[Scons-users] Errors in "Using scanners with Builders" example

[Bill Deegan]

Andreas,

Pull requests with corrections are always welcome!

-Bill

On Tue, Jan 30, 2024 at 8:16 AM Andreas Gustafsson <gson at gson.org> wrote:

> Hello Mats,
>
> Thank you for your quick response!
>
> You wrote:
> > The user guide examples are, in fact, usually processed, to produce the
> > command output you see with many of the examples.  However this example
> > isn't listed as an "scons_example" element, which triggers that
> > processing, but as a plain "programlisting", which gets no processing.
> > Don't know why, perhaps designing a complete runnable example here
> > didn't seem feasible to the author.  I also notice that the earlier
> > example, in section 20.1, *is* entered as an "scons_example", but then
> > the incantation to cause the code to be run and the results captured is
> > commented out.  Will look into why - I'll file the ticket.
>
> Speaking of that example, I found it really confusing.  It starts out
> by saying:
>
>   Suppose, for example, that we want to create a simple Scanner
>   for .foo files.
>
> but the example code that follows seems to deal with .k files,
> not .foo files.
>
> Then, if I want to try actually running the example code, I will
> presumably have to create my own "kprocess" script.  But no matter
> where I put it, scons won't actually execute it, because of the line
>
>   env = Environment(ENV={'PATH': '/usr/local/bin'})
>
> which overrides the PATH such that scons not only can't find the
> kprocess script itself, but apparently can't even find a shell to run
> it with.  Even installing the script in /usr/local/bin does not help:
>
>   $ ls -l /usr/local/bin/kprocess
>   -rwxr-xr-x 1 gson gson 4 Jan 30 18:00 /usr/local/bin/kprocess
>   $ cat /usr/local/bin/kprocess
>   cat
>   $ scons
>   scons: Reading SConscript files ...
>   scons: done reading SConscript files.
>   scons: Building targets ...
>   kprocess < foo.k > foo
>   scons: *** [foo] sh: No such file or directory
>
> I figure the PATH override is for the benefit of the automated test,
> but surely there is some way to do it without breaking things for
> human users.
>
> Regards,
> --
> Andreas Gustafsson, gson at gson.org
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