Add option for ignoring values

Ignoring is set up using `# -- @ignored` tag

README.md

@@ -321,6 +321,14 @@ The order is important. The first comment line(s) must be the one specifying the
 the description for the field. The `@default` comment must follow.
 
 See [here](./example-charts/custom-template/values.yaml) for an example.
+### Ignoring values
+In cases you would like to ignore certain values, you can mark it as ignored:
+
+```yaml
+# -- @ignored
+service:
+  port: 8080
+```
 
 ### Spaces and Dots in keys
 In the old-style comment, if a key name contains any "." or " " characters, that section of the path must be quoted in

example-charts/ignored-values-example/Chart.yaml

@@ -0,0 +1,11 @@
+apiVersion: v2
+name: ignored-values-example
+description: Based on best-values-example
+version: "0.1.0"
+home: "https://github.com/norwoodj/helm-docs/tree/master/example-charts/ignored-values-example"
+sources: ["https://github.com/norwoodj/helm-docs/tree/master/example-charts/ignored-values-example"]
+engine: gotpl
+type: application
+maintainers:
+  - email: jakub.buczak@gmail.com
+    name: Jakub Buczak

example-charts/ignored-values-example/README.md

@@ -0,0 +1,35 @@
+# ignored-values-example
+
+![Version: 0.1.0](https://img.shields.io/badge/Version-0.1.0-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square)
+
+Based on best-values-example
+
+**Homepage:** <https://github.com/norwoodj/helm-docs/tree/master/example-charts/ignored-values-example>
+
+## Maintainers
+
+| Name | Email | Url |
+| ---- | ------ | --- |
+| Jakub Buczak | <jakub.buczak@gmail.com> |  |
+
+## Source Code
+
+* <https://github.com/norwoodj/helm-docs/tree/master/example-charts/ignored-values-example>
+
+## Values
+
+| Key | Type | Default | Description |
+|-----|------|---------|-------------|
+| config.databasesToCreate[0] | string | `"postgresql"` | default database for storage of database metadata |
+| config.databasesToCreate[1] | string | `"hashbash"` | database for the [hashbash](https://github.com/norwoodj/hashbash) project |
+| config.usersToCreate[0] | object | `{"admin":true,"name":"root"}` | admin user |
+| config.usersToCreate[1] | object | `{"name":"hashbash","readwriteDatabases":["hashbash"]}` | user with access to the database with the same name |
+| configWithAllValuesIgnored | object | `{}` |  |
+| statefulset.extraVolumes | list | `[{"emptyDir":{},"name":"data"}]` | Additional volumes to be mounted into the database container |
+| statefulset.image.repository | string | `"jnorwood/postgresq"` | Image to use for deploying, must support an entrypoint which creates users/databases from appropriate config files |
+| statefulset.image.tag | string | `"11"` |  |
+| statefulset.livenessProbe | object | `{"enabled":false}` | Configure the healthcheck for the database |
+| statefulset.podLabels | object | `{}` | The labels to be applied to instances of the database |
+
+----------------------------------------------
+Autogenerated from chart metadata using [helm-docs v1.9.1](https://github.com/norwoodj/helm-docs/releases/v1.9.1)

example-charts/ignored-values-example/values.yaml

@@ -0,0 +1,51 @@
+statefulset:
+  image:
+    # -- Image to use for deploying, must support an entrypoint
+    # which creates users/databases from appropriate config files
+    repository: jnorwood/postgresq
+    tag: "11"
+
+  # -- Additional volumes to be mounted into the database container
+  extraVolumes:
+    - name: data
+      emptyDir: {}
+
+  # -- Configure the healthcheck for the database
+  livenessProbe:
+    enabled: false
+
+  # -- The labels to be applied to instances of the database
+  podLabels: {}
+
+config:
+  databasesToCreate:
+    # -- default database for storage of database metadata
+    - postgresql
+
+    # -- database for the [hashbash](https://github.com/norwoodj/hashbash) project
+    - hashbash
+
+  usersToCreate:
+    # -- admin user
+    - {name: root, admin: true}
+
+    # -- user with access to the database with the same name
+    - {name: hashbash, readwriteDatabases: [hashbash]}
+
+    # -- @ignore test
+    - {name: test, readDatabases: [test]}
+
+# -- @ignore
+internalConfig:
+  rpcPort: 8080
+  # -- this should also be ignored
+  generateData: true
+
+# -- @ignore
+ignoredConfig: 5
+
+configWithAllValuesIgnored:
+  # -- @ignore
+  ignoredOne: true
+  # -- @ignore
+  ignoredTwo: "?"

pkg/helm/chart_info.go

@@ -146,6 +146,25 @@ func parseChartRequirementsFile(chartDirectory string, apiVersion string) (Chart
 	return chartRequirements, nil
 }
 
+func removeIgnored(rootNode *yaml.Node, rootKind yaml.Kind) {
+	var toDelete []int
+	for i, node := range rootNode.Content {
+		if strings.Contains(node.HeadComment, "# -- @ignore") {
+			toDelete = append(toDelete, i)
+			if rootKind == yaml.MappingNode {
+				toDelete = append(toDelete, i+1)
+			}
+		}
+	}
+	for i := len(toDelete) - 1; i >= 0; i-- {
+		var d int = toDelete[i]
+		rootNode.Content = append(rootNode.Content[:d], rootNode.Content[d+1:]...)
+	}
+	for _, node := range rootNode.Content {
+		removeIgnored(node, node.Kind)
+	}
+}
+
 func parseChartValuesFile(chartDirectory string) (yaml.Node, error) {
 	valuesPath := filepath.Join(chartDirectory, viper.GetString("values-file"))
 	yamlFileContents, err := getYamlFileContents(valuesPath)
@@ -156,6 +175,7 @@ func parseChartValuesFile(chartDirectory string) (yaml.Node, error) {
 	}
 
 	err = yaml.Unmarshal(yamlFileContents, &values)
+	removeIgnored(&values, values.Kind)
 	return values, err
 }