Cargo add

Q: How deeply does Rust in Action: Systems programming concepts and techniques cover cargo add?

Explains the command, manifest edit, and subsequent compilation, but stops short of its implementation internals.

As explained in Rust in Action: Systems programming concepts and techniques

cargo add is a Cargo subcommand that adds a dependency declaration to a Rust project's manifest.

cargo add is a Cargo subcommand that adds a third-party crate to a Rust project's dependency declarations. It edits Cargo.toml for you, avoiding manual dependency changes. section 2.11 section 2.3.4

Use cargo add while building a project:

Create or enter a Cargo project, such as grep-lite or mandelbrot. section 2.11 section 2.7
Run cargo add regex@1 to add version 1 of the regex crate, or cargo add num to add num. section 2.11 section 2.7
Run cargo build or cargo run; Cargo retrieves and compiles the dependency before compiling the project. section 2.11 section 2.7

Adding a crate to a small program

From a new project directory, run cargo new grep-lite --vcs none, cd grep-lite, and cargo add regex@1. Cargo updates Cargo.toml; cargo build then downloads and compiles regex and its supporting crates. The program can use regex afterward. section 2.11

$ cargo add num 
    Updating 'https:/ /github.com/rust-lang/crates.io-index' index
      Adding num v0.4.0 to dependencies

Shows the command output that confirms cargo add inserted num v0.4.0 into the project's dependencies. section 2.3.4

How Rust in Action: Systems programming concepts and techniques covers it

Cover of Rust in Action: Systems programming concepts and techniques

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Learn Rust in a Month of Lunchescargo add is a Cargo command that adds an external crate dependency to a package manifest.

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