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

---
 dsb/dsb.go | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)

(limited to 'dsb/dsb.go')

diff --git a/dsb/dsb.go b/dsb/dsb.go
index 4cfca75e..a6323c88 100644
--- a/dsb/dsb.go
+++ b/dsb/dsb.go
@@ -231,3 +231,75 @@ func (dsb *dsb) FmtCurrency(num float64, v uint64, currency currency.Type) []byt
 
 	return b
 }
+
+// FmtAccounting returns the currency representation of 'num' with digits/precision of 'v' for 'dsb'
+// 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 (dsb *dsb) FmtAccounting(num float64, v uint64, currency currency.Type) []byte {
+
+	s := strconv.FormatFloat(math.Abs(num), 'f', int(v), 64)
+	symbol := dsb.currencies[currency]
+	l := len(s) + len(dsb.decimal) + len(dsb.group)*len(s[:len(s)-int(v)-1])/3
+	count := 0
+	inWhole := v == 0
+	b := make([]byte, 0, l)
+
+	for i := len(s) - 1; i >= 0; i-- {
+
+		if s[i] == '.' {
+			b = append(b, dsb.decimal[0])
+			inWhole = true
+
+			continue
+		}
+
+		if inWhole {
+			if count == 3 {
+				b = append(b, dsb.group[0])
+				count = 1
+			} else {
+				count++
+			}
+		}
+
+		b = append(b, s[i])
+	}
+
+	if num < 0 {
+
+		b = append(b, dsb.minus[0])
+
+	}
+
+	// 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 int(v) < 2 {
+
+		if v == 0 {
+			b = append(b, dsb.decimal...)
+		}
+
+		for i := 0; i < 2-int(v); i++ {
+			b = append(b, '0')
+		}
+	}
+
+	if num < 0 {
+
+		b = append(b, dsb.currencyNegativeSuffix...)
+
+		b = append(b, symbol...)
+
+	} else {
+
+		b = append(b, dsb.currencyPositiveSuffix...)
+
+		b = append(b, symbol...)
+
+	}
+
+	return b
+}
-- 
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