Initial fit file parsing.

src/corchestrate/__init__.py

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+from corchestrate.measurement import Measurement

src/corchestrate/parse.py

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+from datetime import datetime
+from corchestrate.measurement import Measurement
+from garmin_fit_sdk import Stream, Decoder
+
+TO_DEGREES = 180 / (2**31)
+
+
+def from_fit_file_path(fit_file_path: str) -> list[Measurement]:
+    stream = Stream.from_file(fit_file_path)
+    decoder = Decoder(stream)
+    messages, _ = decoder.read()
+    records = messages["record_mesgs"]
+
+    def convert_to_measurement(record) -> Measurement:
+        measurement = Measurement(record.get("timestamp"))
+        measurement.heart_rate = record.get("heart_rate")
+        measurement.speed = record.get("enhanced_speed")
+        measurement.cadence = record.get("cadence")
+        measurement.power = record.get("power")
+        measurement.respiration_rate = record.get("respiration_rate")
+        measurement.temperature = record.get("temperature")
+        measurement.latitude = record.get(
+            "position_lat") * TO_DEGREES if "position_lat" in record else None
+        measurement.longitude = record.get(
+            "position_long"
+        ) * TO_DEGREES if "position_long" in record else None
+        measurement.elevation = record.get("enhanced_altitude")
+        return measurement
+
+    dummy = datetime.fromordinal(1)
+
+    def has_timestamp(record) -> bool:
+        return type(record.get("timestamp")) == type(dummy)
+
+    return [
+        convert_to_measurement(record) for record in records
+        if has_timestamp(record)
+    ]