Add README

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-26 15:44:50 +02:00
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+# prompt-gen
+
+A local web app for building and reusing prompt templates. Write a prompt once with `{{variable}}` placeholders, save it as a preset, then fill in the fields to generate new prompts on demand.
+
+![prompt-gen screenshot](https://via.placeholder.com/800x400?text=prompt-gen)
+
+## Features
+
+- **Presets** — save any number of named templates with descriptions
+- **Live variable filling** — input fields are generated automatically from `{{variable_name}}` placeholders in your template
+- **AI rewrite** — send the filled prompt to GPT for improvement with one click
+- **Persistent storage** — everything saved to a local `settings.json`, no database
+
+## Quick start (Docker)
+
+```bash
+docker compose up --build
+```
+
+Open [http://localhost:8000](http://localhost:8000).
+
+Data persists in a Docker named volume. To back it up:
+
+```bash
+docker compose cp app:/app/data/settings.json ./settings.json
+```
+
+## Quick start (local dev)
+
+**Requirements:** Python 3.11+, Node 18+
+
+```bash
+# Install dependencies
+pip install -r requirements.txt
+cd frontend && npm install && npm run build && cd ..
+
+# Run
+uvicorn backend.main:app --host 127.0.0.1 --port 8001
+```
+
+Open [http://localhost:8001](http://localhost:8001).
+
+### Hot-reload dev mode
+
+```bash
+# Terminal 1 — backend
+uvicorn backend.main:app --port 8001 --reload
+
+# Terminal 2 — frontend
+cd frontend && npm run dev
+```
+
+Frontend dev server runs on [http://localhost:5173](http://localhost:5173) and proxies `/api` to port 8001.
+
+## AI rewrite
+
+Click the ⚙ icon and enter your OpenAI API key. The key is stored in `settings.json` and never sent to the frontend. Once set, the **✦ Rewrite with AI** button becomes active in the prompt runner.
+
+The model defaults to `gpt-4.1`. Override it with the `OPENAI_MODEL` environment variable:
+
+```bash
+OPENAI_MODEL=gpt-4o uvicorn backend.main:app --port 8001
+# or in docker-compose.yml under environment:
+```
+
+## Template syntax
+
+Use `{{variable_name}}` anywhere in your template. Variable names must start with a letter or underscore and contain only letters, numbers, and underscores.
+
+```
+Resolve {{issue_id}} in {{repo}}. Create the PR as {{author}}.
+```
+
+Duplicate variable names collapse to a single input field. Variables appear in the order they first appear in the template.
+
+## Configuration
+
+All settings are stored in `settings.json` at the project root (or at `$SETTINGS_PATH` when set).
+
+```json
+{
+  "openai_api_key": "sk-...",
+  "presets": [
+    {
+      "id": "a1b2c3d4",
+      "name": "My template",
+      "description": "optional",
+      "template": "Resolve {{issue_id}} in {{repo}}.",
+      "variables": ["issue_id", "repo"],
+      "created_at": "2026-06-26T10:00:00Z",
+      "updated_at": "2026-06-26T10:00:00Z"
+    }
+  ]
+}
+```
+
+## API
+
+The FastAPI backend exposes a simple REST API at `/api`.
+
+| Method | Path | Description |
+|--------|------|-------------|
+| `GET` | `/api/presets` | List all presets |
+| `POST` | `/api/presets` | Create a preset |
+| `PUT` | `/api/presets/{id}` | Update a preset |
+| `DELETE` | `/api/presets/{id}` | Delete a preset |
+| `GET` | `/api/settings` | Check if OpenAI key is set |
+| `POST` | `/api/settings` | Save OpenAI API key |
+| `POST` | `/api/rewrite` | Rewrite a prompt with AI |
+
+Interactive docs available at [http://localhost:8001/docs](http://localhost:8001/docs) when running locally.
+
+## Stack
+
+- **Frontend** — React 18, Tailwind CSS v3, Vite
+- **Backend** — FastAPI, uvicorn
+- **Storage** — `settings.json` (flat file, no database)