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100 lines
3.0 KiB
100 lines
3.0 KiB
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# Permissive URL Autolinks
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With the flag `MD_FLAG_PERMISSIVEURLAUTOLINKS`, MD4C enables more permissive recognition
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of URLs and transform them to autolinks, even if they do not exactly follow the syntax
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of autolink as specified in CommonMark specification.
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This is a standard CommonMark autolink:
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```````````````````````````````` example
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Homepage: <https://github.com/mity/md4c>
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.
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<p>Homepage: <a href="https://github.com/mity/md4c">https://github.com/mity/md4c</a></p>
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````````````````````````````````
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With the permissive autolinks enabled, this is sufficient:
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```````````````````````````````` example
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Homepage: https://github.com/mity/md4c
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.
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<p>Homepage: <a href="https://github.com/mity/md4c">https://github.com/mity/md4c</a></p>
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````````````````````````````````
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But this permissive autolink feature can work only for very widely used URL
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schemes, in alphabetical order `ftp:`, `http:`, `https:`.
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That's why this is not a permissive autolink:
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```````````````````````````````` example
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ssh://root@example.com
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.
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<p>ssh://root@example.com</p>
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````````````````````````````````
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The same rules for path validation as for permissivve WWW autolinks apply.
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Therefore the final question mark here is not part of the autolink:
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```````````````````````````````` example
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Have you ever visited http://www.zombo.com?
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.
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<p>Have you ever visited <a href="http://www.zombo.com">http://www.zombo.com</a>?</p>
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````````````````````````````````
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But in contrast, in this example it is:
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```````````````````````````````` example
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http://www.bing.com/search?q=md4c
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.
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<p><a href="http://www.bing.com/search?q=md4c">http://www.bing.com/search?q=md4c</a></p>
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````````````````````````````````
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And finally one complex example:
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```````````````````````````````` example
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http://commonmark.org
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(Visit https://encrypted.google.com/search?q=Markup+(business))
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Anonymous FTP is available at ftp://foo.bar.baz.
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.
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<p><a href="http://commonmark.org">http://commonmark.org</a></p>
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<p>(Visit <a href="https://encrypted.google.com/search?q=Markup+(business)">https://encrypted.google.com/search?q=Markup+(business)</a>)</p>
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<p>Anonymous FTP is available at <a href="ftp://foo.bar.baz">ftp://foo.bar.baz</a>.</p>
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````````````````````````````````
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## GitHub Issues
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### [Issue 53](https://github.com/mity/md4c/issues/53)
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```````````````````````````````` example
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This is [link](http://github.com/).
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.
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<p>This is <a href="http://github.com/">link</a>.</p>
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````````````````````````````````
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```````````````````````````````` example
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This is [link](http://github.com/)X
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.
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<p>This is <a href="http://github.com/">link</a>X</p>
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````````````````````````````````
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## [Issue 76](https://github.com/mity/md4c/issues/76)
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```````````````````````````````` example
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*(http://example.com)*
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.
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<p><em>(<a href="http://example.com">http://example.com</a>)</em></p>
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````````````````````````````````
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## [Issue 152](https://github.com/mity/md4c/issues/152)
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```````````````````````````````` example
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[http://example.com](http://example.com)
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.
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<p><a href="http://example.com">http://example.com</a></p>
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````````````````````````````````
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