Running `bash` as a shell command freezes Femto-Emacs

[siraben]

After performing C-x @ and type bash RET, Femto-Emacs freezes and the process must be killed externally.

[hughbarney]

Agreed this is a bug. Note that starting a new shell was not what this command is designed for. The idea is to send a command to the shell and collect the output to a temporary file. For example 'ls -l' will run the command ls -l in the shell and the output will appear in a window. The issue could be fixed by checking if the command arguments are executing a shell. It looks like MicroEmacs checks if a shell is being run and falls back to simply dropping out to a shell until you type 'exit'. If you try this on Zile it will just return an empty window. Will fix when I get time in the femto repository at: https://github.com/hughbarney/femto