[SOLVED] How to handle interrupt signal when reading from stdin in bash

How to handle interrupt signal when reading from stdin in bash

I'm playing around with bash read functionality. I like what I have so far as a simple layer on top of my current shell. The read -e does tab-complete and previous commands, and sending EOF with ctrl+d gets me back to my original shell. Here's my reference:

Bash (or other shell): wrap all commands with function/script

I'd like some help handling SIGINT, ctrl+c. In a normal shell, if you start typing and hit ^C halfway, it immediately ends the line. For this simple example, after ^C, I still have to hit return before it's registered.

How do I keep the nice things that readline does, but still handle SIGINT correctly? Ideally, it would send a continue statement to the while read loop, or somehow send a \n to STDIN where my read is waiting.

Example code:

#!/bin/bash
# Emulate bash shell

gtg=1

function handleCtrl-C {
    # What do I do here?
    gtg=0
    return
}

trap handleCtrl-C INT

while read -e -p "> " line
do
    if [[ $gtg == 1 ]] ; then
        eval "$line"
    fi
    gtg=1
done

Solution

I think I came up with something finally I liked. See SIGINT to cancel read in bash script? for that answer.