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Subject: buffer-file-name in [* Org src *] buffers
Date: Sun, 11 Mar 2018 18:56:48 -0400
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To: emacs-orgmode@gnu.org

Hi all,

TL;DR: why does org-src-mode-configure-edit-buffer set buffer-file-name to a non-nil value?  https://code.orgmode.org/bzg/org-mode/commit/4b6988bf36cb458c9d113ee4332e016990c1eb04#diff-ea848b037ba2c0bf95915700bb6f4e539d80d8cR486

Background information: I'm reviewing a patch (https://github.com/flycheck/flycheck/pull/1426) to enable Flycheck in temporary buffers created by org-mode while editing a code snippet with org-edit-src-code (among others).  The patch teaches Flycheck to append an checker-appropriate extension to the temporary files that it creates: for example, when editing a Python snippet from an Org file, Flycheck would now create a file named /tmp/<random string>.py instead of /tmp/<random string> (which would make Python happy).

We're thinking of enabling this automatic suffix addition behavior only for buffers that do not have a buffer-file-name currently set (in the ones that do, Flycheck already derives file names for its temporary files from the buffer's  file name), but we were surprised to find that [* Org src *] actually have a buffer-file-name.

Why is that?

Thanks,
Clément.