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Re: Toward 0.2

From: Ludovic Courtès
Subject: Re: Toward 0.2
Date: Fri, 01 Mar 2013 18:28:00 +0100
User-agent: Gnus/5.130005 (Ma Gnus v0.5) Emacs/24.2 (gnu/linux)

Nikita Karetnikov <address@hidden> skribis:

>> It’s not needed.  All that needed is the name of the executable file
>> to wrap.
> I don't understand.  How will 'rename-file' get the location of the
> executable?  For example:
> (wrap-program "wget" [...])
> I guess that it will only work if you invoke 'wrap-program' from the
> same directory.

Yes, and that’s what we want.

However, the ‘exec’ line in the wrapper needs the absolute file name.
For that it can do along the lines of:

  (string-append "exec " (canonicalize-path file))

>> For the case where there are have several variables you want to set.
> Could you provide an example?  The following works without '#:rest':
> (display (wrap-program "wget" '(("PATH" ":" = ("/nix/.../gawk/bin"))
>                                 ("CERT_PATH" ":" suffix 
> ("/nix/.../share/certs"
> "/nix/.../foo/certs")))))

Yeah there are two choices: two required arguments (like above), where
the second one is a list, or one required argument and one rest

In the latter case, you would instead do:

  (wrap-program "wget" '("PATH" ":" = ("/nix/.../gawk/bin"))
                       '("CERT_PATH" ":" suffix ("/nix/.../share/certs"

I tend to prefer this form because it may be more concise in common


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