fix: create template pprint from repr implementation

django/template/defaultfilters.py

@@ -3,6 +3,7 @@
 import random as random_module
 import re
 import types
+from collections.abc import Sized
 from decimal import ROUND_HALF_UP, Context, Decimal, InvalidOperation, getcontext
 from functools import wraps
 from inspect import unwrap
@@ -16,6 +17,7 @@ from django.utils.html import avoid_wrapping, conditional_escape, escape, escape
 from django.utils.html import json_script as _json_script
 from django.utils.html import linebreaks, strip_tags
 from django.utils.html import urlize as _urlize
+from django.utils.repr import DjangoRepr
 from django.utils.safestring import SafeData, mark_safe
 from django.utils.text import Truncator, normalize_newlines, phone2numeric
 from django.utils.text import slugify as _slugify
@@ -966,3 +968,22 @@ def pluralize(value, arg="s"):
 def phone2numeric_filter(value):
     """Take a phone number and converts it in to its numerical equivalent."""
     return phone2numeric(value)
+
+
+PRINT_LIMIT = 4096
+repr_instance = DjangoRepr()
+repr_instance.config(PRINT_LIMIT)
+
+
+@register.filter(is_safe=True)
+def pprint(v):
+    try:
+        if isinstance(v, Sized) and len(v) > PRINT_LIMIT:
+            diff = len(v) - PRINT_LIMIT
+            repr_instance.fillvalue = "...<trimmed %d bytes string>" % diff
+        v = repr_instance.repr(v)
+
+    except Exception as e:
+        v = "Error in formatting: %s: %s" % (e.__class__.__name__, e)
+
+    return v

django/views/debug.py

@@ -5,12 +5,12 @@ import re
 import sys
 import types
 import warnings
-from collections.abc import Sized
 from pathlib import Path
 
 from django.conf import settings
 from django.http import Http404, HttpResponse, HttpResponseNotFound
 from django.template import Context, Engine, TemplateDoesNotExist
+from django.template.defaultfilters import pprint
 from django.urls import resolve
 from django.utils import timezone
 from django.utils.datastructures import MultiValueDict
@@ -358,18 +358,7 @@ class ExceptionReporter:
             if "vars" in frame:
                 frame_vars = []
                 for k, v in frame["vars"]:
-
+                    v = pprint(v)
-                    try:
-                        if isinstance(v, Sized) and len(v) > self.PRINT_LIMIT:
-                            diff = len(v) - self.PRINT_LIMIT
-                            self.repr_instance.fillvalue = (
-                                "...<trimmed %d bytes string>" % diff
-                            )
-                        v = self.repr_instance.repr(v)
-
-                    except Exception as e:
-                        v = "Error in formatting: %s: %s" % (e.__class__.__name__, e)
-
                     frame_vars.append((k, v))
                 frame["vars"] = frame_vars
             frames[i] = frame