canlink-cli 0.3.3

Command-line interface for CAN hardware abstraction layer
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

//! List command implementation.
//!
//! Lists all available backends registered in the system.

use crate::error::CliResult;
use crate::output::{BackendListOutput, OutputFormatter};
use canlink_hal::BackendRegistry;

/// Execute the list command.
pub fn execute(formatter: &OutputFormatter) -> CliResult<()> {
    let registry = BackendRegistry::global();
    let backends = registry.list_backends();

    if formatter.is_json() {
        let output = BackendListOutput { backends };
        formatter.print(&output)?;
    } else if backends.is_empty() {
        formatter.print_message("No formal backends available")?;
    } else {
        formatter.print_message("Available backends:")?;
        for backend in backends {
            println!("  - {}", backend);
        }
    }

    Ok(())
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_list_empty_registry() {
        let registry = BackendRegistry::new();
        let backends = registry.list_backends();
        assert_eq!(backends.len(), 0);
    }
}