commit - e2466bf6fd47d5436c2b6319d83df6690c4423bb
commit + ee004920e3e72e46c80c7f6c4da6ff3b48cf6b46
blob - e5bcae02851e98b73e1f059ee4e76f222418e799
blob + abd6eaefdb548d8a5121acd417b285fcf4a8381e
--- src/cli.rs
+++ src/cli.rs
@@ -8,12 +8,15 @@ use std::path::PathBuf;
 #[clap(version = "0.1.0")]
 #[clap(about = "Fetch RSS Feeds and send them via E-Mail")]
 pub struct Cli {
+    // TODO: replace with default value instead of specifying an `Option`
     /// Custom path to database
     #[clap(long = "database", value_parser)]
     pub database_path: Option<PathBuf>,
+    // TODO: replace with default value instead of specifying an `Option`
     /// Custom path to configuration
     #[clap(long = "config", value_parser)]
     pub config_path: Option<PathBuf>,
+    // TODO: replace with default value instead of specifying an `Option`
     /// Custom path to URLs with RSS feeds being fetched
     #[clap(long = "urls", value_parser)]
     pub urls_path: Option<PathBuf>,
@@ -23,19 +26,30 @@ pub struct Cli {
 }
 
 impl Cli {
+    /// Parse the clap `Cli` struct with the command line arguments, create the directory for the
+    /// configuration files, and create the database if it does not exist yet.
     pub fn build_app() -> anyhow::Result<Self> {
+        use std::fs::{self, File};
+
         let mut args = Cli::parse();
+        let c_dir = config_dir();
 
+        // ensure project config directory exists
+        if !c_dir.exists() {
+            debug!("Config directory at {:?} does not exist, creating it.", c_dir);
+            fs::create_dir(c_dir)?;
+        }
+
         if args.database_path.is_none() {
             let db_path = database_path();
             args.database_path = Some(db_path.clone());
 
-            if std::fs::File::open(&db_path).is_err() {
+            if File::open(&db_path).is_err() {
                 debug!(
                     "No database file exists, creating a new one: {:?}",
                     &db_path
                 );
-                std::fs::File::create(&db_path)?;
+                File::create(&db_path)?;
             }
         }
         if args.config_path.is_none() {
@@ -49,6 +63,7 @@ impl Cli {
     }
 }
 
+/// Returns the base directory where all the configuration files are stored.
 fn config_dir() -> PathBuf {
     directories::ProjectDirs::from("", "", "rss-email")
         .unwrap()
@@ -56,14 +71,17 @@ fn config_dir() -> PathBuf {
         .to_path_buf()
 }
 
+/// Returns the path to the database.
 fn database_path() -> PathBuf {
     config_dir().join("cache.db")
 }
 
+/// Returns the path to the configuration file.
 fn config_path() -> PathBuf {
     config_dir().join("config.toml")
 }
 
+/// Returns the path to the urls file.
 fn urls_path() -> PathBuf {
     config_dir().join("urls")
 }