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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Got to ask this about GPS: Do others have the same problems with
 Python?
Date: Wed, 04 Mar 2020 15:04:25 +0000
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Date: 2020-03-04T15:04:25+00:00
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Rick Newbie <nuttin@nuttn.nowhere> writes:

> For instance: I create a procedure header in an ADS file then use the
> "Generate Body Of ..." from the context menu and I get this in the
> output window:

Not just Windows! On macOS, the first time I tried it (on a spec that
shouldn't have had a body) I got

   gnat stub -P/Users/simon/tmp/so/rules.gpr /Users/simon/tmp/so/rules.ads /Users/simon/tmp/so/

but no .adb.

The second time, I got the same output as you describe (modulo Windows
vs Unix).

The third time, after I added a subprogram (so a body was valid), it
worked.

The fourth time, after I removed the subprogram, back we are with your
error!

Traceback (most recent call last):
  File "/opt/gnat-ce-2019/share/gps/support/core/gps_utils/__init__.py", line 352, in do
    r = callback()
  File "/opt/gnat-ce-2019/share/gps/support/core/gnatstub.py", line 173, in generate_plain_body
    generate_body(as_separate=False)
  File "/opt/gnat-ce-2019/share/gps/support/core/gnatstub.py", line 153, in generate_body
    command += x_args + [file.path, file.directory()]
AttributeError: 'NoneType' object has no attribute 'path'

If I run the command that GPS says it's executing by hand, I get

$ gnat stub -P/Users/simon/tmp/so/rules.gpr /Users/simon/tmp/so/rules.ads /Users/simon/tmp/so/
gnatstub: tree file rules.adt already exists use -r or -t to reuse or to overwrite it

so I use -t and get

$ gnat stub -t -P/Users/simon/tmp/so/rules.gpr /Users/simon/tmp/so/rules.ads /Users/simon/tmp/so/
gnatstub: Compilation unit Rules does not require a body

(and rules.adt has been deleted, so I don't need to use -t next time).