Add ability to include files

README.md

@@ -12,3 +12,5 @@
 `echo "{{ .foo }}" | korvike -v foo=bar => "bar"`
 - Read environment variables and replace them inside the template:  
 `export FOO=bar; echo '{{env "FOO"}}' | korvike => "bar"`
+- Read a file and place it inside the template:  
+`echo "Hello World" > hello; echo '{{file "hello"}}' | korvike => "Hello World"`

func_file.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"io/ioutil"
+	"os"
+)
+
+func init() {
+	registerFunction("file", func(name string, v ...string) string {
+		defaultValue := ""
+		if len(v) > 0 {
+			defaultValue = v[0]
+		}
+		if _, err := os.Stat(name); err == nil {
+			if rawValue, err := ioutil.ReadFile(name); err == nil {
+				return string(rawValue)
+			}
+		}
+		return defaultValue
+	})
+}