Add "getenv" as an wrapper for os.Getenv

Add a wrapper for the os.Getenv function. The
wrapper takes as input a string that is assumed to be an exported
variable name.

Fixes #977

diff --git a/tpl/template.go b/tpl/template.go
index 9322dc0092203d7708467bce14fbd7dcf9e3e045..499e831862cf89da617c24153e7b2b097e03e3c6 100644 (file)
--- a/tpl/template.go
+++ b/tpl/template.go
@@ -1341,6 +1341,7 @@ func init() {
                "getCSV":      GetCSV,
                "getCsv":      GetCSV,
                "seq":         helpers.Seq,
+               "getenv":      func(varName string) string { return os.Getenv(varName) },
        }
 
 }