Question 1

How to preserve comments when editing TOML files in Rust?

Accepted Answer

Use the `toml_edit` crate from toml-rs, which provides an API to read, modify, and write TOML while keeping comments and formatting intact. It's designed specifically for format-preserving manipulation.

Question 2

What's the difference between the toml and toml_edit crates?

Accepted Answer

The `toml` crate focuses on serde integration for easy serialization/deserialization of Rust structs, while `toml_edit` is for editing TOML files without losing formatting. Use `toml` for config handling and `toml_edit` for precise modifications.

Question 3

toml-rs vs serde_json for configuration in Rust?

Accepted Answer

toml-rs is tailored for TOML with features like format-preserving editing, while serde_json is for JSON. Choose toml-rs if you prefer TOML's readability or need to preserve formatting; for JSON-based configs, serde_json is more suitable.

Question 4

How to handle datetime types in toml-rs?

Accepted Answer

toml-rs includes the `toml_datetime` crate for consistent datetime handling that aligns with TOML specifications. It ensures proper serialization and deserialization when working with serde across the crates.

Question 5

Is toml-rs good for parsing large TOML files?

Accepted Answer

toml-rs can parse large files, but the format-preserving features in `toml_edit` may add memory and performance overhead. For high-speed parsing without editing, consider using only the `toml` crate or a lighter alternative.

Question 6

How to get error locations when deserializing TOML with toml-rs?

Accepted Answer

Utilize the `serde_spanned` crate from toml-rs to capture spans during deserialization. This attaches source location data to errors, making debugging easier by identifying specific lines in the TOML file.

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