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RykeShell

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Introduction

RykeShell is a modern, custom Unix shell implemented in C++. It combines essential shell functionalities with advanced features to provide a user-friendly and efficient command-line environment. RykeShell supports enhanced command parsing, case-insensitive auto-completion with correct casing, built-in commands, customizable theming, and more.

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Features

• Customizable Prompt: Displays the username, hostname, and current directory with color customization using the theme command.

• Advanced Command Parsing: Supports piping (|), input/output redirection (>, <, >>), background execution (&), and command chaining (&&, ||).

• Built-in Commands:

  • cd: Change the current directory.
  • pwd: Display the current working directory.
  • history: View the command history.
  • alias: Create command aliases.
  • theme: Change the prompt color.
  • exit: Exit RykeShell.
  • help: Display help information for built-in commands.

• Wildcard Expansion: Supports glob patterns (*, ?) for file and directory matching.

• Environment Variable Expansion: Expands variables using $VAR and ${VAR}, including default values with ${VAR:-default}.

• Enhanced Auto-Completion:

  • Case-Insensitive Matching: Type commands and filenames without worrying about case sensitivity.
  • Correct Casing in Suggestions: Auto-completed suggestions use the correct casing as they exist in the filesystem or system commands.
  • Inline Suggestions: Provides suggestions as you type, with unmatched characters displayed in a different color.

• Signal Handling: Safely handles SIGINT (Ctrl+C) to prevent unintended termination.

• Multiline Support: Allows for multiline commands.

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Getting Started

Prerequisites

• C++20-Compatible Compiler: RykeShell requires a compiler that supports C++20 features (e.g., g++ version 10 or higher).

• C++ Standard Library and POSIX-Compliant System: Unix/Linux environment is required.

Building RykeShell

Clone the Repository

git clone https://github.com/BisocM/RykeShell.git
cd RykeShell

Build with CMake

RykeShell uses CMake for building. Ensure you have cmake installed.

mkdir build
cd build
cmake ..
make

Alternatively, Build Manually

If you prefer to compile directly with g++, ensure you compile with the -std=c++20 flag and include the necessary libraries.

Step 1: Navigate to the Source Directory

cd src

Step 2: Compile with g++

g++ -Wall -Wextra -std=c++20 -g -I../include -o RykeShell main.cpp utils.cpp input.cpp autocomplete.cpp parser.cpp executor.cpp commands.cpp -lncurses

Note: Replace g++ with g++-10 or higher if necessary.

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Running RykeShell

After building, you can run RykeShell using:

./RykeShell

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Usage

• Executing Commands: Type commands as you would in a standard shell.

  ls -l

• Auto-Completion:

  • Inline Suggestions: As you type, RykeShell provides inline suggestions for commands and filenames.
  • Accepting Suggestions: Press Tab to accept the suggestion.
  • Case-Insensitive Matching: Type commands and filenames without worrying about case; the shell matches them case-insensitively but preserves the correct casing.

  Example:

  • If you have a file named Makefile, typing cat ma will show an inline suggestion for Makefile, and pressing Tab will complete it to cat Makefile.

• Built-in Commands:

  • Change Directory

    cd /path/to/directory

  • Print Working Directory

    pwd

  • View Command History

    history

  • Set Alias

    alias ll='ls -l'

  • Change Prompt Theme

    theme blue

  • Exit RykeShell

    exit

  • Display Help

    help

• Advanced Command Features:

  • Piping

    ls | grep txt

  • Redirection

    • Output Redirection:

      ls > output.txt

    • Input Redirection:

      sort < unsorted.txt

    • Append Output:

      echo "New Line" >> file.txt

  • Background Execution

    long_running_command &

  • Command Chaining

    • AND Operator (&&):

      Execute the next command only if the previous command succeeds.

      mkdir new_dir && cd new_dir

    • OR Operator (||):

      Execute the next command only if the previous command fails.

      cd existing_dir || echo "Directory does not exist."

• Wildcard Expansion

  ls *.cpp

• Environment Variable Expansion

  echo $HOME
  echo ${USER}
  echo ${UNSET_VAR:-default_value}

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Customization

• Changing Prompt Color

  Use the theme command with one of the available colors:

  • red
  • green
  • yellow
  • blue
  • magenta
  • cyan

  Example:

  theme magenta

• Creating Aliases

  Create shortcuts for common commands:

  alias gs='git status'

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Contributing

We welcome contributions to RykeShell! Whether you're fixing bugs, adding new features, or improving documentation, your help is appreciated.

Issue Reporting

If you encounter any issues or have feature requests, please submit an issue on GitHub. We have issue templates to guide you:

• Bug Report
• Feature Request
• Question

When submitting an issue, please provide as much detail as possible to help us address it effectively.

Pull Requests

To contribute code:

1. Fork the Repository

2. Create a Feature Branch

   git checkout -b feature/your-feature-name

3. Commit Your Changes

   git commit -am 'Add new feature'

4. Push to Your Fork

   git push origin feature/your-feature-name

5. Submit a Pull Request

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License

RykeShell is released under the MIT License.

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Acknowledgments

• Inspired by traditional Unix shells and built with modern C++ features.
• Thanks to all contributors who have helped improve RykeShell.

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Contact

For questions or suggestions, feel free to open an issue or reach out to the maintainer.

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Note on Compilation

RykeShell makes use of C++20 features. Ensure your compiler supports C++20. You can check your g++ version:

g++ --version

If necessary, install a newer version of g++.

Example Installation on Ubuntu

sudo apt-get update
sudo apt-get install g++-10

Then, compile using g++-10:

g++-10 -Wall -Wextra -std=c++20 -g -I../include -o RykeShell main.cpp utils.cpp input.cpp autocomplete.cpp parser.cpp executor.cpp commands.cpp -lncurses

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