shoveler 0.2.2

Shoveler: A desktop SQL workbench for DuckDB

Shoveler - A DuckDB Workbench

A minimal desktop SQL workbench for DuckDB, built with Python and PySide6.

Named after the Australasian shoveler - a species of "dabbling duck" - in honor of both the database's name and the app's purpose.

Setup (uv)

git clone https://github.com/mrmatho/shoveler
cd shoveler
uv sync

uv sync creates a .venv, installs all dependencies including the dev group, and respects uv.lock if it exists. Run it again after pulling changes.

Running

uv run python -m shoveler

Testing

uv run pytest

Configuration layout

Shoveler now keeps most theme and UI configuration out of the widget classes.

• Theme stylesheets live in src/shoveler/assets/themes/ as .qss files.
• Structured configuration lives in src/shoveler/config/.
• theme.py loads and normalizes app themes.
• syntax.py contains SQL highlighting keywords and per-theme editor colors.
• ui.py contains shared UI constants such as status colors and path thresholds.
• text.py contains user-facing labels, tooltips, dialog text, and status message helpers.

When adding a new theme, update both the .qss assets and the relevant per-theme values in src/shoveler/config/ so editor syntax, status colors, and other theme-aware UI elements stay in sync.

Usage

• Open File — connect to an existing .duckdb or .db file (green indicator)
• New In-Memory — scratch database; data is lost when closed (amber indicator)
• File > Save Database As... — save current database state to a .duckdb file
• Checkpoint — flush the write-ahead log to disk (file databases only)
• F5 or Ctrl+Enter — run query
• Select part of your SQL to run only that selection
• Double-click a table name in the schema panel to insert it into the editor
• View > Syntax highlighting — toggle SQL highlighting on or off; enabled by default and remembered between launches
• View > Zoom — increase, decrease, or reset font size for the editor and results panel
  • Editor: Ctrl+=, Ctrl+-, Ctrl+0
  • Results: Ctrl+Shift+=, Ctrl+Shift+-, Ctrl+Shift+0

Documentation (Phase 1)

Basic user docs are available in the docs/ folder:

• Docs Home
• Quickstart (10 minutes)
• Core Concepts
• Troubleshooting

Publish with GitHub Pages

For a simple setup:

1. Go to repository Settings > Pages.
2. Under Build and deployment, set Source to Deploy from a branch.
3. Choose branch main and folder /docs.
4. Save.

GitHub Pages will publish the docs automatically from the docs/ directory.

Building a standalone Windows executable

The project includes shoveler.spec with the correct PyInstaller configuration. Use this rather than running pyinstaller with flags directly — the spec handles a non-obvious issue with DuckDB's compiled extension.

uv run pyinstaller shoveler.spec

Output is in dist/Shoveler/. Distribute that folder as a zip.

Building and publishing desktop binaries with GitHub Actions

This repo includes a release workflow at .github/workflows/desktop-release.yml.

• Trigger: push a tag like v1.2.0 (or run manually with workflow_dispatch).
• Build matrix: Windows, macOS, Linux.
• Output artifacts:
  • Shoveler-windows-x64.zip
  • Shoveler-macos-universal.zip
  • Shoveler-linux-x64.tar.gz
• Release publish: on tag pushes, artifacts are attached automatically to the GitHub Release.

Release steps

1. Update version/changelog as needed.
2. Create and push a version tag:

git tag v1.2.0
git push origin v1.2.0

1. Wait for the Desktop Release workflow to finish.
2. Open the matching GitHub Release and verify all three artifacts are attached.

Why --onedir and not --onefile? --onefile extracts everything to a temp directory on every launch, which makes startup noticeably slow for a PySide6 app. --onedir is faster and easier to debug if something goes wrong.

Known PyInstaller issue with DuckDB: DuckDB's compiled core (_duckdb.pyd on Windows) lives outside the duckdb/ package directory. PyInstaller does not find it automatically. The spec file uses collect_all('duckdb') which handles this correctly. If you ever regenerate the spec from scratch, make sure this is included or the packaged app will fail to start.

Extending

Feature	Where to add it
More export formats	Add menu items in ResultsPanel._show_export_menu() — raw data is in _last_rows / _last_columns
Results table badges	Update ResultsPanel._populate_table() and keep export using _last_rows / _last_columns only; badge text comes from QueryResult.column_types