[Click] preprocessing click configuration files

[Marco Canini]

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I thought I'd share this with the list.
I found a pretty cool text preprocessor similar to the C preprocessor.
It got developed by Mozilla.
You can download it here
http://mxr.mozilla.org/mozilla-central/source/config/preprocessor.pl?raw=1

You can find the docs here
http://developer.mozilla.org/en/docs/Build:Text_Preprocessor

It has more features then a C preprocessor.
One of them that I really needed is variable substitution which can be
combined with the ability to import all the environment variables.
I tend to run it like this:
preprocessor.pl -E -Fsubstitution

So, if I had an environment variable, say DAG, I can do something like
this without the hassle of using the cmd line argument -DDAG:
From at DAG@Dump(-, STOP true, FORCE_IP true)->

Another example: I like to have some form of feedback during trace
analysis so I add this to my configs:

#ifndef QUIET
Script(
label rate_stats,
printn "\rPkts: ",
printn c.count,
printn "\tBytes: ",
printn c.byte_count,
printn "\tPkt/s: ",
printn c.rate,
printn "          ",
wait 1s,
goto rate_stats
);
#endif

and when I don't want verbose output I can just execute click with
QUIET=1 click config.click

Hope someone will find this stuff useful.
Cheers

- --
Marco Canini
Ph.D. Candidate
Department of Communication, Computer and System Sciences
University of Genoa
Via all'Opera Pia 13
16145 Genoa Italy
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