Function determine_dependency_source 

pub fn determine_dependency_source<S: BuildHasher>(
    name: &str,
    installed: &HashSet<String, S>,
) -> (DependencySource, bool)

What: Infer the origin repository for a dependency currently under analysis.

Inputs:

• name: Candidate dependency package name.
• installed: Set of locally installed package names used to detect presence.

Output:

• Returns a tuple with the determined DependencySource and a flag indicating core membership.

Details:

• Prefers inspecting pacman -Qi metadata when the package is installed; otherwise defaults to heuristics.
• For installed packages: uses pacman -Qi to read the “Repository” field.
• For uninstalled packages: uses pacman -Si to check if it exists in official repositories.
• Handles local packages (repo = “local” or empty) specially.
• Downgrades gracefully to official classifications when the repository field cannot be read.
• Sets LC_ALL=C and LANG=C for consistent locale-independent output.
• Returns reasonable defaults when pacman is unavailable (graceful degradation).

Example

use arch_toolkit::deps::determine_dependency_source;
use std::collections::HashSet;

let installed = HashSet::from(["glibc".to_string()]);
let (source, is_core) = determine_dependency_source("glibc", &installed);
println!("Source: {:?}, Is core: {}", source, is_core);