location: add all.py, using takeout/gpslogger/ip (#237)

* location: add all.py, using takeout/gpslogger/ip, update docs

my/location/via_ip.py

@@ -0,0 +1,39 @@
+"""
+Converts IP addresses provided by my.location.ip to estimated locations
+"""
+
+REQUIRES = ["git+https://github.com/seanbreckenridge/ipgeocache"]
+
+from my.core import dataclass, Stats
+from my.config import location
+
+
+@dataclass
+class config(location.via_ip):
+    # no real science to this, just a guess of ~15km accuracy for IP addresses
+    accuracy: float = 15_000.0
+
+
+from typing import Iterator
+
+from .common import Location
+from my.ip.all import ips
+
+
+def locations() -> Iterator[Location]:
+    for ip in ips():
+        loc: str = ip.ipgeocache()["loc"]
+        lat, _, lon = loc.partition(",")
+        yield Location(
+            lat=float(lat),
+            lon=float(lon),
+            dt=ip.dt,
+            accuracy=config.accuracy,
+            elevation=None,
+        )
+
+
+def stats() -> Stats:
+    from my.core import stat
+
+    return {**stat(locations)}