Add "tenant", "labels_as_tags", and "descriptors" (#132)

descriptors.tf

@@ -0,0 +1,28 @@
+# It would be nice to have a fixed array of arguments passed into
+# `format()` so all you need to provide is a format string, but
+# unfortunately, that does not work easily
+# due to https://github.com/hashicorp/terraform/issues/28558
+# which requires that the format string consume the last argument passed in.
+# We could hack around it by adding then removing a trailing arg, like
+#
+#   trimsuffix(format("${var.format_string}%[${length(local.labels)+1}]v", concat(local.labels, ["x"])...), "x")
+#
+# but that is kind of a hack, and overlooks the fact that local.labels
+# drops empty label elements, so the index of an element is not guaranteed.
+#
+#
+# So we require the user to specify the arguments as well as the format string.
+#
+
+# There is a lot of room for enhancement, but since this is a new feature
+# with only 2 use cases, we are going to keep it simple for now.
+
+locals {
+  descriptor_labels = { for k, v in var.descriptor_formats : k => [
+    for label in v.labels : local.id_context[label]
+  ] }
+  descriptors = { for k, v in var.descriptor_formats : k => (
+    format(v.format, local.descriptor_labels[k]...)
+    )
+  }
+}

docs/terraform.md

@@ -21,21 +21,24 @@ No resources.
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
-| <a name="input_additional_tag_map"></a> [additional\_tag\_map](#input\_additional\_tag\_map) | Additional tags for appending to tags\_as\_list\_of\_maps. Not added to `tags`. | `map(string)` | `{}` | no |
-| <a name="input_attributes"></a> [attributes](#input\_attributes) | Additional attributes (e.g. `1`) | `list(string)` | `[]` | no |
-| <a name="input_context"></a> [context](#input\_context) | Single object for setting entire context at once.<br>See description of individual variables for details.<br>Leave string and numeric variables as `null` to use default value.<br>Individual variable settings (non-null) override settings in context object,<br>except for attributes, tags, and additional\_tag\_map, which are merged. | `any` | <pre>{<br>  "additional_tag_map": {},<br>  "attributes": [],<br>  "delimiter": null,<br>  "enabled": true,<br>  "environment": null,<br>  "id_length_limit": null,<br>  "label_key_case": null,<br>  "label_order": [],<br>  "label_value_case": null,<br>  "name": null,<br>  "namespace": null,<br>  "regex_replace_chars": null,<br>  "stage": null,<br>  "tags": {}<br>}</pre> | no |
-| <a name="input_delimiter"></a> [delimiter](#input\_delimiter) | Delimiter to be used between `namespace`, `environment`, `stage`, `name` and `attributes`.<br>Defaults to `-` (hyphen). Set to `""` to use no delimiter at all. | `string` | `null` | no |
+| <a name="input_additional_tag_map"></a> [additional\_tag\_map](#input\_additional\_tag\_map) | Additional key-value pairs to add to each map in `tags_as_list_of_maps`. Not added to `tags` or `id`.<br>This is for some rare cases where resources want additional configuration of tags<br>and therefore take a list of maps with tag key, value, and additional configuration. | `map(string)` | `{}` | no |
+| <a name="input_attributes"></a> [attributes](#input\_attributes) | ID element. Additional attributes (e.g. `workers` or `cluster`) to add to `id`,<br>in the order they appear in the list. New attributes are appended to the<br>end of the list. The elements of the list are joined by the `delimiter`<br>and treated as a single ID element. | `list(string)` | `[]` | no |
+| <a name="input_context"></a> [context](#input\_context) | Single object for setting entire context at once.<br>See description of individual variables for details.<br>Leave string and numeric variables as `null` to use default value.<br>Individual variable settings (non-null) override settings in context object,<br>except for attributes, tags, and additional\_tag\_map, which are merged. | `any` | <pre>{<br>  "additional_tag_map": {},<br>  "attributes": [],<br>  "delimiter": null,<br>  "descriptor_formats": {},<br>  "enabled": true,<br>  "environment": null,<br>  "id_length_limit": null,<br>  "label_key_case": null,<br>  "label_order": [],<br>  "label_value_case": null,<br>  "labels_as_tags": [<br>    "unset"<br>  ],<br>  "name": null,<br>  "namespace": null,<br>  "regex_replace_chars": null,<br>  "stage": null,<br>  "tags": {},<br>  "tenant": null<br>}</pre> | no |
+| <a name="input_delimiter"></a> [delimiter](#input\_delimiter) | Delimiter to be used between ID elements.<br>Defaults to `-` (hyphen). Set to `""` to use no delimiter at all. | `string` | `null` | no |
+| <a name="input_descriptor_formats"></a> [descriptor\_formats](#input\_descriptor\_formats) | Describe additional descriptors to be output in the `descriptors` output map.<br>Map of maps. Keys are names of descriptors. Values are maps of the form<br>`{<br>   format = string<br>   labels = list(string)<br>}`<br>(Type is `any` so the map values can later be enhanced to provide additional options.)<br>`format` is a Terraform format string to be passed to the `format()` function.<br>`labels` is a list of labels, in order, to pass to `format()` function.<br>Label values will be normalized before being passed to `format()` so they will be<br>identical to how they appear in `id`.<br>Default is `{}` (`descriptors` output will be empty). | `any` | `{}` | no |
 | <a name="input_enabled"></a> [enabled](#input\_enabled) | Set to false to prevent the module from creating any resources | `bool` | `null` | no |
-| <a name="input_environment"></a> [environment](#input\_environment) | Environment, e.g. 'uw2', 'us-west-2', OR 'prod', 'staging', 'dev', 'UAT' | `string` | `null` | no |
-| <a name="input_id_length_limit"></a> [id\_length\_limit](#input\_id\_length\_limit) | Limit `id` to this many characters (minimum 6).<br>Set to `0` for unlimited length.<br>Set to `null` for default, which is `0`.<br>Does not affect `id_full`. | `number` | `null` | no |
-| <a name="input_label_key_case"></a> [label\_key\_case](#input\_label\_key\_case) | The letter case of label keys (`tag` names) (i.e. `name`, `namespace`, `environment`, `stage`, `attributes`) to use in `tags`.<br>Possible values: `lower`, `title`, `upper`.<br>Default value: `title`. | `string` | `null` | no |
-| <a name="input_label_order"></a> [label\_order](#input\_label\_order) | The naming order of the id output and Name tag.<br>Defaults to ["namespace", "environment", "stage", "name", "attributes"].<br>You can omit any of the 5 elements, but at least one must be present. | `list(string)` | `null` | no |
-| <a name="input_label_value_case"></a> [label\_value\_case](#input\_label\_value\_case) | The letter case of output label values (also used in `tags` and `id`).<br>Possible values: `lower`, `title`, `upper` and `none` (no transformation).<br>Default value: `lower`. | `string` | `null` | no |
-| <a name="input_name"></a> [name](#input\_name) | Solution name, e.g. 'app' or 'jenkins' | `string` | `null` | no |
-| <a name="input_namespace"></a> [namespace](#input\_namespace) | Namespace, which could be your organization name or abbreviation, e.g. 'eg' or 'cp' | `string` | `null` | no |
-| <a name="input_regex_replace_chars"></a> [regex\_replace\_chars](#input\_regex\_replace\_chars) | Regex to replace chars with empty string in `namespace`, `environment`, `stage` and `name`.<br>If not set, `"/[^a-zA-Z0-9-]/"` is used to remove all characters other than hyphens, letters and digits. | `string` | `null` | no |
-| <a name="input_stage"></a> [stage](#input\_stage) | Stage, e.g. 'prod', 'staging', 'dev', OR 'source', 'build', 'test', 'deploy', 'release' | `string` | `null` | no |
-| <a name="input_tags"></a> [tags](#input\_tags) | Additional tags (e.g. `map('BusinessUnit','XYZ')` | `map(string)` | `{}` | no |
+| <a name="input_environment"></a> [environment](#input\_environment) | ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' | `string` | `null` | no |
+| <a name="input_id_length_limit"></a> [id\_length\_limit](#input\_id\_length\_limit) | Limit `id` to this many characters (minimum 6).<br>Set to `0` for unlimited length.<br>Set to `null` for keep the existing setting, which defaults to `0`.<br>Does not affect `id_full`. | `number` | `null` | no |
+| <a name="input_label_key_case"></a> [label\_key\_case](#input\_label\_key\_case) | Controls the letter case of the `tags` keys (label names) for tags generated by this module.<br>Does not affect keys of tags passed in via the `tags` input.<br>Possible values: `lower`, `title`, `upper`.<br>Default value: `title`. | `string` | `null` | no |
+| <a name="input_label_order"></a> [label\_order](#input\_label\_order) | The order in which the labels (ID elements) appear in the `id`.<br>Defaults to ["namespace", "environment", "stage", "name", "attributes"].<br>You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present. | `list(string)` | `null` | no |
+| <a name="input_label_value_case"></a> [label\_value\_case](#input\_label\_value\_case) | Controls the letter case of ID elements (labels) as included in `id`,<br>set as tag values, and output by this module individually.<br>Does not affect values of tags passed in via the `tags` input.<br>Possible values: `lower`, `title`, `upper` and `none` (no transformation).<br>Set this to `title` and set `delimiter` to `""` to yield Pascal Case IDs.<br>Default value: `lower`. | `string` | `null` | no |
+| <a name="input_labels_as_tags"></a> [labels\_as\_tags](#input\_labels\_as\_tags) | Set of labels (ID elements) to include as tags in the `tags` output.<br>Default is to include all labels.<br>Tags with empty values will not be included in the `tags` output.<br>Set to `[]` to suppress all generated tags.<br>**Notes:**<br>  The value of the `name` tag, if included, will be the `id`, not the `name`.<br>  Unlike other `null-label` inputs, the initial setting of `labels_as_tags` cannot be<br>  changed in later chained modules. Attempts to change it will be silently ignored. | `set(string)` | <pre>[<br>  "default"<br>]</pre> | no |
+| <a name="input_name"></a> [name](#input\_name) | ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'.<br>This is the only ID element not also included as a `tag`.<br>The "name" tag is set to the full `id` string. There is no tag with the value of the `name` input. | `string` | `null` | no |
+| <a name="input_namespace"></a> [namespace](#input\_namespace) | ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique | `string` | `null` | no |
+| <a name="input_regex_replace_chars"></a> [regex\_replace\_chars](#input\_regex\_replace\_chars) | Terraform regular expression (regex) string.<br>Characters matching the regex will be removed from the ID elements.<br>If not set, `"/[^a-zA-Z0-9-]/"` is used to remove all characters other than hyphens, letters and digits. | `string` | `null` | no |
+| <a name="input_stage"></a> [stage](#input\_stage) | ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' | `string` | `null` | no |
+| <a name="input_tags"></a> [tags](#input\_tags) | Additional tags (e.g. `{'BusinessUnit': 'XYZ'}`).<br>Neither the tag keys nor the tag values will be modified by this module. | `map(string)` | `{}` | no |
+| <a name="input_tenant"></a> [tenant](#input\_tenant) | ID element \_(Rarely used, not included by default)\_. A customer identifier, indicating who this instance of a resource is for | `string` | `null` | no |
 
 ## Outputs
 
@@ -44,11 +47,12 @@ No resources.
 | <a name="output_additional_tag_map"></a> [additional\_tag\_map](#output\_additional\_tag\_map) | The merged additional\_tag\_map |
 | <a name="output_attributes"></a> [attributes](#output\_attributes) | List of attributes |
 | <a name="output_context"></a> [context](#output\_context) | Merged but otherwise unmodified input to this module, to be used as context input to other modules.<br>Note: this version will have null values as defaults, not the values actually used as defaults. |
-| <a name="output_delimiter"></a> [delimiter](#output\_delimiter) | Delimiter between `namespace`, `environment`, `stage`, `name` and `attributes` |
+| <a name="output_delimiter"></a> [delimiter](#output\_delimiter) | Delimiter between `namespace`, `tenant`, `environment`, `stage`, `name` and `attributes` |
+| <a name="output_descriptors"></a> [descriptors](#output\_descriptors) | Map of descriptors as configured by `descriptor_formats` |
 | <a name="output_enabled"></a> [enabled](#output\_enabled) | True if module is enabled, false otherwise |
 | <a name="output_environment"></a> [environment](#output\_environment) | Normalized environment |
-| <a name="output_id"></a> [id](#output\_id) | Disambiguated ID restricted to `id_length_limit` characters in total |
-| <a name="output_id_full"></a> [id\_full](#output\_id\_full) | Disambiguated ID not restricted in length |
+| <a name="output_id"></a> [id](#output\_id) | Disambiguated ID string restricted to `id_length_limit` characters in total |
+| <a name="output_id_full"></a> [id\_full](#output\_id\_full) | ID string not restricted in length |
 | <a name="output_id_length_limit"></a> [id\_length\_limit](#output\_id\_length\_limit) | The id\_length\_limit actually used to create the ID, with `0` meaning unlimited |
 | <a name="output_label_order"></a> [label\_order](#output\_label\_order) | The naming order actually used to create the ID |
 | <a name="output_name"></a> [name](#output\_name) | Normalized name |
@@ -57,5 +61,6 @@ No resources.
 | <a name="output_regex_replace_chars"></a> [regex\_replace\_chars](#output\_regex\_replace\_chars) | The regex\_replace\_chars actually used to create the ID |
 | <a name="output_stage"></a> [stage](#output\_stage) | Normalized stage |
 | <a name="output_tags"></a> [tags](#output\_tags) | Normalized Tag map |
-| <a name="output_tags_as_list_of_maps"></a> [tags\_as\_list\_of\_maps](#output\_tags\_as\_list\_of\_maps) | Additional tags as a list of maps, which can be used in several AWS resources |
+| <a name="output_tags_as_list_of_maps"></a> [tags\_as\_list\_of\_maps](#output\_tags\_as\_list\_of\_maps) | This is a list with one map for each `tag`. Each map contains the tag `key`,<br>`value`, and contents of `var.additional_tag_map`. Used in the rare cases<br>where resources need additional configuration information for each tag. |
+| <a name="output_tenant"></a> [tenant](#output\_tenant) | Normalized tenant |
 <!-- markdownlint-restore -->

examples/complete/.gitignore

@@ -1,4 +1,5 @@
 .terraform
+.terraform.lock.hcl
 **/.terraform/*
 *.tfstate
 *.tfstate.*