mesh-catalog/modules/dunst/README.md

# dunst

The notifier as a module (novox/hq ADR 0208, research 026/05).

- Installs `dunst`, and `libnotify` for `notify-send`, the client every program and these tools use.
- Claims the mesh's `node-notifier` seat and serves its verbs `send` and `history`.
- Owns `~/.config/dunst/dunstrc` and the directory `~/.config/dunst/dunstrc.d/`. Another module's
  rule is that module's own file in the directory (ADR 0208 §4). dunst reads the directory after
  `dunstrc`, so a drop-in outranks it.
- **Starts nothing.** The package registers dunst with D-Bus, which starts it on the first
  notification, inside the account's service manager. There is no autostart line and no
  session-start contribution. The package's own `dunst.service` is declared without a state, in the
  account's manager (`scope: user`, ADR 0177), only so the node-engine can reload it: when the mesh
  rewrites `dunstrc`, a running dunst is told to read it again (`reload-on`, the unit's
  `ExecReload=dunstctl reload`). A dunst that is not running is left alone and reads the file when the bus
  starts it (ADR 0117).
- **Requires no display of its own.** dunst speaks both X11 and Wayland and picks the one the session
  has, so it serves an X session and a later sway one alike.

## Answers from a notification

`send` with `actions` runs `notify-send --wait` with one `--action` per answer, answers the id at once and
waits in this bundle for the operator's choice (dunst offers the actions on a middle click, or in its
context menu). The token chosen is said as this module's event `action-chosen`; it becomes the
node-notifier seat's event once seats publish events of their own (novox/hq to-be 46 phase 3). Nothing
is said for a notification closed, expired or replaced without an answer, and a wait ends after seven
days. A notification that offers answers stays until dismissed (`expire_ms` 0). A restart of this bundle
ends the waits it held; it says `started` {machine} once it serves, and the operator channel shows the
open answers there again (novox/hq ADR 0258). `notify-send` prints the id before it waits, also into a
pipe (checked on the laptop on 2026-10-08: the id at once, and "Wait timeout expired" when it expired).

## Tools

Every tool goes over the account's session bus. None needs the screen, and each answers clearly when
the account is not logged in.

| tool | does |
|---|---|
| `node-notifier.send` | a notification: title, body, urgency, sender, icon, how long, and the answers it offers (`actions`: token and label); answers its id, and says the chosen answer later as the event `action-chosen` {id, token, machine} |
| `node-notifier.history` | what was shown, newest first, with how long ago |
| `dunst_pause` / `dunst_resume` | do not disturb: notifications are held back, not lost |
| `dunst_close_all` | clear the screen; the history keeps them |
| `dunst_rules` | the rules the running notifier holds, and the files they come from |
| `dunst_count` | shown, waiting, in history, and whether paused |
| `dunst_reload` | read the configuration again now, keeping what is shown; answers the files read and the font, font size and width they set, with the file each came from (dunst does not say its settings over the bus, so these are read from the same files) |

## Settings

Two preferences have defaults in the definition (novox/hq ADR 0262). The mesh's layer, then a machine's,
overrides them, and the file is written with the value, never with a variable dunst reads.

| setting | default | what it is |
|---|---|---|
| `font-size` | 10 | the points of `font = Inter <size>`; 10 reads well on a screen of about 100 DPI, which is the workstations |
| `width` | 250 | the notification's width in pixels; a larger font needs a wider notification |

A machine with a denser screen sets both for itself, and the next push writes them:

    mesh-controller.settings {module: "dunst", node: "<machine>", values: '{"font-size": 16, "width": 400}'}

`mesh-controller.settings {module: "dunst", node: "<machine>"}` shows each value and where it came from:
the default, the mesh, or the machine. When the push rewrites `dunstrc`, the node-engine reloads the
running dunst, so the next notification is drawn at the new size, without a login. A reload keeps the
notifications on screen and in the history; a restart would drop them, which is why this is a reload.

## What it chose, and what it improves

The workstations' files differed: one had the notifications bottom-right, 15 % transparent and with
rounded corners; the other top-right, opaque and square. This module takes the second, because the
rest of the desktop is square and opaque, and the top-right corner sits under the bar that shows the
count. The file keeps only the settings that differ from dunst's defaults.

- **The context menu works.** It called `/usr/bin/dmenu`, installed on neither machine. It now calls
  `dmenu`, the seat command of whichever module holds `node-launcher` (`rofi` on the workstations).
- **The face is the interface one,** Inter (research 026/04), instead of a monospace Nerd font.
- `icon_path`, which named two directories of an icon theme that is not installed, is gone. The icon
  theme is looked up recursively.

## What it leaves as found

- `~/.config/dunst/dunstrc.d/50-slack.conf`, the Slack rule. It becomes the Slack module's own drop-in
  when there is one, and until then it is the operator's file in a directory this module owns.

## Migration (ADR 0182)

- The first push keeps the found `dunstrc` once, then writes the module's.
- **The desktop runs two notification daemons** because its session began before the session bus
  fix (research 026/01). That ends at the next login, and nothing here starts a second one.
  `dunst_count` after logging in again shows the one daemon's counts.

## Blockers

- `node-notifier` is ADR 0208's seat. Until the controller knows it, `mctl` reads the claim as
  unknown.
- `dunst_rules` and the counts ask the running notifier. When none runs, the bus starts one, which
  needs a session to draw on.