#!/bin/bash

set -o errexit
set -o nounset
set -o pipefail
shopt -s globstar nullglob

function show_help ()
{
   cat >&2 <<EOF
usage: $(basename "$0") [OPTION...]

OPTIONS
  -v   Verbosity.  Repeat for more verbosity.
  -h   This help.

Examples
   \$ $(basename "$0")
   \$ $(basename "$0") -vv
EOF
   exit 1
}
#------------------------------------------------------------------------------

declare -i VERBOSITY=0
while getopts ":hv" opt
do
   case $opt in
       v ) ((++VERBOSITY)) ;;
       * ) show_help ;;
   esac
done
shift $((OPTIND - 1))
#------------------------------------------------------------------------------

function squawk ()
{
    local -i NVOL=$1; shift
    if ((0 == NVOL)); then
        echo >&2 "$(basename "$0") $(date +'%T %Z')" "$@"
        exit 1
    elif ((NVOL <= VERBOSITY)); then
        echo "$(basename "$0") $(date +'%T %Z')" "$@"
    fi
    return 0
}
#------------------------------------------------------------------------------

# Express the VERBOSITY as an option string.
function vopt ()
{
    local str=""
    if ((0 < VERBOSITY)); then
        str="-v"
    fi
    for ((i = 1; i < VERBOSITY; i++)); do
        str="${str}v"
    done
    echo "$str"
    return 0
}
#------------------------------------------------------------------------------

squawk 1 "$(date --iso) started."

if [[ -n "${INSIDE_EMACS:-}" ]]; then
    squawk 1 "I'm inside emacs..."
    emacsclient "$@"
else
    squawk 1 "Not inside emacs..."
    # Attempt to clean up the possible messes that emacs makes.
    if ! pgrep --uid "$LOGNAME" --full 'emacs --daemon' >/dev/null
    then
        squawk 1 "No daemon, clearing lock..."
        rm -f ~/.emacs.d/.emacs.desktop.lock
    elif ! [[ -S /run/user/$UID/emacs/server ]]
    then
        squawk 1 "Killing daemon that lost its socket..."
        pkill --signal SIGKILL --uid "$LOGNAME" --full 'emacs --daemon'
        squawk 1 "Clearing lock..."
        rm -f ~/.emacs.d/.emacs.desktop.lock
    fi
    squawk 1 "daemon state should be good, so starting client..."
    exec emacsclient --tty --alternate-editor="" "$@"
fi

squawk 1 "done."
exit 0