[jira] [Commented] (DOXIA-617) doxia-module-markdown: Add support for --- header section marks

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DOXIA-617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17653604#comment-17653604 ] 

ASF GitHub Bot commented on DOXIA-617:
--------------------------------------

bertysentry commented on PR #132:
URL: https://github.com/apache/maven-doxia/pull/132#issuecomment-1368957114

   Actually, the regexp should be: `^\v*((?:[a-zA-Z0-9_\-]+\h*:.*\R)+)\R`. It will match with the header if present.
   
   Using Java 8's [Matcher](https://docs.oracle.com/javase/8/docs/api/java/util/regex/Matcher.html) we should be able to implement that mechanism (adding `---` where necessary) could be done in a very efficient way.




> doxia-module-markdown: Add support for --- header section marks
> ---------------------------------------------------------------
>
>                 Key: DOXIA-617
>                 URL: https://issues.apache.org/jira/browse/DOXIA-617
>             Project: Maven Doxia
>          Issue Type: Improvement
>          Components: Module - Markdown
>            Reporter: Bertrand Martin
>            Priority: Major
>             Fix For: 1.12.0, 2.0.0-M5
>
>
> h1. Use Case
> It is "generally" accepted that document header metadata in Markdown (like _title_, _author_, etc.) must be specified inside a header section, delimited with 3 hypens:
> {noformat}
> ---
> title: My Doc Title
> author: Myself
> keywords: great,doc
> ---
> # Introduction
> ...
> {noformat}
> See:
> * https://bookdown.org/yihui/rmarkdown/html-document.html
> * https://pandoc.org/MANUAL.html#extension-yaml_metadata_block
> * https://github.com/vsch/flexmark-java/wiki/Extensions#yaml-front-matter
> Currently, the only supported syntax for document header metadata is the very same as above, but *without* the 3 hypens marking the header section:
> {noformat}
> title: My Doc Title
> author: Myself
> keywords: great,doc
> # Introduction
> ...
> {noformat}
> h1. Specification
> Enable the YAML Front Matter Extension of Flexmark so that such header is processed automatically (nothing to code here!)
> Keep the default behavior (we want backward compatibility) with the parsing of metadatas (which won't be affected by the YAML Front Matter parsing).
> h1. Doc
> Update the documentation on how to use Markdown in Doxia. This feature (document metadata) is currently not documented.
> We should have a small guide on how to use Markdown in Doxia, and its specific features (metadatas, macros, etc.)
> h1. Test
> Add corresponding unit tests and integration tests (for both old and new syntaxes)



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