Sanitize county name

The ministry sadly does some horrid stuff to their HTML
and has implemented hyphenation manually, leading to
some county names now being split in weird ways after
extraction.

The following replacements takes place:

  * "- <upper case letter>" -> "-<upper case letter>"
  * "- <lower case letter>" -> "<lower case letter>"

custom_components/coronavirus_hessen/__init__.py

@@ -2,6 +2,7 @@
 
 from datetime import timedelta
 import logging
+import re
 
 import async_timeout
 import asyncio
@@ -19,6 +20,8 @@
 
 PLATFORMS = ["sensor"]
 
+HYPHEN_PATTERN = re.compile(r"- (.)")
+
 async def async_setup(hass: HomeAssistant, config: dict):
     """Set up the Coronavirus Hessen component."""
     # Make sure coordinator is initialized.
@@ -87,8 +90,10 @@ async def async_get_data():
                 _LOGGER.exception("Error processing line {}, skipping".format(line))
                 continue
 
+            county = sanitize_county(county)
             if county == "Gesamtergebnis":
                 county = OPTION_TOTAL
+
             result[county] = dict(cases=cases, hospitalized=hospitalized, deaths=deaths)
 
         _LOGGER.debug("Corona Hessen: {!r}".format(result))
@@ -109,3 +114,37 @@ def parse_num(s, t=int):
     if len(s) and s != "-":
         return t(s.replace(".", "").replace(",", "."))
     return 0
+
+def sanitize_county(county):
+    """
+    Sanitizes the county.
+
+    The ministry sadly does some horrid stuff to their HTML
+    and has implemented hyphenation manually, leading to
+    some county names now being split in weird ways after
+    extraction.
+
+    The following replacements takes place:
+
+      * "- <upper case letter>" -> "-<upper case letter>"
+      * "- <lower case letter>" -> "<lower case letter>"
+    
+    Examples:
+
+        >>> sanitize_county("LK Main-Kinzig- Kreis")
+        <<< "LK Main-Kinzig-Kreis"
+        >>> sanitize_county("LK Wetterau- kreis")
+        <<< "LK Wetteraukreis"
+        >>> sanitize_county("SK Frankfurt am Main")
+        <<< "SK Frankfurt am Main"
+    """
+
+    def replace(m):
+        letter = m.group(1)
+        if letter.islower():
+            return letter
+        else:
+            return "-{}".format(letter)
+
+    return HYPHEN_PATTERN.sub(replace, county)
+