fn apply_hunks_to_files()

in codex-rs/apply-patch/src/lib.rs [299:362]

• 63 lines of code
• 15 McCabe index (conditional complexity)

fn apply_hunks_to_files(hunks: &[Hunk]) -> anyhow::Result<AffectedPaths> {
    if hunks.is_empty() {
        anyhow::bail!("No files were modified.");
    }

    let mut added: Vec<PathBuf> = Vec::new();
    let mut modified: Vec<PathBuf> = Vec::new();
    let mut deleted: Vec<PathBuf> = Vec::new();
    for hunk in hunks {
        match hunk {
            Hunk::AddFile { path, contents } => {
                if let Some(parent) = path.parent() {
                    if !parent.as_os_str().is_empty() {
                        std::fs::create_dir_all(parent).with_context(|| {
                            format!("Failed to create parent directories for {}", path.display())
                        })?;
                    }
                }
                std::fs::write(path, contents)
                    .with_context(|| format!("Failed to write file {}", path.display()))?;
                added.push(path.clone());
            }
            Hunk::DeleteFile { path } => {
                std::fs::remove_file(path)
                    .with_context(|| format!("Failed to delete file {}", path.display()))?;
                deleted.push(path.clone());
            }
            Hunk::UpdateFile {
                path,
                move_path,
                chunks,
            } => {
                let AppliedPatch { new_contents, .. } =
                    derive_new_contents_from_chunks(path, chunks)?;
                if let Some(dest) = move_path {
                    if let Some(parent) = dest.parent() {
                        if !parent.as_os_str().is_empty() {
                            std::fs::create_dir_all(parent).with_context(|| {
                                format!(
                                    "Failed to create parent directories for {}",
                                    dest.display()
                                )
                            })?;
                        }
                    }
                    std::fs::write(dest, new_contents)
                        .with_context(|| format!("Failed to write file {}", dest.display()))?;
                    std::fs::remove_file(path)
                        .with_context(|| format!("Failed to remove original {}", path.display()))?;
                    modified.push(dest.clone());
                } else {
                    std::fs::write(path, new_contents)
                        .with_context(|| format!("Failed to write file {}", path.display()))?;
                    modified.push(path.clone());
                }
            }
        }
    }
    Ok(AffectedPaths {
        added,
        modified,
        deleted,
    })
}