python2.pkgs.pyparsing: keep 2.4.7

pkgs/development/python2-modules/pyparsing/default.nix

@@ -0,0 +1,45 @@
+{ buildPythonPackage
+, fetchFromGitHub
+, lib
+
+# since this is a dependency of pytest, we need to avoid
+# circular dependencies
+, jinja2
+, railroad-diagrams
+}:
+
+let
+  pyparsing = buildPythonPackage rec {
+    pname = "pyparsing";
+    version = "2.4.7";
+
+    src = fetchFromGitHub {
+      owner = "pyparsing";
+      repo = pname;
+      rev = "pyparsing_${version}";
+      sha256 = "14pfy80q2flgzjcx8jkracvnxxnr59kjzp3kdm5nh232gk1v6g6h";
+    };
+
+    # circular dependencies if enabled by default
+    doCheck = false;
+    checkInputs = [
+      jinja2
+      railroad-diagrams
+    ];
+
+    checkPhase = ''
+      python -m unittest
+    '';
+
+    passthru.tests = {
+      check = pyparsing.overridePythonAttrs (_: { doCheck = true; });
+    };
+
+    meta = with lib; {
+      homepage = "https://github.com/pyparsing/pyparsing";
+      description = "An alternative approach to creating and executing simple grammars, vs. the traditional lex/yacc approach, or the use of regular expressions";
+      license = licenses.mit;
+    };
+  };
+in
+  pyparsing

pkgs/top-level/python2-packages.nix

@@ -114,6 +114,8 @@ with self; with super; {
 
   pyjwt = callPackage ../development/python2-modules/pyjwt { };
 
+  pyparsing = callPackage ../development/python2-modules/pyparsing { };
+
   pyroma = callPackage ../development/python2-modules/pyroma { };
 
   pysqlite = callPackage ../development/python2-modules/pysqlite { };