Refactor reading configuration file into a separate function

This allows for reusing it elsewhere (eg. for job configuration files)

src/conf.rs

@@ -22,36 +22,13 @@ impl Conf {
     }
 
     pub fn update_from_file(&mut self, path: &Path) {
-        let mut file = match std::fs::File::open(path) {
-            Err(why) => {
-                println!("Could not open file '{}': {}", path.display(), why); return;
-            },
-            Ok(file) => file,
+        let items = match read_conf_file(path) {
+            Err(_) => return,
+            Ok(items) => items,
         };
-        let mut content = String::new();
-        match file.read_to_string(&mut content) {
-            Err(why) => println!("Could not read from file '{}': {}", path.display(), why),
-            Ok(_) => (),
-        }
-
-        let lines = content.lines();
-        for line in lines {
-            if line.starts_with('#') {
-                continue;
-            }
-            let result = line.split_once('=');
-            if result.is_none() {
-                println!("Skipping configuration line '{}', no key-value delimiter (=) found", line);
-                continue;
-            }
-
-            let key = result.unwrap().0.trim();
-            let value = result.unwrap().1.trim();
-            if key.eq("") || value.eq("") {
-                println!("Skipping configuration line '{}', no key or value side is empty", line);
-                continue;
-            }
-
+        for item in items.iter() {
+            let key = item.0.as_str();
+            let value = item.1.as_str();
             match key {
                 "job_dir" => {
                     println!("{} changed from '{}' to '{}' by line in '{}'",
@@ -83,6 +60,46 @@ impl Conf {
     }
 }
 
+pub fn read_conf_file(path: &Path) -> Result<std::vec::Vec<(String, String)>, &str> {
+    let mut file = match std::fs::File::open(path) {
+        Err(why) => {
+            println!("Could not open file '{}': {}", path.display(), why);
+            return Err("Could not open file");
+        },
+        Ok(file) => file,
+    };
+    let mut content = String::new();
+    match file.read_to_string(&mut content) {
+        Err(why) => {
+            println!("Could not read from file '{}': {}", path.display(), why);
+            return Err("Could not read file");
+        },
+        Ok(_) => (),
+    }
+
+    let mut results = std::vec::Vec::<(String, String)>::new();
+    let lines = content.lines();
+    for line in lines {
+        if line.starts_with('#') {
+            continue;
+        }
+        let result = line.split_once('=');
+        if result.is_none() {
+            println!("Skipping configuration line '{}', no key-value delimiter (=) found", line);
+            continue;
+        }
+
+        let key = result.unwrap().0.trim();
+        let value = result.unwrap().1.trim();
+        if key.eq("") || value.eq("") {
+            println!("Skipping configuration line '{}', no key or value side is empty", line);
+            continue;
+        }
+        results.push((key.to_string(), value.to_string()));
+    }
+    return Ok(results);
+}
+
 #[cfg(test)]
 mod tests {