ravedude: Add option to print avrdude command

In case avrdude fails, it is nice to be able to see what command was
attempted.  Give the option to display it using --debug-avrdude.

ravedude/src/avrdude/mod.rs

@@ -51,6 +51,7 @@ impl Avrdude {
         options: &AvrdudeOptions,
         port: Option<impl AsRef<path::Path>>,
         bin: &path::Path,
+        debug: bool,
     ) -> anyhow::Result<Self> {
         let avrdude_version = Self::get_avrdude_version()?;
 
@@ -102,6 +103,19 @@ impl Avrdude {
 
         command = command.arg("-D").arg("-U").arg(flash_instruction);
 
+        if debug {
+            crate::task_message!(
+                "Dbg.Command",
+                "{} {}",
+                command.get_program().to_string_lossy(),
+                command
+                    .get_args()
+                    .map(|s| s.to_string_lossy())
+                    .collect::<Vec<_>>()
+                    .join(" ")
+            );
+        }
+
         let process = command.spawn().context("failed starting avrdude")?;
 
         Ok(Self { config, process })

ravedude/src/main.rs

@@ -48,6 +48,10 @@ struct Args {
     #[structopt(short = "d", long = "reset-delay")]
     reset_delay: Option<u64>,
 
+    /// Print the avrdude command that is executed for flashing the binary.
+    #[structopt(long = "debug-avrdude")]
+    debug_avrdude: bool,
+
     /// Which board to interact with.
     ///
     /// Must be one of the known board identifiers:
@@ -137,7 +141,12 @@ fn ravedude() -> anyhow::Result<()> {
             task_message!("Programming", "{}", bin.display(),);
         }
 
-        let mut avrdude = avrdude::Avrdude::run(&board.avrdude_options(), port.as_ref(), bin)?;
+        let mut avrdude = avrdude::Avrdude::run(
+            &board.avrdude_options(),
+            port.as_ref(),
+            bin,
+            args.debug_avrdude,
+        )?;
         avrdude.wait()?;
 
         task_message!("Programmed", "{}", bin.display());