DescriptionCheck: check for description repeating package name

NEWS.rst

@@ -17,6 +17,9 @@ pkgcheck 0.10.40 (unreleased)
 - DescriptionCheck: check for descriptions ending with a full-stop  (Arthur
   Zamarin,  Michał Górny, #472)
 
+- DescriptionCheck: check for descriptions repeating package name  (Michał
+  Górny, #2021)
+
 
 **Packaging:**
 

src/pkgcheck/checks/metadata.py

@@ -1523,10 +1523,15 @@ class DescriptionCheck(Check):
     def feed(self, pkg):
         desc: str = pkg.description
         s = desc.lower()
+        lower_pn = pkg.package.lower()
         if s.startswith("based on") and "eclass" in s:
             yield BadDescription("generic eclass defined description", pkg_desc=desc, pkg=pkg)
-        elif s in (pkg.package.lower(), pkg.key.lower()):
+        elif s in (lower_pn, pkg.key.lower()):
             yield BadDescription("generic package description", pkg_desc=desc, pkg=pkg)
+        elif s.startswith(lower_pn) and s.removeprefix(lower_pn).startswith(
+            (" is", " -", ":", ",")
+        ):
+            yield BadDescription("repeats package name", pkg_desc=desc, pkg=pkg)
         elif desc.endswith(tuple(".,:;")) and not desc.lower().endswith(
             ("etc.", "co.", "inc.", "ltd.", "...")
         ):

testdata/data/repos/standalone/DescriptionCheck/BadDescription/expected.json

@@ -3,3 +3,4 @@
 {"__class__": "BadDescription", "category": "DescriptionCheck", "package": "BadDescription", "version": "2", "msg": "under 10 chars in length", "pkg_desc": "bad desc"}
 {"__class__": "BadDescription", "category": "DescriptionCheck", "package": "BadDescription", "version": "3", "msg": "generic package description", "pkg_desc": "BadDescription"}
 {"__class__": "BadDescription", "category": "DescriptionCheck", "package": "BadDescription", "version": "4", "msg": "over 80 chars in length", "pkg_desc": null}
+{"__class__": "BadDescription", "category": "DescriptionCheck", "package": "BadDescription", "version": "5", "msg": "repeats package name", "pkg_desc": "badDESCRIPTION is a test ebuild"}

testdata/data/repos/standalone/DescriptionCheck/BadDescription/fix.patch

@@ -42,3 +42,12 @@ diff -Naur standalone/DescriptionCheck/BadDescription/BadDescription-4.ebuild fi
  HOMEPAGE="https://github.com/pkgcore/pkgcheck"
  LICENSE="BSD"
  SLOT="0"
+diff -Naur standalone/DescriptionCheck/BadDescription/BadDescription-5.ebuild fixed/DescriptionCheck/BadDescription/BadDescription-5.ebuild
+--- standalone/DescriptionCheck/BadDescription/BadDescription-5.ebuild	2019-11-28 00:33:38.457040594 -0700
++++ fixed/DescriptionCheck/BadDescription/BadDescription-5.ebuild	2019-11-28 00:34:59.065514420 -0700
+@@ -1,4 +1,4 @@
+-DESCRIPTION="badDESCRIPTION is a test ebuild"
++DESCRIPTION="Test ebuild"
+ HOMEPAGE="https://github.com/pkgcore/pkgcheck"
+ LICENSE="BSD"
+ SLOT="0"

testdata/repos/standalone/DescriptionCheck/BadDescription/BadDescription-5.ebuild

@@ -0,0 +1,4 @@
+DESCRIPTION="badDESCRIPTION is a test ebuild"
+HOMEPAGE="https://github.com/pkgcore/pkgcheck"
+LICENSE="BSD"
+SLOT="0"