Reading yaml metadata

Reading yaml metadata

[ss2]

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Hello Everyone,

I'm simply trying to read a markup file (org in this case). I'm able to 
read its contents but not the metadata. I've tried reading the 
documentation and looking at a few examples and I'm not sure what I'm doing 
wrong. The code snippet and file I'm reading are attached below. Here is 
the output when calling the function:

Right (Pandoc (Meta {unMeta = fromList []}) [Para [Str 
"\8212",SoftBreak,Str "title:",Space,Str "The",Space,Str 
"document",Space,Str "title",SoftBreak,Str "author:"],BulletList [[Plain 
[Str "name:",Space,Str "Author",Space,Str "One",SoftBreak,Str 
"affiliation:",Space,Str "University",Space,Str "of",Space,Str 
"Somewhere"]],[Plain [Str "name:",Space,Str "Author",Space,Str 
"Two",SoftBreak,Str "affiliation:",Space,Str "University",Space,Str 
"of",Space,Str "Nowhere"]]],Para [Str "\8230"],Header 1 ("",[],[]) [Str 
"Root"],Header 1 ("",[],[]) [Str "Nav"],BulletList [[Plain [Link ("",[],[]) 
[Str "posts"] ("posts/hello-world.org","")]],[Plain [Link ("",[],[]) [Str 
"stream"] ("stream.org","")]]],Para [Str "About",Space,Str "me."]])

As you can see the metadata is empty even though there is a yaml metadata 
block in the source file.

My build depends on pandoc >= 3.1  && < 3.2 and pandoc-types >= 1.23.

Any help would be greatly appreciated!!

Best,
P

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[-- Attachment #2: root.org --]
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---
title: The document title
author:
- name: Author One
  affiliation: University of Somewhere
- name: Author Two
  affiliation: University of Nowhere
...

* Root

* Nav
- [[file:posts/hello-world.org][posts]]
- [[file:stream.org][stream]]

About me.

[-- Attachment #3: Example.hs --]
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import qualified Data.Text as T
import Text.Pandoc

-- Read an org document with a yaml metadata block and print it
printDocWithMetaData :: IO ()
printDocWithMetaData = do
  input <- readFile "root.org"
  let readerOpts = def {
    readerStandalone = True,
    readerExtensions = extensionsFromList [Ext_yaml_metadata_block]
  }
  doc <- runIO $ readOrg readerOpts (T.pack input)
  print doc

Re: Reading yaml metadata

[ss2]

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Maybe attaching the files was inconvenient.

Haskell code
```
import qualified Data.Text as T
import Text.Pandoc
import Text.Pandoc.Walk (query)

-- Extract YAML metadata from document
getMetaData :: Pandoc -> Meta
getMetaData (Pandoc meta _) = meta

-- Read an org document with a yaml metadata block and print it
printDocWithMetaData :: IO ()
printDocWithMetaData = do
  input <- readFile "root.org"
  let readerOpts = def {
    readerStandalone = True,
    readerExtensions = enableExtension Ext_yaml_metadata_block 
(getDefaultExtensions $ T.pack "org")
  }
  eitherDoc <- runIO $ readOrg readerOpts (T.pack input)
  doc <- handleError eitherDoc
  let metaData = getMetaData doc
  print metaData
```

Input file (root.org):
```
---
title: Hello, World!
author:
  - name: Your Name
    affiliation: Your Affiliation
---

* Introduction

Hello, World! This is a simple org-mode document with a YAML header.

* Conclusion

Thank you for reading!
```

Std out:
```Meta {unMeta = fromList []}```

The input file contains a yaml metadata block yet the pandoc reader isn't 
extracting it.


On Sunday, December 10, 2023 at 11:03:41 PM UTC-6 ss2 wrote:

> Hello Everyone,
>
> I'm simply trying to read a markup file (org in this case). I'm able to 
> read its contents but not the metadata. I've tried reading the 
> documentation and looking at a few examples and I'm not sure what I'm doing 
> wrong. The code snippet and file I'm reading are attached below. Here is 
> the output when calling the function:
>
> Right (Pandoc (Meta {unMeta = fromList []}) [Para [Str 
> "\8212",SoftBreak,Str "title:",Space,Str "The",Space,Str 
> "document",Space,Str "title",SoftBreak,Str "author:"],BulletList [[Plain 
> [Str "name:",Space,Str "Author",Space,Str "One",SoftBreak,Str 
> "affiliation:",Space,Str "University",Space,Str "of",Space,Str 
> "Somewhere"]],[Plain [Str "name:",Space,Str "Author",Space,Str 
> "Two",SoftBreak,Str "affiliation:",Space,Str "University",Space,Str 
> "of",Space,Str "Nowhere"]]],Para [Str "\8230"],Header 1 ("",[],[]) [Str 
> "Root"],Header 1 ("",[],[]) [Str "Nav"],BulletList [[Plain [Link ("",[],[]) 
> [Str "posts"] ("posts/hello-world.org","")]],[Plain [Link ("",[],[]) [Str 
> "stream"] ("stream.org","")]]],Para [Str "About",Space,Str "me."]])
>
> As you can see the metadata is empty even though there is a yaml metadata 
> block in the source file.
>
> My build depends on pandoc >= 3.1  && < 3.2 and pandoc-types >= 1.23.
>
> Any help would be greatly appreciated!!
>
> Best,
> P
>

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Re: Reading yaml metadata

['William Lupton' via pandoc-discuss]

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I don't use org myself, but I'm wondering whether the org reader supports
YAML metadata blocks.

*% *pandoc --list-extensions=org

-ascii_identifiers

+auto_identifiers

+citations

-east_asian_line_breaks

-fancy_lists

-gfm_auto_identifiers

-smart

+task_lists

On Tue, 12 Dec 2023 at 01:27, ss2 <okubo.peyton-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> Maybe attaching the files was inconvenient.
>
> Haskell code
> ```
> import qualified Data.Text as T
> import Text.Pandoc
> import Text.Pandoc.Walk (query)
>
> -- Extract YAML metadata from document
> getMetaData :: Pandoc -> Meta
> getMetaData (Pandoc meta _) = meta
>
> -- Read an org document with a yaml metadata block and print it
> printDocWithMetaData :: IO ()
> printDocWithMetaData = do
>   input <- readFile "root.org"
>   let readerOpts = def {
>     readerStandalone = True,
>     readerExtensions = enableExtension Ext_yaml_metadata_block
> (getDefaultExtensions $ T.pack "org")
>   }
>   eitherDoc <- runIO $ readOrg readerOpts (T.pack input)
>   doc <- handleError eitherDoc
>   let metaData = getMetaData doc
>   print metaData
> ```
>
> Input file (root.org):
> ```
> ---
> title: Hello, World!
> author:
>   - name: Your Name
>     affiliation: Your Affiliation
> ---
>
> * Introduction
>
> Hello, World! This is a simple org-mode document with a YAML header.
>
> * Conclusion
>
> Thank you for reading!
> ```
>
> Std out:
> ```Meta {unMeta = fromList []}```
>
> The input file contains a yaml metadata block yet the pandoc reader isn't
> extracting it.
>
>
> On Sunday, December 10, 2023 at 11:03:41 PM UTC-6 ss2 wrote:
>
>> Hello Everyone,
>>
>> I'm simply trying to read a markup file (org in this case). I'm able to
>> read its contents but not the metadata. I've tried reading the
>> documentation and looking at a few examples and I'm not sure what I'm doing
>> wrong. The code snippet and file I'm reading are attached below. Here is
>> the output when calling the function:
>>
>> Right (Pandoc (Meta {unMeta = fromList []}) [Para [Str
>> "\8212",SoftBreak,Str "title:",Space,Str "The",Space,Str
>> "document",Space,Str "title",SoftBreak,Str "author:"],BulletList [[Plain
>> [Str "name:",Space,Str "Author",Space,Str "One",SoftBreak,Str
>> "affiliation:",Space,Str "University",Space,Str "of",Space,Str
>> "Somewhere"]],[Plain [Str "name:",Space,Str "Author",Space,Str
>> "Two",SoftBreak,Str "affiliation:",Space,Str "University",Space,Str
>> "of",Space,Str "Nowhere"]]],Para [Str "\8230"],Header 1 ("",[],[]) [Str
>> "Root"],Header 1 ("",[],[]) [Str "Nav"],BulletList [[Plain [Link ("",[],[])
>> [Str "posts"] ("posts/hello-world.org","")]],[Plain [Link ("",[],[])
>> [Str "stream"] ("stream.org","")]]],Para [Str "About",Space,Str "me."]])
>>
>> As you can see the metadata is empty even though there is a yaml metadata
>> block in the source file.
>>
>> My build depends on pandoc >= 3.1  && < 3.2 and pandoc-types >= 1.23.
>>
>> Any help would be greatly appreciated!!
>>
>> Best,
>> P
>>
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> "pandoc-discuss" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/pandoc-discuss/c1b6d4fe-8cd5-482c-b351-be20a658b8d3n%40googlegroups.com
> <https://groups.google.com/d/msgid/pandoc-discuss/c1b6d4fe-8cd5-482c-b351-be20a658b8d3n%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>

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