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#!/bin/sh
# mcolor - colorize rendered mail

# restart as awk script
true + /; exec awk -f "$0"; exit; / {}

function co(n, c) { e = ENVIRON["MCOLOR_" n]; return e ? e : c }
function fg(c, s) { return sprintf("\033[38;5;%03dm%s\033[0m", c, s) }
function so(s) { return sprintf("\033[1m%s\033[0m", s) }
BEGIN { hdr = 1 }
/^$/ { hdr = 0 }
/^-- $/ { ftr = 1 }
/^--- .* ---/ { print fg(co("SEP",242), $0); ftr = 0; sig = 0; next }
/^-----BEGIN .* SIGNATURE-----/ { sig = 1 }
hdr && /^From:/ { print so(fg(co("FROM",119), $0)); next }
hdr { print fg(co("HEADER",120), $0); next }
ftr { print fg(co("FOOTER",244), $0); next }
/^-----BEGIN .* MESSAGE-----/ ||
/^-----END .* SIGNATURE-----/ { print fg(co("SIG",244), $0); sig = 0; next }
sig { print fg(co("SIG",244), $0); next }
/^>/ { print fg(co("QUOTE",151), $0); next }
{ print }