[NymiiTechTips]

This pull request refactors the shell command handling in the kernel by moving the implementation of built-in commands from shell.c into dedicated source files under src/commands/, and introducing a new header, commands.h, to declare these commands. The shell now calls these functions instead of containing their logic inline, resulting in a cleaner and more modular codebase. Additionally, new command implementations are added, and the Makefile is updated to include the new source directory.

The most important changes are:

Command Refactoring and Modularity

• Extracted the logic for built-in shell commands (such as help, fetch, crash, reboot, poweroff, mia, memtest, uptime, echo, memdump, peek, and poke) from src/kernel/shell.c into individual source files under src/commands/, improving code organization and maintainability. The shell now calls these functions via the new commands.h interface. [1] [2]
• Added src/include/commands.h to declare all shell command functions and a utility function, ensuring consistent usage throughout the codebase. [1] [2]

New and Improved Command Implementations

• Improved or re-implemented command logic in their new files, including argument parsing, help messages, and output formatting for commands like echo, uptime, memdump, peek, and poke. [1] [2] [3] [4] [5]
• Added or updated commands such as crash, fetch, help, memtest, mia, reboot, and poweroff with clearer separation of concerns and better encapsulation. [1] [2] [3] [4] [5] [6] [7]

Build System Update

• Updated the Makefile to include the new src/commands/*.c source files in the build process.

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These changes make the shell easier to extend and maintain, and lay the groundwork for adding more commands in the future.