feat: Add button to reset mod deployment

For now this merely recovers backed-up game files and leaves mod bundles
 in-tact. The game doesn't care about those anyways.

Closes #8.

crates/dtmm/src/engine.rs

@@ -547,6 +547,37 @@ pub(crate) async fn deploy_mods(state: State) -> Result<()> {
     Ok(())
 }
 
+#[tracing::instrument(skip(state))]
+pub(crate) async fn reset_mod_deployment(state: State) -> Result<()> {
+    let paths = [BUNDLE_DATABASE_NAME, BOOT_BUNDLE_NAME];
+    let bundle_dir = state.get_game_dir().join("bundle");
+
+    tracing::info!("Resetting mod deployment in {}", bundle_dir.display());
+
+    for p in paths {
+        let path = bundle_dir.join(p);
+        let backup = bundle_dir.join(&format!("{}.bak", p));
+
+        tracing::debug!(
+            "Copying from backup: {} -> {}",
+            backup.display(),
+            path.display()
+        );
+
+        fs::copy(&backup, &path)
+            .await
+            .wrap_err_with(|| format!("failed to '{}' restore from backup", p))?;
+
+        tracing::debug!("Deleting backup: {}", backup.display(),);
+
+        fs::remove_file(&backup)
+            .await
+            .wrap_err_with(|| format!("failed to remove  backup '{}'", p))?;
+    }
+
+    Ok(())
+}
+
 #[tracing::instrument(skip(state))]
 pub(crate) async fn import_mod(state: State, info: FileInfo) -> Result<ModInfo> {
     let data = fs::read(&info.path)

crates/dtmm/src/main.rs

@@ -19,10 +19,12 @@ use druid::SingleUse;
 use druid::Target;
 use engine::delete_mod;
 use engine::import_mod;
+use engine::reset_mod_deployment;
 use serde::Deserialize;
 use serde::Serialize;
 use state::ACTION_FINISH_ADD_MOD;
 use state::ACTION_FINISH_DELETE_SELECTED_MOD;
+use state::ACTION_FINISH_RESET_DEPLOYMENT;
 use tokio::runtime::Runtime;
 use tokio::sync::mpsc::UnboundedReceiver;
 use tokio::sync::RwLock;
@@ -102,6 +104,17 @@ fn work_thread(
                         )
                         .expect("failed to send command");
                 }),
+                AsyncAction::ResetDeployment(state) => tokio::spawn(async move {
+                    if let Err(err) = reset_mod_deployment(state).await {
+                        tracing::error!("Failed to reset mod deployment: {:?}", err);
+                    }
+
+                    event_sink
+                        .write()
+                        .await
+                        .submit_command(ACTION_FINISH_RESET_DEPLOYMENT, (), Target::Auto)
+                        .expect("failed to send command");
+                }),
             };
         }
     });

crates/dtmm/src/main_window.rs

@@ -7,7 +7,7 @@ use druid::{
     lens, FileDialogOptions, FileSpec, Insets, LensExt, SingleUse, Widget, WidgetExt, WindowDesc,
 };
 
-use crate::state::{ModInfo, PathBufFormatter, State, View};
+use crate::state::{ModInfo, PathBufFormatter, State, View, ACTION_START_RESET_DEPLOYMENT};
 use crate::state::{
     ACTION_ADD_MOD, ACTION_SELECTED_MOD_DOWN, ACTION_SELECTED_MOD_UP, ACTION_SELECT_MOD,
     ACTION_START_DELETE_SELECTED_MOD, ACTION_START_DEPLOY,
@@ -60,9 +60,11 @@ fn build_top_bar() -> impl Widget<State> {
                 )
                 .with_default_spacer()
                 .with_child(
-                    Button::new("Run Game").on_click(|_ctx, _state: &mut State, _env| {
-                        todo!();
-                    }),
+                    Button::new("Reset Mods")
+                        .on_click(|ctx, _state: &mut State, _env| {
+                            ctx.submit_command(ACTION_START_RESET_DEPLOYMENT);
+                        })
+                        .disabled_if(|data, _| !data.can_reset_deployment()),
                 ),
         )
         .padding(theme::TOP_BAR_INSETS)

crates/dtmm/src/state.rs

@@ -24,6 +24,11 @@ pub(crate) const ACTION_FINISH_DELETE_SELECTED_MOD: Selector<SingleUse<ModInfo>>
 pub(crate) const ACTION_START_DEPLOY: Selector = Selector::new("dtmm.action.start-deploy");
 pub(crate) const ACTION_FINISH_DEPLOY: Selector = Selector::new("dtmm.action.finish-deploy");
 
+pub(crate) const ACTION_START_RESET_DEPLOYMENT: Selector =
+    Selector::new("dtmm.action.start-reset-deployment");
+pub(crate) const ACTION_FINISH_RESET_DEPLOYMENT: Selector =
+    Selector::new("dtmm.action.finish-reset-deployment");
+
 pub(crate) const ACTION_ADD_MOD: Selector<FileInfo> = Selector::new("dtmm.action.add-mod");
 pub(crate) const ACTION_FINISH_ADD_MOD: Selector<SingleUse<ModInfo>> =
     Selector::new("dtmm.action.finish-add-mod");
@@ -145,6 +150,7 @@ pub(crate) struct State {
     mods: Vector<ModInfo>,
     selected_mod_index: Option<usize>,
     is_deployment_in_progress: bool,
+    is_reset_in_progress: bool,
     game_dir: Arc<PathBuf>,
     data_dir: Arc<PathBuf>,
     ctx: Arc<sdk::Context>,
@@ -163,6 +169,7 @@ impl State {
             mods: Vector::new(),
             selected_mod_index: None,
             is_deployment_in_progress: false,
+            is_reset_in_progress: false,
             game_dir: Arc::new(config.game_dir.unwrap_or_default()),
             data_dir: Arc::new(config.data_dir.unwrap_or_default()),
         }
@@ -208,6 +215,10 @@ impl State {
         !self.is_deployment_in_progress
     }
 
+    pub fn can_reset_deployment(&self) -> bool {
+        !self.is_reset_in_progress
+    }
+
     pub(crate) fn get_game_dir(&self) -> &PathBuf {
         &self.game_dir
     }
@@ -292,6 +303,7 @@ impl<T: Data> Lens<Vector<T>, Vector<(usize, T)>> for IndexedVectorLens {
 
 pub(crate) enum AsyncAction {
     DeployMods(State),
+    ResetDeployment(State),
     AddMod((State, FileInfo)),
     DeleteMod((State, ModInfo)),
 }
@@ -334,6 +346,23 @@ impl AppDelegate<State> for Delegate {
                 state.is_deployment_in_progress = false;
                 Handled::Yes
             }
+            cmd if cmd.is(ACTION_START_RESET_DEPLOYMENT) => {
+                if self
+                    .sender
+                    .send(AsyncAction::ResetDeployment(state.clone()))
+                    .is_ok()
+                {
+                    state.is_reset_in_progress = true;
+                } else {
+                    tracing::error!("Failed to queue action to reset mod deployment");
+                }
+
+                Handled::Yes
+            }
+            cmd if cmd.is(ACTION_FINISH_RESET_DEPLOYMENT) => {
+                state.is_reset_in_progress = false;
+                Handled::Yes
+            }
             cmd if cmd.is(ACTION_SELECT_MOD) => {
                 let index = cmd
                     .get(ACTION_SELECT_MOD)