Templert

Templert is a lightweight, open-source templating engine designed to generate text and HTML from structured data. It emphasizes a small footprint, predictable behavior, and a simple syntax that can be embedded in web projects, command-line tools, and static site pipelines.

Core features include variables, conditionals, loops, and helpers called filters. Templates can include partials or reusable blocks, enabling modular design. Templert supports auto-escaping to help prevent injection vulnerabilities in HTML output and provides a sandboxed evaluation mode for untrusted templates. The syntax is designed to be readable and forgiving, with placeholders marked by double braces and control structures enclosed in tags.

Architecture and performance: Templert compiles templates to a lightweight intermediate representation or evaluates them at runtime depending on configuration. It keeps data binding separate from presentation by using a context object. The engine prioritizes deterministic rendering, caching of compiled templates, and safe template execution to minimize side effects.

Usage: A developer loads a template and provides a data context, such as title and a list of items. The engine renders the template to a string, applying loops to iterate data arrays and conditionals to include sections only when data meets criteria. Includes and macros enable reuse across different templates.

History and ecosystem: Templert emerged as an open-source project with contributions from a community of developers. It aims to be language-agnostic, offering bindings or ports to several programming languages and integration with build tools and static site generators. Documentation covers installation, template syntax, security considerations, and migration guidance between versions.