Add option for generating default config

src/main.rs

@@ -6,7 +6,10 @@ use std::{
     boxed::Box,
     error::Error,
 };
-use serde::Deserialize;
+use serde::{
+    Deserialize,
+    Serialize,
+};
 use sqlx::{
     prelude::*,
     sqlite::{
@@ -34,8 +37,13 @@ struct Options {
     /// Path to database
     #[structopt(short, long, value_name = "path", default_value = DEFAULT_DATABASE_PATH)]
     database_path: PathBuf,
+
+    /// Prints default config
+    #[structopt(long)]
+    generate_config: bool,
 }
 
+#[derive(Debug, Serialize, Deserialize)]
 #[serde(default, rename_all = "kebab-case")]
 struct Config {
     database_path: PathBuf,
@@ -53,7 +61,12 @@ impl Default for Config {
 async fn main() -> Result<(), Box<dyn Error>> {
     let clap_matches = Options::clap().get_matches();
     let options = Options::from_clap(&clap_matches);
-    
+
+    if options.generate_config {
+        println!("{}", toml::to_string_pretty(&Config::default())?);
+        return Ok(());
+    }
+
     let mut config = get_config(&options)?;
     
     if let Some(db_path) = clap_matches.value_of("database_path") {
@@ -99,15 +112,15 @@ fn get_config(options: &Options) -> std::io::Result<Config> {
     if options.no_config {
         Ok(Config::default())
     } else {
-    let mut config_file = File::open(&options.config)?;
-    let mut config_string = String::new();
-    config_file.read_to_string(&mut config_string)?;
-    
-    toml::from_str(&config_string)
-        .map_err(|err| std::io::Error::new(
-            std::io::ErrorKind::InvalidData, 
-            err
+        let mut config_file = File::open(&options.config)?;
+        let mut config_string = String::new();
+        config_file.read_to_string(&mut config_string)?;
+        
+        toml::from_str(&config_string)
+            .map_err(|err| std::io::Error::new(
+                std::io::ErrorKind::InvalidData, 
+                err
+            )
         )
-    )
-}
+    }
 }