Per the fashion police

README.md

@@ -102,7 +102,7 @@ Template transformation uses [Go templates](https://golang.org/pkg/text/template
 
 There are the following extra functions available in templates: url_host, url_user, url_password, url_path, url_scheme and trim_prefix. The current list of the custom functions can be found here https://github.com/springload/ssm-parent/blob/master/ssm/transformations/template_funcs.go#L9
 
-trim_name_prefix will match any variables starting with `startswith` and will remove the `trim` string from the start of the corresponding variable names.
+trim_name_prefix will match any variables starting with `starts_with` and will remove the `trim` string from the start of the corresponding variable names.
 
 There is practically no limit on the number of transformations and they are applied in order from top to the bottom.
 
@@ -131,7 +131,7 @@ transformations:
     - action: trim_name_prefix
       rule:
           trim: "_"
-          startswith: "_PHP"
+          starts_with: "_PHP"
 ```
 
 ### Example Dockerfile part

ssm/transformations/actions.go

@@ -80,10 +80,10 @@ func (t *TrimTransformation) Transform(source map[string]string) (map[string]str
 	if _, found := t.Rule["trim"]; !found {
 		return source, fmt.Errorf("\"trim\" rule not set")
 	}
-	if _, found := t.Rule["startswith"]; !found {
-		return source, fmt.Errorf("\"startswith\" rule not set")
+	if _, found := t.Rule["starts_with"]; !found {
+		return source, fmt.Errorf("\"starts_with\" rule not set")
 	}
-	TrimKeys(source, t.Rule["trim"], t.Rule["startswith"])
+	TrimKeys(source, t.Rule["trim"], t.Rule["starts_with"])
 
 	return source, nil
 }

ssm/transformations/trim.go

@@ -4,10 +4,10 @@ import (
 	"strings"
 )
 
-func TrimKeys(parameters map[string]string, trim string, startswith string) error {
+func TrimKeys(parameters map[string]string, trim string, startsWith string) error {
 
 	for key, value := range parameters {
-		if strings.HasPrefix(key, startswith) {
+		if strings.HasPrefix(key, startsWith) {
 			parameters[strings.TrimPrefix(key, trim)] = value
 			delete(parameters, key)
 		}

ssm/transformations/trim_test.go

@@ -27,9 +27,9 @@ func TestTrimKeys(t *testing.T) {
 		result[value] = key
 	}
 
-	for val, expected_param := range expecting {
-		if result[val] != expected_param {
-			t.Errorf("'%s's key should be '%s', but got '%s'", val, expected_param, result[val])
+	for val, expectedParam := range expecting {
+		if result[val] != expectedParam {
+			t.Errorf("'%s's key should be '%s', but got '%s'", val, expectedParam, result[val])
 		}
 	}
 }