chore: allow versionstrings with v prefix to be treated as version

Previously only versions on format X.Y.Z was allowed, all other
version strings would be treated as version 0.0.0. Now vX.Y.Z is
also allowed.

Refs: equinor/ecalc-internal#915

Author: tj098895

src/libecalc/common/version.py

@@ -29,6 +29,9 @@ def from_string(cls, version_string: str | None) -> "Version":
         if version_string is None:
             return cls()
 
+        if version_string.lower().startswith("v"):
+            version_string = version_string[1:]
+
         pattern = re.compile(VERSION_FORMAT)
         match = pattern.match(version_string)
 

tests/libecalc/common/test_version.py

@@ -16,6 +16,11 @@
     ("100", Version(100, 0, 0)),
     ("0", Version(0, 0, 0)),
     ("0.1.2", Version(0, 1, 2)),
+    ("v1.1.1", Version(1, 1, 1)),
+    ("v2025.10.0", Version(2025, 10, 0)),
+    ("v2025.10.10", Version(2025, 10, 10)),
+    ("master", Version(0, 0, 0)),
+    ("master-latest", Version(0, 0, 0)),
 ]