Launches an executable under lldb-server and prints the URL to connect to this server from VSCode

vscode-debug.sh

#!/bin/bash

# Utility urlencode <string>
# https://gist.github.com/cdown/1163649
urlencode() {
    old_lc_collate=$LC_COLLATE
    LC_COLLATE=C

    local length="${#1}"
    for (( i = 0; i < length; i++ )); do
        local c="${1:$i:1}"
        case $c in
            [a-zA-Z0-9.~_-]) printf '%s' "$c" ;;
            *) printf '%%%02X' "'$c" ;;
        esac
    done

    LC_COLLATE=$old_lc_collate
}

# Find an unused port
# https://unix.stackexchange.com/questions/55913/whats-the-easiest-way-to-find-an-unused-local-port
read LOWERPORT UPPERPORT < /proc/sys/net/ipv4/ip_local_port_range
while :
do
        PORT="`shuf -i $LOWERPORT-$UPPERPORT -n 1`"
        ss -lpn | grep -q ":$PORT " || break
done

# See https://github.com/vadimcn/vscode-lldb/blob/master/MANUAL.md#debugging-externally-launched-code
LAUNCH_CONFIG="{\"request\":\"custom\",\"targetCreateCommands\":[\"target create $1\"],\"processCreateCommands\":[\"gdb-remote 127.0.0.1:$PORT\"]}"
DEBUG_URL="vscode://vadimcn.vscode-lldb/launch/config?$(urlencode "$LAUNCH_CONFIG")"
echo "Visual studio code debugger URL: $DEBUG_URL"

lldb-server gdbserver :$PORT -- $@