Repository: rbarrois/python-semanticversion

Issue:
Support compatible release clauses (~=)
Hi!
Here's an example:
```python
Spec('~=1.5.6') # results in a ValueError
```

https://www.python.org/dev/peps/pep-0440/#compatible-release

Discussion:

Patch:
diff --git a/CREDITS b/CREDITS
index 53fdef1..ca9a781 100644
--- a/CREDITS
+++ b/CREDITS
@@ -23,6 +23,7 @@ The project has received contributions from (in alphabetical order):
 * Michael Hrivnak <mhrivnak@hrivnak.org> (https://github.com/mhrivnak)
 * William Minchin <w_minchin@hotmail.com> (https://github.com/minchinweb)
 * Dave Hall <skwadhd@gmail.com> (https://github.com/skwashd)
+* Martin Ek <mail@ekmartin.com> (https://github.com/ekmartin)
 
 
 Contributor license agreement
diff --git a/semantic_version/base.py b/semantic_version/base.py
index 1504642..83a9c25 100644
--- a/semantic_version/base.py
+++ b/semantic_version/base.py
@@ -405,6 +405,7 @@ class SpecItem(object):
     KIND_NEQ = '!='
     KIND_CARET = '^'
     KIND_TILDE = '~'
+    KIND_COMPATIBLE = '~='
 
     # Map a kind alias to its full version
     KIND_ALIASES = {
@@ -412,7 +413,7 @@ class SpecItem(object):
         KIND_EMPTY: KIND_EQUAL,
     }
 
-    re_spec = re.compile(r'^(<|<=||=|==|>=|>|!=|\^|~)(\d.*)$')
+    re_spec = re.compile(r'^(<|<=||=|==|>=|>|!=|\^|~|~=)(\d.*)$')
 
     def __init__(self, requirement_string):
         kind, spec = self.parse(requirement_string)
@@ -468,6 +469,12 @@ class SpecItem(object):
             return self.spec <= version < upper
         elif self.kind == self.KIND_TILDE:
             return self.spec <= version < self.spec.next_minor()
+        elif self.kind == self.KIND_COMPATIBLE:
+            if self.spec.patch:
+                upper = self.spec.next_minor()
+            else:
+                upper = self.spec.next_major()
+            return self.spec <= version < upper
         else:  # pragma: no cover
             raise ValueError('Unexpected match kind: %r' % self.kind)
 


Test patch:
diff --git a/tests/test_base.py b/tests/test_base.py
index 24bf86e..0675b24 100755
--- a/tests/test_base.py
+++ b/tests/test_base.py
@@ -514,6 +514,14 @@ class SpecItemTestCase(unittest.TestCase):
             ['0.0.2', '0.0.2-alpha', '0.0.2+abb'],
             ['0.1.0', '0.0.3', '1.0.0'],
         ),
+        '~=1.4.5': (
+            ['1.4.5', '1.4.10-alpha', '1.4.10'],
+            ['1.3.6', '1.4.4', '1.5.0'],
+        ),
+        '~=1.4': (
+            ['1.4.0', '1.6.10-alpha', '1.6.10'],
+            ['1.3.0', '2.0.0'],
+        ),
     }
 
     def test_matches(self):
diff --git a/tests/test_match.py b/tests/test_match.py
index 49464f8..4d1a96f 100755
--- a/tests/test_match.py
+++ b/tests/test_match.py
@@ -31,6 +31,7 @@ class MatchTestCase(unittest.TestCase):
         '!=0.1.2-rc1.3-14.15+build.2012-01-01.11h34',
         '^0.1.2',
         '~0.1.2',
+        '~=0.1.2',
     ]
 
     matches = {
@@ -113,6 +114,16 @@ class MatchTestCase(unittest.TestCase):
             '0.1.2+build4.5',
             '0.1.3-rc1.3',
         ],
+        '~=1.4.5': (
+            '1.4.5',
+            '1.4.10-alpha',
+            '1.4.10',
+        ),
+        '~=1.4': [
+            '1.4.0',
+            '1.6.10-alpha',
+            '1.6.10',
+        ],
     }
 
     def test_invalid(self):