Added Indian conversion (and subcontinent) for currencies (#155)

* Indian currency conversion (also for the subcontinent)

* updated readme

* Unwanted log commented out

* Fixes to comments and added info about indian language

Author: chilarai

README.md

@@ -14,15 +14,14 @@
 
 ## Supported languages
 
-
-
 | Code            | Flag | Language                         | Main Region | 42               |
 | --------------- | ---- | -------------------------------- | ----------- | ---------------- |
 | `en`, `en-us`   | 🇺🇸   | American English                 | USA         | forty-two        |
 | `fr`, `fr-fr`   | 🇫🇷   | French, Français                 | France      | quarante-deux    |
 | `it`, `it-it`   | 🇮🇹   | Italiano                         | Italy       | quarantadue      |
+| `in`, `en-in`   | 🇮🇳   | Indian English                   | India       | forty-two        |
 | `es`, `es-es`   | 🇪🇸   | European Spanish                 | Spain       | cuarenta y dos   |
-| `dk`, `da-dk`   | 🇩🇰   | Danish                          | Denmark      | toogfyrre       |
+| `dk`, `da-dk`   | 🇩🇰   | Danish                           | Denmark     | toogfyrre        |
 | `se`, `sv-se`   | 🇸🇪   | Swedish                          | Sweden      | fyrtio-två       |
 | `nl`, `nl-nl`   | 🇳🇱   | Dutch                            | Netherlands | tweeenveertig    |
 | `tr`, `tr-tr`   | 🇹🇷   | Turkish                          | Turkey      | kırk iki         |
@@ -50,6 +49,9 @@ nonante-deux
 $ number-to-words --lang=it 42
 quarantadue
 
+$ number-to-words --lang=in 42
+forty-two
+
 $ number-to-words --lang=es 42
 cuarenta y dos
 
@@ -149,6 +151,7 @@ MCCCXXXVII
 seribu tiga ratus tiga puluh tujuh
 
 $ number-to-words --lang=all 1234567890
+one arab twenty-three crore forty-five lakh sixty-seven thousand eight hundred ninety
 one billion two hundred thirty-four million five hundred sixty-seven thousand eight hundred ninety
 un milliard deux cent trente-quatre millions cinq cent soixante-sept mille huit cent quatre-vingt-dix
 un milliard deux cent trente-quatre millions cinq cent soixante-sept mille huit cent nonante
@@ -204,6 +207,7 @@ AVAILABLE LANGUAGES:
    Belgian French (fr-be, fr_BE, belgian) 🇧🇪
    French (fr, fr-fr, fr_FR, french) 🇫🇷
    Italian (it, it-it, it_IT, italian) 🇮🇹
+   Indian English (in, en-in, indian) 🇮🇳
    Roman Numbers (with Unicode) (roman-unicode)
    Danish (da-dk, da_DK, danish) 🇩🇰
    Swedish (sv-se, sv_SE, swedish) 🇸🇪

en-in.go

@@ -0,0 +1,94 @@
+package ntw
+
+import (
+	"fmt"
+	"strings"
+)
+
+func init() {
+	// register the language
+	Languages["en-in"] = Language{
+		Name:    "Indian English",
+		Aliases: []string{"en", "en-in", "indian", "english"},
+		Flag:    "🇮🇳",
+
+		IntegerToWords: IntegerToEnIn,
+	}
+}
+
+// IntegerToEnIn converts an integer to Indian English words
+func IntegerToEnIn(input int) string {
+	var indianMegas = []string{"", "thousand", "lakh", "crore", "arab", "kharab", "neel", "padma", "shankh", "mahashankh"}
+	var indianUnits = []string{"", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"}
+	var indianTens = []string{"", "ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"}
+	var indianTeens = []string{"ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"}
+
+	//log.Printf("Input: %d\n", input)
+	words := []string{}
+
+	if input < 0 {
+		words = append(words, "minus")
+		input *= -1
+	}
+
+	// split integer in hybrids
+	var hybrids []int
+	hybrids = integerToDHybrid(input)
+
+	
+	// log.Printf("Hybrids: %v\n", hybrids)
+
+	// zero is a special case
+	if len(hybrids) == 0 {
+		return "zero"
+	}
+
+	// iterate over hybrids
+	for idx := len(hybrids) - 1; idx >= 0; idx-- {
+		hybrid := hybrids[idx]
+		//log.Printf("hybrid: %d (idx=%d)\n", hybrid, idx)
+
+		// nothing todo for empty hybrid
+		if hybrid == 0 {
+			continue
+		}
+
+		// three-digits
+		hundreds := hybrid / 100 % 10
+		tens := hybrid / 10 % 10
+		units := hybrid % 10
+		//log.Printf("Hundreds:%d, Tens:%d, Units:%d\n", hundreds, tens, units)
+		if hundreds > 0 {
+			words = append(words, indianUnits[hundreds], "hundred")
+		}
+
+		if tens == 0 && units == 0 {
+			goto hybridEnd
+		}
+
+		switch tens {
+		case 0:
+			words = append(words, indianUnits[units])
+		case 1:
+			words = append(words, indianTeens[units])
+			break
+		default:
+			if units > 0 {
+				word := fmt.Sprintf("%s-%s", indianTens[tens], indianUnits[units])
+				words = append(words, word)
+			} else {
+				words = append(words, indianTens[tens])
+			}
+			break
+		}
+
+		hybridEnd:
+		// mega
+		if mega := indianMegas[idx]; mega != "" {
+			words = append(words, mega)
+		}
+	}
+
+	//log.Printf("Words length: %d\n", len(words))
+	return strings.Join(words, " ")
+}

utils.go

@@ -10,3 +10,22 @@ func integerToTriplets(number int) []int {
 
 	return triplets
 }
+
+func integerToDHybrid(number int) []int {
+	hybrid := []int{}
+
+	startHybrid := false
+	for number > 0 {
+		if !startHybrid{
+			hybrid = append(hybrid, number%1000)
+			number = number / 1000
+			startHybrid = true
+		} else {
+			hybrid = append(hybrid, number%100)
+			number = number / 100
+		}
+		
+	}
+
+	return hybrid
+}