Added trim functions

docs/templating-language.md

@@ -57,6 +57,9 @@ provides the following functions:
   - [mergeMap](#mergemap)
   - [mergeMapWithOverride](#mergemapwithoverride)
   - [trimSpace](#trimspace)
+  - [trim](#trim)
+  - [trimPrefix](#trimprefix)
+  - [trimSuffix](#trimsuffix)  
   - [parseBool](#parsebool)
   - [parseFloat](#parsefloat)
   - [parseInt](#parseint)
@@ -1256,6 +1259,30 @@ Takes the provided input and trims all whitespace, tabs and newlines:
 {{ file "/etc/ec2_version" | trimSpace }}
 ```
 
+### `trim`
+
+Takes the provided input and trims all leading and trailing unicode:
+
+```golang
+{{ "hello world!!" | trim "!!" }}
+```
+
+### `trimPrefix`
+
+Takes the provided input and trims leading prefix string:
+
+```golang
+{{ "hello world!!" | trimPrefix "hello" }}
+```
+
+### `trimSuffix`
+
+Takes the provided input and trims trailing suffix string:
+
+```golang
+{{ "hello world!!" | trimSuffix "world!!" }}
+```
+
 ### `parseBool`
 
 Takes the given string and parses it as a boolean:

template/funcs.go

@@ -950,6 +950,21 @@ func join(sep string, a []string) (string, error) {
 	return strings.Join(a, sep), nil
 }
 
+// trim is a version of strings.Trim that can be piped
+func trim(cutset string, s string) (string, error) {
+	return strings.Trim(s, cutset), nil
+}
+
+// trimPrefix is a version of strings.TrimPrefix that can be piped
+func trimPrefix(prefix string, s string) (string, error) {
+	return strings.TrimPrefix(s, prefix), nil
+}
+
+// trimSuffix is a version of strings.TrimSuffix that can be piped
+func trimSuffix(suffix string, s string) (string, error) {
+	return strings.TrimSuffix(s, suffix), nil
+}
+
 // TrimSpace is a version of strings.TrimSpace that can be piped
 func trimSpace(s string) (string, error) {
 	return strings.TrimSpace(s), nil

template/template.go

@@ -284,6 +284,9 @@ func funcMap(i *funcMapInput) template.FuncMap {
 		"indent":                indent,
 		"loop":                  loop,
 		"join":                  join,
+		"trim":                  trim,
+		"trimPrefix":            trimPrefix,
+		"trimSuffix":            trimSuffix,
 		"trimSpace":             trimSpace,
 		"parseBool":             parseBool,
 		"parseFloat":            parseFloat,

template/template_test.go

@@ -1455,6 +1455,39 @@ func TestTemplate_Execute(t *testing.T) {
 			"a;b;c",
 			false,
 		},
+		{
+			"helper_trim",
+			&NewTemplateInput{
+				Contents: `{{ "!!hello world!!" | trim "!!" }}`,
+			},
+			&ExecuteInput{
+				Brain: NewBrain(),
+			},
+			"hello world",
+			false,
+		},
+		{
+			"helper_trimPrefix",
+			&NewTemplateInput{
+				Contents: `{{ "hello world!!" | trimPrefix "hello " }}`,
+			},
+			&ExecuteInput{
+				Brain: NewBrain(),
+			},
+			"world!!",
+			false,
+		},
+		{
+			"helper_trimSuffix",
+			&NewTemplateInput{
+				Contents: `{{ "hello world!!" | trimSuffix " world!!" }}`,
+			},
+			&ExecuteInput{
+				Brain: NewBrain(),
+			},
+			"hello",
+			false,
+		},
 		{
 			"helper_parseBool",
 			&NewTemplateInput{
@@ -1993,7 +2026,7 @@ func Test_writeToFile(t *testing.T) {
 
 	cases := []struct {
 		name        string
-		filePath   string
+		filePath    string
 		content     string
 		username    string
 		groupName   string