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schema: spec-driven
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created: 2026-07-30
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## Context
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The desktop already uses Home Manager modules under `modules/home-manager` and keeps Hyprland keybinds in `modules/home-manager/hyprland/default.nix`. The new capability is a small user-session workflow, not a daemon: select a region with `slurp`, record it with the Wayland-native `wf-recorder`, encode the result with `ffmpeg`, and publish the finished file with `wl-copy`.
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The same Hyprland bind must start and stop the workflow. The first invocation needs to remain alive while recording; a later invocation needs a stable way to find and signal that process. The implementation also needs to avoid leaving partial files in the screenshots directory when selection is cancelled or encoding fails.
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## Goals / Non-Goals
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**Goals:**
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- Encapsulate packages, script, option, output directory, and runtime state in `modules/home-manager/gif-recorder`.
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- Use a single toggle command suitable for a Hyprland `bind`.
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- Select a rectangular region interactively through `slurp`.
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- Save optimized GIF output in `~/Pictures/Screenshots` and copy it as `image/gif` with `wl-copy`.
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- Keep host wiring minimal: import/enable in `hosts/jpporta-nixos/home.nix`, bind in the existing Hyprland module.
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**Non-Goals:**
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- Full-screen or window recording modes.
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- A recording history, notification UI, configurable encoder settings, or a separate stop bind.
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- A new service or background daemon.
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- Changes to the existing screenshot flow.
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## Decisions
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### D1. One shell script owns the toggle state
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The module installs one `gif-recorder` executable and uses a runtime-directory state file containing the active script PID. If the state file names a live process, a new invocation sends it `SIGINT`; otherwise it runs `slurp` and starts a recording. This keeps the bind to one command and avoids adding a service or IPC layer.
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**Alternative:** use separate start/stop scripts or a systemd user service. Rejected because they add commands and lifecycle machinery for one short-lived action.
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### D2. Use `wf-recorder`, `slurp`, `ffmpeg`, and `wl-copy`
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These tools are small, composable Wayland utilities already suited to the requested flow. `wf-recorder` receives the geometry selected by `slurp`; `ffmpeg` handles palette generation and GIF encoding; `wl-copy --type image/gif` makes the resulting file available to Wayland clipboard consumers.
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**Alternative:** OBS or a screenshot/GIF application. Rejected because a GUI recorder is heavier than the requested Hyprshot-like interaction.
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### D3. Encode through a temporary video file
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Recording first to a temporary Matroska file keeps the output atomic: the final timestamped GIF is moved into `~/Pictures/Screenshots` only after `ffmpeg` succeeds. The encoder uses a palette-generation filter and a bounded frame rate/width to avoid the worst GIF size and color-quality problems without introducing configuration options.
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**Alternative:** record directly to GIF. Rejected because palette generation and interruption handling are worse, and `wf-recorder` is designed primarily for video output.
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### D4. Store state under `XDG_RUNTIME_DIR`
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The state file belongs in `${XDG_RUNTIME_DIR:-/tmp}` and is removed on normal completion or cancellation. It is session-local and avoids polluting the home directory with a lock file.
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## Risks / Trade-offs
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- [GIFs are inherently large and limited to 256 colors] -> Cap output at a modest frame rate and width; keep the original temporary recording out of the screenshots directory.
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- [A crashed process can leave a stale state file] -> Check whether the recorded PID is alive before treating the workflow as active, and remove stale state before starting.
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- [Clipboard consumers differ in GIF support] -> Publish with the explicit `image/gif` MIME type; the saved file remains the fallback when a consumer cannot paste animated images.
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- [The second bind may be pressed while region selection is active] -> Keep the controlling script PID in the state file before invoking `slurp`, and handle interruption by cleaning up without creating output.
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## Migration Plan
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1. Apply the Home Manager configuration for `jpporta-nixos`.
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2. Press the new Hyprland bind and select a region; press it again to stop and wait for encoding.
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3. Verify the GIF in `~/Pictures/Screenshots` and paste it into a GIF-capable Wayland application.
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4. Roll back by disabling/removing the module import and bind; no persistent data migration is required, and existing GIF files are left untouched.
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## Open Questions
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- The exact key combination should follow the existing screenshot bind convention in the Hyprland module; implementation should reuse that convention rather than introduce a new modifier scheme.
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## Why
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The Hyprland desktop has a screenshot flow but no equally convenient way to capture a short animated region of the screen. A Wayland-native GIF recorder should let the user select a region, press the same bind to stop, and receive the finished GIF in `~/Pictures/Screenshots` and on the clipboard.
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## What Changes
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- Add a new Home Manager module, `modules/home-manager/gif-recorder`, with a single enable option.
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- Provide a Wayland-native recording script using `wf-recorder` and `slurp` to select and record a screen region.
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- Toggle recording with one Hyprland bind: the first press starts region selection/recording and the next press stops it.
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- Convert the recording to an optimized GIF after stopping.
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- Save completed GIFs under `~/Pictures/Screenshots` with timestamped filenames.
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- Copy the completed GIF to the Wayland clipboard for immediate pasting.
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- Enable the module from `hosts/jpporta-nixos/home.nix` and add only the required bind in the existing Hyprland Home Manager module.
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## Capabilities
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### New Capabilities
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- `gif-recorder`: Select, toggle-record, save, and clipboard-copy short Wayland screen-region GIFs.
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### Modified Capabilities
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- None.
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## Impact
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- New Home Manager module and user-facing recording script.
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- Existing `modules/home-manager/hyprland/default.nix` gains the toggle bind.
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- `hosts/jpporta-nixos/home.nix` imports and enables the module.
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- Adds the runtime packages `wf-recorder`, `slurp`, `ffmpeg`, and a Wayland clipboard utility through the module.
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- Creates `~/Pictures/Screenshots` when a recording is completed; existing screenshot behavior remains unchanged.
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## ADDED Requirements
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### Requirement: Region recording is toggled by one command
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The GIF recorder SHALL use one executable that starts an interactive region recording when idle and stops the active recording when invoked again.
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#### Scenario: Start a recording
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- **WHEN** the recorder is invoked while no recording is active
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- **THEN** it lets the user select a rectangular Wayland region and starts recording that region
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#### Scenario: Stop a recording
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- **WHEN** the recorder is invoked while a recording is active
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- **THEN** it stops the active recording and begins finalization without starting a second recording
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#### Scenario: Cancel region selection
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- **WHEN** the user cancels region selection before recording starts
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- **THEN** the recorder exits without creating a GIF and clears its runtime state
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### Requirement: Completed recordings are saved as GIF screenshots
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The recorder SHALL save each successfully finalized recording as a timestamped `.gif` file below `~/Pictures/Screenshots`.
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#### Scenario: Successful finalization
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- **WHEN** an active recording is stopped and encoding succeeds
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- **THEN** the recorder creates the screenshots directory if needed and stores one completed GIF there
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#### Scenario: Failed finalization
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- **WHEN** recording or GIF encoding fails
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- **THEN** the recorder does not publish a partial GIF as a completed screenshot and removes temporary recording data
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### Requirement: Completed recordings are copied to the Wayland clipboard
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After successful GIF encoding, the recorder SHALL copy the resulting file to the Wayland clipboard using the `image/gif` MIME type.
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#### Scenario: Clipboard copy succeeds
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- **WHEN** a GIF is successfully written
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- **THEN** the recorder publishes that GIF to the clipboard as `image/gif`
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#### Scenario: Clipboard copy is unavailable
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- **WHEN** a GIF is successfully written but clipboard publication fails
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- **THEN** the recorder preserves the GIF in `~/Pictures/Screenshots` and exits without deleting it
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### Requirement: Home Manager integration is opt-in
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The feature SHALL be exposed as a Home Manager module with an enable option, and enabling it SHALL install all required runtime tools and the recorder executable.
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#### Scenario: Module enabled
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- **WHEN** `custom.gif-recorder.enable` is true
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- **THEN** the user environment contains the recorder command and its Wayland recording, selection, encoding, and clipboard dependencies
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#### Scenario: Module disabled
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- **WHEN** `custom.gif-recorder.enable` is false
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- **THEN** the module adds no GIF recorder command, packages, or Hyprland bind
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## 1. Add the Home Manager module
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- [x] 1.1 Create `modules/home-manager/gif-recorder/default.nix` with `custom.gif-recorder.enable` and an enabled-only configuration.
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- [x] 1.2 Install `wf-recorder`, `slurp`, `ffmpeg`, and `wl-clipboard` through the module and expose one `gif-recorder` script in the user's session path.
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- [x] 1.3 Implement the toggle state under `XDG_RUNTIME_DIR`: start region selection/recording when idle, signal the active process on the second invocation, clean up on cancellation/interruption, and reject stale state.
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- [x] 1.4 Finalize successful recordings with palette-based `ffmpeg` GIF encoding, timestamp the output below `~/Pictures/Screenshots`, and copy it with `wl-copy --type image/gif` while preserving the saved file if clipboard copy fails.
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## 2. Wire the feature into the existing host
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- [x] 2.1 Import `../../modules/home-manager/gif-recorder` and set `custom.gif-recorder.enable = true` in `hosts/jpporta-nixos/home.nix`.
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- [x] 2.2 Add `SUPER + SHIFT + 5` to the existing `Screenshots` section of `modules/home-manager/hyprland/default.nix`, invoking `gif-recorder` so the same bind starts and stops the capture.
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## 3. Verify the workflow
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- [x] 3.1 Evaluate/build the `jpporta-nixos` Home Manager activation package and confirm the module and script parse successfully.
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- [x] 3.2 Confirm the bind invokes the installed command and that the runtime dependency paths are available in the script.
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- [ ] 3.3 In a live Hyprland session, select a region, stop with the same bind, and verify a timestamped GIF appears in `~/Pictures/Screenshots` and can be pasted from the Wayland clipboard.
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- [ ] 3.4 Verify canceling `slurp`, stopping early, and an encoding failure leave no partial GIF and no stale runtime state.
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