# Configuration
How OpenLogi stores its settings. For install and usage, see the
[README](../README.md).
Config is a TOML file, read on startup and written atomically on change:
- macOS & Linux: `$XDG_CONFIG_HOME/openlogi/config.toml` (default `~/.config/openlogi/config.toml`)
- Windows: `%USERPROFILE%\.config\openlogi\config.toml`
Everything below is managed by the GUI (Settings window, action picker, DPI /
SmartShift / lighting panels), but the file stays hand-editable; OpenLogi
reloads it on startup. Older `schema_version = 1` files (separate
`button_bindings` / `gesture_bindings` tables) are migrated to the unified
`bindings` map on first load.
Per-device settings are keyed by the HID++ identifier (e.g. `2b042` for an
MX Master 4):
- `bindings` — one entry per rebindable button: either a single action, or a
per-direction table for the gesture button.
- `per_app_bindings` — overlays keyed by application id (bundle id such as
`com.microsoft.VSCode` on macOS, `WM_CLASS` on Linux/X11) that take
precedence while that app is frontmost.
- `dpi_presets` — the ordered list cycled by the `CycleDpiPresets` action.
- `lighting` — static RGB colour, brightness (0–100), and on/off for wired
RGB keyboards.
- `gesture_owner` — which button owns the gesture role, when chosen
explicitly (otherwise inferred).
The app-wide `[app_settings]` block holds `launch_at_login`,
`check_for_updates` (both off by default), `show_in_menu_bar` (macOS-only)
and `language` (absent = follow the system locale).
```toml
schema_version = 2
selected_device = "2b042"
[app_settings]
launch_at_login = true
language = "en"
[devices.2b042]
dpi_presets = [800, 1600, 3200]
[devices.2b042.bindings]
Back = "BrowserBack"
Forward = "BrowserForward"
# Gesture button: one action per swipe direction; Click = plain press.
[devices.2b042.bindings.GestureButton]
Click = "MissionControl"
Up = "MissionControl"
Down = "AppExpose"
Left = "PreviousDesktop"
Right = "NextDesktop"
# Per-app overlay: Back becomes Undo only while VS Code is frontmost.
[devices.2b042.per_app_bindings."com.microsoft.VSCode"]
Back = "Undo"
[devices.2b042.lighting]
enabled = true
color = "ff0000"
brightness = 80
```
Action names are the catalog's variant names (`LeftClick`, `MouseBack`,
`Copy`, `PlayPause`, `CycleDpiPresets`, …); recorded keyboard shortcuts
serialize as a `CustomShortcut` table written by the GUI's recorder.