add compose_version_str function

Change-Id: Id1944627b2ec5cf450c978f77002c72d46206572

diff --git a/gbp/rpm/__init__.py b/gbp/rpm/__init__.py
index 4c5c22b..d47fb30 100644 (file)
--- a/gbp/rpm/__init__.py
+++ b/gbp/rpm/__init__.py
@@ -901,5 +901,34 @@ def string_to_int(val_str):
     else:
         return int(val_str)
 
-
+def compose_version_str(evr):
+    """
+    Compose a full version string from individual "version components",
+    i.e. epoch, version and release
+
+    @param evr: dict of version components
+    @type evr: C{dict} of C{str}
+    @return: full version
+    @rtype: C{str}
+
+    >>> compose_version_str({'epoch': '', 'upstreamversion': '1.0'})
+    '1.0'
+    >>> compose_version_str({'epoch': '2', 'upstreamversion': '1.0', 'release': None})
+    '2:1.0'
+    >>> compose_version_str({'epoch': None, 'upstreamversion': '1', 'release': '0'})
+    '1-0'
+    >>> compose_version_str({'epoch': '2', 'upstreamversion': '1.0', 'release': '2.3'})
+    '2:1.0-2.3'
+    >>> compose_version_str({'epoch': '2', 'upstreamversion': '', 'release': '2.3'})
+    """
+    if 'upstreamversion' in evr and evr['upstreamversion']:
+        version = ""
+        if 'epoch' in evr and evr['epoch']:
+            version += "%s:" % evr['epoch']
+        version += evr['upstreamversion']
+        if 'release' in evr and evr['release']:
+            version += "-%s" % evr['release']
+        if version:
+            return version
+    return None
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