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#!/bin/sh
# Copyright 2007 Jari Aalto;
# Copyright 2019-2022 Bastien Roucariès
PATH="$PATH:/usr/share/sensible-utils/bin"

program="$(realpath "$(command -v "$0")")"

TryEnv()
{
    # global $candidate
    [ -z "$candidate" ] && return
    # Prevent recursive loops, where environment variables are set to this script
    [ x$(realpath "$(command -v "$candidate" || true)" || true) = x"$program" ] && return
    # interpret like environ (7) man page. Do not use eval in order to not leak variables
    sh -c "$candidate \"\$@\"" TERMINAL_EMULATOR "$@"
    ret=$?
    # Operating system command not found
    [ "$ret" -ne 126 ] && [ "$ret" -ne 127 ] && exit "$ret"
}

TryCmd()
{
    [ -n "$(command -v $candidate)" ] && TryEnv "$@"
}

for candidate in "$TERMINAL_EMULATOR" "$SENSIBLE_TERMINAL_EMULATOR"; do
    TryEnv "$@"
done

if [ -n "$XDG_CURRENT_DESKTOP" ]; then
    candidate="sensible-terminal-$(echo "$XDG_CURRENT_DESKTOP" | tr '[:upper:]' '[:lower:]')"
    TryCmd "$@"
fi

candidate=x-terminal-emulator
TryCmd "$@"

echo "Couldn't find a terminal emulator!" 1>&2
echo 'Set the $TERMINAL_EMULATOR environment variable to your desired terminal emulator.' 1>&2
exit 1