refactor: optimize imports

Cargo.toml

@@ -9,3 +9,4 @@ edition = "2021"
 simple-log = "1.6.0"
 toml = "0.7.3"
 serde = { version = "1.0.162", features = ["derive"] }
+thiserror = "1.0.40"

src/configuration/mod.rs

@@ -1,9 +1,5 @@
-use std::error::Error;
-
 use serde::{Deserialize, Serialize};
 
-use crate::ffmpeg::FFmpegCommandOptions;
-
 mod ffmpeg;
 
 #[allow(non_camel_case_types)] // this is allowed cuz we want to use snake case in the config file

src/error.rs

@@ -0,0 +1,13 @@
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum Error {
+    #[error("Renice error: {0}")]
+    ReniceError(std::io::Error),
+
+    #[error("FFmpeg error: {0}")]
+    FFmpegError(std::io::Error),
+
+    #[error("Job error: {0}")]
+    JobError(std::io::Error),
+}

src/files.rs

@@ -1,5 +1,4 @@
 use std::path::PathBuf;
-use crate::configuration::Config;
 
 pub fn get_files<S: Into<String>>(path: S) -> Vec<PathBuf> {
     let mut files = Vec::new();

src/main.rs

@@ -3,7 +3,9 @@ extern crate simple_log;
 
 use std::env;
 use std::path::PathBuf;
+
 use simple_log::LogConfigBuilder;
+
 use renice::renice;
 use transcode::job::TranscodeJob;
 
@@ -12,6 +14,7 @@ mod files;
 mod ffmpeg;
 mod renice;
 mod transcode;
+mod error;
 
 fn main() {
     let config = configuration::Config::from_file(&env::var("CONFIG").unwrap_or(String::from("./config.toml")));

src/renice.rs

@@ -1,10 +1,19 @@
-use std::error::Error;
 use std::process::Command;
 
-pub fn renice(pid: u32, niceness: u8) -> Result<(), Box<dyn Error>> {
+use crate::error;
+
+pub fn renice(pid: u32, niceness: u8) -> Result<(), error::Error> {
     let mut command = Command::new("renice");
     command.arg(niceness.to_string());
     command.arg(pid.to_string());
-    command.spawn()?;
-    Ok(())
+    match command.output() {
+        Ok(output) => {
+            if output.status.success() {
+                Ok(())
+            } else {
+                Err(error::Error::ReniceError(std::io::Error::new(std::io::ErrorKind::Other, "renice failed")))
+            }
+        },
+        Err(e) => Err(error::Error::ReniceError(e))
+    }
 }

src/transcode/job.rs

@@ -1,6 +1,7 @@
-use std::path::PathBuf;
 use std::process::{Child, Command};
-use crate::configuration::{Config, ConfigFFmpeg};
+
+use crate::configuration::ConfigFFmpeg;
+use crate::error;
 
 pub struct TranscodeJob {
     pub input: String,
@@ -26,8 +27,11 @@ impl TranscodeJob {
         std::path::Path::new(&self.output).exists()
     }
 
-    pub fn run(&self, ffmpeg_config: &ConfigFFmpeg) -> Result<Child, std::io::Error> {
+    pub fn run(&self, ffmpeg_config: &ConfigFFmpeg) -> Result<Child, error::Error> {
         let mut command = self.build_command(ffmpeg_config);
-        command.spawn()
+        match command.spawn() {
+            Ok(child) => Ok(child),
+            Err(e) => Err(error::Error::JobError(e))
+        }
     }
 }