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#! /usr/bin/awk -f
#
# ledger balance calculator
#
# usage:
# [colorize=false] [scale=N] //ledger/lib/balance LEDGER_FILE...
# [colorize=false] [scale=N] //ledger/lib/balance < LEDGER_FILE
#
# description:
# The ledger balance calculator computes the balance of each account it
# encounters in the provided ledger files.
#
# example:
# //ledger/lib/balance < //cholerab/ledger-spec.markdown
#
# see also:
# //cholerab/ledger-spec.markdown (ledger file format)
#
BEGIN {
colorize = ENVIRON["colorize"] == "" || ENVIRON["colorize"] == "true"
# TODO use bc for arbitrary precision arithmetic
scale = ENVIRON["scale"]
}
/^[[:space:]]*[0-9]+-[0-9][0-9]-[0-9][0-9]/{
tx($2, $3, $4, $5)
}
END {
display_accounts()
}
function tx (dst, src, amt, u) {
withdraw(src, amt, u)
deposit(dst, amt, u)
}
function deposit (name, amt, u) {
accounts[name][u] += amt
}
function withdraw (name, amt, u) {
accounts[name][u] -= amt
}
function display_accounts() {
max_name_len = 0
for (name in accounts) {
if (length(name) > max_name_len) {
max_name_len = length(name)
}
}
max_balance_len = 0
for (name in accounts) {
for (u in accounts[name]) {
n = length(int(accounts[name][u]))
if (n > max_balance_len) {
max_balance_len = n
}
}
}
if (scale > 0) {
max_balance_len += length(".") + scale
}
for (name in accounts) {
for (u in accounts[name]) {
balance = accounts[name][u]
if (balance == 0) {
continue
}
fmt = "NAME BALANCE UNIT\n"
if (colorize) {
sub("BALANCE", "[" (balance < 0 ? 31 : 32) "m&[m", fmt)
}
sub("NAME", "%-" max_name_len "s", fmt)
sub("BALANCE", "%" max_balance_len "." scale "f", fmt)
sub("UNIT", "%s", fmt)
printf fmt, name, balance, u
}
}
}
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