[PATCH] Accept more :tangle-mode specification forms

[Timothy]

Hello,

Currently, the only way to set a file mode when tangling seems to be 
:tangle-mode (identity #o755)

In a [prior thread], Jeremy proposed that :tangle-mode should convert octal
number strings to the required decimal form. I think we should go further, and
so have prepared the attached patch based on a snippet I shared in the thread.

To quote the docstring of the new function I’m introducing, this patch now
accepts the following :tangle-mode forms:
• an integer (returned without modification)
• “#o755” (elisp-style octal)
• “0755” (c style octal)
• “755” (chmod style octal)
• “rwxrw-r–” (ls style specification)
• “a=rw,u+x” (chmod style)
• “rwx” (interpreted as “u=rwx”)

Why be so permissive? I’d refer you to my reasoning in the prior thread:

I think there are a few arguably “sensible” formats that a user could reasonably
assume, and if we can support most of them without introducing ambiguity in
parsing or interpretation (and I think we can), can’t we make everyone happy?

All the best,
Timothy


[prior thread] 
<20210928145448.245883-1-jeremy@cowgar.com/">https://list.orgmode.org/20210928145448.245883-1-jeremy@cowgar.com/>

0001-ob-tangle-Accept-more-tangle-mode-forms.patch
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