Add yada functionality to serve a local system directory or file

[luciodale]

Usage examples:

From your config.edn:

Serve directory:

...
:ig.system/base
{[:my.project/foo :edge.yada.ig/external-directories]
 {:path "/home/user/target/folder/"
  :options {:custom-suffices [...]
            :index-files [...]
             ...}}
...

And in your edge.bidi.ig/vhost:

["/foo/" #ig/ref [:my.project/foo :edge.yada.ig/external-directories]]

Serve single file:

...
:ig.system/base
{[:my.project/bar :edge.yada.ig/external-files]
 {:path "/home/user/target/folder/file.txt"
  :options {:produces [...]
              ...}}
...

And in your edge.bidi.ig/vhost:

["/file" #ig/ref [:my.project/bar :edge.yada.ig/external-files]]

[SevereOverfl0w]

Can you also add docs to doc/resources/doc/sources/built-in-libraries.adoc

[SevereOverfl0w]

You need to require this namespace before using it. See requiring-resolve below.

[SevereOverfl0w]

Maybe directory-resource is better? Then it can rely on the existing known name.

[luciodale]

Isn't resource not ideal because the directory won't be on the classpath?

[SevereOverfl0w]

Resource would refer to web resource in this context, same as in yada

[SevereOverfl0w]

file-resource is perhaps better