Slightly improve error messages if files fail to open or read

Author: zofrex

src/config.rs

@@ -17,9 +17,9 @@ struct ConfigFile {
 
 impl Config {
     pub fn from_file<P: AsRef<Path>>(path: P) -> Config {
-        let mut file = File::open(path).unwrap();
+        let mut file = File::open(path).expect("Opening config file");
         let mut contents = String::new();
-        file.read_to_string(&mut contents).unwrap();
+        file.read_to_string(&mut contents).expect("Reading config file");
         let config: ConfigFile = toml::from_str(&contents).unwrap();
         let socket_mode = config.socket_mode.map(|m| u32::from_str_radix(&m, 8).unwrap());
         Config {

src/main.rs

@@ -218,7 +218,7 @@ fn main() {
     hbse.add(Box::new(DirectorySource::new("/usr/share/better-than-basic/templates", ".hbs")));
 
     if let Err(r) = hbse.reload() {
-        panic!("{}", r);
+        panic!("Error loading templates: {}", r);
     }
 
     let mut router = Router::new();

src/users.rs

@@ -32,9 +32,9 @@ pub enum LoginResult {
 
 impl Users {
     pub fn from_file<P: AsRef<Path>>(path: P) -> Users {
-        let mut file = File::open(path).unwrap();
+        let mut file = File::open(path).expect("Opening users file");
         let mut contents = String::new();
-        file.read_to_string(&mut contents).unwrap();
+        file.read_to_string(&mut contents).expect("Reading users file");
         let users_table = contents.parse::<Value>().unwrap();
         let users = users_table.as_table()
             .unwrap()