pydot: fix upstream issue pydot/pydot#277

dev-python/pydot/Manifest

@@ -0,0 +1 @@
+DIST pydot-1.4.2.tar.gz 272678 BLAKE2B 966f2c4ef3e26a63cc50ab89b5b6b5b413aabdfeddf994f2d5ba9dedaa1ed3152dd8060186e7380c3e768b783f7bfe1971cd600c18d1b73f7ac63db08ee3ace9 SHA512 caa8051561710129b5164fd1392da941829fd977092a6ec8b00efe7a199d2d60bc7ef13cb0e51615f384550f0fb80190d0f56b83d8d80d1fe372efb5dbbd3632

dev-python/pydot/files/281.patch

@@ -0,0 +1,11 @@
+--- a/dot_parser.py.orig	2021-02-15 21:19:47.000000000 +0800
++++ b/dot_parser.py	2022-01-04 16:16:24.522390705 +0800
+@@ -439,6 +439,8 @@
+
+         noncomma = "".join([c for c in printables if c != ","])
+         alphastring_ = OneOrMore(CharsNotIn(noncomma + ' '))
++        # override pyparsing tightened whitespace-skipping logic
++        alphastring_.skipWhitespace = True
+
+         def parse_html(s, loc, toks):
+             return '<%s>' % ''.join(toks[0])

dev-python/pydot/pydot-1.4.2-r2.ebuild

@@ -0,0 +1,38 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+PYTHON_COMPAT=( python3_{8..10} )
+
+inherit distutils-r1
+
+DESCRIPTION="Python interface to Graphviz's Dot language"
+HOMEPAGE="https://github.com/pydot/pydot https://pypi.org/project/pydot/"
+# pypi releases don't include tests
+SRC_URI="https://github.com/pydot/pydot/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="~alpha amd64 arm ~arm64 ~hppa ~ia64 ~mips ppc ppc64 ~riscv ~s390 sparc x86 ~amd64-linux ~ppc-macos ~x64-macos ~sparc-solaris"
+IUSE="test"
+RESTRICT="!test? ( test )"
+
+# See https://github.com/pydot/pydot/issues/277 for pyparsing dep
+RDEPEND="
+	>=dev-python/pyparsing-3[${PYTHON_USEDEP}]
+	media-gfx/graphviz"
+BDEPEND="
+	test? (
+		${RDEPEND}
+		dev-python/chardet[${PYTHON_USEDEP}]
+	)"
+
+python_test() {
+	cd test || die
+	"${PYTHON}" pydot_unittest.py || die "Test failed with ${EPYTHON}"
+}
+
+#https://github.com/pydot/pydot/issues/277
+PATCHES=(
+	"${FILESDIR}"/281.patch
+)