Function get_installed_version 

pub fn get_installed_version(name: &str) -> Result<String>

What: Retrieve the locally installed version of a package.

Inputs:

• name: Package to query via pacman -Q.

Output:

• Returns Ok(String) with the installed version string on success.
• Returns Err(ArchToolkitError::PackageNotFound) if the package is not installed.
• Returns Err(ArchToolkitError::Parse) if the version string cannot be parsed.

Details:

• Normalizes versions by removing revision suffixes to facilitate requirement comparisons.
• Parses format: “name version” or “name version-revision”.
• Strips revision suffix (e.g., “1.2.3-1” -> “1.2.3”).
• Sets LC_ALL=C and LANG=C for consistent locale-independent output.

Errors

• Returns PackageNotFound when the package is not installed.
• Returns Parse when the version string cannot be parsed from command output.

Example

use arch_toolkit::deps::get_installed_version;

let version = get_installed_version("pacman")?;
println!("Installed version: {}", version);