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Re: What config file for a .pm perl module ?

On Thu, Dec 27, 2001 at 09:19:16AM -0600, Steve Langasek wrote:
<chomp />
> My own approach?  Write your own parser for a simple 'key = value' style 
> config file.  This can usually be done in ten lines or less[1] using
> perl's powerful regexp engine.
<chomp /> 
> [1] depending, of course, on your standards for code legibility ;)

Something like:

my $config = "/etc/perl-passwd.conf";     # Or whatever
my $options = {}; 			  # Not a hash, a reference to a hash
open CONFIG, $config or die "Cannot open $config: $!";
while (<CONFIG>) {
	next if /^(#.*)?$/;  		  # skip comments, blanks
	if (/^\s*(\w+)\s*=\s*(.+)\s*/) {  # Match "blah = foo bar"
		$options->{$1} = $2 	  # Set out reference to hash
	} else {
		warn "Error: $_";	  # Complain otherwise...
close CONFIG;				  # Move along, nothing to see here...
					  # Now use $options for your config
					  # but do more sanity checking on the 
					  # values of each key!

... and if you don't want the sanity check on the key = value, just use 
"$options->{$1} = $2 if (/^\s*(\w+)\s*=\s*(.+)\s*/);" at line 6.

Then you get to do things like setting options (keys) to arrays of values, 
having user config files override system ones and/or vice-versa, and other fun 
games; left as an exercise to the reader...


BTW, for those who have the Camel 5 book edition 2: make sure you take a 
peek at the edition 3; its about double the pages, lots of cool stuff...
 James Bromberger <james_AT_rcpt.to> www.james.rcpt.to
 Australian Debian Conference: http://www.linux.org.au/conf/debiancon.html
 Remainder moved to http://www.james.rcpt.to/james/sig.html

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