Tidy logging.

src/pricehist/cli.py

@@ -8,19 +8,21 @@ from pricehist import __version__, outputs, sources
 from pricehist.fetch import fetch
 from pricehist.format import Format
 from pricehist.series import Series
+from pricehist import logger
 
 
 def cli(args=None, output_file=sys.stdout):
     start_time = datetime.now()
-    logging.basicConfig(format="%(message)s", level=logging.INFO)
+
+    logger.init()
 
     parser = build_parser()
     args = parser.parse_args()
 
     if args.debug:
-        logging.getLogger().setLevel(logging.DEBUG)
+        logger.show_debug()
     elif args.verbose:
-        logging.getLogger().setLevel(logging.INFO)
+        logger.show_info()
 
     logging.debug(f"Began pricehist run at {start_time}.")
 
@@ -49,8 +51,8 @@ def cli(args=None, output_file=sys.stdout):
             )
             if series.type not in source.types():
                 logging.critical(
-                    f"ERROR: The requested price type '{series.type}' is not "
+                    f"The requested price type '{series.type}' is not "
-                    f"recognised by the {source.id()} source!"
+                    f"recognized by the {source.id()} source!"
                 )
                 sys.exit(1)
             fmt = Format.fromargs(args)

src/pricehist/fetch.py

@@ -46,19 +46,19 @@ def _cov_description(
 
     if start_uncovered == 0 and end_uncovered > 0:
         return (
-            f"starting as requested and ending {end_uncovered} "
+            f"which ends {end_uncovered} day{s(end_uncovered)} earlier than "
-            f"day{s(end_uncovered)} earlier than requested"
+            f"requested"
         )
     elif start_uncovered > 0 and end_uncovered == 0:
         return (
-            f"starting {start_uncovered} day{s(start_uncovered)} later "
+            f"which starts {start_uncovered} day{s(start_uncovered)} later "
-            "than requested and ending as requested"
+            "than requested"
         )
     elif start_uncovered > 0 and end_uncovered > 0:
         return (
-            f"starting {start_uncovered} day{s(start_uncovered)} later "
+            f"which starts {start_uncovered} day{s(start_uncovered)} later "
-            f"and ending {end_uncovered} day{s(end_uncovered)} earlier "
+            f"and ends {end_uncovered} day{s(end_uncovered)} earlier "
-            "than requested"
+            f"than requested"
         )
     else:
         return "as requested"

src/pricehist/logger.py

@@ -0,0 +1,26 @@
+import logging
+import sys
+
+
+class Formatter(logging.Formatter):
+    def format(self, record):
+        message = record.msg % record.args
+        if record.levelno == logging.INFO:
+            return message
+        else:
+            return f"{record.levelname} {message}"
+
+
+def init():
+    handler = logging.StreamHandler(sys.stderr)
+    handler.setFormatter(Formatter())
+    logging.root.addHandler(handler)
+    logging.root.setLevel(logging.WARNING)
+
+
+def show_debug():
+    logging.root.setLevel(logging.DEBUG)
+
+
+def show_info():
+    logging.root.setLevel(logging.INFO)