#!/usr/bin/perl

# Author: Josh Holtrop
# Purpose: edit a file encrypted by gpg
# Set environment variable GPGEDIT_RECIPIENT to specify the recipient

use strict;
use warnings;

sub usage
{
    print STDERR "Usage: $0 <file>\n";
    exit(42);
}

usage() unless ($#ARGV >= 0);
my $fname = shift(@ARGV);
my $dfname = $fname;
$dfname =~ s/\.gpg$//i;

my $result = system('gpg', '--decrypt', '--output', $dfname, $fname);
if ($result != 0)
{
    print STDERR "Error decrypting: exiting.\n";
    exit(1);
}

my $editor = $ENV{'EDITOR'};
$editor = 'vim' if ($editor =~ /^\s*$/);

system($editor, $dfname);

my $recipient = '';
if (exists($ENV{'GPGEDIT_RECIPIENT'}))
{
    $recipient = $ENV{'GPGEDIT_RECIPIENT'};
}
my @cmd = ('gpg', '--encrypt');
if ($recipient !~ /^\s*$/)
{
    push(@cmd, '--recipient', $recipient);
}
push(@cmd, $dfname);

system('mv', $fname, "$fname~");
system(@cmd);
unlink($dfname);