Method resolve_change_ref

atomic-cli/src/commands/diff/helpers.rs:835–871

Resolve a change reference (full hash or prefix) to a full hash.

(
        &self,
        repo: &Repository,
        change_ref: &str,
    )

    /// Resolve a change reference (full hash or prefix) to a full hash.
    pub(super) fn resolve_change_ref(
        &self,
        repo: &Repository,
        change_ref: &str,
    ) -> CliResult<Hash> {
        // Try to parse as a full hash first
        if let Some(hash) = Hash::from_base32(change_ref.as_bytes()) {
            if repo.has_change(&hash) {
                return Ok(hash);
            }
        }

        // Search for matching changes by prefix
        let mut matches: Vec<Hash> = Vec::new();
        let prefix_upper = change_ref.to_uppercase();

        for result in repo.iter_changes() {
            let hash = result.map_err(|e| CliError::Internal(anyhow::anyhow!("{}", e)))?;
            let hash_str = hash.to_base32();
            if hash_str.starts_with(&prefix_upper) {
                matches.push(hash);
            }
        }

        match matches.len() {
            0 => Err(CliError::ChangeNotFound {
                hash: change_ref.to_string(),
            }),
            1 => Ok(matches[0]),
            _ => {
                let match_list: Vec<String> = matches.iter().map(|h| h.to_base32()).collect();
                Err(CliError::AmbiguousHash {
                    hash: format!("{} (matches: {})", change_ref, match_list.join(", ")),
                })
            }
        }
    }
}

/// Build the real per-file unified diff for a recorded change WITHOUT printing.