Adding and creating a sime shell for the os?

[0xC0ba1t]

Hi guys,
I wanted to expand and add a shell with some simple games with the os I created following the series, I know they are planned in edition 3 but is there a way to use it with edition 2, because only booting and the freestanding binary posts are completed, thanks.

[phil-opp]

Hi, the basic steps could be:

• Follow the blog until at least the Hardware Interrupts post because you need keyboard input for creating a shell.
• In addition to printing characters to the screen, add them to some kind of string buffer (e.g. a [char] array, or an alloc::string::String if you completed the Heap Allocation post already).
• On a newline character, match the string buffer against some possible commands.
• If it matches a command, run it and print the results. Then wait for the next input.

For more advanced command-line input (e.g. arguments and --flags), I recommend to use one of the many existing command-line parsing libraries on crates.io. For example the clap crate should be no_std compatible with default-features = false.