test

src/loaders/sources.rs

@@ -54,3 +54,26 @@ pub fn load_sources(path: &str) -> io::Result<Vec<AptSource>> {
 
     Ok(sources)
 }
+
+use std::fs;
+use std::error::Error;
+use serde::Serialize;
+
+/// Save sources into a TOML file with a top-level `repositories` array-of-tables
+pub fn save_sources_to_toml(sources: &[AptSource], path: &str) -> Result<(), Box<dyn Error>> {
+    // tiny wrapper so toml serializes into:
+    // [[repositories]]
+    // ...
+    #[derive(Serialize)]
+    struct Repos<'a> {
+        repositories: &'a [AptSource],
+    }
+
+    let wrapper = Repos { repositories: sources };
+
+    let toml_string = toml::to_string_pretty(&wrapper)?;
+    fs::write(path, toml_string)?;
+
+    Ok(())
+}
+

src/main.rs

@@ -1,12 +1,12 @@
-mod loaders;
 mod structs;
+mod loaders;
 
-use crate::loaders::sources::load_sources;
+use crate::loaders::sources::{load_sources, save_sources_to_toml};
 
-fn main() -> std::io::Result<()> {
+fn main() -> Result<(), Box<dyn std::error::Error>> {
     let sources = load_sources("/etc/apt/sources.list")?;
-    for source in sources {
-        println!("{:?}", source);
-    }
+    save_sources_to_toml(&sources, "sources.toml")?;
+    println!("Saved sources to sources.toml");
     Ok(())
 }
+