Remove unused code after structopt transition

In the previous patches, we replaced argparse with structopt and removed
the argparse dependency.  This patch removes the code that was only
needed for argparse.

1 files changed, 29 insertions, 61 deletions

diff --git a/src/args.rs b/src/args.rs
index b31ed8e..82140f3 100644
--- a/src/args.rs
+++ b/src/args.rs
@@ -29,38 +29,6 @@ use crate::RunCtx;
 
 type Result<T> = result::Result<T, Error>;
 
-/// Wraps a writer and buffers its output.
-///
-/// This implementation is similar to `io::BufWriter`, but:
-/// - The inner writer is only written to if `flush` is called.
-/// - The buffer may grow infinitely large.
-struct BufWriter<'w, W: io::Write + ?Sized> {
-  buf: Vec<u8>,
-  inner: &'w mut W,
-}
-
-impl<'w, W: io::Write + ?Sized> BufWriter<'w, W> {
-  pub fn new(inner: &'w mut W) -> Self {
-    BufWriter {
-      buf: Vec::with_capacity(128),
-      inner,
-    }
-  }
-}
-
-impl<'w, W: io::Write + ?Sized> io::Write for BufWriter<'w, W> {
-  fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-    self.buf.extend_from_slice(buf);
-    Ok(buf.len())
-  }
-
-  fn flush(&mut self) -> io::Result<()> {
-    self.inner.write_all(&self.buf)?;
-    self.buf.clear();
-    self.inner.flush()
-  }
-}
-
 trait Stdio {
   fn stdio(&mut self) -> (&mut dyn io::Write, &mut dyn io::Write);
 }
@@ -156,18 +124,18 @@ Command! {Command, [
 ]}
 
 /// Reads or writes the device configuration
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct ConfigArgs {
   #[structopt(subcommand)]
   subcmd: ConfigCommand,
 }
 
 /// Prints the Nitrokey configuration
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct ConfigGetArgs {}
 
 /// Changes the Nitrokey configuration
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct ConfigSetArgs {
   /// Sets the numlock option to the given HOTP slot
   #[structopt(short = "n", long)]
@@ -196,33 +164,33 @@ pub struct ConfigSetArgs {
 }
 
 /// Interacts with the device's encrypted volume
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct EncryptedArgs {
   #[structopt(subcommand)]
   subcmd: EncryptedCommand,
 }
 
 /// Closes the encrypted volume on a Nitrokey Storage
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct EncryptedCloseArgs {}
 
 /// Opens the encrypted volume on a Nitrokey Storage
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct EncryptedOpenArgs {}
 
 /// Interacts with the device's hidden volume
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct HiddenArgs {
   #[structopt(subcommand)]
   subcmd: HiddenCommand,
 }
 
 /// Closes the hidden volume on a Nitrokey Storage
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct HiddenCloseArgs {}
 
 /// Creates a hidden volume on a Nitrokey Storage
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct HiddenCreateArgs {
   /// The hidden volume slot to use
   slot: u8,
@@ -233,22 +201,22 @@ pub struct HiddenCreateArgs {
 }
 
 /// Opens the hidden volume on a Nitrokey Storage
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct HiddenOpenArgs {}
 
 /// Locks the connected Nitrokey device
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct LockArgs {}
 
 /// Accesses one-time passwords
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct OtpArgs {
   #[structopt(subcommand)]
   subcmd: OtpCommand,
 }
 
 /// Clears a one-time password slot
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct OtpClearArgs {
   /// The OTP algorithm to use
   #[structopt(short, long, default_value = "totp")]
@@ -258,7 +226,7 @@ pub struct OtpClearArgs {
 }
 
 /// Generates a one-time password
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct OtpGetArgs {
   /// The OTP algorithm to use
   #[structopt(short, long, default_value = "totp")]
@@ -271,7 +239,7 @@ pub struct OtpGetArgs {
 }
 
 /// Configures a one-time password slot
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct OtpSetArgs {
   /// The OTP algorithm to use
   #[structopt(short, long, default_value = "totp")]
@@ -298,7 +266,7 @@ pub struct OtpSetArgs {
 }
 
 /// Prints the status of the one-time password slots
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct OtpStatusArgs {
   /// Shows slots that are not programmed
   #[structopt(short, long)]
@@ -306,18 +274,18 @@ pub struct OtpStatusArgs {
 }
 
 /// Manages the Nitrokey PINs
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct PinArgs {
   #[structopt(subcommand)]
   subcmd: PinCommand,
 }
 
 /// Clears the cached PINs
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct PinClearArgs {}
 
 /// Changes a PIN
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct PinSetArgs {
   /// The PIN type to change
   #[structopt(name = "type")]
@@ -325,25 +293,25 @@ pub struct PinSetArgs {
 }
 
 /// Unblocks and resets the user PIN
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct PinUnblockArgs {}
 
 /// Accesses the password safe
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct PwsArgs {
   #[structopt(subcommand)]
   subcmd: PwsCommand,
 }
 
 /// Clears a password safe slot
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct PwsClearArgs {
   /// The PWS slot to clear
   slot: u8,
 }
 
 /// Reads a password safe slot
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct PwsGetArgs {
   /// Shows the name stored on the slot
   #[structopt(short, long)]
@@ -362,7 +330,7 @@ pub struct PwsGetArgs {
 }
 
 /// Writes a password safe slot
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct PwsSetArgs {
   /// The PWS slot to write
   slot: u8,
@@ -375,7 +343,7 @@ pub struct PwsSetArgs {
 }
 
 /// Prints the status of the password safe slots
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct PwsStatusArgs {
   /// Shows slots that are not programmed
   #[structopt(short, long)]
@@ -383,22 +351,22 @@ pub struct PwsStatusArgs {
 }
 
 /// Performs a factory reset
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct ResetArgs {}
 
 /// Prints the status of the connected Nitrokey device
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct StatusArgs {}
 
 /// Interacts with the device's unencrypted volume
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct UnencryptedArgs {
   #[structopt(subcommand)]
   subcmd: UnencryptedCommand,
 }
 
 /// Changes the configuration of the unencrypted volume on a Nitrokey Storage
-#[derive(Debug, Default, PartialEq, structopt::StructOpt)]
+#[derive(Debug, PartialEq, structopt::StructOpt)]
 pub struct UnencryptedSetArgs {
   /// The mode to change to
   #[structopt(name = "type")]