sway-sensible-terminal

#! /usr/bin/env python3

import os
import sys
import json
import subprocess

PATH = os.environ.get("PATH", "/usr/bin")
TERMINAL = os.environ.get("TERMINAL", "alacritty")
ARGS = sys.argv[1:]

def get_cwd(tree):
    for node in tree.get("nodes", []):
        if node["focused"]:
            name = node["name"]
            for part in name.split(":"):
                if part.startswith("/") and os.path.exists(part):
                    return part
        cwd = get_cwd(node)
        if cwd is not None:
            return cwd

if os.path.isfile("/usr/bin/swaymsg"):
    prog = "swaymsg"
elif os.path.isfile("/usr/bin/i3-msg"):
    prog = "i3-msg"
else:
    raise Exception("Neither swaymsg or i3-msg was found in /usr/bin/")

cmd = subprocess.run(f"{prog} -t get_tree", shell=True, check=True, capture_output=True)
tree = json.loads(cmd.stdout)
cwd = get_cwd(tree)
if cwd is not None:
    if "alacritty" in TERMINAL:
        ARGS = ["--working-directory", cwd, *ARGS]
    else:
        ARGS = ["-d", cwd, *ARGS]

for d in PATH.split(":"):
    path = os.path.join(d, TERMINAL)
    if not os.path.isfile(path):
        continue

    os.execl(path, path, *ARGS)

raise Exception(f"Error: terminal '{TERMINAL}' was not found in $PATH ({PATH})")