Function load_from_disk 

pub fn load_from_disk(path: &Path) -> Result<OfficialIndex>

What: Load an official package index from a JSON file on disk.

Inputs:

• path: File path to read the JSON index from.

Output:

• Returns Ok(OfficialIndex) with the deserialized index on success.
• Returns Err(ArchToolkitError::Io) if the file cannot be read.
• Returns Err(ArchToolkitError::Json) if the content is not valid index JSON.

Details:

• Rebuilds the name_to_idx HashMap after deserialization so O(1) name lookups via find_package_by_name() work immediately.
• Unlike Pacsea’s original implementation, errors are propagated instead of silently ignored; callers decide how to handle a missing or corrupt index.

Errors

Returns an error if the file cannot be read or the JSON cannot be parsed.

Example

use arch_toolkit::index::load_from_disk;
use std::path::Path;

let index = load_from_disk(Path::new("official_index.json"))?;
println!("Loaded {} packages", index.pkgs.len());