Allow config to be updated with CLI args

src/config.rs

@@ -4,7 +4,9 @@ use cosmic::{
     cosmic_config::{self, cosmic_config_derive::CosmicConfigEntry, CosmicConfigEntry},
     theme,
 };
+use lexopt::prelude::*;
 use serde::{Deserialize, Serialize};
+use std::{path::PathBuf, process};
 
 use crate::wrappers::HWDeviceType;
 
@@ -41,3 +43,52 @@ impl Default for Config {
         }
     }
 }
+
+impl Config {
+    pub fn with_args(&mut self, args: &mut Args) {
+        if let Some(decoder) = args.decoder {
+            self.hw_decoder = decoder;
+        }
+    }
+}
+
+pub struct Args {
+    pub paths: Vec<PathBuf>,
+    pub decoder: Option<HWDeviceType>,
+}
+
+impl Args {
+    pub fn parse_args() -> Result<Self, lexopt::Error> {
+        let mut paths = Vec::new();
+        let mut decoder = None;
+
+        let mut parser = lexopt::Parser::from_env();
+        while let Some(arg) = parser.next()? {
+            match arg {
+                Long("list-hwdec") => {
+                    println!("Supported hardware decoders:");
+                    for hwdec in HWDeviceType::supported_devices() {
+                        println!("\t* [{}] {hwdec}", hwdec.short_name());
+                    }
+                    process::exit(0);
+                }
+                Long("hwdec") => {
+                    decoder = Some(parser.value()?.parse()?);
+                }
+                Value(path) => {
+                    let path = path.parse()?;
+                    paths.push(path);
+                }
+                _ => return Err(arg.unexpected()),
+            }
+        }
+
+        if paths.is_empty() {
+            return Err(lexopt::Error::MissingValue {
+                option: Some("missing video path".into()),
+            });
+        }
+
+        Ok(Self { paths, decoder })
+    }
+}