Better error reporting

2 files changed, 26 insertions, 13 deletions

diff --git a/src/main.rs b/src/main.rs
index 8edc760..310fa1a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -19,7 +19,7 @@ mod utils;
 use utils::*;
 
 use dbus_api::sink::OrgPulseAudioExtEqualizing1Equalizer;
-use failure::Error;
+use failure::{Error, ResultExt};
 use structopt::StructOpt;
 
 use std::fs::File;
@@ -115,6 +115,9 @@ fn main() {
         Ok(()) => (),
         Err(err) => {
             eprintln!("Error: {}", err);
+            for cause in err.iter_causes() {
+                eprintln!("     : {}", cause);
+            }
             std::process::exit(-1);
         }
     }
@@ -133,8 +136,12 @@ fn start() -> Result<(), Error> {
 }
 
 fn reset(args: ResetCli) -> Result<(), Error> {
-    let conn = connect()?;
-    let conn_sink = get_equalized_sink(&conn)?;
+    let conn = connect().context(
+        "Could not connect to PulseAudio's D-Bus socket. Have you loaded the 'module-dbus-protocol' module?"
+    )?;
+    let conn_sink = get_equalized_sink(&conn).context(
+        "Could not find an equalized sink. Have you loaded the 'module-equalizer-sink' module?",
+    )?;
     let filter_rate = conn_sink.get_filter_sample_rate()?;
     let filter = Filter {
         preamp: 1f64,
@@ -148,8 +155,12 @@ fn reset(args: ResetCli) -> Result<(), Error> {
 }
 
 fn load(args: LoadCli) -> Result<(), Error> {
-    let conn = connect()?;
-    let conn_sink = get_equalized_sink(&conn)?;
+    let conn = connect().context(
+        "Could not connect to PulseAudio's D-Bus socket. Have you loaded the 'module-dbus-protocol' module?"
+    )?;
+    let conn_sink = get_equalized_sink(&conn).context(
+        "Could not find an equalized sink. Have you loaded the 'module-equalizer-sink' module?",
+    )?;
 
     let filter = if args.file == "-" {
         let stdin = io::stdin();
diff --git a/src/utils.rs b/src/utils.rs
index 66ccae4..24af366 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -1,19 +1,18 @@
-use ::{Filter, NoEqualizedSink};
+use {Filter, NoEqualizedSink};
 
 use parsing::EqualizerApoParser;
 
-use ::dbus_api::equalizing_manager::OrgPulseAudioExtEqualizing1Manager;
-use ::dbus_api::server_lookup::OrgPulseAudioServerLookup1;
-use ::dbus_api::sink::OrgPulseAudioExtEqualizing1Equalizer;
+use dbus_api::equalizing_manager::OrgPulseAudioExtEqualizing1Manager;
+use dbus_api::server_lookup::OrgPulseAudioServerLookup1;
+use dbus_api::sink::OrgPulseAudioExtEqualizing1Equalizer;
 
-use dbus::{BusType, Connection, ConnPath};
+use dbus::{BusType, ConnPath, Connection};
 use failure::{Error, ResultExt};
 
 use std::io;
 
 pub fn connect() -> Result<Connection, Error> {
-    let pulse_sock_path =
-        get_pulse_dbus_sock().context("While looking up PulseAudio's D-Bus socket path")?;
+    let pulse_sock_path = get_pulse_dbus_sock()?;
     info!("PulseAudio's D-Bus socket path is: {}", pulse_sock_path);
 
     trace!("Connecting to PulseAudio's D-Bus socket");
@@ -46,7 +45,10 @@ pub fn send_filter(conn_sink: &ConnPath<&Connection>, filter: Filter) -> Result<
     Ok(())
 }
 
-pub fn read_filter<T>(file: &mut T) -> Result<Filter, Error> where T: io::Read {
+pub fn read_filter<T>(file: &mut T) -> Result<Filter, Error>
+where
+    T: io::Read,
+{
     let mut buffer = String::new();
 
     info!("Reading filter in GraphicEQ format from the command line");