diff --git a/tmpl/tmpl.go b/tmpl/tmpl.go
index 6021136..0beb07c 100644
--- a/tmpl/tmpl.go
+++ b/tmpl/tmpl.go
@@ -1,15 +1,16 @@
 package tmpl
 
 import (
-	"os"
-	"fmt"
 	"bufio"
+	"fmt"
 	"io"
+	"os"
+
 	"surdeus.su/core/cli/mtool"
 )
 
 var (
-	delim rune
+	delim = '\n'
 	Tool = mtool.T("tmpl").Func(Run).Desc(
 		"substitute the inputted runes with the specified words",
 	).Usage(
@@ -17,17 +18,24 @@ var (
 	)
 )
 
+func Run(flags *mtool.Flags){
+	CustomRun(os.Stdin, os.Stdout, flags)
+}
 
-func Run(flags *mtool.Flags) {
+func CustomRun(
+	input io.Reader,
+	output io.Writer,
+	flags *mtool.Flags,
+) {
 
 	var (
-		chrsString string 
+		charsString string
 		chrs []rune
 		skip bool
 	)
 
 	flags.StringVar(
-		&chrsString,
+		&charsString,
 		"c",
 		"0123456789",
 		"character set for substitution",
@@ -40,16 +48,15 @@ func Run(flags *mtool.Flags) {
 		false,
 		"skip and do not substitute not fitting chars",
 	)
-	
-	delim = '\n'
+
 	args := flags.Parse()
-	
+
 	/*if len(args)<2 || len(args[0]) != len(args)-1 {
 		flags.Usage()
 		os.Exit(1)
 	}*/
 
-	chrs = []rune(chrsString)
+	chrs = []rune(charsString)
 	//args = args[1:]
 
 	tmpl := make(map[rune] string)
@@ -57,7 +64,7 @@ func Run(flags *mtool.Flags) {
 		tmpl[rune(chrs[i])] = s
 	}
 
-	r := bufio.NewReader(os.Stdin)
+	r := bufio.NewReader(input)
 	for{
 		s, e := r.ReadString(byte(delim))
 		if e==io.EOF {
@@ -71,6 +78,6 @@ func Run(flags *mtool.Flags) {
 			}
 			fmt.Printf("%s", s)
 		}
-		fmt.Printf("%s", string(delim))
+		fmt.Fprintf(output, "%s", string(delim))
 	}
 }