From 52a5840f7cfdd4e28539fa7a9526dd471ea56429 Mon Sep 17 00:00:00 2001
From: "Bradley M. Kuhn" <bkuhn@ebb.org>
Date: Wed, 12 Oct 2011 17:26:19 -0400
Subject: [PATCH] First hack at a trial balance report for Ledger.

---
 trial-balance-report.plx | 103 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100755 trial-balance-report.plx

diff --git a/trial-balance-report.plx b/trial-balance-report.plx
new file mode 100755
index 0000000..2a2c174
--- /dev/null
+++ b/trial-balance-report.plx
@@ -0,0 +1,103 @@
+#!/usr/bin/perl
+# trail-balance-report.plx                                    -*- Perl -*-
+#
+#    Script to generate a Trial Balance report for a ledger.
+
+# Copyright (C) 2011, Bradley M. Kuhn
+#
+# This program gives you software freedom; you can copy, modify, convey,
+# and/or redistribute it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program in a file called 'GPLv3'.  If not, write to the:
+#    Free Software Foundation, Inc., 51 Franklin St, Fifth Floor
+#                                    Boston, MA 02110-1301, USA.
+
+my $LEDGER_CMD = "/usr/bin/ledger";
+
+my $ACCT_WIDTH = 70;
+
+sub ParseNumber($) {
+  $_[0] =~ s/,//g;
+  return Math::BigFloat->new($_[0]);
+}
+
+Math::BigFloat->precision(-2);
+my $ZERO =  Math::BigFloat->new("0.00");
+
+if (@ARGV == 0) {
+  print STDERR "usage: $0 <LEDGER_OPTIONS>\n";
+  exit 1;
+}
+
+my(@ledgerOptions) = ('--wide-register-format', "%-.${ACCT_WIDTH}A %22.108t\n",  '-w', '-s', @ARGV);
+
+
+open(LEDGER_NEGATIVE, "-|", $LEDGER_CMD, '-d', 'a<0', @ledgerOptions)
+  or die "Unable to run $LEDGER_CMD -d a<0 @ledgerOptions: $!";
+
+my %acct;
+while (my $negLine = <LEDGER_NEGATIVE>) {
+  chomp $negLine;
+
+  die "Unable to parse output line from negative_ledger command: $negLine"
+    unless $negLine =~ /^\s*([^\$]+)\s+\$\s*\-\s*([\d\.\,]+)/;
+  my($account, $amount) = ($1, $2);
+  $amount = ParseNumber($amount);
+  $account =~ s/^\s+//;    $account =~ s/\s+$//;
+
+  $acc{$account}{negative} = $amount;
+}
+close LEDGER_NEGATIVE;
+die "error($0): $! while running negative_ledger command line" unless ($? == 0);
+
+open(LEDGER_NEGATIVE, "-|", $LEDGER_CMD, '-d', 'a<0', @ledgerOptions)
+  or die "Unable to run $LEDGER_CMD -d a<0 @ledgerOptions: $!";
+
+
+# Lazy here: this is nearly identical to loop above
+
+open(LEDGER_POSITIVE, "-|", $LEDGER_CMD, '-d', 'a>0', @ledgerOptions)
+  or die "Unable to run $LEDGER_CMD -d a<0 @ledgerOptions: $!";
+while (my $negLine = <LEDGER_POSITIVE>) {
+  chomp $negLine;
+
+  die "Unable to parse output line from positive_ledger command: $negLine"
+    unless $negLine =~ /^\s*([^\$]+)\s+\$\s*\s*([\d\.\,]+)/;
+  my($account, $amount) = ($1, $2);
+  $amount = ParseNumber($amount);
+  $account =~ s/^\s+//;    $account =~ s/\s+$//;
+
+  $acct{$account}{positive} = $amount;
+}
+close LEDGER_POSITIVE;
+die "error($0): $! while running positive_ledger command line" unless ($? == 0);
+
+
+print sprintf("%${ACCT_WIDTH}s       %s       %s\n\n", "ACCOUNT", "DEBITS", "CREDITS");
+
+print "ACCOUNT       DEBITS       CREDITS\n\n";
+
+my($totNeg, $totPos) = ($ZERO, $ZERO);
+foreach my $account (keys %acct) {
+  foreach my $val (qw/positive negative/) {
+    $acct{$account}{$val} = $ZERO unless defined $acct{$account}{$val};
+  }
+  print sprintf("%${ACCT_WIDTH}s       \$%-.2d       \$%-2.d\n", $account, 
+                $acct{$account}{negative},                 $acct{$account}{postiive});
+
+}
+print sprintf("%${ACCT_WIDTH}s       \$%-.2d       \$%-2.d\n", TOTAL, $totNeg, $totPos);
+###############################################################################
+#
+# Local variables:
+# compile-command: "perl -c trial-balance-report.plx"
+# End:
+