cg-common 0.2.1

Shared library for CoinGecko CLI tools - HTTP client with rate limiting, retry logic, symbol resolution, and output writers
Documentation 
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# cg-common

Shared infrastructure library for CoinGecko and crypto data CLI tools.

## Features

- **HTTP Client** - Async client with automatic rate limiting and retry
- **Rate Limiting** - Governor-based rate limiter (10 req/min default for CoinGecko free tier)
- **Retry Logic** - Exponential backoff with special handling for 429 rate limits
- **Symbol Resolution** - Maps crypto symbols (BTC, ETH) to CoinGecko IDs (bitcoin, ethereum)
- **Output Writers** - JSON and CSV writers with pretty-print support

## Usage

```rust
use cg_common::{CoinGeckoClientBuilder, resolve_symbol, JsonWriter};

// Build HTTP client with rate limiting
let client = CoinGeckoClientBuilder::new()
    .with_rate_limit(10)  // 10 requests per minute
    .build()?;

// Resolve symbol to CoinGecko ID
let id = resolve_symbol("BTC");  // Returns "bitcoin"

// Make API request (auto-retries on 429)
let response = client.get("/coins/bitcoin").await?;

// Write JSON output
let writer = JsonWriter::new(Some("output.json".into()), true);
writer.write(&data)?;
```

## Supported Symbols

50+ pre-mapped symbols including:

| Symbol | CoinGecko ID |
|--------|--------------|
| BTC | bitcoin |
| ETH | ethereum |
| SOL | solana |
| XRP | ripple |
| DOGE | dogecoin |
| ADA | cardano |
| ... | ... |

Use `resolve_symbol()` to convert any symbol, or pass CoinGecko IDs directly.

## Rate Limiting

The client implements conservative rate limiting for CoinGecko's free tier:
- Default: 10 requests/minute
- Automatic retry on 429 with 30s/60s/120s backoff
- Configurable via `with_rate_limit()`

## License

MIT