Fix todo bug

docs/README.md

@@ -1,30 +1,71 @@
-# Duke User Guide
+# Earl User Guide
 
-// Update the title above to match the actual product name
+Earl is a **desktop chat application to track tasks, optimised for 
+use via a Command Line Interface (CLI)** while still having the
+benefits of a Graphical User Interface (GUI). If you can type fast,
+Earl can get your task management done faster than traditional GUI
+applications.
 
-// Product screenshot goes here
+![](Ui.png)
 
-// Product intro goes here
+## Features
 
-## Adding deadlines
+### Adding ToDos
+Adds a todo to the list of tasks.
 
-// Describe the action and its outcome.
+Format: `todo <task name>`
 
-// Give examples of usage
+Example: `todo homework`, `todo wash clothes`
 
-Example: `keyword (optional arguments)`
+*Notes*
++ `<task name>` cannot be empty
 
-// A description of the expected outcome goes here
+### Adding Deadlines
 
-```
-expected output
-```
+Adds a deadline to the list of tasks.
 
-## Feature ABC
+Format: `deadline <task name> /by <date time>`
 
-// Feature details
+Example: `deadline project submission /by 01/01/2024 2359`
 
+*Notes*
++ `<task name>` cannot be empty.
++ `<date time>` must be of the format `dd/mm/yyyy hhmm`
 
-## Feature XYZ
+### Adding Events
 
-// Feature details
+Adds an event to the list of tasks.
+
+Format: `event <task name> /from <date time> /to <date time>`
+
+Example: `event exam /from 01/01/2024 1200 /to 01/01/2024 1400`
+
+*Notes*
++ `<task name>` cannot be empty.
++ `<date time>` must be of the format `dd/mm/yyyy hhmm`
+
+### List
+
+Displays all tasks currently tracked.
+
+Format: `list`
+
+### Find
+
+Displays all tasks with details matching a pattern.
+
+Format: `find <pattern>`
+
+Example: `find wash clothes`
+
+### Mark
+
+Marks a task as complete.
+
+Format: `mark <index or range> [<index or range>, ...] `
+
+Example: `mark 1 3-5`
+
+*Notes*
++ Arguments are space separated single indices or ranges
++ Ranges must be of the form `<index>-<index>`

src/main/java/earl/logic/DeadlineHandler.java

@@ -31,8 +31,7 @@ public void handle(TaskList tasks, Ui ui) throws EarlException {
             ui.completeResponse();
         } catch (IndexOutOfBoundsException e) {
             throw new EarlException(
-                    ui.appendNewline("An error befalls.")
-                            + ui.appendNewline("Example use:")
+                    ui.appendNewline("An error befalls. Example use:")
                             + ui.leftPad("deadline <name> /by <due>"));
         } catch (Exception e) {
             throw new EarlException("Command hath faltered: "

src/main/java/earl/logic/EventHandler.java

@@ -30,8 +30,7 @@ public void handle(TaskList tasks, Ui ui) throws EarlException {
             ui.completeResponse();
         } catch (IndexOutOfBoundsException e) {
             throw new EarlException(
-                    ui.appendNewline("An error befalls.")
-                            + ui.appendNewline("Example use:")
+                    ui.appendNewline("An error befalls. Example use:")
                             + ui.leftPad("event <name>"
                                     + " /from <start> /to <end>"));
         } catch (Exception e) {

src/main/java/earl/logic/TodoHandler.java

@@ -19,6 +19,9 @@ public TodoHandler(String args) {
     @Override
     public void handle(TaskList tasks, Ui ui) throws EarlException {
         try {
+            if (args.isEmpty()) {
+                throw new EarlException("The description is devoid of detail.");
+            }
             Task added = tasks.add(TaskType.TODO.createTask(args));
             ui.buildResponse("A new todo, by virtue of your decree,");
             ui.buildResponse(
@@ -27,6 +30,8 @@ public void handle(TaskList tasks, Ui ui) throws EarlException {
             ui.buildResponse("The ledger of tasks bears witness to "
                     + tasks.getSize() + " endeavours.");
             ui.completeResponse();
+        } catch (EarlException e) {
+            throw e;
         } catch (IndexOutOfBoundsException e) {
             throw new EarlException(
                     ui.appendNewline("An error befalls. Example use:")