Module template 

Product-neutral mail template registration and rendering helpers.

Products still own template codes, default subject/body content, runtime configuration keys, payload types, URLs, and localization. This module only provides the shared mechanics around a registered template catalog: variable metadata, placeholder substitution, HTML escaping, and text fallback generation.

Structs

MailTemplateCatalog

Runtime-composed template registry built from product and subsystem registrations.

MailTemplateCatalogBuilder

Builder used by products to assemble a mail template catalog from multiple subsystems.

MailTemplateDefinition

Registered metadata for one product mail template.

MailTemplateRegistry

A product-owned template registry.

RenderedMail

Rendered mail bodies produced from a template and placeholder values.

TemplatePlaceholderSet

Placeholder values for a render pass.

TemplateVariableGroup

Variable metadata for one registered template.

TemplateVariableItem

Variable metadata exposed to product admin UIs.

TemplateVariableSpec

One placeholder accepted by a template.

Enums

MailTemplateRegistryError

Validation error returned when a template registry has ambiguous registrations.

Functions

escape_html

Escapes text for insertion into HTML templates.

html_to_text

Converts simple HTML email content into a plain-text fallback.

render_placeholders

Replaces {{key}} placeholders with provided values.

render_template

Renders a subject and HTML template with placeholder values and derives text fallback.

Type Aliases

MailTemplateRegistrar

Function exported by a product subsystem to register its mail templates.