image description here



Now all you need to do is modify DisplaySourceAndOutput as you want it to be displayed.



EDIT



I don't understand what you mean by the comment:




For example to allow for starthtmlexample ... realhtmlexample ... stophtmlexample or something like that.




Assuming that you want to ignore part of the environment, that is actually relatively easy (if you use buffers). For example, here is code to delete everything before the string !!START!! in the buffer:



startluacode

  filterdata = filterdata or {}



  local ctxcatcodes  = catcodes.numbers.ctxcatcodes





  filterdata.pre_process = function(name)

    local content = buffers.getcontent(name)

    content = string.gsub(content,'^.*!!START!!',"")

    buffers.assign(name,content, ctxcatcodes)

  end

stopluacode



starttext

Hello

startbuffer[demo]

  Stuff which is ignored

  !!START!!

  Stuff which is not ignored

stopbuffer



ctxlua{filterdata.pre_process("demo")}



typebuffer[demo]



stoptext





share|improve this answer














I cannot install webkit2png, so here is an illustration of how to do this using pandoc to convert html to pdf. First, let's start with the basic feature of showing both the source. Note that you need a local directory call html for this to work.



usemodule[filter]



startbuffer[before-html-example]

  <html>

  <head>

    <meta charset="utf-8">

  </head>

  <body style="line-height: 1.5; font-size: 30">

stopbuffer



startbuffer[after-html-example]

  </body>

  </html>

stopbuffer



traceexternalfilters



defineexternalfilter

    [htmlexample]

    [

      directory=html,

      bufferbefore=before-html-example,

      bufferafter=after-html-example,

      output=externalfilterbasefile.pdf, 

      filtercommand={pandoc -f html externalfilterinputfilespace -o externalfilteroutputfile},

      purge=no,

      cache=yes,

      readcommand=DisplaySourceAndOutput,

    ]



defDisplaySourceAndOutput#1%

    {typefile{externalfilterinputfile}

     externalfigure[#1][frame=on,width=10cm]}





starttext

Hello

starthtmlexample

  <strong>Hello</strong>, <em>world<em>

stophtmlexample

stoptext


enter image description here



Now, let's add syntax highlighting and remove the before and after code from the displayed code snippet. So, we change the definition of DisplaySourceAndOutput as follows:



usemodule[vim]



definevimtyping[html][syntax=html,directory=html]



defDisplaySourceAndOutput#1%

    {typehtmlfile[start=6,stop=-2]{externalfilterinputfile}

     externalfigure[#1][frame=on,width=10cm]}


The value start=6 asks typehtmlfile to show the output from the 6th line (because before-html-example has 5 lines). The value stop=-2 asks not to show the last 2 lines (because after-html-example has 2 lines).



The above example now gives:



enter image description here



Now all you need to do is modify DisplaySourceAndOutput as you want it to be displayed.



EDIT



I don't understand what you mean by the comment:




For example to allow for starthtmlexample ... realhtmlexample ... stophtmlexample or something like that.




Assuming that you want to ignore part of the environment, that is actually relatively easy (if you use buffers). For example, here is code to delete everything before the string !!START!! in the buffer:



startluacode

  filterdata = filterdata or {}



  local ctxcatcodes  = catcodes.numbers.ctxcatcodes





  filterdata.pre_process = function(name)

    local content = buffers.getcontent(name)

    content = string.gsub(content,'^.*!!START!!',"")

    buffers.assign(name,content, ctxcatcodes)

  end

stopluacode



starttext

Hello

startbuffer[demo]

  Stuff which is ignored

  !!START!!

  Stuff which is not ignored

stopbuffer



ctxlua{filterdata.pre_process("demo")}



typebuffer[demo]



stoptext






share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 19 at 4:30

























answered Nov 18 at 16:57









Aditya

54.7k2109233




54.7k2109233












  • Okey, right now this works. Still it would be nice if there was a way to pre-process the buffer contents inside tex before exporting and processing with the filtercommand. For example to allow for starthtmlexample ... realhtmlexample ... stophtmlexample or something like that. Also, is there a way to output the contents of the code like in a table, with some cell for the text and then a second cell in the same row to put the image?
    – Manuel
    Nov 18 at 21:52










  • xtable does not work inside a macro. You can try the simpler placesidebyside{...}{...} or natural tables. If you really need the features of xtables, then using startsetups ... stopsetups should probably work.
    – Aditya
    Nov 19 at 4:34










  • And how could I hook that lua code before filter saves the buffer to a file? Also I would love if I could have the same behaviour as strip=yes after that !!START!!.
    – Manuel
    Nov 19 at 8:23










  • Simply use processhtmlexamplebuffer[demo].
    – Aditya
    Nov 19 at 13:49


















  • Okey, right now this works. Still it would be nice if there was a way to pre-process the buffer contents inside tex before exporting and processing with the filtercommand. For example to allow for starthtmlexample ... realhtmlexample ... stophtmlexample or something like that. Also, is there a way to output the contents of the code like in a table, with some cell for the text and then a second cell in the same row to put the image?
    – Manuel
    Nov 18 at 21:52










  • xtable does not work inside a macro. You can try the simpler placesidebyside{...}{...} or natural tables. If you really need the features of xtables, then using startsetups ... stopsetups should probably work.
    – Aditya
    Nov 19 at 4:34










  • And how could I hook that lua code before filter saves the buffer to a file? Also I would love if I could have the same behaviour as strip=yes after that !!START!!.
    – Manuel
    Nov 19 at 8:23










  • Simply use processhtmlexamplebuffer[demo].
    – Aditya
    Nov 19 at 13:49
















Okey, right now this works. Still it would be nice if there was a way to pre-process the buffer contents inside tex before exporting and processing with the filtercommand. For example to allow for starthtmlexample ... realhtmlexample ... stophtmlexample or something like that. Also, is there a way to output the contents of the code like in a table, with some cell for the text and then a second cell in the same row to put the image?
– Manuel
Nov 18 at 21:52




Okey, right now this works. Still it would be nice if there was a way to pre-process the buffer contents inside tex before exporting and processing with the filtercommand. For example to allow for starthtmlexample ... realhtmlexample ... stophtmlexample or something like that. Also, is there a way to output the contents of the code like in a table, with some cell for the text and then a second cell in the same row to put the image?
– Manuel
Nov 18 at 21:52












xtable does not work inside a macro. You can try the simpler placesidebyside{...}{...} or natural tables. If you really need the features of xtables, then using startsetups ... stopsetups should probably work.
– Aditya
Nov 19 at 4:34




xtable does not work inside a macro. You can try the simpler placesidebyside{...}{...} or natural tables. If you really need the features of xtables, then using startsetups ... stopsetups should probably work.
– Aditya
Nov 19 at 4:34












And how could I hook that lua code before filter saves the buffer to a file? Also I would love if I could have the same behaviour as strip=yes after that !!START!!.
– Manuel
Nov 19 at 8:23




And how could I hook that lua code before filter saves the buffer to a file? Also I would love if I could have the same behaviour as strip=yes after that !!START!!.
– Manuel
Nov 19 at 8:23












Simply use processhtmlexamplebuffer[demo].
– Aditya
Nov 19 at 13:49




Simply use processhtmlexamplebuffer[demo].
– Aditya
Nov 19 at 13:49










up vote
3
down vote













This is an answer as a work-in-progress of what I'm trying to achieve, with the suggestion of Henri Menke of using filter module, in company with webkit2png.



At the moment this “just works”. But it's far from the definitive. I'll leave it here until (hopefully) someone writes a better and more complete answer.



Things that I hope I can change:




  • save every extra file (from filter, vim, and webkit2png) in an folder/ so that the current directory is not polluted;


  • This one is solved through some hacks in the bash commands.



    have some “pre” and “post” code so one does not need to write everything (for example now I need to write <html><body> etc.), ideally the input would be for example



    starthtmlexample
    
  <strong>Hello</strong>, <em>world</em>
    
stophtmlexample


  • manage correctly the sizes of the image, and the fonts, and everything. Right now it's very fragile (I've done by hand the adjust of font-size: 30 in the webpage).



  • add some options to configure each example individually:




    • for example if we want examples side by side (for small examples), something like starthtmlexample[sidebyside] or starthtmlexample[sidebyside=30] or something like that to say what part is for the code and which part for the image, and also another option to show first the code then below the result;

    • options to change the pre-code, and post-code for an individual piece;


    • some way of altering what's shown and what's written, for example



      starthmlexample
      
  <p> Lorem ipsum ... </p>
      
realhtml
      
  <p>
      
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
      
    incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
      
    exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute
      
    irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
      
    pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
      
    deserunt mollit anim id est laborum.
      
  </p>
      
 stophtmlexample





  • an inline way of doing this that ends up working in kind of tables:



    startxtable
    
  startxrow
    
    inlinehtmlexample{<b>bold</b>}
    
  stopxrow
    
  sartxrow
    
    inlinehtmlexample{<i>cursive</i>}
    
  stopxrow
    
stopxtable


    to align many small results one below another.



  • right now I can't remember more things I thought (the frame=on is jut to know what's happening at the moment, that I don't actually know many things I'm using here); and of course


  • get a decent base design so that it looks better than the default I wrote.



Here's the code:



usemodule[vim]



definevimtyping

  [html]

  [syntax=html,

   directory=auxfiles,

   before={blanksetupbodyfont[small]},

   after={blank},

   lines=split]



startbuffer [before-html-example]

  <html>

  <head>

    <meta charset="utf-8">

  </head>

  <body style="line-height: 1.5; font-size: 30">

stopbuffer



savebuffer [before-html-example] [before-html-example]



% startbuffer [left-html-example]

% 

% stopbuffer

% 

% startbuffer [right-html-example]

% 

% stopbuffer



startbuffer [after-html-example]

  </body>

  </html>

stopbuffer



savebuffer [after-html-example] [after-html-example]



usemodule[filter]



defineexternalfilter

  [htmlexample]

  [%directory=auxfiles, % this doesn't work as (I) expected

%  input=externalfilterbasefile.html, % this doesn't exist, but may be should?

   output=externalfilterbasefile-full.png, % because of how webkit2png works

   filtercommand=htmlfiltercommand,

   readcommand=htmlexamplereadcommand,

   cache=yes,

   indentnext=no]



defhtmlexamplereadcommand#1%

  {bpartypehtmlfile{externalfilterinputfile}epar

   bparexternalfigure[#1][frame=on,maxwidth=.5textwidth]epar}



deffirefoxpath{/Applications/Firefox.app/Contents/MacOS}

defchromepath{/Applications/Google Chrome.app/Contents/MacOS}



defhtmlfiltercommand

  {htmlconcatenatepartshtmlobtainpng}

defhtmlconcatenateparts

  {cat "html-before-html-example.tmp" "externalfilterinputfile" "html-after-html-example.tmp" > "tmp.html";}

defhtmlobtainpng

  {webkit2png

   %--dir="auxfiles" % doesn't work correctly with externalfilter

   --fullsize

   --width=1 % to get the minimum

   --height=1 % to get the minimum

   --scale=1 % unused

   --filename="externalfilterbasefile"

   "tmp.html";}



% {firefoxpath/firefox

%  -screenshot

%  "externalfilteroutputfile"

%  "externalfilterinputfile"}



% {chromepath/Google Chrome

%  --headless

%  --screenshot="externalfilteroutputfile"

%  "externalfilterinputfile"}



starttext



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



starthtmlexample

  <strong>Hello</strong>, <em>world</em>

stophtmlexample



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



starthtmlexample

  <pre>

     1   2   3   4   5   6   7   <b>Forever,</b><br/>

     8   9  10  11  12  13  14      and ever.<br/>

    15  16  17  18  19  20  21

  </pre>

stophtmlexample



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure inlinehtml{<b>alo</b>} dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



stopchapter



stoptext





share|improve this answer























  • For directory=output to work, you need to create the directory on your own.
    – Aditya
    Nov 18 at 7:07










  • For adding before and after content, search for bufferbefore and bufferafter in the documentation of the filter module
    – Aditya
    Nov 18 at 7:13










  • I see, still it doesn't work entirely well (or as expected) with webkit2png so I decided not to use it. And bufferbefore and bufferafter is of no use, because I want to input certain things, and then print those things while processing a different one. For now I think I could rely on bash commands, but I wrote this question in case someone showed a nice solution that is entirely ConTeXt / Lua, rather than hacks here and there.
    – Manuel
    Nov 18 at 13:07










  • Does webkit2png --filename=html/test.tmp html/test.png work from the command line? If so, then it should also work from within the filter module. Regarding bufferbeforr etc, I don't understand what you mean by print those things while processing a different one. Can you give an example?
    – Aditya
    Nov 18 at 14:28










  • I updated the answer. Well, the idea is to write in the example only a part of the whole file that is processed. So if I write starthtmlexample <b>bold</bold> stophtmlexample I want the file to be processed to have <html><body><b>bold</b></body></html> for example.
    – Manuel
    Nov 18 at 14:56















up vote
3
down vote













This is an answer as a work-in-progress of what I'm trying to achieve, with the suggestion of Henri Menke of using filter module, in company with webkit2png.



At the moment this “just works”. But it's far from the definitive. I'll leave it here until (hopefully) someone writes a better and more complete answer.



Things that I hope I can change:




  • save every extra file (from filter, vim, and webkit2png) in an folder/ so that the current directory is not polluted;


  • This one is solved through some hacks in the bash commands.



    have some “pre” and “post” code so one does not need to write everything (for example now I need to write <html><body> etc.), ideally the input would be for example



    starthtmlexample
    
  <strong>Hello</strong>, <em>world</em>
    
stophtmlexample


  • manage correctly the sizes of the image, and the fonts, and everything. Right now it's very fragile (I've done by hand the adjust of font-size: 30 in the webpage).



  • add some options to configure each example individually:




    • for example if we want examples side by side (for small examples), something like starthtmlexample[sidebyside] or starthtmlexample[sidebyside=30] or something like that to say what part is for the code and which part for the image, and also another option to show first the code then below the result;

    • options to change the pre-code, and post-code for an individual piece;


    • some way of altering what's shown and what's written, for example



      starthmlexample
      
  <p> Lorem ipsum ... </p>
      
realhtml
      
  <p>
      
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
      
    incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
      
    exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute
      
    irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
      
    pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
      
    deserunt mollit anim id est laborum.
      
  </p>
      
 stophtmlexample





  • an inline way of doing this that ends up working in kind of tables:



    startxtable
    
  startxrow
    
    inlinehtmlexample{<b>bold</b>}
    
  stopxrow
    
  sartxrow
    
    inlinehtmlexample{<i>cursive</i>}
    
  stopxrow
    
stopxtable


    to align many small results one below another.



  • right now I can't remember more things I thought (the frame=on is jut to know what's happening at the moment, that I don't actually know many things I'm using here); and of course


  • get a decent base design so that it looks better than the default I wrote.



Here's the code:



usemodule[vim]



definevimtyping

  [html]

  [syntax=html,

   directory=auxfiles,

   before={blanksetupbodyfont[small]},

   after={blank},

   lines=split]



startbuffer [before-html-example]

  <html>

  <head>

    <meta charset="utf-8">

  </head>

  <body style="line-height: 1.5; font-size: 30">

stopbuffer



savebuffer [before-html-example] [before-html-example]



% startbuffer [left-html-example]

% 

% stopbuffer

% 

% startbuffer [right-html-example]

% 

% stopbuffer



startbuffer [after-html-example]

  </body>

  </html>

stopbuffer



savebuffer [after-html-example] [after-html-example]



usemodule[filter]



defineexternalfilter

  [htmlexample]

  [%directory=auxfiles, % this doesn't work as (I) expected

%  input=externalfilterbasefile.html, % this doesn't exist, but may be should?

   output=externalfilterbasefile-full.png, % because of how webkit2png works

   filtercommand=htmlfiltercommand,

   readcommand=htmlexamplereadcommand,

   cache=yes,

   indentnext=no]



defhtmlexamplereadcommand#1%

  {bpartypehtmlfile{externalfilterinputfile}epar

   bparexternalfigure[#1][frame=on,maxwidth=.5textwidth]epar}



deffirefoxpath{/Applications/Firefox.app/Contents/MacOS}

defchromepath{/Applications/Google Chrome.app/Contents/MacOS}



defhtmlfiltercommand

  {htmlconcatenatepartshtmlobtainpng}

defhtmlconcatenateparts

  {cat "html-before-html-example.tmp" "externalfilterinputfile" "html-after-html-example.tmp" > "tmp.html";}

defhtmlobtainpng

  {webkit2png

   %--dir="auxfiles" % doesn't work correctly with externalfilter

   --fullsize

   --width=1 % to get the minimum

   --height=1 % to get the minimum

   --scale=1 % unused

   --filename="externalfilterbasefile"

   "tmp.html";}



% {firefoxpath/firefox

%  -screenshot

%  "externalfilteroutputfile"

%  "externalfilterinputfile"}



% {chromepath/Google Chrome

%  --headless

%  --screenshot="externalfilteroutputfile"

%  "externalfilterinputfile"}



starttext



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



starthtmlexample

  <strong>Hello</strong>, <em>world</em>

stophtmlexample



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



starthtmlexample

  <pre>

     1   2   3   4   5   6   7   <b>Forever,</b><br/>

     8   9  10  11  12  13  14      and ever.<br/>

    15  16  17  18  19  20  21

  </pre>

stophtmlexample



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure inlinehtml{<b>alo</b>} dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



stopchapter



stoptext





share|improve this answer























  • For directory=output to work, you need to create the directory on your own.
    – Aditya
    Nov 18 at 7:07










  • For adding before and after content, search for bufferbefore and bufferafter in the documentation of the filter module
    – Aditya
    Nov 18 at 7:13










  • I see, still it doesn't work entirely well (or as expected) with webkit2png so I decided not to use it. And bufferbefore and bufferafter is of no use, because I want to input certain things, and then print those things while processing a different one. For now I think I could rely on bash commands, but I wrote this question in case someone showed a nice solution that is entirely ConTeXt / Lua, rather than hacks here and there.
    – Manuel
    Nov 18 at 13:07










  • Does webkit2png --filename=html/test.tmp html/test.png work from the command line? If so, then it should also work from within the filter module. Regarding bufferbeforr etc, I don't understand what you mean by print those things while processing a different one. Can you give an example?
    – Aditya
    Nov 18 at 14:28










  • I updated the answer. Well, the idea is to write in the example only a part of the whole file that is processed. So if I write starthtmlexample <b>bold</bold> stophtmlexample I want the file to be processed to have <html><body><b>bold</b></body></html> for example.
    – Manuel
    Nov 18 at 14:56













up vote
3
down vote










up vote
3
down vote









This is an answer as a work-in-progress of what I'm trying to achieve, with the suggestion of Henri Menke of using filter module, in company with webkit2png.



At the moment this “just works”. But it's far from the definitive. I'll leave it here until (hopefully) someone writes a better and more complete answer.



Things that I hope I can change:




  • save every extra file (from filter, vim, and webkit2png) in an folder/ so that the current directory is not polluted;


  • This one is solved through some hacks in the bash commands.



    have some “pre” and “post” code so one does not need to write everything (for example now I need to write <html><body> etc.), ideally the input would be for example



    starthtmlexample
    
  <strong>Hello</strong>, <em>world</em>
    
stophtmlexample


  • manage correctly the sizes of the image, and the fonts, and everything. Right now it's very fragile (I've done by hand the adjust of font-size: 30 in the webpage).



  • add some options to configure each example individually:




    • for example if we want examples side by side (for small examples), something like starthtmlexample[sidebyside] or starthtmlexample[sidebyside=30] or something like that to say what part is for the code and which part for the image, and also another option to show first the code then below the result;

    • options to change the pre-code, and post-code for an individual piece;


    • some way of altering what's shown and what's written, for example



      starthmlexample
      
  <p> Lorem ipsum ... </p>
      
realhtml
      
  <p>
      
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
      
    incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
      
    exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute
      
    irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
      
    pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
      
    deserunt mollit anim id est laborum.
      
  </p>
      
 stophtmlexample





  • an inline way of doing this that ends up working in kind of tables:



    startxtable
    
  startxrow
    
    inlinehtmlexample{<b>bold</b>}
    
  stopxrow
    
  sartxrow
    
    inlinehtmlexample{<i>cursive</i>}
    
  stopxrow
    
stopxtable


    to align many small results one below another.



  • right now I can't remember more things I thought (the frame=on is jut to know what's happening at the moment, that I don't actually know many things I'm using here); and of course


  • get a decent base design so that it looks better than the default I wrote.



Here's the code:



usemodule[vim]



definevimtyping

  [html]

  [syntax=html,

   directory=auxfiles,

   before={blanksetupbodyfont[small]},

   after={blank},

   lines=split]



startbuffer [before-html-example]

  <html>

  <head>

    <meta charset="utf-8">

  </head>

  <body style="line-height: 1.5; font-size: 30">

stopbuffer



savebuffer [before-html-example] [before-html-example]



% startbuffer [left-html-example]

% 

% stopbuffer

% 

% startbuffer [right-html-example]

% 

% stopbuffer



startbuffer [after-html-example]

  </body>

  </html>

stopbuffer



savebuffer [after-html-example] [after-html-example]



usemodule[filter]



defineexternalfilter

  [htmlexample]

  [%directory=auxfiles, % this doesn't work as (I) expected

%  input=externalfilterbasefile.html, % this doesn't exist, but may be should?

   output=externalfilterbasefile-full.png, % because of how webkit2png works

   filtercommand=htmlfiltercommand,

   readcommand=htmlexamplereadcommand,

   cache=yes,

   indentnext=no]



defhtmlexamplereadcommand#1%

  {bpartypehtmlfile{externalfilterinputfile}epar

   bparexternalfigure[#1][frame=on,maxwidth=.5textwidth]epar}



deffirefoxpath{/Applications/Firefox.app/Contents/MacOS}

defchromepath{/Applications/Google Chrome.app/Contents/MacOS}



defhtmlfiltercommand

  {htmlconcatenatepartshtmlobtainpng}

defhtmlconcatenateparts

  {cat "html-before-html-example.tmp" "externalfilterinputfile" "html-after-html-example.tmp" > "tmp.html";}

defhtmlobtainpng

  {webkit2png

   %--dir="auxfiles" % doesn't work correctly with externalfilter

   --fullsize

   --width=1 % to get the minimum

   --height=1 % to get the minimum

   --scale=1 % unused

   --filename="externalfilterbasefile"

   "tmp.html";}



% {firefoxpath/firefox

%  -screenshot

%  "externalfilteroutputfile"

%  "externalfilterinputfile"}



% {chromepath/Google Chrome

%  --headless

%  --screenshot="externalfilteroutputfile"

%  "externalfilterinputfile"}



starttext



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



starthtmlexample

  <strong>Hello</strong>, <em>world</em>

stophtmlexample



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



starthtmlexample

  <pre>

     1   2   3   4   5   6   7   <b>Forever,</b><br/>

     8   9  10  11  12  13  14      and ever.<br/>

    15  16  17  18  19  20  21

  </pre>

stophtmlexample



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure inlinehtml{<b>alo</b>} dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



stopchapter



stoptext





share|improve this answer














This is an answer as a work-in-progress of what I'm trying to achieve, with the suggestion of Henri Menke of using filter module, in company with webkit2png.



At the moment this “just works”. But it's far from the definitive. I'll leave it here until (hopefully) someone writes a better and more complete answer.



Things that I hope I can change:




  • save every extra file (from filter, vim, and webkit2png) in an folder/ so that the current directory is not polluted;


  • This one is solved through some hacks in the bash commands.



    have some “pre” and “post” code so one does not need to write everything (for example now I need to write <html><body> etc.), ideally the input would be for example



    starthtmlexample
    
  <strong>Hello</strong>, <em>world</em>
    
stophtmlexample


  • manage correctly the sizes of the image, and the fonts, and everything. Right now it's very fragile (I've done by hand the adjust of font-size: 30 in the webpage).



  • add some options to configure each example individually:




    • for example if we want examples side by side (for small examples), something like starthtmlexample[sidebyside] or starthtmlexample[sidebyside=30] or something like that to say what part is for the code and which part for the image, and also another option to show first the code then below the result;

    • options to change the pre-code, and post-code for an individual piece;


    • some way of altering what's shown and what's written, for example



      starthmlexample
      
  <p> Lorem ipsum ... </p>
      
realhtml
      
  <p>
      
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
      
    incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
      
    exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute
      
    irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
      
    pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
      
    deserunt mollit anim id est laborum.
      
  </p>
      
 stophtmlexample





  • an inline way of doing this that ends up working in kind of tables:



    startxtable
    
  startxrow
    
    inlinehtmlexample{<b>bold</b>}
    
  stopxrow
    
  sartxrow
    
    inlinehtmlexample{<i>cursive</i>}
    
  stopxrow
    
stopxtable


    to align many small results one below another.



  • right now I can't remember more things I thought (the frame=on is jut to know what's happening at the moment, that I don't actually know many things I'm using here); and of course


  • get a decent base design so that it looks better than the default I wrote.



Here's the code:



usemodule[vim]



definevimtyping

  [html]

  [syntax=html,

   directory=auxfiles,

   before={blanksetupbodyfont[small]},

   after={blank},

   lines=split]



startbuffer [before-html-example]

  <html>

  <head>

    <meta charset="utf-8">

  </head>

  <body style="line-height: 1.5; font-size: 30">

stopbuffer



savebuffer [before-html-example] [before-html-example]



% startbuffer [left-html-example]

% 

% stopbuffer

% 

% startbuffer [right-html-example]

% 

% stopbuffer



startbuffer [after-html-example]

  </body>

  </html>

stopbuffer



savebuffer [after-html-example] [after-html-example]



usemodule[filter]



defineexternalfilter

  [htmlexample]

  [%directory=auxfiles, % this doesn't work as (I) expected

%  input=externalfilterbasefile.html, % this doesn't exist, but may be should?

   output=externalfilterbasefile-full.png, % because of how webkit2png works

   filtercommand=htmlfiltercommand,

   readcommand=htmlexamplereadcommand,

   cache=yes,

   indentnext=no]



defhtmlexamplereadcommand#1%

  {bpartypehtmlfile{externalfilterinputfile}epar

   bparexternalfigure[#1][frame=on,maxwidth=.5textwidth]epar}



deffirefoxpath{/Applications/Firefox.app/Contents/MacOS}

defchromepath{/Applications/Google Chrome.app/Contents/MacOS}



defhtmlfiltercommand

  {htmlconcatenatepartshtmlobtainpng}

defhtmlconcatenateparts

  {cat "html-before-html-example.tmp" "externalfilterinputfile" "html-after-html-example.tmp" > "tmp.html";}

defhtmlobtainpng

  {webkit2png

   %--dir="auxfiles" % doesn't work correctly with externalfilter

   --fullsize

   --width=1 % to get the minimum

   --height=1 % to get the minimum

   --scale=1 % unused

   --filename="externalfilterbasefile"

   "tmp.html";}



% {firefoxpath/firefox

%  -screenshot

%  "externalfilteroutputfile"

%  "externalfilterinputfile"}



% {chromepath/Google Chrome

%  --headless

%  --screenshot="externalfilteroutputfile"

%  "externalfilterinputfile"}



starttext



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



starthtmlexample

  <strong>Hello</strong>, <em>world</em>

stophtmlexample



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



starthtmlexample

  <pre>

     1   2   3   4   5   6   7   <b>Forever,</b><br/>

     8   9  10  11  12  13  14      and ever.<br/>

    15  16  17  18  19  20  21

  </pre>

stophtmlexample



Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure inlinehtml{<b>alo</b>} dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.



stopchapter



stoptext






share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 18 at 14:54

























answered Nov 17 at 14:36









Manuel

21k845105




21k845105












  • For directory=output to work, you need to create the directory on your own.
    – Aditya
    Nov 18 at 7:07










  • For adding before and after content, search for bufferbefore and bufferafter in the documentation of the filter module
    – Aditya
    Nov 18 at 7:13










  • I see, still it doesn't work entirely well (or as expected) with webkit2png so I decided not to use it. And bufferbefore and bufferafter is of no use, because I want to input certain things, and then print those things while processing a different one. For now I think I could rely on bash commands, but I wrote this question in case someone showed a nice solution that is entirely ConTeXt / Lua, rather than hacks here and there.
    – Manuel
    Nov 18 at 13:07










  • Does webkit2png --filename=html/test.tmp html/test.png work from the command line? If so, then it should also work from within the filter module. Regarding bufferbeforr etc, I don't understand what you mean by print those things while processing a different one. Can you give an example?
    – Aditya
    Nov 18 at 14:28










  • I updated the answer. Well, the idea is to write in the example only a part of the whole file that is processed. So if I write starthtmlexample <b>bold</bold> stophtmlexample I want the file to be processed to have <html><body><b>bold</b></body></html> for example.
    – Manuel
    Nov 18 at 14:56


















  • For directory=output to work, you need to create the directory on your own.
    – Aditya
    Nov 18 at 7:07










  • For adding before and after content, search for bufferbefore and bufferafter in the documentation of the filter module
    – Aditya
    Nov 18 at 7:13










  • I see, still it doesn't work entirely well (or as expected) with webkit2png so I decided not to use it. And bufferbefore and bufferafter is of no use, because I want to input certain things, and then print those things while processing a different one. For now I think I could rely on bash commands, but I wrote this question in case someone showed a nice solution that is entirely ConTeXt / Lua, rather than hacks here and there.
    – Manuel
    Nov 18 at 13:07










  • Does webkit2png --filename=html/test.tmp html/test.png work from the command line? If so, then it should also work from within the filter module. Regarding bufferbeforr etc, I don't understand what you mean by print those things while processing a different one. Can you give an example?
    – Aditya
    Nov 18 at 14:28










  • I updated the answer. Well, the idea is to write in the example only a part of the whole file that is processed. So if I write starthtmlexample <b>bold</bold> stophtmlexample I want the file to be processed to have <html><body><b>bold</b></body></html> for example.
    – Manuel
    Nov 18 at 14:56
















For directory=output to work, you need to create the directory on your own.
– Aditya
Nov 18 at 7:07




For directory=output to work, you need to create the directory on your own.
– Aditya
Nov 18 at 7:07












For adding before and after content, search for bufferbefore and bufferafter in the documentation of the filter module
– Aditya
Nov 18 at 7:13




For adding before and after content, search for bufferbefore and bufferafter in the documentation of the filter module
– Aditya
Nov 18 at 7:13












I see, still it doesn't work entirely well (or as expected) with webkit2png so I decided not to use it. And bufferbefore and bufferafter is of no use, because I want to input certain things, and then print those things while processing a different one. For now I think I could rely on bash commands, but I wrote this question in case someone showed a nice solution that is entirely ConTeXt / Lua, rather than hacks here and there.
– Manuel
Nov 18 at 13:07




I see, still it doesn't work entirely well (or as expected) with webkit2png so I decided not to use it. And bufferbefore and bufferafter is of no use, because I want to input certain things, and then print those things while processing a different one. For now I think I could rely on bash commands, but I wrote this question in case someone showed a nice solution that is entirely ConTeXt / Lua, rather than hacks here and there.
– Manuel
Nov 18 at 13:07












Does webkit2png --filename=html/test.tmp html/test.png work from the command line? If so, then it should also work from within the filter module. Regarding bufferbeforr etc, I don't understand what you mean by print those things while processing a different one. Can you give an example?
– Aditya
Nov 18 at 14:28




Does webkit2png --filename=html/test.tmp html/test.png work from the command line? If so, then it should also work from within the filter module. Regarding bufferbeforr etc, I don't understand what you mean by print those things while processing a different one. Can you give an example?
– Aditya
Nov 18 at 14:28












I updated the answer. Well, the idea is to write in the example only a part of the whole file that is processed. So if I write starthtmlexample <b>bold</bold> stophtmlexample I want the file to be processed to have <html><body><b>bold</b></body></html> for example.
– Manuel
Nov 18 at 14:56




I updated the answer. Well, the idea is to write in the example only a part of the whole file that is processed. So if I write starthtmlexample <b>bold</bold> stophtmlexample I want the file to be processed to have <html><body><b>bold</b></body></html> for example.
– Manuel
Nov 18 at 14:56


















 

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