Add support for Gentoo bump function

src/univers/gentoo.py

@@ -181,3 +181,27 @@ def vercmp(ver1, ver2):
     # Our versions had different strings but ended up being equal.
     # The revision holds the final difference.
     return cmp(rev1, rev2)
+
+
+def bump(ver):
+    """
+    Return a new version where the next to the last revision number
+    is one greater (e.g., 5.3.1 => 5.4) i.e., incrementing this GentooVersion
+    last numeric segment.
+    """
+
+    if not ver:
+        return None
+
+    ver = remove_spaces(ver)
+    version, _ = parse_version_and_revision(ver)
+
+    segments = version.split(".")
+    segments = [int(re.sub(r"\D", "", seg)) for seg in segments if seg]
+
+    if len(segments) > 1:
+        segments.pop()
+
+    segments[-1] += 1
+    segments = [str(r) for r in segments]
+    return ".".join(segments)

src/univers/versions.py

@@ -429,6 +429,9 @@ def __gt__(self, other):
             return NotImplemented
         return gentoo.vercmp(self.value, other.value) == 1
 
+    def bump(self):
+        return gentoo.bump(self.value)
+
 
 class AlpineLinuxVersion(GentooVersion):
     @classmethod

tests/test_gentoo.py

@@ -31,3 +31,12 @@ def comparison(self):
 def test_gentoo_vers_cmp(test_case):
     avc = GentooVersionComp.from_data(data=test_case)
     avc.assert_result()
+
+
+def test_gentoo_bump():
+    assert GentooVersion("2.23.3").bump() == "2.24"
+    assert GentooVersion("2.24.3").bump() == "2.25"
+    assert GentooVersion("2.25.4").bump() == "2.26"
+    assert GentooVersion("1.3.8b").bump() == "1.4"
+    assert GentooVersion("9.9_p2").bump() == "10"
+    assert GentooVersion("0.13.4-r2").bump() == "0.14"