New group_by_latest_versions() function

xolox · Jun 25, 2014 · 7f0b409 · 7f0b409
1 parent 2d04b1d
commit 7f0b409
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Showing 2 changed files with 18 additions and 3 deletions.
diff --git a/deb_pkg_tools/__init__.py b/deb_pkg_tools/__init__.py
@@ -1,11 +1,11 @@
 # Debian packaging tools.
 #
 # Author: Peter Odding <peter@peterodding.com>
-# Last Change: June 22, 2014
+# Last Change: June 25, 2014
 # URL: https://github.com/xolox/python-deb-pkg-tools
 
 # Semi-standard module versioning.
-__version__ = '1.22.6'
+__version__ = '1.23'
 
 debian_package_dependencies = (
     'apt',        # apt-get

diff --git a/deb_pkg_tools/package.py b/deb_pkg_tools/package.py
@@ -1,7 +1,7 @@
 # Debian packaging tools: Package manipulation.
 #
 # Author: Peter Odding <peter@peterodding.com>
-# Last Change: June 15, 2014
+# Last Change: June 25, 2014
 # URL: https://github.com/xolox/python-deb-pkg-tools
 
 """
@@ -225,6 +225,21 @@ def find_latest_version(packages):
         raise ValueError(msg % concatenate(sorted(names)))
     return packages[-1]
 
+def group_by_latest_versions(packages):
+    """
+    Group package archives by name of package and find latest version of each.
+
+    :param packages: A list of filenames (strings) and/or
+                     :py:class:`PackageFile` objects.
+    :returns: A dictionary with package names as keys and
+              :py:class:`PackageFile` objects as values.
+    """
+    grouped_packages = collections.defaultdict(set)
+    for value in packages:
+        package = parse_filename(value)
+        grouped_packages[package.name].add(package)
+    return dict((n, find_latest_version(p)) for n, p in grouped_packages.items())
+
 def inspect_package(archive, cache=None):
     """
     Get the metadata and contents from a ``*.deb`` archive.