added working arguments parser with doc

src/main/java/fr/packageviewer/ArgParse.java

@@ -0,0 +1,47 @@
+package fr.packageviewer;
+
+import com.beust.jcommander.JCommander;
+
+
+/**
+ * Class to parse the command line arguments given by the user
+ * @author Capelier-Marla
+ */
+public class ArgParse {
+
+    /* distribution the user want */
+	private static String distribution;
+
+	/**
+	 * Get the command line argument given by the user, parse it with the parser and store it in the corresponding variable
+	 * @author Capelier-Marla
+	 * @param args the command line arguments given by the user
+	 * @return void
+	 */
+	static void parseArguments(String[] args) {
+		// create JCommander and CommandLineParams objects
+		JCommander jCommander = new JCommander();
+		CommandLineParams params = new CommandLineParams();
+		// add argument required by the params to the JCommander object
+		jCommander.addObject(params);
+        try {
+            // parse the argument from list of String
+            jCommander.parse(args);
+            // store the argument parsed in the variable
+            distribution = params.distribution;
+        } catch (Exception e) {
+            // if the parsing failed, print the error message and exit the program
+            System.out.println("You forgot the distribution name.");
+            System.exit(0);
+        }
+	}
+
+    /**
+     * Get the distribution name. If the user didn't give any or we didn't parsed, return null
+     * @author Capelier-Marla
+     * @return String: the distribution name
+     */
+    public static String getDistribution() {
+        return distribution;
+    }
+}

src/main/java/fr/packageviewer/CommandLineParams.java

@@ -0,0 +1,26 @@
+package fr.packageviewer;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.beust.jcommander.Parameter;
+
+/**
+ * Class to store and get the command line arguments given by the user
+ * @author Capelier-Marla
+ */
+public class CommandLineParams {
+    /**
+     * List of parameters given by the user
+     */
+    @Parameter
+    public List<String> parameters = new ArrayList<>();
+
+    /**
+     * Distribution the user want to search packages in
+     */
+    @Parameter(names = {"--distro", "-d"},
+               description = "Linux distribution to search in",
+               required = false)
+    public String distribution;
+}

src/main/java/fr/packageviewer/Main.java

@@ -1,7 +1,33 @@
 package fr.packageviewer;
 
+import com.beust.jcommander.JCommander;
+
 public class Main {
-	public static void main(String[] args) {
-		System.out.println("Hello world!");
+
+	/* distribution the user want */
+	private static String distribution;
+
+	/**
+	 * Get the command line argument given by the user, parse it with the parser and store it in the corresponding variable
+	 * @author Capelier-Marla
+	 * @param args the command line arguments given by the user
+	 * @return void
+	 */
+	static void parseArguments(String[] args) {
+		// create JCommander and CommandLineParams objects
+		JCommander jCommander = new JCommander();
+		CommandLineParams params = new CommandLineParams();
+		// add argument required by the params to the JCommander object
+		jCommander.addObject(params);
+		// parse the argument from list of String
+		jCommander.parse(args);
+		// store the argument parsed in the variable
+		distribution = params.distribution;
 	}
-}
+
+	public static void main(String[] args) {
+		// send the command line arguments to the parser
+		parseArguments(args);
+		System.out.println(distribution);
+	}
+}