Added autcompletions.

Description:
- Added autocompletions for some shells.
- Fixed styles.
- Fixed possible bugs with clippy.

Signed-off-by: Pavel Kirilin <win10@list.ru>

src/run_modes.rs

@@ -1,30 +1,19 @@
-use crate::{Opt, RunMode};
-use crate::result::{AppResult, AppError};
+use crate::config::{update_config, update_episode, Config};
 use crate::initialization::init_config;
-use crate::config::{update_episode, update_config, Config};
+use crate::result::{AppError, AppResult};
+use crate::{generate_completion, Opt, RunMode};
 use std::process::Command;
 
 pub fn run(opts: Opt) -> AppResult<()> {
     let mode = opts.mode.unwrap_or_else(|| RunMode::Play);
     match mode {
-        RunMode::Init => {
-            init_config()
-        }
-        RunMode::Play => {
-            play()
-        }
-        RunMode::Prev => {
-            update_episode(prev_episode)
-        }
-        RunMode::Next => {
-            update_episode(next_episode)
-        }
-        RunMode::Update => {
-            update_config()
-        }
-        RunMode::Reset => {
-            update_episode(|_| { Ok(0) })
-        }
+        RunMode::Init => init_config(),
+        RunMode::Play => play(),
+        RunMode::Prev => update_episode(prev_episode),
+        RunMode::Next => update_episode(next_episode),
+        RunMode::Update => update_config(),
+        RunMode::Reset => update_episode(|_| Ok(0)),
+        RunMode::Completion { shell } => generate_completion(shell),
     }
 }
 
@@ -32,9 +21,9 @@ pub fn prev_episode(current: usize) -> AppResult<usize> {
     if let Some(episode) = current.checked_sub(1) {
         Ok(episode)
     } else {
-        Err(AppError::RuntimeError(
-            String::from("Episode can't be less than zero.")
-        ))
+        Err(AppError::RuntimeError(String::from(
+            "Episode can't be less than zero.",
+        )))
     }
 }
 
@@ -42,9 +31,9 @@ pub fn next_episode(current: usize) -> AppResult<usize> {
     if let Some(episode) = current.checked_add(1) {
         Ok(episode)
     } else {
-        Err(AppError::RuntimeError(
-            String::from("Reached usize limit. Sorry.")
-        ))
+        Err(AppError::RuntimeError(String::from(
+            "Reached usize limit. Sorry.",
+        )))
     }
 }
 
@@ -58,7 +47,8 @@ fn add_leading_zero(n: usize) -> String {
 
 fn prepare_command(conf: Config) -> AppResult<String> {
     let index = conf.current_episode_count;
-    Ok(conf.command
+    Ok(conf
+        .command
         .replace("{}", conf.get_current_episode()?.as_str())
         .replace("{n}", format!("{}", index).as_str())
         .replace("{n+}", format!("{}", index + 1).as_str())
@@ -80,4 +70,4 @@ pub fn play() -> AppResult<()> {
         episode = conf.get_current_episode()?;
     }
     Ok(())
-}
+}