Improve error handling

src/main.rs

@@ -1,9 +1,11 @@
-use std::{io::Read, path::PathBuf};
+use std::io::Read;
+use std::path::PathBuf;
 
 use clap::Parser;
-use color_eyre::Report;
+use color_eyre::{eyre::WrapErr, Result};
 use serde_json::json;
-use tracing::{debug, error};
+use std::fmt::Display;
+use tracing::debug;
 use tracing_subscriber::EnvFilter;
 
 /// Bert
@@ -46,13 +48,18 @@ enum Command {
     /// Lower volume
     VolumeDown,
 }
-fn main() {
+
-    if let Err(e) = do_main() {
+impl Display for Command {
-        error!("Fatal error: {}", e);
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Command::PlayPause => write!(f, "Play/Pause"),
+            Command::VolumeUp => write!(f, "Volume Up"),
+            Command::VolumeDown => write!(f, "Volume Down"),
+        }
     }
 }
 
-fn do_main() -> Result<(), Box<dyn std::error::Error>> {
+fn main() -> Result<()> {
     let opts = Opts::parse();
 
     let Opts {
@@ -65,7 +72,7 @@ fn do_main() -> Result<(), Box<dyn std::error::Error>> {
         token_file,
     } = opts;
 
-    setup(debug)?;
+    setup(debug).wrap_err("Setup failed")?;
 
     let token = if let Some(token) = token {
         Some(token)
@@ -84,16 +91,18 @@ fn do_main() -> Result<(), Box<dyn std::error::Error>> {
 
     if let Some(token) = token {
         if let Some(cmd) = cmd {
-            call_service(cmd, host, entity, insecure, token)?;
+            call_service(cmd, host, entity, insecure, token)
+                .wrap_err_with(|| format!("Unable to execute command {cmd}"))?;
         } else {
-            get_now_playing(host, entity, insecure, token)?;
+            get_now_playing(host, entity, insecure, token)
+                .wrap_err("Unable to retrieve now playing info")?;
         }
     }
     // println!("{:#?}", response);
     Ok(())
 }
 
-fn setup(debug: bool) -> Result<(), Report> {
+fn setup(debug: bool) -> Result<()> {
     if debug {
         std::env::set_var("RUST_LOG", "debug");
     }
@@ -106,12 +115,7 @@ fn setup(debug: bool) -> Result<(), Report> {
     Ok(())
 }
 
-fn get_now_playing(
+fn get_now_playing(host: String, entity: String, insecure: bool, token: String) -> Result<()> {
-    host: String,
-    entity: String,
-    insecure: bool,
-    token: String,
-) -> Result<(), Box<dyn std::error::Error>> {
     let url = format!(
         "{}://{}/api/states/{}",
         if insecure { "http" } else { "https" },
@@ -174,7 +178,7 @@ fn call_service(
     entity: String,
     insecure: bool,
     token: String,
-) -> Result<(), Box<dyn std::error::Error>> {
+) -> Result<()> {
     let cmd = match command {
         Command::PlayPause => "media_play_pause",
         Command::VolumeUp => "volume_up",