ipinfo

#!/usr/bin/env bash

# More safety by turning bugs into errors.
# Use `${PIPESTATUS[n]}` to check for the `n`-th pipe command's exit status.
# Make sure there are no uninitialized variables.
# To allow a non-zero exit status or to allow a pipe to fail without exiting
# the script, prefix the command with `!`.
# Option `noclobber` makes sure piping into a file with `>` does not
# override existing files. Use `>|` to overwrite files instead.
# Environment variables are `UPPER_SNAKE_CASE`, global constants are
# `_UNDERSCORE_PREFIXED` and global variables are `_underscore_prefixed`
set -o errexit -o pipefail -o nounset -o noclobber

: ${XDG_CONFIG_HOME:=$HOME/.config}
: ${XDG_CACHE_HOME:=$HOME/.cache}

readonly _SCRIPT="$(realpath "$0")"
readonly _SCRIPT_NAME="${_SCRIPT##*/}"
readonly _SCRIPT_DIR="${_SCRIPT%/*}"

err() { echo >&2 "${_SCRIPT_NAME}: $@"; }

readonly _ERR_USAGE=2
readonly _ERR_PROGRAMMING=255

readonly _USAGE="
  Usage:
    $_SCRIPT_NAME [options] [api-path]

  OPTIONS:
    -h, --help      Show this help message.

  ARGUMENTS:
    api-path    Path added to the API URL like so: \`https://ipinfo.io/<api-url>\`
                Examples:
                  - ip           - Get current ip as plaintext
                  - 1.1.1.1      - Get ipinfo on 8.8.8.8
                  - 8.8.8.8/org  - Get paintext organization of 8.8.8.8
                  - 2620:fe::9   - Get ipinfo on an IPv6
"

readonly _OPTIONS='h'
readonly _LONGOPTS='help'

parsed="$(getopt -o "$_OPTIONS" -l "$_LONGOPTS" -n "$_SCRIPT_NAME" -- "$@")"
if [[ ${PIPESTATUS[0]} -ne 0 ]]; then echo >&2 "$_USAGE"; exit $_ERR_USAGE; fi
eval set -- "${parsed[@]}"; unset parsed

while [[ $# -gt 0 ]]; do
    case $1 in
        -h|--help)      echo "$_USAGE"; exit; ;;
        --)             shift; break; ;;
        *)              err "Programming error"; exit $_ERR_PROGRAMMING; ;;
    esac
done

# --- main program -------------------------------------------------------------

url_path=${1:-''}

curl -s "https://ipinfo.io/${url_path}"