Implement the add command

src/config.rs

@@ -7,16 +7,28 @@ use std::path::Path;
 #[derive(Debug, Serialize, Deserialize)]
 /// The internal representation of the configuration file.
 pub struct Config {
+    #[serde(skip)] // Skip serializing the configration file location
+    config_location: String,
     pub source_dir: String,
-    repositories: Vec<Repository>,
+    pub repositories: Vec<Repository>,
 }
 
 #[derive(Debug, Serialize, Deserialize)]
-struct Repository {
+/// The internal representation of a single repository
+pub struct Repository {
     name: String,
     url: String,
 }
 
+impl Repository {
+    pub fn new(url: String) -> Repository {
+        Repository {
+            name: url.clone(),
+            url,
+        }
+    }
+}
+
 impl Config {
     /// Create new Config struct with default values
     ///
@@ -25,12 +37,13 @@ impl Config {
         Config {
             source_dir: format!("{}/sources", env::var("HOME").unwrap()),
             repositories: vec![],
+            config_location: String::new(),
         }
     }
 
     /// Read TOML file and load values into a Config struct
     ///
-    /// If the filename doesn't exist, read_config() will write the current struct to the given
+    /// If the filename doesn't exist, `read_config()` will write the current struct to the given
     /// config file.
     pub fn read_config(&mut self, filename: &str) -> Result<(), Box<dyn Error>> {
         // Load raw yaml file. If the file doesn't exist, create it
@@ -51,6 +64,15 @@ impl Config {
             // Write default Config struct to file
             fs::write(filename, config).expect("Couldn't write file");
         }
+        self.config_location = filename.to_string();
+        Ok(())
+    }
+
+    /// Save the current configuration to a file.
+    ///
+    /// This has to be called after `read_config()`.
+    pub fn save_config(&self) -> Result<(), Box<dyn Error>> {
+        fs::write(&self.config_location, toml::to_string(&self)?)?;
         Ok(())
     }
 

src/lib.rs

@@ -1,5 +1,5 @@
 pub mod config;
-use config::Config;
+use config::{Config, Repository};
 use std::error::Error;
 use std::env;
 
@@ -17,7 +17,7 @@ pub struct State {
 #[derive(Debug)]
 /// Used to signal which main command is going to be run
 enum Cmd {
-    Fetch,
+    Add,
     Help,
     DumpConfig,
 }
@@ -68,13 +68,13 @@ impl State {
                     }
                 }
             }
-            // Fetch command
-            else if x == "fetch" {
+            // add command
+            else if x == "add" {
                 let url = args.next();
                 match url {
                     Some(x) => match state.cmd {
                         None => {
-                            state.cmd = Some(Cmd::Fetch);
+                            state.cmd = Some(Cmd::Add);
                             state.url = Some(x);
                         }
                         _ => {}
@@ -96,7 +96,8 @@ impl State {
     }
 }
 
-pub fn run(state: State, config: Config) -> Result<(), Box<dyn Error>> {
+#[allow(unreachable_patterns)]
+pub fn run(state: State, mut config: Config) -> Result<(), Box<dyn Error>> {
     match state.cmd {
         Some(Cmd::Help) => {
             println!("{}", help_msg());
@@ -104,6 +105,13 @@ pub fn run(state: State, config: Config) -> Result<(), Box<dyn Error>> {
         Some(Cmd::DumpConfig) => {
             println!("{}", config.to_string().unwrap());
         }
+        Some(Cmd::Add) => {
+            config.repositories.push(Repository::new(match state.url {
+                Some(x) => x,
+                None => String::new(),
+            }));
+            config.save_config()?;
+        }
         Some(x) => {
             println!("{:?} hasn't been implemented yet!", x)
         }