Crate stitcher

stitcher

stitcher provides an ergonomic syntax for declaring deeply nested Rust data structures inline — useful for tests and fixtures where writing raw constructors would be noisy or tedious.

cargo add --dev stitcher

🔧 Features

• Declarative, readable inline data syntax
• Fully Serde-compatible
• Supports recursive partial defaults
• Allows copying other values with dot-notation syntax
• Support variable injection with $ syntax

✨ Example

use stitcher::stitch;
use serde::{Serialize, Deserialize};

let timezone = "Europe/London";

let scenario = stitch!(Scenario {
    schedules: [
        {
            name: "Morning Yoga",
            location: {
                name: "Studio 1",
                tz: $timezone,
            }
        },
        {
            name: "Evening Spin",
            location: schedules[0].location,
        }
    ]
});

#[derive(Debug, Default, Serialize, Deserialize)]
struct Location {
    name: String,
    tz: String,
}

#[derive(Debug, Default, Serialize, Deserialize)]
struct Schedule {
    name: String,
    location: Location,
}

#[derive(Debug, Default, Serialize, Deserialize)]
struct Scenario {
    schedules: Vec<Schedule>,
}

Macros

stitch

The stitch! macro.

Functions

deep_merge

Recursively merges values from over into base.

from_stitch_input

Constructs a type T from a stitched JSON value, applying recursive defaults and resolving internal references.

resolve_refs_in_place

Recursively resolves all __ref__... string markers in data, replacing them with actual values from root.