Struct ReverseDependencyAnalyzer 

pub struct ReverseDependencyAnalyzer;

Reverse dependency analyzer for removal operations.

This struct provides the main entry point for analyzing reverse dependencies for packages being removed. It performs BFS traversal to find all packages that depend on the removal targets.

Implementations

impl ReverseDependencyAnalyzer

pub const fn new() -> Self

What: Create a new reverse dependency analyzer.

Inputs:

• (none)

Output:

• Returns a new ReverseDependencyAnalyzer instance.

Details:

• Creates an analyzer with default configuration.

Example

use arch_toolkit::deps::ReverseDependencyAnalyzer;

let analyzer = ReverseDependencyAnalyzer::new();

pub fn analyze( &self, packages: &[PackageRef], ) -> Result<ReverseDependencyReport>

What: Analyze reverse dependencies for packages being removed.

Inputs:

• packages: A slice of PackageRef instances for packages being removed.

Output:

• Returns a Result containing ReverseDependencyReport on success, or an ArchToolkitError on failure.

Details:

• Performs breadth-first search (BFS) traversal using pacman -Qi metadata.
• Aggregates per-root relationships to track direct vs transitive dependents.
• Only analyzes installed packages (skips uninstalled packages).
• Returns empty report if no packages provided or all packages are uninstalled.

Errors

This function can return an ArchToolkitError if underlying pacman commands fail or if parsing their output encounters unexpected formats.

Example

use arch_toolkit::deps::ReverseDependencyAnalyzer;
use arch_toolkit::{PackageRef, PackageSource};

let analyzer = ReverseDependencyAnalyzer::new();
let packages = vec![
    PackageRef {
        name: "qt5-base".into(),
        version: "5.15.10".into(),
        source: PackageSource::Official {
            repo: "extra".into(),
            arch: "x86_64".into(),
        },
    },
];

let report = analyzer.analyze(&packages)?;
println!("{} packages would be affected", report.dependents.len());

Trait Implementations

impl Default for ReverseDependencyAnalyzer

fn default() -> Self

Returns the “default value” for a type.