Add the Config module (cleaner code)

src/config.rs

+#![allow(dead_code)]
+
+use ini::{Error::Io as IniErrIo, Error::Parse as IniErrParse, Ini};
+use url::Url;
+
+pub struct Config {
+    pub display_name: String,  // The display name to set for the bot
+    pub homeserver_url: Url,   // The url of the home server, like https://matrix.iiens.net
+    pub user_name: String,     // The true user name
+    pub user_password: String, // The true user name
+}
+
+pub fn from_file(file_name: &String) -> Result<Config, String> {
+    return match Ini::load_from_file(file_name) {
+        Err(IniErrIo(e)) => Err(e.to_string()),
+        Err(IniErrParse(e)) => Err(e.to_string()),
+        Ok(conf) => {
+            let hs_url_str = conf.get_from_or(Some("user"), "homeserver", "https://matrix.org");
+            return match Url::parse(hs_url_str) {
+                Err(e) => Err(e.to_string()),
+                Ok(hs_url) => Ok(Config {
+                    user_name: conf
+                        .get_from_or(Some("user"), "id", "@some-id:matrix.org")
+                        .to_string(),
+                    user_password: conf
+                        .get_from_or(Some("user"), "password", "no-password")
+                        .to_string(),
+                    display_name: conf
+                        .get_from_or(Some("user"), "display_name", "MGB-Hitagi")
+                        .to_string(),
+                    homeserver_url: hs_url,
+                }),
+            };
+        }
+    };
+}
+
+pub fn write_default(file_name: &String) -> Result<(), String> {
+    let mut conf = Ini::new();
+    conf.with_section(Some("user"))
+        .set("id", "@some_id:matrix.org")
+        .set("password", "no-password")
+        .set("display_name", "MGB-Hitagi");
+    return match conf.write_to_file_policy(file_name, ini::EscapePolicy::Everything) {
+        Ok(()) => Ok(()),
+        Err(e) => Err(e.to_string()),
+    };
+}