Getting actual path to file from pxf:info on case-insensitive filesystems

[dwcramer]

I'm using pxf:info to see if images that a document refers to are available. Local builds happen on MacOS, which is typically case insensitive, but remote builds happen on a case-sensitive filesystem.

If I refer to an image file, Alice.jpg, three times, as alice.jpg, Alice.jpg, and aLice.jpg, in the case-insensitive environment pxf:info tells me each time that the file is there, but doesn't tell me what the case of the file on the filesystem actually is:

<?xml version="1.0" encoding="UTF-8"?>
<results xmlns="http://www.w3.org/ns/xproc-step">
   <c:file xmlns:c="http://www.w3.org/ns/xproc-step"
           href="file:/Users/dcramer/diff-test/diff-test1/images/alice.jpg"
           readable="true"
           size="117494"
           last-modified="2018-03-28T14:58:13Z"/>
   <c:file xmlns:c="http://www.w3.org/ns/xproc-step"
           href="file:/Users/dcramer/diff-test1/images/Alice.jpg"
           readable="true"
           size="117494"
           last-modified="2018-03-28T14:58:13Z"/>
   <c:file xmlns:c="http://www.w3.org/ns/xproc-step"
           href="file:/Users/dcramer/diff-test1/images/aLice.jpg"
           readable="true"
           size="117494"
           last-modified="2018-03-28T14:58:13Z"/>
</results>

It would be great if there were a way to get the actual spelling of the path to the file, even in a case-insensitive environment so I could compare that with the path to the file in the document and warn the user that this doc will not build on the build machine.