Add config reading

src/main.rs

@@ -1,5 +1,11 @@
 use structopt::StructOpt;
-use std::path::PathBuf;
+use std::{
+    path::PathBuf,
+    fs::File,
+    io::prelude::*,
+    boxed::Box,
+    error::Error,
+};
 use serde::Deserialize;
 
 const DEFAULT_DATABASE_PATH: &'static str = "/var/lib/noise-server/noise-server.sqlite";
@@ -17,7 +23,6 @@ struct Options {
 #[serde(default)]
 struct Config {
     database_path: PathBuf,
-
 }
 
 impl Default for Config {
@@ -28,8 +33,31 @@ impl Default for Config {
     }
 }
 
-fn main() {
-    let options = Options::from_args();
+fn main() -> Result<(), Box<dyn Error>> {
+    let clap_matches = Options::clap().get_matches();
+    let options = Options::from_clap(&clap_matches);
+    
+    let mut config = get_config(&options)?;
+    
+    clap_matches.value_of("database_path")
+        .map(|x| config.database_path = x.into());
+
     #[cfg(debug_assertions)]
     println!("{:?}", options);
+
+    Ok(())
 }
+
+/// 
+fn get_config(options: &Options) -> std::io::Result<Config> {
+    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
+        )
+    )
+}