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299# Pomodoro Timer - Single Process Specification
## Architecture
Single Go binary. No daemon, no CLI, no socket IPC. One process creates systray icon and manages all timer logic internally.
## Core Flow
```
User runs: ./pomodoro
→ Single process starts
→ Creates systray icon
→ Runs timer loop in goroutine
→ User controls via systray menu only
→ Process exits when user clicks Quit
```
## Timer Cycle
**3 work sessions per cycle:**
- Work (25min) → Short Break (5min) → Work (25min) → Short Break (5min) → Work (25min) → Long Break (20min) → [repeat]
**Phase transitions:**
- Work completes → Break starts immediately (notification + sound)
- Break completes → Enter WAITING state (notification + sound)
- User activity detected → Next work starts automatically
- Manual start available via menu during WAITING
## State Machine
```
IDLE (0/3)
↓ [Start clicked]
WORK (1/3) - 25:00
↓ [timer expires]
SHORT_BREAK (1/3) - 5:00
↓ [timer expires]
WAITING_WORK (1/3)
↓ [activity detected OR Start clicked]
WORK (2/3) - 25:00
↓ [timer expires]
SHORT_BREAK (2/3) - 5:00
↓ [timer expires]
WAITING_WORK (2/3)
↓ [activity detected OR Start clicked]
WORK (3/3) - 25:00
↓ [timer expires]
LONG_BREAK (3/3) - 20:00
↓ [timer expires]
WAITING_WORK (0/3) [counter resets]
↓ [activity detected OR Start clicked]
WORK (1/3) - 25:00 [cycle repeats]
```
**Pause behavior:**
- Pause available during WORK and BREAK phases only
- Paused timer shows ⏸️ prefix
- Not available during WAITING or IDLE
## Systray UI
### Icon States
4 PNG icons (16x16 or 24x24):
- `idle.png` - Gray circle - shown when IDLE or PAUSED
- `work.png` - Red tomato - shown during WORK
- `break.png` - Green coffee cup - shown during SHORT_BREAK and LONG_BREAK
- `waiting.png` - Yellow hourglass - shown during WAITING_WORK
Icon updates every second based on current phase.
### Title (Panel Text)
**No hover tooltip works reliably.** Title is the only visible text in system panel.
Format patterns:
```
IDLE: "Pomodoro"
WORK: "🍅 25:00 [1/3]"
SHORT_BREAK: "☕ 5:00 [1/3]"
LONG_BREAK: "🌴 20:00 [3/3]"
WAITING: "⏳ Ready [1/3]"
PAUSED: "⏸️ 25:00 [1/3]"
```
Format: `[emoji] [MM:SS] [completed/total]`
- Emoji indicates phase type
- MM:SS shows time remaining (omitted for WAITING/IDLE)
- [N/M] shows session progress
- Paused adds ⏸️ prefix
Updates every second during active timer.
### Context Menu (Right-Click)
Menu structure (static, always present):
```
Start/Resume
Pause
Skip Phase
Reset
─────────────
Quit
```
**Menu item states:**
| State | Start/Resume | Pause | Skip Phase | Reset |
|-------|-------------|-------|------------|-------|
| IDLE | Enabled | Disabled | Disabled | Disabled |
| WORK running | Disabled | Enabled | Enabled | Enabled |
| WORK paused | Enabled | Disabled | Enabled | Enabled |
| BREAK running | Disabled | Enabled | Enabled | Enabled |
| BREAK paused | Enabled | Disabled | Enabled | Enabled |
| WAITING | Enabled | Disabled | Enabled | Enabled |
**Actions:**
- **Start/Resume**:
- IDLE → Start first work (1/3)
- WAITING → Start next work
- PAUSED → Resume timer
- **Pause**:
- WORK/BREAK running → Pause timer
- **Skip Phase**:
- WORK → Skip to break (short or long based on session count)
- BREAK → Skip to WAITING
- WAITING → Start next work immediately
- **Reset**:
- Any state → IDLE (0/3), clear all progress
- **Quit**:
- Always enabled
- Exit process (no state persistence)
### Click Behavior
**Left click on icon:** Toggle Start/Pause
- IDLE → Start first work
- WAITING → Start next work
- Running → Pause
- Paused → Resume
**Right click:** Show menu
**Middle click:** None (not reliable)
## Notifications
Use `notify-send` for desktop notifications:
```bash
notify-send -a "Pomodoro" -i "appointment-soon" "Pomodoro Timer" "<message>"
```
**Notification triggers:**
| Event | Message |
|-------|---------|
| Work complete (→ short break) | "Work complete! Time for a short break." |
| Work complete (→ long break) | "Work complete! Time for a long break." |
| Break complete (→ waiting) | "Break over! Move your mouse when ready." |
| Timer paused | "Timer paused" |
| Timer resumed | "Timer resumed" |
## Sound
Embedded WAV files using `go:embed`:
**work.wav** (break → work transition):
- 800Hz sine wave
- 0.3 seconds duration
- 16-bit PCM, 44.1kHz sample rate
**break.wav** (work → break transition):
- 600Hz sine wave
- 0.5 seconds duration
- 16-bit PCM, 44.1kHz sample rate
Playback priority:
1. Try `paplay <file>` (PulseAudio)
2. Fallback `aplay -q <file>` (ALSA)
3. Silent fail if both unavailable
Extract embedded files to `/tmp/pomodoro-work-<uid>.wav` and `/tmp/pomodoro-break-<uid>.wav` on startup, reuse if exists.
## Activity Detection
Use `xprintidle` to detect user activity during WAITING state.
**Logic:**
- Poll every 500ms while in WAITING state
- Track previous idle time
- Activity detected if: `currentIdle < previousIdle` OR `currentIdle < 1000ms`
- On activity: automatically transition to next work phase
- If xprintidle unavailable: disable auto-start, require manual Start click
## Configuration
TOML file at `~/.config/pomodoro/config.toml`:
```toml
work_minutes = 25
short_break_minutes = 5
long_break_minutes = 20
work_sessions_per_cycle = 3
```
Load on startup. Missing file or invalid values → use defaults above.
No hot-reload: changes require restart.
## File Structure
```
pomodoro/
├── main.go # Entry point, systray setup
├── timer.go # Timer state machine and logic
├── config.go # TOML config loading
├── notify.go # Notifications and sound
├── activity.go # xprintidle monitoring
├── ui.go # Systray menu and updates
├── sounds/
│ ├── work.wav
│ └── break.wav
├── icons/
│ ├── idle.png
│ ├── work.png
│ ├── break.png
│ └── waiting.png
├── go.mod
└── README.md
```
## Dependencies
```go
require (
github.com/getlantern/systray v1.2.2
github.com/BurntSushi/toml v1.5.0
)
```
System packages:
- `libayatana-appindicator3-dev` (Ubuntu/Debian)
- `xprintidle` (optional, for activity detection)
- `pulseaudio-utils` or `alsa-utils` (for sound)
## Build
```bash
go build -o pomodoro .
```
Single binary output. No installation required - run directly.
## Usage
```bash
# Run (stays in foreground)
./pomodoro
# Run in background
./pomodoro &
# Autostart: create ~/.config/autostart/pomodoro.desktop
[Desktop Entry]
Type=Application
Name=Pomodoro Timer
Exec=/path/to/pomodoro
X-GNOME-Autostart-enabled=true
```
## Edge Cases
**Process killed:** All state lost, no recovery. User restarts from IDLE.
**Activity detection fails:** User must manually click Start in WAITING state.
**Sound playback fails:** Silent, continue timer normally.
**Notification fails:** Silent, continue timer normally.
**Multiple instances:** Each creates own systray icon. No lock file. User's problem.
## Non-Features
- No CLI interface
- No daemon/client architecture
- No state persistence
- No pause during WAITING/IDLE
- No custom notification sounds via config (embedded only)
- No statistics or history tracking
- No system tray tooltip (unreliable, title only)