feat: load settings from a configuration file

Co-authored-by: aider (gemini/gemini-2.5-pro-preview-05-06) <aider@aider.chat>

Cargo.toml

@@ -8,5 +8,8 @@ edition = "2021"
 [dependencies]
 anyhow = "1.0.82"
 clap = { version = "4.5.4", features = ["derive"] }
+config = "0.14.0"
+dirs = "5.0.1"
 fs_extra = "1.3.0"
+serde = { version = "1.0", features = ["derive"] }
 tempfile = "3.10.1"

src/main.rs

@@ -1,15 +1,18 @@
 use anyhow::{Context, Result};
 use clap::Parser;
+use serde::Deserialize;
 use std::fs;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 use std::process::Command;
 use tempfile::TempDir;
 
-// ==== CONFIGURATION ====
-const NAS_HOST: &str = "(localaddress)";
-const NAS_USER: &str = "ssh_user";
-const NAS_PATH: &str = "/path/to/files/on/nas";
-const COOKIES_FILE: &str = "/location/of/apple-music-cookies-file.txt";
+#[derive(Debug, Deserialize)]
+struct Settings {
+    nas_host: String,
+    nas_user: String,
+    nas_path: String,
+    cookies_file: String,
+}
 
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
@@ -22,6 +25,22 @@ struct Args {
 fn main() -> Result<()> {
     let args = Args::parse();
 
+    let config_path = dirs::config_dir()
+        .context("Could not find config directory")?
+        .join("jamdl/config.toml");
+
+    if !config_path.exists() {
+        anyhow::bail!(
+            "Config file not found. Please create it at: {}",
+            config_path.display()
+        );
+    }
+
+    let settings = config::Config::builder()
+        .add_source(config::File::from(config_path))
+        .build()?
+        .try_deserialize::<Settings>()?;
+
     // Create temp directory
     let temp_dir = TempDir::new().context("Failed to create temporary directory")?;
     let temp_path = temp_dir.path();
@@ -30,26 +49,26 @@ fn main() -> Result<()> {
         temp_path.display()
     );
 
-    download_media(&args.url, temp_path)?;
-    transfer_files(temp_path)?;
+    download_media(&args.url, temp_path, &settings)?;
+    transfer_files(temp_path, &settings)?;
 
     // Cleanup is handled by TempDir's Drop trait
     println!("[INFO] Cleaning up...");
     Ok(())
 }
 
-fn download_media(video_url: &str, download_path: &Path) -> Result<()> {
+fn download_media(video_url: &str, download_path: &Path, settings: &Settings) -> Result<()> {
     let mut cmd: Command;
 
     if video_url.contains("music.apple.com") {
         println!("[INFO] Apple Music link detected. Using gamdl...");
         cmd = Command::new("gamdl");
-        if Path::new(COOKIES_FILE).exists() {
-            cmd.args(["--cookies-path", COOKIES_FILE, video_url]);
+        if Path::new(&settings.cookies_file).exists() {
+            cmd.args(["--cookies-path", &settings.cookies_file, video_url]);
         } else {
             println!(
                 "[WARN] cookies.txt not found at {} — running gamdl without it",
-                COOKIES_FILE
+                settings.cookies_file
             );
             cmd.arg(video_url);
         }
@@ -75,15 +94,15 @@ fn download_media(video_url: &str, download_path: &Path) -> Result<()> {
     Ok(())
 }
 
-fn transfer_files(source_path: &Path) -> Result<()> {
+fn transfer_files(source_path: &Path, settings: &Settings) -> Result<()> {
     let is_empty = fs::read_dir(source_path)?.next().is_none();
 
     if !is_empty {
-        if NAS_HOST == "localhost" {
+        if settings.nas_host == "localhost" {
             println!("[INFO] NAS_HOST is localhost, copying files locally...");
             let mut options = fs_extra::dir::CopyOptions::new();
             options.content_only = true;
-            fs_extra::dir::copy(source_path, NAS_PATH, &options)
+            fs_extra::dir::copy(source_path, &settings.nas_path, &options)
                 .context("Failed to copy files locally")?;
         } else {
             println!("[INFO] Transferring files to NAS via scp...");
@@ -92,7 +111,10 @@ fn transfer_files(source_path: &Path) -> Result<()> {
                 "{}/.",
                 source_path.to_str().context("Invalid source path")?
             );
-            let destination = format!("{}@{}:{}", NAS_USER, NAS_HOST, NAS_PATH);
+            let destination = format!(
+                "{}@{}:{}",
+                settings.nas_user, settings.nas_host, settings.nas_path
+            );
             scp_cmd.args(["-r", &source, &destination]);
 
             let status = scp_cmd.status().context("Failed to execute scp")?;