Useful bash functions

funcs.sh

# Exit script if uninitialised variable is used:
set -o nounset

# Print the line number of the caller, the contents of the line, and exit with code 1
err_panic() {
    local msg="$1"
    local line_num="${BASH_LINENO[0]}"
    local source_file="${BASH_SOURCE[1]}"
    local line_content=$(sed -n "${line_num}p" "$source_file" | sed 's/^[ \t]*//')
    local red=$(tput setaf 1)
    local bold=$(tput bold)
    local reset=$(tput sgr0)


    echo "${bold}${red}--- ERROR ---${reset}" >&2
    echo "${bold}${msg:-"Runtime Error"}${reset}" >&2
    echo "${bold}[$source_file:$line_num]${reset}" >&2
    echo "${bold}  ╰─${reset} $line_content" >&2
    exit 1
}