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#!/usr/bin/env python3
"""active-windows: emit icons for windows on the currently active
niri workspace, driven by niri's event-stream instead of polling."""
import json
import subprocess
import gi
from gi.repository import Gio, Gtk
gi.require_version("Gtk", "3.0")
icon_theme = Gtk.IconTheme.get_default()
_icon_cache: dict[str, str] = {}
def resolve_icon_path(app_id: str) -> str:
if not app_id:
return ""
if app_id in _icon_cache:
return _icon_cache[app_id]
app_info = Gio.DesktopAppInfo.new(f"{app_id}.desktop") \
or Gio.DesktopAppInfo.new(f"{app_id.lower()}.desktop")
# fall back: scan installed .desktop files for a matching StartupWMClass
if app_info is None:
for info in Gio.AppInfo.get_all():
if isinstance(info, Gio.DesktopAppInfo):
wm_class = info.get_startup_wm_class()
if wm_class and wm_class.lower() == app_id.lower():
app_info = info
break
icon_path = ""
gicon = app_info.get_icon() if app_info else None
if gicon is not None:
lookup = icon_theme.lookup_by_gicon(gicon,
32,
Gtk.IconLookupFlags.FORCE_SIZE)
if lookup:
icon_path = lookup.get_filename() or ""
if not icon_path:
# last resort: treat app_id itself as an icon-theme name
lookup = icon_theme.lookup_icon(app_id,
32,
Gtk.IconLookupFlags.FORCE_SIZE)
if lookup:
icon_path = lookup.get_filename() or ""
_icon_cache[app_id] = icon_path
return icon_path
def niri_json(*args):
out = subprocess.run(["niri", "msg", "-j", *args],
capture_output=True,
text=True,
check=True)
return json.loads(out.stdout)
def emit_active_windows():
workspaces = niri_json("workspaces")
windows = niri_json("windows")
active_ws = next((w for w in workspaces if w.get("is_active")), None)
active_id = active_ws["id"] if active_ws else None
result = [
{
"id": w["id"],
"title": w.get("title", ""),
"app_id": w.get("app_id") or "",
"is_focused": w.get("is_focused", False),
"icon": resolve_icon_path(w.get("app_id") or ""),
}
for w in windows
if w.get("workspace_id") == active_id
]
print(json.dumps(result), flush=True)
RELEVANT_EVENTS = {
"WindowOpenedOrChanged", "WindowClosed", "WindowFocusChanged",
"WorkspaceActivated", "WorkspacesChanged", "WindowsChanged",
}
def main():
emit_active_windows()
proc = subprocess.Popen(
["niri", "msg", "-j", "event-stream"],
stdout=subprocess.PIPE, text=True, bufsize=1,
)
for line in proc.stdout:
try:
key = next(iter(json.loads(line)))
except (json.JSONDecodeError, StopIteration):
continue
if key in RELEVANT_EVENTS:
try:
emit_active_windows()
except subprocess.CalledProcessError:
pass
if __name__ == "__main__":
main()
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