Add ExeExt template function

Author: andreynering

README.md

@@ -309,6 +309,8 @@ Task also adds the following functions:
   path format to `/`.
 - `FromSlash`: Oposite of `ToSlash`. Does nothing on Unix, but on Windows
   converts a string from `\` path format to `/`.
+- `ExeExt`: Returns the right executable extension for the current OS
+  (`".exe"` for Windows, `""` for others).
 
 Example:
 

variable_handling.go

@@ -91,6 +91,12 @@ func init() {
 		"ToSlash": func(path string) string {
 			return filepath.ToSlash(path)
 		},
+		"ExeExt": func() string {
+			if runtime.GOOS == "windows" {
+				return ".exe"
+			}
+			return ""
+		},
 	}
 
 	templateFuncs = sprig.TxtFuncMap()