Merge pull request #308 from dgrisham/feat/hash-file-for-cache-fname

Hash file for cache filename

2 files changed, 14 insertions, 3 deletions

diff --git a/pywal/colors.py b/pywal/colors.py
index a87ee4c..246318c 100644
--- a/pywal/colors.py
+++ b/pywal/colors.py
@@ -4,7 +4,6 @@ Generate a palette using various backends.
 import logging
 import os
 import random
-import re
 import sys
 
 from . import theme
@@ -86,9 +85,9 @@ def saturate_colors(colors, amount):
 def cache_fname(img, backend, light, cache_dir, sat=""):
     """Create the cache file name."""
     color_type = "light" if light else "dark"
-    file_name = re.sub("[/|\\|.]", "_", img)
+    file_hash = util.hashf(img)
 
-    file_parts = [file_name, color_type, backend, sat, __cache_version__]
+    file_parts = [file_hash, color_type, backend, sat, __cache_version__]
     return [cache_dir, "schemes", "%s_%s_%s_%s_%s.json" % (*file_parts,)]
 
 
diff --git a/pywal/util.py b/pywal/util.py
index 0557cc4..10fb42c 100644
--- a/pywal/util.py
+++ b/pywal/util.py
@@ -2,6 +2,7 @@
 Misc helper functions.
 """
 import colorsys
+import hashlib
 import json
 import logging
 import os
@@ -178,3 +179,14 @@ def get_pid(name):
         return False
 
     return True
+
+
+def hashf(fpath):
+    """Get the md5 hash of a file."""
+    return hashlib.md5(file_bytes(open(fpath, 'rb'))).hexdigest()
+
+
+def file_bytes(fpath):
+    """Helper function to read file."""
+    with fpath:
+        return fpath.read()