zoi_plugins/

extension.rs

use std::fs;
use std::path::PathBuf;

use anyhow::{Result, anyhow};
use mlua::LuaSerdeExt;
use zoi_core::{config, pgp, types};
use zoi_hooks as hooks;
use zoi_lua;
use zoi_resolver::{local, resolve};

use crate::PluginManager;

/// Filename used to store the persistent state of an extension.
const EXTENSION_STATE_FILE: &str = "extension-state.yaml";

/// Represents the persistent state of an installed extension, allowing for
/// rollbacks.
#[derive(Debug, Clone, Default, serde::Serialize, serde::Deserialize)]
struct ExtensionState {
    /// The default registry configuration before the extension was added.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    previous_default_registry: Option<types::Registry>,
    /// The path to the project file created by the extension, if any.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    project_file_path: Option<PathBuf>,
    /// Metadata about the installed extension itself.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    installed_extension: Option<types::ExtensionInfo>
}

/// Returns the path to the extension state file for a given manifest.
fn get_extension_state_path(
    manifest: &types::InstallManifest
) -> Result<PathBuf> {
    let version_dir = local::get_package_version_dir(
        manifest.scope,
        &manifest.registry_handle,
        &manifest.repo,
        &manifest.name,
        &manifest.version
    )?;
    Ok(version_dir.join(EXTENSION_STATE_FILE))
}

/// Writes the extension state to disk.
fn write_extension_state(
    manifest: &types::InstallManifest,
    extension_state: &ExtensionState
) -> Result<()> {
    let state_path = get_extension_state_path(manifest)?;
    fs::write(state_path, serde_yaml::to_string(extension_state)?)?;
    Ok(())
}

/// Reads the extension state from disk, if it exists.
fn read_extension_state(
    manifest: &types::InstallManifest
) -> Result<Option<ExtensionState>> {
    let state_path = get_extension_state_path(manifest)?;
    if !state_path.exists() {
        return Ok(None);
    }
    let content = fs::read_to_string(state_path)?;
    Ok(Some(serde_yaml::from_str(&content)?))
}

/// Restores the default registry to its previous state.
fn restore_default_registry(
    saved_state: Option<&ExtensionState>,
    added_registry_url: &str
) -> Result<()> {
    if let Some(saved_state) = saved_state {
        return config::set_user_default_registry(
            saved_state.previous_default_registry.clone()
        );
    }

    let user_config = config::read_user_config()?;
    let should_clear = user_config
        .default_registry
        .as_ref()
        .is_some_and(|registry| registry.url == added_registry_url);
    if should_clear {
        config::set_user_default_registry(None)?;
    }
    Ok(())
}

/// Checks if the extension state contains any data that needs to be persisted.
fn extension_state_requires_persistence(
    extension_state: &ExtensionState
) -> bool {
    extension_state.previous_default_registry.is_some()
        || extension_state.project_file_path.is_some()
        || extension_state.installed_extension.is_some()
}

/// Returns the path to the project file, either from saved state or the
/// default.
fn get_project_file_path(saved_state: Option<&ExtensionState>) -> PathBuf {
    saved_state
        .and_then(|state| state.project_file_path.clone())
        .unwrap_or_else(|| PathBuf::from("zoi.lua"))
}

/// Extracts the repository name from a git URL.
fn get_repo_name_from_url(url: &str) -> &str {
    url.trim_end_matches('/')
        .split('/')
        .next_back()
        .unwrap_or_default()
        .trim_end_matches(".git")
}

/// Reverts a specific change made by an extension.
fn revert_extension_change(
    change: &types::ExtensionChange,
    saved_state: Option<&ExtensionState>
) -> Result<()> {
    match change {
        types::ExtensionChange::RepoGit { add } => {
            let repo_name = get_repo_name_from_url(add);
            if !repo_name.is_empty() {
                config::remove_git_repo(repo_name)?;
            }
        }
        types::ExtensionChange::RegistryRepo { add } => {
            restore_default_registry(saved_state, add)?;
        }
        types::ExtensionChange::RegistryAdd { add } => {
            config::remove_added_registry(add)?;
        }
        types::ExtensionChange::RepoAdd { add } => {
            config::remove_repo(add)?;
        }
        types::ExtensionChange::Project { add: _ } => {
            let project_file_path = get_project_file_path(saved_state);
            if project_file_path.exists() {
                fs::remove_file(project_file_path)?;
            }
        }
        types::ExtensionChange::Pgp { name, key: _ } => {
            pgp::remove_key_by_name(name)?;
        }
        types::ExtensionChange::Plugin { name, script: _ } => {
            let plugin_dir = crate::get_plugin_dir()?;
            let plugin_path = plugin_dir.join(format!("{name}.lua"));
            if plugin_path.exists() {
                fs::remove_file(plugin_path)?;
            }
        }
        types::ExtensionChange::Hook { name, content: _ } => {
            let hooks_dir = hooks::global::get_user_hooks_dir()?;
            let hook_path = hooks_dir.join(format!("{name}.hook.yaml"));
            if hook_path.exists() {
                fs::remove_file(hook_path)?;
            }
        }
    }
    Ok(())
}

/// Installs an extension, applying its declared changes to the system and
/// registry configuration.
///
/// # Errors
///
/// Returns an error if the extension package cannot be resolved, if it's not an
/// extension package, or if applying any of the changes fails.
pub fn add(
    ext_name: &str,
    yes: bool,
    plugin_manager: Option<&PluginManager>
) -> Result<()> {
    println!("Adding extension: {ext_name}");

    let (pkg, _, _, pkg_lua_path, registry_handle, repo_type, _) =
        resolve::resolve_package_and_version(ext_name, None, false, yes)?;

    if pkg.package_type != types::PackageType::Extension {
        return Err(anyhow!("'{ext_name}' is not an extension package."));
    }

    let mut pkg_val = None;
    if let Some(pm) = plugin_manager {
        let v = pm
            .lua
            .to_value(&pkg)
            .map_err(|e: mlua::Error| anyhow!(e.to_string()))?;
        pm.trigger_hook("on_pre_extension_add", Some(&v.clone()))?;
        pkg_val = Some(v);
    }

    let Some(extension_info) = pkg.extension else {
        return Err(anyhow!(
            "'{ext_name}' is an extension package but contains no extension \
             data."
        ));
    };
    if extension_info.extension_type != "zoi" {
        return Err(anyhow!(
            "Unsupported extension type: {}",
            extension_info.extension_type
        ));
    }
    let has_registry_repo_change =
        extension_info.changes.iter().any(|change| {
            matches!(change, types::ExtensionChange::RegistryRepo { .. })
        });
    let has_project_change = extension_info
        .changes
        .iter()
        .any(|change| matches!(change, types::ExtensionChange::Project { .. }));
    let previous_default_registry = if has_registry_repo_change {
        config::read_user_config()?.default_registry.clone()
    } else {
        None
    };
    let project_file_path = if has_project_change {
        Some(std::env::current_dir()?.join("zoi.lua"))
    } else {
        None
    };
    let extension_state = ExtensionState {
        previous_default_registry,
        project_file_path,
        installed_extension: Some(extension_info.clone())
    };

    let manifest = types::InstallManifest {
        name: pkg.name.clone(),
        version: pkg.version.clone().unwrap_or_default(),
        epoch: pkg.epoch,
        revision: pkg.revision.clone(),
        sub_package: None,
        repo: pkg.repo.clone(),
        repo_type: repo_type.unwrap_or_else(|| "unofficial".to_string()),
        registry_handle: registry_handle.unwrap_or_default(),
        package_type: pkg.package_type,
        description: pkg.description.clone(),
        reason: types::InstallReason::Direct,
        scope: pkg.scope,
        bins: None,
        alternatives: None,
        conflicts: None,
        replaces: None,
        provides: None,
        backup: None,
        installed_dependencies: vec![],
        dependencies_v2: None,
        chosen_options: vec![],
        chosen_optionals: vec![],
        install_method: None,
        platform: zoi_core::utils::get_platform().unwrap_or_default(),
        service: None,
        installed_files: vec![],
        file_digests: None,
        installed_size: pkg.installed_size,
        sandbox: None,
        completions: None
    };
    let mut wrote_manifest = false;
    let mut applied_changes = Vec::new();
    let add_result = (|| -> Result<()> {
        if extension_state_requires_persistence(&extension_state) {
            local::write_manifest(&manifest)?;
            local::persist_package_source(&manifest, &pkg_lua_path)?;
            wrote_manifest = true;
            write_extension_state(&manifest, &extension_state)?;
        }

        println!("Applying extension changes...");
        for change in &extension_info.changes {
            match change {
                types::ExtensionChange::RepoGit { add } => {
                    println!("Adding git repository: {add}");
                    config::clone_git_repo(add)?;
                }
                types::ExtensionChange::RegistryRepo { add } => {
                    println!("Setting registry to: {add}");
                    config::set_default_registry(add)?;
                }
                types::ExtensionChange::RegistryAdd { add } => {
                    println!("Adding registry: {add}");
                    config::add_added_registry(add)?;
                }
                types::ExtensionChange::RepoAdd { add } => {
                    println!("Adding repository: {add}");
                    config::add_repo(add)?;
                }
                types::ExtensionChange::Project { add } => {
                    let project_file_path =
                        get_project_file_path(Some(&extension_state));
                    println!("Creating {}...", project_file_path.display());
                    if project_file_path.exists() {
                        return Err(anyhow!(
                            "A 'zoi.lua' file already exists at '{}'. Please \
                             remove it first.",
                            project_file_path.display()
                        ));
                    }
                    fs::write(&project_file_path, add)?;
                }
                types::ExtensionChange::Pgp { name, key } => {
                    println!("Adding PGP key: {name} from {key}");
                    if key.starts_with("http") {
                        pgp::add_key_from_url(key, name, false)?;
                    } else {
                        pgp::add_key_from_fingerprint(key, name, false)?;
                    }
                }
                types::ExtensionChange::Plugin { name, script } => {
                    println!("Adding plugin: {name}");
                    let plugin_dir = crate::get_plugin_dir()?;
                    let plugin_path = plugin_dir.join(format!("{name}.lua"));
                    fs::write(plugin_path, script)?;
                }
                types::ExtensionChange::Hook { name, content } => {
                    println!("Adding global hook: {name}");
                    let hooks_dir = hooks::global::get_user_hooks_dir()?;
                    let hook_path = hooks_dir.join(format!("{name}.hook.yaml"));
                    fs::write(hook_path, content)?;
                }
            }
            applied_changes.push(change.clone());
        }
        if !wrote_manifest {
            local::write_manifest(&manifest)?;
            local::persist_package_source(&manifest, &pkg_lua_path)?;
            wrote_manifest = true;
        }
        Ok(())
    })();
    if let Err(error) = add_result {
        for change in applied_changes.iter().rev() {
            if let Err(rollback_error) =
                revert_extension_change(change, Some(&extension_state))
            {
                eprintln!(
                    "Warning: failed to roll back extension change \
                     {change:?}: {rollback_error}"
                );
            }
        }
        if wrote_manifest
            && let Ok(package_dir) = local::get_package_dir(
                manifest.scope,
                &manifest.registry_handle,
                &manifest.repo,
                &manifest.name
            )
        {
            let _ = fs::remove_dir_all(package_dir);
        }
        return Err(error);
    }

    if let (Some(pm), Some(v)) = (plugin_manager, pkg_val) {
        pm.trigger_hook_nonfatal("on_post_extension_add", Some(&v));
    }

    println!("Successfully added extension '{ext_name}'.");

    Ok(())
}

/// Uninstalls an extension and reverts all changes it made to the system and
/// configuration.
///
/// # Errors
///
/// Returns an error if the extension is not installed, if it's not an extension
/// package, or if reverting any of the changes fails.
pub fn remove(
    ext_name: &str,
    yes: bool,
    plugin_manager: Option<&PluginManager>
) -> Result<()> {
    println!("Removing extension: {ext_name}");

    let request = resolve::parse_source_string(ext_name)?;
    let mut candidates = Vec::new();
    for scope in [
        types::Scope::Project,
        types::Scope::User,
        types::Scope::System
    ] {
        candidates
            .extend(local::find_installed_manifests_matching(&request, scope)?);
    }

    if candidates.is_empty() {
        return Err(anyhow!("Extension '{ext_name}' is not installed."));
    }

    let manifest = select_candidate(ext_name, candidates, yes)?;
    let scope = manifest.scope;

    let mut manifest_val = None;
    if let Some(pm) = plugin_manager {
        let v = pm
            .lua
            .to_value(&manifest)
            .map_err(|e: mlua::Error| anyhow!(e.to_string()))?;
        pm.trigger_hook("on_pre_extension_remove", Some(&v.clone()))?;
        manifest_val = Some(v);
    }

    if manifest.package_type != types::PackageType::Extension {
        return Err(anyhow!("'{ext_name}' is not an extension package."));
    }

    let installed_source_path = local::get_package_source_path(&manifest)?;
    let pkg = if installed_source_path.exists() {
        let path = installed_source_path.to_str().ok_or_else(|| {
            anyhow!("Stored package source path contains invalid UTF-8")
        })?;
        zoi_lua::parser::parse_lua_package(
            path,
            Some(&manifest.version),
            Some(manifest.scope),
            true
        )?
    } else {
        let source = local::installed_manifest_source(&manifest);
        let (pkg, _, _, _, _, _, _) = resolve::resolve_package_and_version(
            &source,
            Some(manifest.scope),
            true,
            yes
        )?;
        pkg
    };

    let extension_state = read_extension_state(&manifest)?;
    let extension_info = extension_state
        .as_ref()
        .and_then(|state| state.installed_extension.clone())
        .or(pkg.extension);

    if let Some(extension_info) = extension_info {
        if extension_info.extension_type != "zoi" {
            return Err(anyhow!(
                "Unsupported extension type: {}",
                extension_info.extension_type
            ));
        }

        println!("Reverting extension changes...");
        for change in extension_info.changes.iter().rev() {
            match change {
                types::ExtensionChange::RepoGit { add } => {
                    let repo_name = get_repo_name_from_url(add);
                    if !repo_name.is_empty() {
                        println!("Removing git repository: {repo_name}");
                        if let Err(e) = revert_extension_change(
                            change,
                            extension_state.as_ref()
                        ) {
                            eprintln!(
                                "Warning: failed to remove git repo \
                                 '{repo_name}': {e}"
                            );
                        }
                    }
                }
                types::ExtensionChange::RegistryRepo { add: _ } => {
                    println!("Restoring previous default registry");
                    if let Err(e) = revert_extension_change(
                        change,
                        extension_state.as_ref()
                    ) {
                        eprintln!(
                            "Warning: failed to restore default registry: {e}"
                        );
                    }
                }
                types::ExtensionChange::RegistryAdd { add } => {
                    println!("Removing registry: {add}");
                    if let Err(e) = revert_extension_change(
                        change,
                        extension_state.as_ref()
                    ) {
                        eprintln!(
                            "Warning: failed to remove registry '{add}': {e}"
                        );
                    }
                }
                types::ExtensionChange::RepoAdd { add } => {
                    println!("Removing repository: {add}");
                    if let Err(e) = revert_extension_change(
                        change,
                        extension_state.as_ref()
                    ) {
                        eprintln!(
                            "Warning: failed to remove repo '{add}': {e}"
                        );
                    }
                }
                types::ExtensionChange::Project { add: _ } => {
                    let project_file_path =
                        get_project_file_path(extension_state.as_ref());
                    println!("Removing {}...", project_file_path.display());
                    if let Err(e) = revert_extension_change(
                        change,
                        extension_state.as_ref()
                    ) {
                        eprintln!(
                            "Warning: failed to remove '{}': {e}",
                            project_file_path.display()
                        );
                    }
                }
                types::ExtensionChange::Pgp { name, key: _ } => {
                    println!("Removing PGP key: {name}");
                    if let Err(e) = revert_extension_change(
                        change,
                        extension_state.as_ref()
                    ) {
                        eprintln!(
                            "Warning: failed to remove PGP key '{name}': {e}"
                        );
                    }
                }
                types::ExtensionChange::Plugin { name, script: _ } => {
                    println!("Removing plugin: {name}");
                    if let Err(e) = revert_extension_change(
                        change,
                        extension_state.as_ref()
                    ) {
                        eprintln!(
                            "Warning: failed to remove plugin '{name}': {e}"
                        );
                    }
                }
                types::ExtensionChange::Hook { name, content: _ } => {
                    println!("Removing global hook: {name}");
                    if let Err(e) = revert_extension_change(
                        change,
                        extension_state.as_ref()
                    ) {
                        eprintln!(
                            "Warning: failed to remove global hook '{name}': \
                             {e}"
                        );
                    }
                }
            }
        }
    } else {
        return Err(anyhow!(
            "'{ext_name}' is an extension package but contains no extension \
             data."
        ));
    }

    let package_dir = local::get_package_dir(
        scope,
        &manifest.registry_handle,
        &manifest.repo,
        &manifest.name
    )?;

    if package_dir.exists() {
        fs::remove_dir_all(&package_dir)?;
    }

    if let (Some(pm), Some(v)) = (plugin_manager, manifest_val) {
        pm.trigger_hook_nonfatal("on_post_extension_remove", Some(&v));
    }

    println!("Successfully removed extension '{ext_name}'.");

    Ok(())
}

/// Prompts the user to select one extension if multiple candidates match the
/// request.
fn select_candidate(
    package_name: &str,
    candidates: Vec<types::InstallManifest>,
    yes: bool
) -> Result<types::InstallManifest> {
    use colored::Colorize;
    use comfy_table::Table;
    use comfy_table::presets::UTF8_FULL;
    use dialoguer::Select;
    use dialoguer::theme::ColorfulTheme;

    if candidates.is_empty() {
        return Err(anyhow!("Package '{package_name}' is not installed."));
    }
    if candidates.len() == 1 {
        return Ok(candidates
            .into_iter()
            .next()
            .expect("Already checked length"));
    }
    if yes {
        return Err(anyhow!(
            "Package '{package_name}' matches multiple installed packages. \
             Use an explicit source like '#handle@repo/name[:sub]@version'."
        ));
    }

    let displays: Vec<_> = candidates
        .iter()
        .map(|m| {
            let source = local::installed_manifest_source(m);
            let scope_label = match m.scope {
                types::Scope::User => "user",
                types::Scope::System => "system",
                types::Scope::Project => "project"
            };
            format!("{} ({}, v{})", source, scope_label, m.version)
        })
        .collect();

    let mut table = Table::new();
    table.load_style(UTF8_FULL);
    table.set_header(vec!["#", "Source", "Version"]);
    for (i, m) in candidates.iter().enumerate() {
        table.add_row(vec![
            (i + 1).to_string(),
            local::installed_manifest_source(m),
            m.version.clone(),
        ]);
    }
    println!(
        "Found multiple installed packages matching '{}'. Please choose one:",
        package_name.cyan()
    );
    println!("{table}");

    let selection = Select::with_theme(&ColorfulTheme::default())
        .with_prompt("Select an installed package")
        .items(&displays)
        .default(0)
        .interact()?;

    Ok(candidates
        .get(selection)
        .cloned()
        .expect("Invalid selection"))
}