From aaa28727a7fc0cc7add5d60b31abfe62b983bedd Mon Sep 17 00:00:00 2001
From: joeybloggs <Dean.Karn@gmail.com>
Date: Mon, 15 Aug 2016 21:59:49 -0400
Subject: add accounting currency formatting logic + function

---
 eo/eo.go | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

(limited to 'eo/eo.go')

diff --git a/eo/eo.go b/eo/eo.go
index 2ab51a06..fea53eb0 100644
--- a/eo/eo.go
+++ b/eo/eo.go
@@ -215,3 +215,68 @@ func (eo *eo) FmtCurrency(num float64, v uint64, currency currency.Type) []byte
 
 	return b
 }
+
+// FmtAccounting returns the currency representation of 'num' with digits/precision of 'v' for 'eo'
+// in accounting notation. returned as a []byte just in case the caller wishes to add more and can help
+// avoid allocations; otherwise just cast as string.
+func (eo *eo) FmtAccounting(num float64, v uint64, currency currency.Type) []byte {
+
+	s := strconv.FormatFloat(math.Abs(num), 'f', int(v), 64)
+	symbol := eo.currencies[currency]
+	l := len(s) + len(eo.decimal)
+
+	b := make([]byte, 0, l)
+
+	for i := len(s) - 1; i >= 0; i-- {
+
+		if s[i] == '.' {
+			b = append(b, eo.decimal[0])
+			continue
+		}
+
+		b = append(b, s[i])
+	}
+
+	if num < 0 {
+
+		for j := len(symbol) - 1; j >= 0; j-- {
+			b = append(b, symbol[j])
+		}
+
+		for j := len(eo.currencyNegativePrefix) - 1; j >= 0; j-- {
+			b = append(b, eo.currencyNegativePrefix[j])
+		}
+
+		for j := len(eo.minus) - 1; j >= 0; j-- {
+			b = append(b, eo.minus[j])
+		}
+
+	} else {
+
+		for j := len(symbol) - 1; j >= 0; j-- {
+			b = append(b, symbol[j])
+		}
+
+		for j := len(eo.currencyPositivePrefix) - 1; j >= 0; j-- {
+			b = append(b, eo.currencyPositivePrefix[j])
+		}
+
+	}
+
+	// reverse
+	for i, j := 0, len(b)-1; i < j; i, j = i+1, j-1 {
+		b[i], b[j] = b[j], b[i]
+	}
+
+	if num < 0 {
+
+		b = append(b, eo.currencyNegativeSuffix...)
+
+	} else {
+
+		b = append(b, eo.currencyPositiveSuffix...)
+
+	}
+
+	return b
+}
-- 
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