How to use bg and fg ?

[iroku312]

I use to edit files with:

$ vim file
$ Job 1, 'vim file' has stopped # I use Ctrl-Z to send vim in background
$ ... # I do some commands in the terminal
$ fg # I send the last job, vim, in foreground
Send job 1 (vim file) to foreground

So i can for exemple modify file, test it, re-modify it...

How could i do that with micro ?
Ctrl-Z is mapped to undo, which is useful, but it prevent me to send "micro" to background.
I already tested to add
"Ctrl-z": "None"
in ~/.config/micro/bindings.json. Its prevent Ctrl-z to undo but micro do not go in background.

I could accept to use other key thant ctrl-z to background, or to config micro...
Any suggestion ?

[Andriamanitra]

You can emulate the usual Ctrl-z behavior by sending TSTP (terminal stop) signal to the process. That may be done from inside micro by running a command: run sh -c 'kill -s TSTP $PPID'. This starts a new subprocess that sends the signal to its parent process (identified by the $PPID environment variable). However this seems to leave the terminal in a messy state (the screen is not cleared when micro receives the signal, and the screen is also not properly restored when you foreground micro again), and I don't think there's any easy way to fix it (except patching micro to handle the signal gracefully).

~/.config/micro/bindings.json

{
    "Ctrl-z": "command:run sh -c 'kill -s TSTP $PPID'",
}

Alternative solution

Another approach which is not quite what you were asking for would be to make a command that starts a new interactive shell as a subprocess of micro. Downside is that you might not have shell history from the session where you originally started micro (fish-shell is smart enough to share the history between sessions, bash is not).

~/.config/micro/init.lua

local config = import("micro/config")
local shell = import("micro/shell")
function init()
    config.MakeCommand("bash", function () shell.RunInteractiveShell("bash", false, false) end, config.NoComplete)
end

~/.config/micro/bindings.json

{
    "CtrlAlt-z": "command:bash",
}

[iroku312]

local config = import("micro/config")
local shell = import("micro/shell")
function init()
    config.MakeCommand("fish", function () shell.RunInteractiveShell("fish", false, false) end, config.NoComplete)
end

Just to add the first line which was missing.

If I choose the second solution, Ctrl-D can get me back to the file I was editing. This second method work very well with fish.
I am astonished by the quality of your response. Thank you very well.

[Andriamanitra]

Thanks for pointing out the missing import, I've added it to the original answer.