Open Source Crystal Terminals

Interactive console for Crystal programming language. Every time you press Enter it adds a new instruction, generates a new crystal program, and executes it. The output is split into 2 parts: regular program output (e.g. output from puts 10) and the value returned by the last command. The regular output is saved, and when you type a new instruction, a new program is generated. The saved output is subtracted from the new output, and the difference is printed out. It creates an illusion that only new instructions are executed.