Make postgrey/spamassassin whitelist

makewhitelist.d

#!/usr/bin/dmd
import std.stdio;
import std.string;
import std.process;
import std.algorithm;
import std.array:array;
import std.typecons:Tuple;
import std.file:exists;

enum whitelists=[	"/etc/mail/spamassassin/sent_whitelist.txt",
			"/etc/mail/spamassassin/vcard_whitelist.txt"
		];
enum postgreyWhitelistPath="/etc/postfix/postgrey_whitelist_clients.local";

int main(string[] args)
{
	bool all=(args.length==2 && args[1]=="--all");
	string result;
	foreach(file;whitelists)
	{	
		result~=(cast(string)std.file.read(file))
			.splitLines
			.map!(a=>a.extractDomain)
			.array
			.sort
			.uniq
			.filter!(a=>(a.length>0))
			.join("\n");
	}
		
	std.file.write(postgreyWhitelistPath,result);
	return 0;
}

string extractDomain(string entry)
{
	auto i=entry.indexOf("@");
	if ((i==-1)||(i==entry.length-1))
		return "";
	return entry[i+1..$].strip;
}