Finished the first two waves

src/Main.java

@@ -6,34 +6,18 @@
 
 public class Main {
     public static void main(String[] args) {
+        // Creating a scanner object to read in the  user input
         Scanner s = new Scanner(System.in);
 
         System.out.print("Enter the CSV filename: ");
         String f = s.nextLine();
 
-        List<Map<String, String>> dta = new ArrayList<>();
-        try (Scanner fs = new Scanner(new File(f))) {
-            fs.nextLine();
-
-            while (fs.hasNextLine()) {
-                String[] v = fs.nextLine().split(",");
-
-                int chg = Integer.parseInt(v[2]);  
-
-                Map<String, String> mp1 = new HashMap<>();
-                mp1.put("id", v[0]);  
-                mp1.put("tm", v[1]);  
-                mp1.put("chg", String.valueOf(chg));
-                dta.add(mp1);
-            }
-        } catch (FileNotFoundException e) {
-            System.out.println("Error reading the file: " + e.getMessage());
-            s.close();
-            return;
-        }
+        parseCSV(f);
 
+        //  Filters through the original map and adds a new list to a second map
+        // along with the id
         Map<String, List<Map<String, String>>> mp2 = new HashMap<>();
-        for (Map<String, String> d : dta) {
+        for (Map<String, String> d : forkList) {
             String id = d.get("id");
             List<Map<String, String>> lst = mp2.get(id);
             if (lst == null) {
@@ -42,22 +26,28 @@ public static void main(String[] args) {
             }
             lst.add(d);
         }
+        // checks the size of the second map
         int cnt = mp2.size();
 
+        // Lets the user know how many forks are available from the file
         System.out.println("There are " + cnt + " forks available (fork1 to fork" + cnt + ").");
         System.out.print("Enter the fork number to analyze (or 'all' for all forks): ");
         String inp = s.nextLine();
 
+        // initializes an empty list 
+        // checks to see if the user entered all or a # 
+        // routes them to to the right fork #
         List<Map<String, String>> sel;
         if (inp.equalsIgnoreCase("all")) {
-            sel = dta;
+            sel = forkList;
         } else {
             String id = "fork" + inp; 
             sel = mp2.get(id);
         }
 
         int sz = sel.size();
 
+        // formats the date and time
         DateTimeFormatter f1 = DateTimeFormatter.ISO_DATE_TIME;
         LocalDateTime lat = null;
         for (Map<String, String> d : sel) {
@@ -69,6 +59,7 @@ public static void main(String[] args) {
         DateTimeFormatter f2 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss", Locale.getDefault());
         String latT = lat.format(f2);
 
+        // perform some basic math to grab stats
         double tot = 0.0;
         int tlc = 0;
         for (Map<String, String> d : sel) {
@@ -90,6 +81,7 @@ public static void main(String[] args) {
             }
         }
 
+        // showcases those stats
         System.out.println("\nStatistics:");
         System.out.println("Number of commits: " + sz);
         System.out.println("Most recent commit timestamp: " + latT);
@@ -100,4 +92,36 @@ public static void main(String[] args) {
 
         s.close();
     }
+    public static List<Map<String, String>> parseCSV(String filename){
+
+        // Creates a scanner object that reads a file name
+        // adds contents from file into a map
+        List<Map<String, String>> forkList = new ArrayList<>();
+        try (Scanner fs = new Scanner(new File(f))) {
+            fs.nextLine();
+            Map<String, String> indiForkMap = new HashMap<>();
+            // 
+            while (fs.hasNextLine()) {
+                // Read through string and split at each comma, adding
+                // to a string array
+                String[] v = fs.nextLine().split(",");
+
+                int chg = Integer.parseInt(v[2]);  
+
+                // Adding all three elements to a map with the specific
+                // key added for each type of variable
+
+                indiForkMap.put("id", v[0]);  
+                indiForkMap.put("tm", v[1]);  
+                indiForkMap.put("chg", String.valueOf(chg));
+                forkList.add(indiForkMap);
+            }
+            // Throws a file not found exception if the file does not exist
+        } catch (FileNotFoundException e) {
+            System.out.println("Error reading the file: " + e.getMessage());
+            s.close();
+            return null;
+        }
+        return forkList;
+    }
 }