gix-pack 0.77.0

Implements git packs and related data structures
Documentation 
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use gix_error::{Result, validation};

use std::path::Path;

use gix_error::{OptionExt, bail};

use crate::Bundle;

/// Initialization
impl Bundle {
    /// Create a `Bundle` from `path`, which is either a pack file _(*.pack)_ or an index file _(*.idx)_.
    ///
    /// The corresponding complementary file is expected to be present.
    ///
    /// The `object_hash` is a way to read (and write) the same file format with different hashes, as the hash kind
    /// isn't stored within the file format itself.
    pub fn at(path: impl AsRef<Path>, object_hash: gix_hash::Kind) -> Result<Self> {
        Self::at_inner(path.as_ref(), object_hash)
    }

    fn at_inner(path: &Path, object_hash: gix_hash::Kind) -> Result<Self> {
        let ext = path.extension().and_then(std::ffi::OsStr::to_str).ok_or_raise(|| {
            validation(format!(
                "An 'idx' extension is expected of an index file: \"{}\"",
                path.display()
            ))
        })?;
        Ok(match ext {
            "idx" => Self {
                index: crate::index::File::at(path, object_hash)?,
                pack: crate::data::File::at(path.with_extension("pack"), object_hash)?,
            },
            "pack" => Self {
                pack: crate::data::File::at(path, object_hash)?,
                index: crate::index::File::at(path.with_extension("idx"), object_hash)?,
            },
            _ => {
                bail!(validation(format!(
                    "An 'idx' extension is expected of an index file: \"{}\"",
                    path.display()
                )));
            }
        })
    }
}