Method show_change_diff

atomic-cli/src/commands/diff/helpers.rs:400–434

Show the diff for a specific change by hash or prefix. This displays the content introduced by the change using state-based content retrieval. For each file modified by the change, we retrieve: - The file content BEFORE the change was applied (parent state) - The file content AFTER the change was applied (current state) Then we compute a proper diff between the two states, with optional word-lev

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

    /// Then we compute a proper diff between the two states, with optional
    /// word-level highlighting for code review.
    pub(super) fn show_change_diff(
        &self,
        repo: &Repository,
        change_ref: &str,
        config: &DiffOutputConfig,
    ) -> CliResult<()> {
        // Resolve the change reference (full hash or prefix)
        let hash = self.resolve_change_ref(repo, change_ref)?;

        // Load the change
        let change =
            repo.change_store()
                .load_change(&hash)
                .map_err(|_e| CliError::ChangeNotFound {
                    hash: change_ref.to_string(),
                })?;

        // Git-imported changes carry Git's captured +/- lines in unhashed
        // metadata. Use that directly for review output before considering
        // FileOps or the expensive graph reconstruction fallback. Graph-first
        // imported changes may intentionally have no FileOps yet.
        if let Some((file_diffs, stats)) = Self::build_git_import_file_diffs(&change) {
            let (file_diffs, stats) = self.filter_file_diffs(file_diffs, stats);
            return self.print_change_file_diffs(&change, &hash, config, file_diffs, stats);
        }

        // Check if change has semantic layer (file_ops)
        if change.has_file_ops() {
            // Use the semantic layer for human-readable diff
            return self.show_change_diff_from_file_ops(repo, &change, &hash, config);
        }

        // Fallback: compute diff from content (legacy path)
        self.show_change_diff_computed(repo, &change, &hash, config)
    }

    /// Show diff using the semantic layer (FileOps).
    ///