Add bump() implementation for GentooVersion

src/univers/gentoo.py

@@ -181,3 +181,38 @@ 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 string 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)
+    if ":" in ver:
+        ver = ver.split(":")[0]
+    if ver.endswith("*"):
+        ver = ver[:-1]
+
+    version, _ = parse_version_and_revision(ver)
+
+    base = version.split("_")[0]
+    segments = base.split(".")
+
+    if segments and segments[-1] and segments[-1][-1].isalpha():
+        segments[-1] = segments[-1][:-1]
+
+    int_segments = [int(s) for s in segments if s]
+
+    if not int_segments:
+        return None
+
+    if len(int_segments) > 1:
+        int_segments.pop()
+
+    int_segments[-1] += 1
+    return ".".join(str(s) for s in int_segments)

src/univers/versions.py

@@ -429,6 +429,10 @@ def __gt__(self, other):
             return NotImplemented
         return gentoo.vercmp(self.value, other.value) == 1
 
+    def bump(self):
+        bumped = gentoo.bump(self.value)
+        return self.__class__(bumped) if bumped else None
+
 
 class AlpineLinuxVersion(GentooVersion):
     @classmethod

tests/test_gentoo.py

@@ -31,3 +31,22 @@ 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() == GentooVersion("2.24")
+    assert GentooVersion("2.24.3").bump() == GentooVersion("2.25")
+    assert GentooVersion("2.25.4").bump() == GentooVersion("2.26")
+    assert GentooVersion("2.26.2").bump() == GentooVersion("2.27")
+    assert GentooVersion("1.0.5").bump() == GentooVersion("1.1")
+    assert GentooVersion("5.3").bump() == GentooVersion("6")
+    assert GentooVersion("5").bump() == GentooVersion("6")
+    assert GentooVersion("1.3.8b").bump() == GentooVersion("1.4")
+    assert GentooVersion("9.9_p2").bump() == GentooVersion("10")
+    assert GentooVersion("0.13.4-r2").bump() == GentooVersion("0.14")
+    assert GentooVersion("2.23.3-r1").bump() == GentooVersion("2.24")
+    # Handling slots and wildcards during bump
+    from univers import gentoo
+
+    assert gentoo.bump("3.24.48:3") == "3.25"
+    assert gentoo.bump("1.3*") == "2"