From 6a69bbf736966c493cead716026db92c5b44962a Mon Sep 17 00:00:00 2001
From: Robin Krahl <robin.krahl@ireas.org>
Date: Thu, 27 Dec 2018 17:27:08 +0100
Subject: Implement the pws clear subcommand

This patch implements the pws clear command which allows the user to
clear a slot in the password safe.
---
 nitrocli/src/args.rs     | 22 +++++++++++++++++++++-
 nitrocli/src/commands.rs |  9 +++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/nitrocli/src/args.rs b/nitrocli/src/args.rs
index 9982d0f..28ccb1f 100644
--- a/nitrocli/src/args.rs
+++ b/nitrocli/src/args.rs
@@ -326,6 +326,7 @@ impl str::FromStr for PinCommand {
 
 #[derive(Debug)]
 enum PwsCommand {
+  Clear,
   Get,
   Set,
 }
@@ -333,6 +334,7 @@ enum PwsCommand {
 impl PwsCommand {
   fn execute(&self, args: Vec<String>) -> Result<()> {
     match *self {
+      PwsCommand::Clear => pws_clear(args),
       PwsCommand::Get => pws_get(args),
       PwsCommand::Set => pws_set(args),
     }
@@ -345,6 +347,7 @@ impl fmt::Display for PwsCommand {
       f,
       "{}",
       match *self {
+        PwsCommand::Clear => "clear",
         PwsCommand::Get => "get",
         PwsCommand::Set => "set",
       }
@@ -357,6 +360,7 @@ impl str::FromStr for PwsCommand {
 
   fn from_str(s: &str) -> result::Result<Self, Self::Err> {
     match s {
+      "clear" => Ok(PwsCommand::Clear),
       "get" => Ok(PwsCommand::Get),
       "set" => Ok(PwsCommand::Set),
       _ => Err(()),
@@ -800,7 +804,7 @@ fn pws(args: Vec<String>) -> Result<()> {
   let _ = parser.refer(&mut subcommand).required().add_argument(
     "subcommand",
     argparse::Store,
-    "The subcommand to execute (get|set)",
+    "The subcommand to execute (clear|get|set)",
   );
   let _ = parser.refer(&mut subargs).add_argument(
     "arguments",
@@ -889,6 +893,22 @@ fn pws_set(args: Vec<String>) -> Result<()> {
   commands::pws_set(slot, &name, &login, &password)
 }
 
+/// Clear a PWS slot.
+fn pws_clear(args: Vec<String>) -> Result<()> {
+  let mut slot: u8 = 0;
+  let mut parser = argparse::ArgumentParser::new();
+  parser.set_description("Clears a password safe slot");
+  let _ = parser.refer(&mut slot).required().add_argument(
+    "slot",
+    argparse::Store,
+    "The PWS slot to clear",
+  );
+  parse(&parser, args)?;
+  drop(parser);
+
+  commands::pws_clear(slot)
+}
+
 /// Parse the command-line arguments and return the selected command and
 /// the remaining arguments for the command.
 fn parse_arguments(args: Vec<String>) -> Result<(Command, Vec<String>)> {
diff --git a/nitrocli/src/commands.rs b/nitrocli/src/commands.rs
index e1c88c8..4deb1a7 100644
--- a/nitrocli/src/commands.rs
+++ b/nitrocli/src/commands.rs
@@ -593,6 +593,15 @@ pub fn pws_set(slot: u8, name: &str, login: &str, password: &str) -> Result<()>
     .map_err(|err| get_error("Could not write PWS slot", &err))
 }
 
+/// Clear a PWS slot.
+pub fn pws_clear(slot: u8) -> Result<()> {
+  let device = get_device()?;
+  let pws = get_password_safe(&device)?;
+  pws
+    .erase_slot(slot)
+    .map_err(|err| get_error("Could not clear PWS slot", &err))
+}
+
 #[cfg(test)]
 mod tests {
   use super::*;
-- 
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