# dlt-tui
[](https://crates.io/crates/dlt-tui)
[](https://opensource.org/licenses/MIT)
**A fast, keyboard-centric terminal viewer for Automotive DLT (Diagnostic Log and Trace) files.**
Analyze AUTOSAR DLT logs directly in your terminal — no GUI needed. Works over SSH on test benches, in CI pipelines, and inside Docker containers.
<p align="center">
<img src="assets/demo.png" alt="dlt-tui demo screenshot" width="700">
</p>
---
## Why dlt-tui?
| dlt-viewer requires a desktop GUI | Works in any terminal — SSH, CI runners, containers |
| Opening multi-GB DLT files is slow | Async streaming parser — starts displaying before full load |
| Context logs are split across files | Merges multi-file loads into one timestamp-ordered timeline |
| Finding the right log is tedious | Instant regex search + compound filters (Level × APP × CTX) |
| Compressed logs need manual extraction | Transparently reads `.dlt`, `.dlt.gz`, and `.dlt.zip` |
| Mouse-heavy workflows slow you down | Vim-style navigation — hands never leave the keyboard |
## Features
- **Built-in File Explorer** — Browse directories and open files without leaving the TUI
- **Unified Timeline View** — Load many DLT files and inspect them together in timestamp order
- **Log Table View** — ECU ID, APP ID, CTX ID, Source file, Log Level, Timestamp, and Payload at a glance
- **Log Detail and Hex Dump** — Inspect raw payload bytes for deep protocol analysis
- **Color-coded Log Levels** — Fatal (red), Error (light red), Warn (yellow), Info (green), Debug (blue), Verbose (gray)
- **Real-time Filtering** — Stack multiple filters to isolate exactly what you need:
- `/` — Regex text search across payloads
- `l` — Filter by minimum log level
- `a` — Filter by APP ID
- `c` — Filter by CTX ID
- `C` — Clear all filters instantly
- **Live TCP Connection** — Connect directly to a running dlt-daemon for real-time log streaming
- **Compression Support** — Directly open `.gz` and `.zip` compressed DLT files
- **Security Hardened** — Zip bomb protection (500MB limit), terminal injection sanitization
## Quick Start
### Install from crates.io
```bash
cargo install dlt-tui
```
### Or build from source
```bash
git clone https://github.com/tkmsikd/dlt-tui.git
cd dlt-tui
cargo build --release
```
### Run
```bash
# Open file explorer in current directory
dlt-tui
# Open a specific directory
dlt-tui /path/to/log/directory/
# Directly open one or multiple DLT files as a unified timeline
dlt-tui /path/to/log1.dlt /path/to/log2.dlt.gz
# Connect to a running dlt-daemon over TCP
dlt-tui --connect localhost:3490
# Typical ADB workflow for IVI development
adb forward tcp:3490 tcp:3490
dlt-tui --connect localhost:3490
```
## Keybindings
### File Explorer
| `j` / `Down` | Move down |
| `k` / `Up` | Move up |
| `Ctrl+f` / `Page Down` | Page down |
| `Ctrl+b` / `Page Up` | Page up |
| `Ctrl+d` | Half page down |
| `Ctrl+u` | Half page up |
| `g` / `Home` | Jump to top |
| `G` / `End` | Jump to bottom |
| `Enter` | Open directory / Load file |
| `b` | Batch load all files in dir |
| `q` | Quit |
### Log Viewer
| `j` / `Down` | Scroll down |
| `k` / `Up` | Scroll up |
| `Ctrl+f` / `Page Down` | Page down |
| `Ctrl+b` / `Page Up` | Page up |
| `Ctrl+d` | Half page down |
| `Ctrl+u` | Half page up |
| `Left` / `Right` | Scroll payload horizontally |
| `Shift+Left`/`Right` | Scroll payload horizontally fast |
| `g` / `Home` | Jump to first log |
| `G` / `End` | Jump to last log |
| `Enter` | Open detail view with hex dump |
| `/` | Search text (regex supported) |
| `l` | Filter by log level (F/E/W/I/D/V) |
| `a` | Filter by APP ID |
| `c` | Filter by CTX ID |
| `C` | Clear all filters |
| `S` | Save filter block to `.dlt-tui.toml` |
| `L` | Load filter block from `.dlt-tui.toml` |
| `F` | Toggle auto-scroll (tail mode) |
| `t` | Toggle delta time ($\Delta$t) |
| `E` | Export filtered logs to file |
| `q` / `Esc` | Back to File Explorer |
### Log Detail
| `j` / `k` | Navigate between log entries |
| `q` / `Esc` | Back to Log Viewer |
In any filter input mode, press `Enter` to apply or `Esc` to cancel and reset the filter.
## Use Cases
### ECU Bring-Up and Debugging
SSH into your target hardware and inspect DLT logs on the spot — no need to copy files back to your workstation.
```bash
ssh ecu-bench "cat /var/log/dlt/*.dlt" > combined.dlt && dlt-tui combined.dlt
```
### CI / Test Bench Pipeline
Integrate log inspection into your CI pipeline. When a test fails, quickly triage the issue:
```bash
dlt-tui ./test-results/ecu_log_$(date +%Y%m%d).dlt.gz
```
### Quick Triage with Compound Filters
Stack filters to isolate exactly what you need:
1. Press `l`, type `W`, press `Enter` (show warnings and above only)
2. Press `a`, type `DIAG`, press `Enter` (narrow to diagnostics module)
3. Press `/`, type `CAN`, press `Enter` (find CAN-related messages)
4. Press `Enter` on a suspicious log to inspect the hex dump
## Roadmap
- [x] Page-up / Page-down scrolling
- [x] Horizontal scroll for long payloads
- [ ] Bookmarking and log annotation
- [x] Saved filter configurations (`.dlt-tui.toml`)
- [x] Multi-file / directory batch loading
- [x] Unified timestamp timeline across loaded files
- [x] Timestamp delta display between messages
- [ ] DLT lifecycle and session tracking
- [x] Export filtered logs to file
- [ ] Plugin system for custom decoders (SOME/IP, UDS, etc.)
## Contributing
Contributions are welcome. See [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines.
```bash
git clone https://github.com/tkmsikd/dlt-tui.git
cd dlt-tui
cargo test
```
## License
This project is licensed under the [MIT License](LICENSE).