Merge pull request #7 from ieee0824/int

int系の型のparserを増やす

int.go

@@ -3,6 +3,7 @@ package getenv
 import (
 	"os"
 	"strconv"
+	"log"
 )
 
 func Int(key string, def ...int) int {
@@ -20,3 +21,54 @@ func Int(key string, def ...int) int {
 	}
 	return i
 }
+
+func Int32(key string, def ...int32) (int32) {
+	var d int32
+	if len(def) != 0 {
+		d = def[0]
+	}
+	v := os.Getenv(key)
+	if v == "" {
+		return d
+	}
+	i32, err := strconv.ParseInt(v, 10, 32)
+	if err != nil {
+		log.Printf("parse error: input: %v, %v\n", v, err.Error())
+		return d
+	}
+	return int32(i32)
+}
+
+func Int64(key string, def ...int64) (int64) {
+	var d int64
+	if len(def) != 0 {
+		d = def[0]
+	}
+	v := os.Getenv(key)
+	if v == "" {
+		return d
+	}
+	i64, err := strconv.ParseInt(v, 10, 64)
+	if err != nil {
+		log.Printf("parse error: input: %v, %v\n", v, err.Error())
+		return d
+	}
+	return int64(i64)
+}
+
+func Int16(key string, def ...int16) (int16) {
+	var d int16
+	if len(def) != 0 {
+		d = def[0]
+	}
+	v := os.Getenv(key)
+	if v == "" {
+		return d
+	}
+	i16, err := strconv.ParseInt(v, 10, 16)
+	if err != nil {
+		log.Printf("parse error: input: %v, %v\n", v, err.Error())
+		return d
+	}
+	return int16(i16)
+}