From 53234b91e0e5f4317fc54dee6a446ac1867683ff Mon Sep 17 00:00:00 2001
From: Andrey Nering <andrey.nering@gmail.com>
Date: Wed, 8 Mar 2017 20:13:52 -0300
Subject: [PATCH] Prevent running command more than once

---
 variable_handling.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/variable_handling.go b/variable_handling.go
index 8321fb1d..484c68f2 100644
--- a/variable_handling.go
+++ b/variable_handling.go
@@ -22,10 +22,15 @@ var (
 	ErrMultilineResultCmd = errors.New("Got multiline result from command")
 )
 
+var varCmds = make(map[string]string)
+
 func handleDynamicVariableContent(value string) (string, error) {
 	if value == "" || value[0] != '$' {
 		return value, nil
 	}
+	if result, ok := varCmds[value]; ok {
+		return result, nil
+	}
 	var cmd *exec.Cmd
 	if ShExists {
 		cmd = exec.Command(ShPath, "-c", value[1:])
@@ -44,7 +49,9 @@ func handleDynamicVariableContent(value string) (string, error) {
 	if bytes.ContainsRune(b, '\n') {
 		return "", ErrMultilineResultCmd
 	}
-	return strings.TrimSpace(string(b)), nil
+	result := strings.TrimSpace(string(b))
+	varCmds[value] = result
+	return result, nil
 }
 
 func (t *Task) handleVariables() (map[string]string, error) {