Default directory for storage and data-dir per command

With this PR we default to the proper OS default directory for storing application data.
Since the reset-config command does not require a data directory (and causes side effects with the default one), the data directory is not initialized per command.

swap/src/cli.rs

@@ -5,9 +5,12 @@ use uuid::Uuid;
 
 #[derive(structopt::StructOpt, Debug)]
 pub struct Options {
-    // TODO: Default value should points to proper configuration folder in home folder
+    #[structopt(
-    #[structopt(long = "data-dir", default_value = "./.swap-data/")]
+        long = "data-dir",
-    pub data_dir: String,
+        help = "Provide a custom path to the data directory.",
+        parse(from_os_str)
+    )]
+    pub data_dir: Option<PathBuf>,
 
     #[structopt(subcommand)]
     pub cmd: Command,
@@ -80,7 +83,7 @@ pub enum Resume {
 pub struct Config {
     #[structopt(
         long = "config",
-        help = "Provide a custom path to a configuration file. The configuration file must be a toml file.",
+        help = "Provide a custom path to the configuration file. The configuration file must be a toml file.",
         parse(from_os_str)
     )]
     pub config_path: Option<PathBuf>,

swap/src/fs.rs

@@ -6,17 +6,25 @@ use std::path::{Path, PathBuf};
 // Linux: /home/<user>/.config/xmr-btc-swap/
 // OSX: /Users/<user>/Library/Preferences/xmr-btc-swap/
 #[allow(dead_code)]
-fn config_dir() -> Option<PathBuf> {
+fn default_config_dir() -> Option<PathBuf> {
     ProjectDirs::from("", "", "xmr-btc-swap").map(|proj_dirs| proj_dirs.config_dir().to_path_buf())
 }
 
 #[allow(dead_code)]
 pub fn default_config_path() -> anyhow::Result<PathBuf> {
-    config_dir()
+    default_config_dir()
         .map(|dir| Path::join(&dir, "config.toml"))
         .context("Could not generate default configuration path")
 }
 
+/// This is to store the DB
+// Linux: /home/<user>/.local/share/nectar/
+// OSX: /Users/<user>/Library/Application Support/nectar/
+#[allow(dead_code)]
+pub fn default_data_dir() -> Option<std::path::PathBuf> {
+    ProjectDirs::from("", "", "nectar").map(|proj_dirs| proj_dirs.data_dir().to_path_buf())
+}
+
 pub fn ensure_directory_exists(file: &Path) -> Result<(), std::io::Error> {
     if let Some(path) = file.parent() {
         if !path.exists() {

swap/src/main.rs

@@ -20,7 +20,7 @@ use crate::{
 };
 use anyhow::{Context, Result};
 use database::Database;
-use fs::default_config_path;
+use fs::{default_config_path, default_data_dir};
 use prettytable::{row, Table};
 use protocol::{alice, bob, bob::Builder, SwapAmounts};
 use settings::Settings;
@@ -53,13 +53,18 @@ async fn main() -> Result<()> {
 
     let opt = Options::from_args();
 
+    let data_dir = if let Some(data_dir) = opt.data_dir {
+        data_dir
+    } else {
+        default_data_dir().context("unable to determine default data path")?
+    };
+
     info!(
         "Database and Seed will be stored in directory: {}",
-        opt.data_dir
+        data_dir.display()
     );
-    let data_dir = std::path::Path::new(opt.data_dir.as_str()).to_path_buf();
-    let db_path = data_dir.join("database");
 
+    let db_path = data_dir.join("database");
     let seed = config::seed::Seed::from_file_or_generate(&data_dir)
         .expect("Could not retrieve/initialize seed")
         .into();
@@ -78,7 +83,7 @@ async fn main() -> Result<()> {
                 btc: receive_bitcoin,
             };
 
-            let (bitcoin_wallet, monero_wallet) = setup_wallets(settings.wallets).await?;
+            let (bitcoin_wallet, monero_wallet) = init_wallets(settings.wallets).await?;
 
             let swap_id = Uuid::new_v4();
 
@@ -117,7 +122,7 @@ async fn main() -> Result<()> {
                 xmr: receive_monero,
             };
 
-            let (bitcoin_wallet, monero_wallet) = setup_wallets(settings.wallets).await?;
+            let (bitcoin_wallet, monero_wallet) = init_wallets(settings.wallets).await?;
 
             let swap_id = Uuid::new_v4();
 
@@ -162,7 +167,7 @@ async fn main() -> Result<()> {
         }) => {
             let settings = init_settings(config.config_path)?;
 
-            let (bitcoin_wallet, monero_wallet) = setup_wallets(settings.wallets).await?;
+            let (bitcoin_wallet, monero_wallet) = init_wallets(settings.wallets).await?;
 
             let alice_factory = alice::Builder::new(
                 seed,
@@ -187,7 +192,7 @@ async fn main() -> Result<()> {
         }) => {
             let settings = init_settings(config.config_path)?;
 
-            let (bitcoin_wallet, monero_wallet) = setup_wallets(settings.wallets).await?;
+            let (bitcoin_wallet, monero_wallet) = init_wallets(settings.wallets).await?;
 
             let bob_factory = Builder::new(
                 seed,
@@ -229,7 +234,7 @@ fn init_settings(config_path: Option<PathBuf>) -> Result<Settings> {
     Ok(settings)
 }
 
-async fn setup_wallets(settings: settings::Wallets) -> Result<(bitcoin::Wallet, monero::Wallet)> {
+async fn init_wallets(settings: settings::Wallets) -> Result<(bitcoin::Wallet, monero::Wallet)> {
     let bitcoin_wallet = bitcoin::Wallet::new(
         settings.bitcoin.wallet_name.as_str(),
         settings.bitcoin.bitcoind_url,