cli: add status command

Provides equivalent functionality to `yubico-piv-tool`

cli/src/commands/readers.rs

@@ -1,8 +1,13 @@
 //! List detected readers
 
+use crate::terminal::STDOUT;
 use gumdrop::Options;
-use std::process::exit;
-use yubikey_piv::readers::Readers;
+use std::{
+    io::{self, Write},
+    process::exit,
+};
+use termcolor::{ColorSpec, StandardStreamLock, WriteColor};
+use yubikey_piv::{Readers, Serial};
 
 /// The `readers` subcommand
 #[derive(Debug, Options)]
@@ -26,6 +31,9 @@ impl ReadersCmd {
             exit(1);
         }
 
+        let mut s = STDOUT.lock();
+        s.reset().unwrap();
+
         for (i, reader) in readers_iter.enumerate() {
             let name = reader.name();
             let mut yubikey = match reader.open() {
@@ -34,7 +42,23 @@ impl ReadersCmd {
             };
 
             let serial = yubikey.serial();
-            println!("{}: {} (serial: {})", i + 1, name, serial);
+            self.print_reader(&mut s, i + 1, &name, serial).unwrap();
         }
     }
+
+    /// Print a reader
+    fn print_reader(
+        &self,
+        stream: &mut StandardStreamLock<'_>,
+        index: usize,
+        name: &str,
+        serial: Serial,
+    ) -> Result<(), io::Error> {
+        stream.set_color(ColorSpec::new().set_bold(true))?;
+        write!(stream, "{:>3}:", index)?;
+        stream.reset()?;
+        writeln!(stream, " {} (serial: {})", name, serial)?;
+        stream.flush()?;
+        Ok(())
+    }
 }