add some more context to some errors

Some error messages currently look very weird. For example, if the given
configuration file does not exist, it gives you an error about a missing
file - which could also be the file to upload though, as the error
doesn't specify. Therefore, some more context for the error messages is
nice.

The "sourceback" could still use some work.

1 files changed, 12 insertions, 5 deletions

diff --git a/src/main.rs b/src/main.rs
index f7f4bac..f2fa2ec 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -6,7 +6,7 @@ use std::{
     time::Duration,
 };
 
-use anyhow::{anyhow, Result};
+use anyhow::{anyhow, Context, Result};
 use clap::Clap;
 use evtclib::{Boss, Compression, Log};
 use log::{debug, error, info, warn};
@@ -62,12 +62,15 @@ fn main() {
     let opts = Opts::parse();
     if let Err(e) = inner_main(&opts) {
         error!("{}", e);
+        e.chain()
+            .skip(1)
+            .for_each(|cause| error!("... because: {}", cause));
         std::process::exit(1);
     }
 }
 
 fn inner_main(opts: &Opts) -> Result<()> {
-    let config = config::load(&opts.config)?;
+    let config = config::load(&opts.config).context("Could not load configuration")?;
     match &opts.subcmd {
         SubCommand::Watch(w) => watch(w, &config)?,
         SubCommand::Upload(u) => {
@@ -75,7 +78,8 @@ fn inner_main(opts: &Opts) -> Result<()> {
             println!("{}", permalink);
             if let Some(d) = &config.discord {
                 let log = load_log(&u.path)?;
-                discord::post_link(&d.auth_token, d.channel_id, log, permalink)?;
+                discord::post_link(&d.auth_token, d.channel_id, log, permalink)
+                    .context("Could not post link to Discord")?;
             }
         }
     }
@@ -88,7 +92,9 @@ fn watch(watch: &Watch, config: &Config) -> Result<()> {
 
     let (tx, rx) = channel();
     let mut watcher = notify::watcher(tx, Duration::from_secs(WATCH_DELAY_SECONDS))?;
-    watcher.watch(&watch.dirname, RecursiveMode::Recursive)?;
+    watcher
+        .watch(&watch.dirname, RecursiveMode::Recursive)
+        .context("Could not watch the given directory")?;
     info!("Watcher set up, watching {:?}", watch.dirname);
     loop {
         let event = rx.recv()?;
@@ -159,7 +165,8 @@ fn handle_file(config: &Config, filename: &Path) -> Result<()> {
     info!("Uploaded log, available at {}", permalink);
 
     if let Some(d) = &config.discord {
-        discord::post_link(&d.auth_token, d.channel_id, log, permalink)?;
+        discord::post_link(&d.auth_token, d.channel_id, log, permalink)
+            .context("Could not post link to Discord")?;
         info!("Posted link to Discord");
     }