Pass parameters to filter?

Pass parameters to filter?

[Ranjit Jhala]

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Hi,

Is there an easy way to pass parameters to a filter? For example, 
suppose I want to pass in a path to some file that will be used as 
a template by the filter. Is there an easy way to pass this path along?

I tried 

    pandoc --filter codeblock.hs path

but that doesn't work. Any clues?

Thanks!

Ranjit.

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Re: Pass parameters to filter?

['Jason Seeley' via pandoc-discuss]

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You could pass parameters as Metadata variables using "-M param=value" or 
'--metadata=param:value". The metadata is available to filters. (I'm not 
too familiar with how to access it with Haskell, but I know it is in the 
"unMeta" dictionary at the top of the json format of the document.)

Jason

On Sunday, March 1, 2015 at 8:37:00 AM UTC-6, Ranjit Jhala wrote:
>
> Hi,
>
> Is there an easy way to pass parameters to a filter? For example, 
> suppose I want to pass in a path to some file that will be used as 
> a template by the filter. Is there an easy way to pass this path along?
>
> I tried 
>
>     pandoc --filter codeblock.hs path
>
> but that doesn't work. Any clues?
>
> Thanks!
>
> Ranjit.
>
>

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Re: Pass parameters to filter?

[John MacFarlane]

Another possibility is to set an environment variable and read it in
your filter.

+++ 'Jason Seeley' via pandoc-discuss [Mar 01 15 16:40 ]:
>You could pass parameters as Metadata variables using "-M param=value" or
>'--metadata=param:value". The metadata is available to filters. (I'm not
>too familiar with how to access it with Haskell, but I know it is in the
>"unMeta" dictionary at the top of the json format of the document.)
>
>Jason
>
>On Sunday, March 1, 2015 at 8:37:00 AM UTC-6, Ranjit Jhala wrote:
>>
>> Hi,
>>
>> Is there an easy way to pass parameters to a filter? For example,
>> suppose I want to pass in a path to some file that will be used as
>> a template by the filter. Is there an easy way to pass this path along?
>>
>> I tried
>>
>>     pandoc --filter codeblock.hs path
>>
>> but that doesn't work. Any clues?
>>
>> Thanks!
>>
>> Ranjit.
>>
>>
>
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Re: Pass parameters to filter?

[Ranjit Jhala]

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Great, Thanks! both of these would work (somehow missed the unMeta thing...)

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Re: Pass parameters to filter?

[Ranjit Jhala]

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Hmm. Can you give a concrete example of using the environment variables?

My attempts end up failing with the odd error:

pandoc: Failed reading: satisfy

I get this no matter what `IO` action I try (including just reading some 
random file before calling toJsonFilter)
 

>
>

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Re: Pass parameters to filter?

[Ranjit Jhala]

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To be precise: I get the below error when my code is:

main :: IO ()
main = do tgt <- readFile "dist/PANDOC"
          putStrLn $ "Pandoc TARGET: " ++ tgt
          txFigHtml

but everything works fine if I remove the first two lines (i.e. just use 
`txFigHtml`) ?

On Monday, March 2, 2015 at 3:28:12 PM UTC-8, Ranjit Jhala wrote:
>
> Hmm. Can you give a concrete example of using the environment variables?
>
> My attempts end up failing with the odd error:
>
> pandoc: Failed reading: satisfy
>
> I get this no matter what `IO` action I try (including just reading some 
> random file before calling toJsonFilter)
>  
>
>>
>>

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Re: Pass parameters to filter?

[Ranjit Jhala]

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The problem is with `putStrLn` -- if I instead use `trace` from Debug.Trace 
its fine...

main :: IO ()
main = do tgt <- readFile "dist/PANDOC"
          trace ("Pandoc TARGET: " ++ tgt) txFigHtml

On Monday, March 2, 2015 at 3:30:01 PM UTC-8, Ranjit Jhala wrote:
>
> To be precise: I get the below error when my code is:
>
> main :: IO ()
> main = do tgt <- readFile "dist/PANDOC"
>           putStrLn $ "Pandoc TARGET: " ++ tgt
>           txFigHtml
>
> but everything works fine if I remove the first two lines (i.e. just use 
> `txFigHtml`) ?
>
> On Monday, March 2, 2015 at 3:28:12 PM UTC-8, Ranjit Jhala wrote:
>>
>> Hmm. Can you give a concrete example of using the environment variables?
>>
>> My attempts end up failing with the odd error:
>>
>> pandoc: Failed reading: satisfy
>>
>> I get this no matter what `IO` action I try (including just reading some 
>> random file before calling toJsonFilter)
>>  
>>
>>>
>>>

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Re: Pass parameters to filter?

[Tillmann Rendel]

Hi,

Ranjit Jhala wrote:
> To be precise: I get the below error when my code is:
>
> main ::IO ()
> main = do tgt <-readFile "dist/PANDOC"
>           putStrLn $ "Pandoc TARGET: "++tgt
>           txFigHtml
>
> but everything works fine if I remove the first two lines (i.e. just use
> `txFigHtml`) ?

Your program is run as a filter by pandoc, so everything your program 
prints to the the standard output stream (stdout) will get redirected to 
pandoc. Including whatever `putStrLn $ "Pandoc TARGET: "++tgt` prints. 
Pandoc doesn't know how to understand that information, of course, so 
you get a (not really satisfying) error message.

To print some debugging information to the user, try the standard error 
stream (stderr):

> import System.IO (hPutStrLn, stderr);
> ...
> hPutStrLn stderr $ "Pandoc TARGET: " ++ tgt

   Tillmann

Re: Pass parameters to filter?

[Ranjit Jhala]

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Terrific, thanks for the explanation Tillmann! Ranjit.

On Monday, March 2, 2015 at 3:46:59 PM UTC-8, Tillmann Rendel wrote:
>
> Hi, 
>
> Ranjit Jhala wrote: 
> > To be precise: I get the below error when my code is: 
> > 
> > main ::IO () 
> > main = do tgt <-readFile "dist/PANDOC" 
> >           putStrLn $ "Pandoc TARGET: "++tgt 
> >           txFigHtml 
> > 
> > but everything works fine if I remove the first two lines (i.e. just use 
> > `txFigHtml`) ? 
>
> Your program is run as a filter by pandoc, so everything your program 
> prints to the the standard output stream (stdout) will get redirected to 
> pandoc. Including whatever `putStrLn $ "Pandoc TARGET: "++tgt` prints. 
> Pandoc doesn't know how to understand that information, of course, so 
> you get a (not really satisfying) error message. 
>
> To print some debugging information to the user, try the standard error 
> stream (stderr): 
>
> > import System.IO (hPutStrLn, stderr); 
> > ... 
> > hPutStrLn stderr $ "Pandoc TARGET: " ++ tgt 
>
>    Tillmann 
>

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