From 76d268a38c627bf4aebebcd064f5b6d380eb8b20 Mon Sep 17 00:00:00 2001
From: Alex Gaynor <alex.gaynor@gmail.com>
Date: Tue, 1 Sep 2015 07:21:10 -0400
Subject: [PATCH] Fixed #42 -- use a user cache directory

---
 rply/parsergenerator.py | 46 ++++++++++++++---------------------------
 setup.py                |  1 +
 2 files changed, 17 insertions(+), 30 deletions(-)

diff --git a/rply/parsergenerator.py b/rply/parsergenerator.py
index f2ed8ee..995f78e 100644
--- a/rply/parsergenerator.py
+++ b/rply/parsergenerator.py
@@ -8,6 +8,8 @@
 import tempfile
 import warnings
 
+from appdirs import AppDirs
+
 from rply.errors import ParserGeneratorError, ParserGeneratorWarning
 from rply.grammar import Grammar
 from rply.parser import LRParser
@@ -175,44 +177,28 @@ def build(self):
         g.compute_first()
         g.compute_follow()
 
-        # win32 temp directories are already per-user
-        if os.name == "nt":
-            cache_file = os.path.join(
-                tempfile.gettempdir(),
-                "rply-%s-%s-%s.json" % (
-                    self.VERSION, self.cache_id, self.compute_grammar_hash(g)
-                )
-            )
-        else:
-            cache_file = os.path.join(
-                tempfile.gettempdir(),
-                "rply-%s-%s-%s-%s.json" % (
-                    self.VERSION,
-                    os.getuid(),
-                    self.cache_id,
-                    self.compute_grammar_hash(g)
-                )
+        cache_dir = AppDirs("rply").user_cache_dir
+        cache_file = os.path.join(
+            cache_dir,
+            "rply-%s-%s-%s.json" % (
+                self.VERSION, self.cache_id, self.compute_grammar_hash(g)
             )
+        )
+
         table = None
         if os.path.exists(cache_file):
             with open(cache_file) as f:
                 data = json.load(f)
-                stat_result = os.fstat(f.fileno())
-            if (
-                os.name == "nt" or (
-                    stat_result.st_uid == os.getuid() and
-                    stat.S_IMODE(stat_result.st_mode) == 0o0600
-                )
-            ):
-                if self.data_is_valid(g, data):
-                    table = LRTable.from_cache(g, data)
+            if self.data_is_valid(g, data):
+                table = LRTable.from_cache(g, data)
         if table is None:
             table = LRTable.from_grammar(g)
-            fd = os.open(
-                cache_file, os.O_RDWR | os.O_CREAT | os.O_EXCL, 0o0600
-            )
-            with os.fdopen(fd, "w") as f:
+            if not os.path.exists(cache_dir):
+                os.makedirs(cache_dir)
+
+            with open(cache_file, "w") as f:
                 json.dump(self.serialize_table(table), f)
+
         if table.sr_conflicts:
             warnings.warn(
                 "%d shift/reduce conflict%s" % (
diff --git a/setup.py b/setup.py
index df6af7e..1072f5e 100644
--- a/setup.py
+++ b/setup.py
@@ -13,4 +13,5 @@
     author="Alex Gaynor",
     author_email="alex.gaynor@gmail.com",
     packages=["rply"],
+    install_requires=["appdirs"],
 )