Fix UnicodeEncodeError exception handling (#160) (#163)

* Fix UnicodeEncodeError exception handling (#160)

When build_cache() encounters a UnicodeEncodeError, the original code
did not escape unprintable chars and caused the cache build to fail.
This patch fixes the code so that the culprit is correctly printed in
debug mode.

* Incrementing version string (1.2.1 -> 1.2.2)

* Reformatted code using pyblack

---------

Co-authored-by: Marc Zuo <[email protected]>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "dmenu_extended"
-version = "1.2.3"
+version = "1.2.4"
 authors = [
   { name="Mark Hedley Jones", email="[email protected]" },
 ]

src/dmenu_extended/main.py

@@ -786,11 +786,14 @@ def cache_save(self, items, path):
             for item in items:
                 clean = True
                 for char in item:
-                    if char not in string.printable:
+                    if not str.isprintable(char):
                         clean = False
                         foundError = True
                         if self.debug:
-                            print("Culprit: " + item)
+                            print(
+                                "Culprit: "
+                                + item.encode("unicode_escape").decode("utf-8")
+                            )
                 if clean:
                     tmp.append(item)
             if foundError:
@@ -802,7 +805,7 @@ def cache_save(self, items, path):
                     print("Offending items have been excluded from cache")
                 with open(path, "wb") as f:
                     for item in tmp:
-                        f.write(item + "\n")
+                        f.write(item.encode("unicode_escape") + b"\n")
                 return 2
             else:
                 if self.debug: