[Gambas-user] patch for setting directory on EXEC

[Ian Haywood]

as part of my app, I run the LaTeX typesetting program via EXEC in Gambas

To cut a long story short, latex likes to be an a specific current
directory, which isn't possible in Gambas: EXEC always runs the in the
directory the interpreter was started in, Currently I use SHELL
instead and do something like "cd the/directory/i/want ; latex
input.tex", but
this is inefficient (I have no other need of a subshell) and generally
feels kludgy.

This patch basically makes EXEC respect the PWD environment variable:
if PWD is set using the WITH keyword option to EXEC then
this is the current directory for the process spawned by EXEC.

Ian
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