[FEATURE] pause

[nihaltp]

Fixes #84

Summary by CodeRabbit

• New Features
  • Added the pause command to the command suite. This new command halts script execution and waits for the user to press Enter before continuing. Users can now insert strategic pause points throughout their workflows and automated command sequences to maintain better control over execution timing and operational flow.

[github-actions]

🚀 Hi @nihaltp!

Thank you for contributing to MyCMD. A maintainer will review your PR shortly. 🎉

[coderabbitai]

Walkthrough

A new pause command is implemented and registered in the application, enabling users to halt execution and resume by pressing Enter. The implementation includes a new PauseCommand class and registration in the command registry, with documentation checklist items updated to reflect completion.

Changes

Cohort / File(s)	Change Summary
Documentation CheckList.md	Two checklist items marking "pause" command completion updated from unchecked to checked state in "Automation & Scripting" and "Internal (cmd.exe Built-in) Commands" sections.
New Command Implementation src/main/java/com/mycmd/commands/PauseCommand.java	New class implementing the Command interface; provides execute() method that prompts user to press Enter, description() and usage() metadata methods, with exception handling for input operations.
Command Registry src/main/java/com/mycmd/App.java	Registers PauseCommand in the command registry mapping "pause" keyword to a new instance of PauseCommand within registerCommands() method.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant Shell as Shell/REPL
    participant PauseCommand
    participant System

    User->>Shell: Enters "pause" command
    Shell->>Shell: Looks up "pause" in registry
    Shell->>PauseCommand: execute(args, context)
    PauseCommand->>System: Print "Press any key to continue..."
    PauseCommand->>System: Wait for user input (System.in.read())
    User->>System: Presses Enter
    System-->>PauseCommand: Input received
    PauseCommand-->>Shell: Command complete
    Shell-->>User: Ready for next command

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Focus areas: Verify that PauseCommand.execute() properly handles exceptions during System.in.read() and confirm command registration is correctly placed in registerCommands().

Poem

🐰 A pause command hops into place,
Giving shells a moment's grace,
Press Enter and away we go,
The rabbit's feature steals the show! ✨

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The pull request title "[FEATURE] pause" directly and clearly summarizes the main change in the changeset. The title accurately reflects that this PR adds a new pause command feature, which is corroborated by the creation of the PauseCommand class, its registration in the command registry, and the corresponding documentation updates in CheckList.md. The title is concise, specific, and would allow a developer scanning the history to immediately understand the primary change.
Linked Issues Check	✅ Passed	The pull request fully addresses the requirement specified in linked issue #84, which requests adding the pause command. The PR implements this by creating a new PauseCommand class that implements the Command interface, registering it in the command registry within App.java, and updating the CheckList.md to mark the pause command as completed. The implementation includes all necessary methods (execute, description, usage) to provide functional pause command capability to users.
Out of Scope Changes Check	✅ Passed	All changes in the pull request are directly related to the scope of adding the pause command feature. The modifications include the core implementation (PauseCommand.java), command registry integration (App.java), and documentation updates (CheckList.md) that mark the feature as complete. No unrelated or extraneous changes are present in the changeset.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d9ef9fa and 38c7f45.

📒 Files selected for processing (3)

• CheckList.md (2 hunks)
• src/main/java/com/mycmd/App.java (1 hunks)
• src/main/java/com/mycmd/commands/PauseCommand.java (1 hunks)

🧰 Additional context used

🧬 Code graph analysis (1)

src/main/java/com/mycmd/commands/PauseCommand.java (1)

src/main/java/com/mycmd/ShellContext.java (1)

• ShellContext (7-151)

🔇 Additional comments (5)

CheckList.md (1)

111-111: LGTM! Documentation updated consistently.

Both occurrences of the pause command are correctly marked as complete, reflecting the implementation added in this PR.

Also applies to: 191-191

src/main/java/com/mycmd/App.java (1)

110-110: LGTM! Command registered correctly.

The pause command registration follows the established pattern used for other commands in the registry.

src/main/java/com/mycmd/commands/PauseCommand.java (3)

1-6: LGTM! Proper structure and imports.

The class is correctly structured with appropriate package declaration and imports, implementing the Command interface as expected.

---

26-29: LGTM! Clear and accurate description.

The description accurately conveys the command's functionality.

---

31-34: LGTM! Usage correctly reflects no-argument command.

The usage string accurately indicates that the pause command takes no arguments.

[coderabbitai]

⚠️ Potential issue | 🟠 Major

Input buffering conflict causes command corruption.

The main loop in App.java uses a Scanner reading from System.in, but this implementation directly calls System.in.read(). This creates two critical problems:

1. Incomplete read: System.in.read() only consumes a single byte, not the entire line. If the user types anything before pressing Enter, leftover characters remain in the input buffer.

2. Buffer conflict: Direct System.in access bypasses the Scanner's buffering. Remaining characters will be consumed by the next sc.nextLine() call in the main loop, corrupting the subsequent command.

Example failure scenario:

> pause
Press Enter to continue...
hello[Enter]    ← user input
> ello          ← corrupted next prompt (consumes remaining "ello\n")
Unknown command: 'ello'

Recommended fix: Store the Scanner in ShellContext and use it consistently across all commands.

1. Add Scanner to ShellContext:

// In ShellContext.java
private Scanner scanner;

public ShellContext(Scanner scanner) {
    this.scanner = scanner;
    // ... rest of initialization
}

public Scanner getScanner() {
    return scanner;
}

2. Update App.java to pass Scanner to context:

Scanner sc = new Scanner(System.in);
ShellContext context = new ShellContext(sc);

3. Update PauseCommand to use the shared Scanner:

 @Override
 public void execute(String[] args, ShellContext context) {
     System.out.println("Press Enter to continue...");
-    try {
-        System.in.read();
-    } catch (Exception e) {
-        // Ignore exceptions during pause
-    }
+    context.getScanner().nextLine();
 }

This ensures all input operations use the same buffered input source, preventing buffer corruption.

🤖 Prompt for AI Agents

In src/main/java/com/mycmd/commands/PauseCommand.java around lines 17 to 24, the
command uses System.in.read() which only consumes a single byte and bypasses the
Scanner used by App.java causing leftover input and buffer conflicts; replace
direct System.in access by retrieving the shared Scanner from ShellContext (add
a Scanner field and getter in ShellContext and ensure App constructs
ShellContext with the single Scanner it created) and then call
scanner.nextLine() in PauseCommand to consume the entire line and wait for
Enter, handling exceptions as needed.