docs: config docs

README.md

@@ -1,13 +1,9 @@
 # crypto
-Get your current holding in crypto from CoinGecko in your own currency.
+Get the `value` of one+ `coin` from CoinGecko in the `currency` of your
+`choice`.
 
 ## How-To
-Set your coins, your currency and the format you want the output in crypto
-You can get a list of valid id with:
-```console
-$ curl https://api.coingecko.com/api/v3/coins/list
-```
-
+Set the `COINS`, `CURRENCY` and `FORMAT` you want in `crypto`.
 ```console
 $ ./crypto
 ```

crypto

@@ -3,24 +3,25 @@
 import json
 import requests
 
+# curl https://api.coingecko.com/api/v3/coins/list
 COINS = [
 #   [id,        symbol]
     ["bitcoin", "BTC"],
 ]
-CUR = "usd"
-FMT = "{coin}=${price:.0f}"
+CURRENCY = "usd"
+FORMAT = "{coin}=${price:.0f}"
 
 
 def main():
     coin_ids = ",".join([coin for coin in list(zip(*COINS))[0]])
-    url = f"https://api.coingecko.com/api/v3/simple/price?ids={coin_ids}&vs_currencies={CUR}"
+    url = f"https://api.coingecko.com/api/v3/simple/price?ids={coin_ids}&vs_currencies={CURRENCY}"
 
     # {'bitcoin': {'usd': 69420}}
     prices = json.loads(requests.get(url).text)
 
     print(
         *[
-            FMT.format(coin=coin[1], price=prices[coin[0]][CUR])
+            FORMAT.format(coin=coin[1], price=prices[coin[0]][CURRENCY])
             for coin in COINS
         ]
     )