Delete settings file if no wallet

And make launcher open default network directory
as the first directory with a settings file.

Fallback to the Create wallet view when no settings
file exist anymore or if the settings file has no wallet.

liana-gui/src/app/settings.rs

@@ -20,7 +20,7 @@ use crate::{
     services::{self, connect::client::backend},
 };
 
-pub const DEFAULT_FILE_NAME: &str = "settings.json";
+pub const SETTINGS_FILE_NAME: &str = "settings.json";
 
 #[derive(Debug, Clone, Default, Deserialize, Serialize)]
 pub struct Settings {
@@ -30,7 +30,7 @@ pub struct Settings {
 impl Settings {
     pub fn from_file(network_dir: &NetworkDirectory) -> Result<Settings, SettingsError> {
         let mut path = network_dir.path().to_path_buf();
-        path.push(DEFAULT_FILE_NAME);
+        path.push(SETTINGS_FILE_NAME);
 
         std::fs::read(path)
             .map_err(|e| match e.kind() {
@@ -52,7 +52,7 @@ pub async fn update_settings_file<F>(
 where
     F: FnOnce(Settings) -> Settings,
 {
-    let path = network_dir.path().join(DEFAULT_FILE_NAME);
+    let path = network_dir.path().join(SETTINGS_FILE_NAME);
     let file_exists = tokio::fs::try_exists(&path).await.unwrap_or(false);
 
     let mut file = OpenOptions::new()
@@ -81,6 +81,13 @@ where
 
     let settings = updater(settings);
 
+    if settings.wallets.is_empty() {
+        tokio::fs::remove_file(&path)
+            .await
+            .map_err(|e| SettingsError::ReadingFile(e.to_string()))?;
+        return Ok(());
+    }
+
     let content = serde_json::to_vec_pretty(&settings)
         .map_err(|e| SettingsError::WritingFile(format!("Failed to serialize settings: {}", e)))?;
 
@@ -351,6 +358,7 @@ impl KeySetting {
 pub enum SettingsError {
     NotFound,
     ReadingFile(String),
+    DeletingFile(String),
     WritingFile(String),
     Unexpected(String),
 }
@@ -359,6 +367,7 @@ impl std::fmt::Display for SettingsError {
         match self {
             Self::NotFound => write!(f, "Settings file not found"),
             Self::ReadingFile(e) => write!(f, "Error while reading file: {}", e),
+            Self::DeletingFile(e) => write!(f, "Error while deleting file: {}", e),
             Self::WritingFile(e) => write!(f, "Error while writing file: {}", e),
             Self::Unexpected(e) => write!(f, "Unexpected error: {}", e),
         }

liana-gui/src/launcher.rs

@@ -14,7 +14,10 @@ use lianad::config::ConfigError;
 use tokio::runtime::Handle;
 
 use crate::{
-    app::{self, settings::WalletSettings},
+    app::{
+        self,
+        settings::{self, WalletSettings},
+    },
     delete::{delete_wallet, DeleteError},
     dir::{LianaDirectory, NetworkDirectory},
     installer::UserFlow,
@@ -50,7 +53,13 @@ impl Launcher {
         let network = network.unwrap_or(
             NETWORKS
                 .iter()
-                .find(|net| datadir_path.path().join(net.to_string()).exists())
+                .find(|net| {
+                    datadir_path
+                        .path()
+                        .join(net.to_string())
+                        .join(settings::SETTINGS_FILE_NAME)
+                        .exists()
+                })
                 .cloned()
                 .unwrap_or(Network::Bitcoin),
         );
@@ -560,10 +569,18 @@ async fn check_network_datadir(path: NetworkDirectory) -> Result<State, String>
     })?;
     }
 
-    app::settings::Settings::from_file(&path)
-        .map(|s| State::Wallets {
-            wallets: s.wallets,
-            add_wallet: false,
-        })
-        .map_err(|e| e.to_string())
+    match settings::Settings::from_file(&path) {
+        Ok(s) => {
+            if s.wallets.is_empty() {
+                Ok(State::NoWallet)
+            } else {
+                Ok(State::Wallets {
+                    wallets: s.wallets,
+                    add_wallet: false,
+                })
+            }
+        }
+        Err(settings::SettingsError::NotFound) => Ok(State::NoWallet),
+        Err(e) => Err(e.to_string()),
+    }
 }