How to use GRMustache.swift with SwiftUI for dynamic content?

Render templates into strings using Template.render(), then display them in SwiftUI Text views. Load templates from bundle resources or strings, and update the data model to trigger re-renders as needed.

GRMustache.swift vs Stencil: which is better for Swift projects?

GRMustache.swift is Mustache-compliant with pure Swift integration, while Stencil uses a Django-like syntax. Choose based on preference for Mustache standards vs. more logic-oriented syntax and community size.

How to register a custom filter in GRMustache.swift?

Define a filter using the Filter() function, then register it with template.register(filter, forKey: "key"). For example, create an uppercase filter that transforms strings, as shown in the README's filter section.

Does GRMustache.swift support async rendering for performance?

No, the library does not explicitly support async rendering; rendering is synchronous. For heavy templates, manually offload work to background threads to avoid blocking the main thread.

Can GRMustache.swift load templates from a remote URL?

Yes, use Template(URL:) to load templates from URLs, enabling dynamic updates from web sources. This is part of the multiple template sources feature documented in the README.

What's the best way to handle errors in GRMustache.swift templates?

Use do-catch blocks and check for MustacheError types, which provide detailed info like line numbers, error kinds, and template IDs for debugging, as explained in the Errors section.

Open-Awesome

GRMustache

MITSwift7.0.0

A Swift implementation of Mustache templates with extensions like filters, template inheritance, and extensibility hooks.

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629 stars154 forks0 contributors

What is GRMustache?

GRMustache.swift is a Swift library for rendering Mustache templates in iOS, macOS, and tvOS applications. It provides full support for the Mustache syntax along with enhanced features like filters, template inheritance, and extensibility hooks, allowing developers to generate dynamic content without relying on the Objective-C runtime.

Target Audience

Swift developers building iOS, macOS, or tvOS applications who need to generate dynamic text or HTML content from templates, such as those creating report generators, email renderers, or UI components with reusable layouts.

Value Proposition

Developers choose GRMustache.swift for its pure Swift integration, which works seamlessly with Swift types and models without Objective-C runtime dependencies, and its extended Mustache features like filters and template inheritance that go beyond the minimalistic standard while maintaining compatibility.

Overview

Flexible Mustache templates for Swift

Use Cases

Best For

Generating dynamic HTML or text content in Swift-based Apple platform apps (iOS/macOS/tvOS)
Implementing template inheritance and reusable layouts in Mustache templates
Applying custom formatting and transformations via filters (e.g., uppercase, date formatting)
Loading templates from multiple sources like bundle resources, files, URLs, or strings
Extending Mustache with custom filters, formatters, and lambdas for advanced rendering logic
Debugging Mustache templates with detailed, Mustache-specific error handling

Not Ideal For

Projects targeting non-Apple platforms like web or Android, as it's Swift-only for iOS, macOS, and tvOS
Teams wanting templating with built-in logic for complex conditionals and loops, since Mustache is logic-less and requires data pre-processing
Applications requiring real-time, high-performance template rendering with minimal overhead, as extensibility features may add complexity
Developers seeking drop-in UI components or integration with SwiftUI, as it focuses solely on text/HTML templating without native UI bindings

Pros & Cons

Pros

Full Mustache Compliance

Supports all standard Mustache tags and expressions, ensuring compatibility with existing Mustache templates and tools across platforms.

Enhanced Templating Features

Adds filters, template inheritance, and extensibility hooks like custom lambdas, going beyond minimalistic Mustache for more dynamic rendering.

Pure Swift Integration

Works seamlessly with Swift types without Objective-C runtime dependencies, ideal for modern Swift projects on Apple platforms.

Flexible Template Loading

Allows loading templates from strings, bundle resources, files, URLs, or repositories, providing versatile management options as documented.

Cons

Swift Version Dependency

Frequent updates tied to Swift versions (e.g., separate releases for Swift 5.9, 6.0) require maintenance overhead when upgrading Swift.

Custom Type Boilerplate

For pure Swift types, developers must manually conform to MustacheBoxable protocol, adding extra code compared to Objective-C classes with KVC.

Limited Ecosystem

Has a smaller community and fewer third-party extensions compared to more popular templating engines, potentially limiting support and resources.

Frequently Asked Questions

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