feat: improve configuration file error handling

Cleans up the error messages generated when errors are encountered in
the configuration file. Instead of showing the raw error message, give
clear information about the problem.

src/commands.rs

@@ -6,7 +6,7 @@ use crate::application::UserData;
 use crate::command::{
     parse, Command, GotoMode, JumpMode, MoveAmount, MoveMode, SeekDirection, ShiftMode, TargetMode,
 };
-use crate::config::Config;
+use crate::config::{user_configuration_directory, Config};
 use crate::events::EventManager;
 use crate::ext_traits::CursiveExt;
 use crate::library::Library;
@@ -25,6 +25,7 @@ use cursive::traits::View;
 use cursive::views::Dialog;
 use cursive::Cursive;
 use log::{debug, error, info};
+use ncspot::CONFIGURATION_FILE_NAME;
 use std::cell::RefCell;
 
 pub enum CommandResult {
@@ -213,7 +214,17 @@ impl CommandManager {
                 Ok(None)
             }
             Command::ReloadConfig => {
-                self.config.reload();
+                self.config.reload().map_err(|_| {
+                    format!(
+                        "Failed to reload configuration. Fix errors in {} and try again.",
+                        user_configuration_directory()
+                            .map(|ref mut path| {
+                                path.push(CONFIGURATION_FILE_NAME);
+                                path.to_string_lossy().to_string()
+                            })
+                            .expect("configuration directory expected but not found")
+                    )
+                })?;
 
                 // update theme
                 let theme = self.config.build_theme();