#!/bin/bash
# Fuzzel's normal application launcher, with a web-search escape hatch.
#
#   Enter      launch the highlighted application
#   Alt+Enter  search the web for whatever you typed
#
# The script plays two roles. With no arguments it starts fuzzel, passing
# itself as --launch-prefix. Fuzzel then re-invokes it with the argv it was
# about to run, which is where the search fallback happens: Alt+Enter is bound
# to execute-input (see [key-bindings] in fuzzel.ini), which hands over the
# raw input text rather than a desktop entry, and raw text that isn't an
# executable becomes a search.

browser_app_id="google-chrome"
search_url="https://duckduckgo.com/?q="

search_web() {
    local query
    query=$(jq -rn --arg q "$1" '$q|@uri')
    xdg-open "$search_url$query" &

    # Wait for the browser window instead of guessing at a fixed sleep: a cold
    # start takes well over half a second, while an already-running Chrome is
    # ready almost immediately.
    local _
    for _ in $(seq 40); do
        if swaymsg -t get_tree |
            jq -e --arg id "$browser_app_id" \
                'recurse(.nodes[]?, .floating_nodes[]?) | select(.app_id == $id)' >/dev/null; then
            swaymsg "[app_id=\"$browser_app_id\"] focus" >/dev/null
            return 0
        fi
        sleep 0.05
    done
}

# No arguments: we are the keybinding. Start fuzzel with its default list.
if (( $# == 0 )); then
    exec fuzzel --launch-prefix="$(realpath -- "$0")"
fi

# Arguments: fuzzel is asking us to launch something. It exports desktop entry
# metadata only for real entries, so DESKTOP_ENTRY_ID tells the two apart -
# checking whether argv looks like a command does not, because "who is alan
# turing" and "test if it works" both start with a real executable.
if [[ -n ${DESKTOP_ENTRY_ID:-} ]]; then
    exec "$@"
fi

search_web "$*"