patch_ng, new python recipe (#6527)

dev-python/patch-ng/patch_ng-1.17.4.recipe

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+SUMMARY="Library to parse and apply unified diffs"
+DESCRIPTION="Patch NG (New Generation)
+Why did we fork this project?
+
+This project is a fork from the original python-patch project.
+
+As any other project, bugs are common during the development process, the combination of issues + \
+pull requests are able to keep the constant improvement of a project.
+However, both community and author need to be aligned. When users, developers, the community, \
+needs a fix which are important for their projects, but there is no answer from the author, or the \
+time for response is not enough, then the most plausible way is forking and continuing a parallel \
+development.
+
+That's way we forked the original and accepted most of PRs waiting for review since jun/2019 (5 \
+months from now).
+
+Features
+ * Python 2 and 3 compatible
+ * Automatic correction of
+   ** Linefeeds according to patched file
+   ** Diffs broken by stripping trailing whitespace
+   ** a/ and b/ prefixes
+ * Single file, which is a command line tool and a library
+ * No dependencies outside Python stdlib
+ * Patch format detection (SVN, HG, GIT)
+ * Nice diffstat histogram
+ * Linux / Windows / OS X
+ * Test coverage
+
+Things that don't work out of the box:
+
+ * File renaming, creation and removal
+ * Directory tree operations
+ * Version control specific properties
+ * Non-unified diff formats."
+HOMEPAGE="https://github.com/conan-io/python-patch-ng"
+COPYRIGHT="2019-2020 Uilian Ries
+	2008-2019 Anatoly Techtonik"
+LICENSE="MIT"
+REVISION="1"
+SOURCE_URI="$HOMEPAGE/archive/refs/tags/$portVersion.tar.gz"
+CHECKSUM_SHA256="e332ea2c2e64e95b988c6e904a51be65b80560518a9b101c604a1a4378673795"
+SOURCE_DIR="python-patch-ng-$portVersion"
+
+ARCHITECTURES="all"
+
+PROVIDES="
+	$portName = $portVersion
+	"
+REQUIRES="
+	haiku
+	"
+
+BUILD_REQUIRES="
+	haiku_devel
+	"
+
+PYTHON_PACKAGES=(python3 python38 python39)
+PYTHON_VERSIONS=(3.7 3.8 3.9)
+for i in "${!PYTHON_PACKAGES[@]}"; do
+	pythonPackage=${PYTHON_PACKAGES[i]}
+	pythonVersion=${PYTHON_VERSIONS[$i]}
+	eval "PROVIDES_$pythonPackage=\"
+		${portName}_$pythonPackage = $portVersion
+		\""
+	eval "REQUIRES_$pythonPackage=\"
+		haiku
+		cmd:python$pythonVersion
+		\""
+BUILD_REQUIRES="$BUILD_REQUIRES
+	setuptools_$pythonPackage"
+BUILD_PREREQUIRES="$BUILD_PREREQUIRES
+	cmd:python$pythonVersion"
+done
+
+INSTALL()
+{
+	for i in "${!PYTHON_PACKAGES[@]}"; do
+		pythonPackage=${PYTHON_PACKAGES[i]}
+		pythonVersion=${PYTHON_VERSIONS[$i]}
+
+		python=python$pythonVersion
+		installLocation=$prefix/lib/$python/vendor-packages/
+		export PYTHONPATH=$installLocation:$PYTHONPATH
+		mkdir -p $installLocation
+		rm -rf build
+		$python setup.py build install \
+			--root=/ --prefix=$prefix
+
+		packageEntries  $pythonPackage \
+			$prefix/lib/python*
+	done
+}