Console Commands in HalideOS #

The console in Halide is pretty simple. Just a while loop that evaluates the the commands entered by the user using a big nested if-else, and then defers execution of the command to the proper functions.

• Files: include/console.h and src/console.cpp

The console supports the following commands

• about
• help
• greet
• calculator - A basic command line calculator
• clear
• switch console - Switches to the next console

Refer the src/console.cpp file to look at the implementation of these commands. Most of them are pretty simple as they just print text on the framebuffer.

The calculator is the only command that does some work, it evaluates the passed expression and returns the results. We implemented a standard infix to postfix converter and evaluated that postfix expression. The calculator is the reason we implemented a stack abstraction in the standard library.