Basic sources and source commands.

src/pricehist/cli.py

@@ -2,12 +2,30 @@ import argparse
 import sys
 from datetime import datetime
 
-from pricehist.location import greet
+from pricehist import sources
 
 def cli(args=None):
     parser = build_parser()
     args = parser.parse_args()
 
+    if (args.command == 'sources'):
+        cmd_sources(args)
+    elif (args.command == 'source'):
+        cmd_source(args)
+    else:
+        parser.print_help()
+
+def cmd_sources(args):
+    width = max([len(identifier) for identifier in sources.by_id.keys()])
+    for identifier, source in sources.by_id.items():
+        print(f'{identifier.ljust(width)}  {source.name()}')
+
+def cmd_source(args):
+    source = sources.by_id[args.identifier]
+    print(f'ID   : {source.id()}')
+    print(f'Name : {source.name()}')
+    pass
+
 def build_parser():
     def valid_date(s):
         if s == 'today':
@@ -22,21 +40,27 @@ def build_parser():
     def today():
         return str(datetime.now().date())
 
-    parser = argparse.ArgumentParser(description='Fetch historical price data from CoinMarketCap.com.')
+    parser = argparse.ArgumentParser(description='Fetch historical price data')
 
-    parser.add_argument('identifier', metavar='ID', type=str,
-                        help='currency or coin identifier from URL (example: bitcoin-cash)')
+    subparsers = parser.add_subparsers(title='commands', dest='command')
 
-    parser.add_argument('--start', dest='start', type=valid_date,
-                        default='2009-01-03',
-                        help='start date (default: 2009-01-03)')
+    sources_parser = subparsers.add_parser('sources', help='list sources')
 
-    parser.add_argument('--end', dest='end', type=valid_date,
-                        default=today(),
-                        help='end date (default: today)')
+    source_parser = subparsers.add_parser('source', help='show source details')
+    source_parser.add_argument('identifier', metavar='ID', type=str,
+            choices=sources.by_id.keys(),
+            help='the source identifier')
 
-    parser.add_argument('--csv', dest='csv', action='store_true',
-                        help='print full data as csv (instead of Ledger pricedb format)')
+    # parser.add_argument('--start', dest='start', type=valid_date,
+    #                     default='2009-01-03',
+    #                     help='start date (default: 2009-01-03)')
+
+    # parser.add_argument('--end', dest='end', type=valid_date,
+    #                     default=today(),
+    #                     help='end date (default: today)')
+
+    # parser.add_argument('--csv', dest='csv', action='store_true',
+    #                     help='print full data as csv (instead of Ledger pricedb format)')
 
     return parser
 

src/pricehist/location.py

@@ -1,7 +0,0 @@
-"""Send greetings."""
-
-def greet(tz):
-    """Greet a location."""
-    friendly_time = "now"
-    location = tz.split("/")[-1].replace("_"," ")
-    return f"Hello, {location}! The time is {friendly_time}."

src/pricehist/sources/CoinMarketCap.py

@@ -0,0 +1,9 @@
+class CoinMarketCap():
+
+    @staticmethod
+    def id():
+        return 'coinmarketcap'
+
+    @staticmethod
+    def name():
+        return 'CoinMarketCap.com'

src/pricehist/sources/ECB.py

@@ -0,0 +1,10 @@
+class ECB():
+
+    @staticmethod
+    def id():
+        return 'ecb'
+
+    @staticmethod
+    def name():
+        return 'European Central Bank'
+

src/pricehist/sources/__init__.py

@@ -0,0 +1,7 @@
+from .CoinMarketCap import CoinMarketCap
+from .ECB import ECB
+
+by_id = {
+    CoinMarketCap.id(): CoinMarketCap,
+    ECB.id(): ECB
+}