calliope
An Elixir parser that renders HAML templates into HTML with embedded Elixir code support.
What is calliope?
Calliope is an Elixir-based HAML parser that converts HAML templates into HTML. It allows developers to use HAML's concise, whitespace-sensitive syntax while embedding Elixir code directly within templates. This solves the problem of writing verbose HTML by providing a cleaner, more expressive templating language integrated with Elixir's functional capabilities.
Elixir developers who prefer HAML syntax over traditional HTML or other templating engines, particularly those building web applications where clean, maintainable templates are a priority.
Developers choose Calliope because it combines HAML's elegant syntax with Elixir's power, offering features like embedded Elixir logic, precompilation for performance, and seamless integration into Elixir projects. It provides a familiar HAML experience while leveraging Elixir's strengths.
Overview
An elixir haml parser
Use Cases
Best For
- Converting HAML templates to HTML in Elixir web applications
- Embedding Elixir logic directly within templates for dynamic content
- Precompiling templates for improved rendering performance
- Using HAML syntax with layouts and partials in Elixir projects
- Simplifying HTML generation with whitespace-sensitive shorthand
- Integrating HAML-based templating into Phoenix or other Elixir frameworks
Not Ideal For
- Projects requiring immediate support for partials or reusable template components, as these are listed as 'Coming Soon'.
- Teams heavily invested in Phoenix's default EEx templates, where switching adds integration complexity without clear benefits.
- Developers unfamiliar with HAML syntax who prefer more verbose but standard HTML or Elixir's native EEx templating.
- Applications needing extensive templating features beyond basic HAML, such as filters or helpers not mentioned in the README.
Pros & Cons
Pros
Uses HAML's whitespace-sensitive shorthand to eliminate end-tags, making templates cleaner and more readable, as shown in the example converting HAML to HTML without verbose markup.
Allows embedding Elixir code like for loops, if statements, and anonymous functions directly in templates, enabling dynamic content without context switching, as demonstrated in the Embedded Elixir section.
Includes an engine to precompile templates into functions at compile time, improving runtime rendering speed, detailed in the Precompile Templates section with configurable options.
Supports layouts with configurable directories and scoping, allowing for consistent page structures, as explained with examples for setting layout and using content_with_layout.
Cons
Key templating features like partial rendering and improved exception messages are not yet implemented, limiting its usefulness for complex applications, as admitted in the 'Coming Soon' section.
Requires developers to learn HAML syntax, which is not standard in the Elixir ecosystem and may pose a learning curve for teams accustomed to EEx or HTML, despite the concise benefits.
As a specialized HAML parser for Elixir, it likely has a smaller community and fewer resources compared to mainstream options like EEx, which could affect troubleshooting and long-term maintenance.
Frequently Asked Questions
Related Projects
templeAn HTML DSL for Elixir and Phoenix
slimeMinimalistic HTML templates for Elixir, inspired by Slim.
bbmustacheBinary pattern match Based Mustache template engine for Erlang/OTP.
emlLibrary for writing and manipulating (html) markup in Elixir.
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