Cargo and Rust

[dawnandrew100]

I'm trying to use the time crate on the ryugod website which I have to cargo install since it's not part of the standard library. When I try to cargo add the crate, the terminal states that there's no cargo.toml file. If I cargo new PROJECTNAME and then cd into that new directory and then try to cargo add time, time is successfully installed BUT I'm unable to change the default cargo "Hello World" through the ryugod editor, only through the terminal.

[ryusatgat]

You need to build and run it manually.

ryugod@ryugod-server ~$ ls -al main.rs
-rw-r--r-- 1 ryugod ryugod 127  7월 21 12:43 main.rs
ryugod@ryugod-server ~$ cargo init
    Creating binary (application) package
note: see more `Cargo.toml` keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
ryugod@ryugod-server ~$ vi Cargo.toml

Append the time package below the dependencies section.

[package]
name = "ryugod"
version = "0.1.0"
edition = "2021"

[dependencies]
time = "0.3"

ryugod@ryugod-server ~$ cargo build && target/debug/ryugod

[dawnandrew100]

Thanks for your reply!

I just did some more tests and found that if I want to edit the file, I just need to type in the command mv main.rs src/main.rs after using the cargo init command. There's no need to use vi to manually add time since the cargo add time command works exactly as expected. cargo build && target/debug/ryugod runs the main.rs file under the src folder, so moving the file was the most important step.

So the workflow is more like

ryugod@ryugod-server ~$ cargo init
    Creating binary (application) package
note: see more `Cargo.toml` keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
ryugod@ryugod-server ~$ cargo add time
    Updating crates.io index
      Adding time v0.3.41 to dependencies
             Features:
             + alloc
             + std
             - formatting
             - large-dates
             - local-offset
             - macros
             - parsing
             - quickcheck
             - rand

Then to get the file in the right place

ryugod@ryugod-server ~$ mv main.rs src/main.rs

and this to actually run the file

ryugod@ryugod-server ~$ cargo run