fix: Add support for empty output

Signed-off-by: Trevor Taubitz <[email protected]>

lang/README.md

@@ -29,6 +29,7 @@ Package lang provides constructs for defining golang language constructs and ext
   - [func NewExample(cfg *Config, name string, doc *doc.Example) *Example](<#func-newexample>)
   - [func (ex *Example) Code() (string, error)](<#func-example-code>)
   - [func (ex *Example) Doc() *Doc](<#func-example-doc>)
+  - [func (ex *Example) HasOutput() bool](<#func-example-hasoutput>)
   - [func (ex *Example) Level() int](<#func-example-level>)
   - [func (ex *Example) Location() Location](<#func-example-location>)
   - [func (ex *Example) Name() string](<#func-example-name>)
@@ -272,6 +273,14 @@ func (ex *Example) Doc() *Doc
 
 Doc provides the structured contents of the documentation comment for the example\.
 
+### func \(\*Example\) [HasOutput](<https://github.com/princjef/gomarkdoc/blob/master/lang/example.go#L87>)
+
+```go
+func (ex *Example) HasOutput() bool
+```
+
+HasOutput indicates whether the example contains any example output\.
+
 ### func \(\*Example\) [Level](<https://github.com/princjef/gomarkdoc/blob/master/lang/example.go#L25>)
 
 ```go

lang/example.go

@@ -82,3 +82,8 @@ func (ex *Example) Code() (string, error) {
 func (ex *Example) Output() string {
 	return ex.doc.Output
 }
+
+// HasOutput indicates whether the example contains any example output.
+func (ex *Example) HasOutput() bool {
+	return ex.doc.Output != "" && !ex.doc.EmptyOutput
+}

templates/example.gotxt

@@ -4,9 +4,13 @@
 
 {{- codeBlock "go" .Code }}
 
-Output:
+{{- if .HasOutput -}}
 
-{{ codeBlock "" .Output -}}
+	{{- header 4 "Output" -}}
+
+	{{- codeBlock "" .Output -}}
+
+{{- end -}}
 
 {{- accordionTerminator -}}