Multiline editing instead of painful sed or awk

rough_sed.rb

# encoding: utf-8

# Usage:
#   SRC_FILE="nginx.conf" DIST_FILE="nginx.conf~" ruby rough_sed.rb

from =<<EOS
    log_format main      '$remote_addr - $remote_user [$time_local]  '
      '"$request" $status $bytes_sent '
      '"$http_referer" "$http_user_agent" '
      '"$gzip_ratio"';
EOS

to =<<EOS
    log_format   main '$remote_addr - $remote_user [$time_local]  $status '
       '"$request" $body_bytes_sent "$http_referer" '
       '"$http_user_agent" "$http_x_forwarded_for"';
EOS

string = File.read(ENV["SRC_FILE"], encoding: Encoding::UTF_8)
result = string.sub(from, to)

File.write(ENV["DIST_FILE"], result)

exit 0