Initial commit.

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

src/run_modes.rs

@@ -0,0 +1,61 @@
+use crate::{Opt, RunMode};
+use crate::result::{AppResult, AppError};
+use crate::initialization::init_config;
+use crate::config::{update_episode, update_config, Config};
+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(options) => {
+            update_config(options)
+        }
+    }
+}
+
+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.")
+        ))
+    }
+}
+
+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.")
+        ))
+    }
+}
+
+pub fn play() -> AppResult<()> {
+    let conf = Config::read()?;
+    let mut episode = conf.get_current_episode()?;
+    while !episode.is_empty() {
+        let mut child = Command::new("sh")
+            .arg("-c")
+            .arg(conf.command.replace("{}", episode.as_str()))
+            .spawn()?;
+        child.wait()?;
+        update_episode(next_episode)?;
+        episode = conf.get_current_episode()?;
+    }
+    Ok(())
+}