Hello lru_cache.

paste/forms.py

@@ -1,6 +1,8 @@
-from webtools import settings
 from django import forms
-from django.forms import ModelForm, CharField
+from django.forms import CharField, ModelForm
+
+from webtools import settings
+
 from .models import Paste
 
 

paste/models.py

@@ -1,10 +1,12 @@
-from django.db import models
-from django.core.validators import MaxLengthValidator
-from django.utils import timezone
 from datetime import datetime, timedelta
-from webtools import settings
-from django.utils.translation import gettext_lazy as _
+
 import shortuuid
+from django.core.validators import MaxLengthValidator
+from django.db import models
+from django.utils import timezone
+from django.utils.translation import gettext_lazy as _
+
+from webtools import settings
 
 
 class Paste(models.Model):

paste/urls.py

@@ -1,9 +1,9 @@
 from django.urls import path
 from django.views.static import serve
+
 from paste import views
 from webtools import settings
 
-
 urlpatterns = [
     path("", views.index, name="index"),
     path("static/<path>", serve, {"document_root": settings.STATIC_ROOT}),

paste/views.py

@@ -1,19 +1,18 @@
 import json
-from pathlib import Path
+from functools import lru_cache
 
+import pygments
 from django.http import HttpResponse, HttpResponseRedirect
 from django.shortcuts import get_object_or_404, render
 from django.template import RequestContext, loader
 from django.urls import reverse
 from django.views.decorators.csrf import csrf_exempt
-import pygments
 from pygments.formatters import HtmlFormatter
 from pygments.lexers import get_lexer_by_name
 
-from webtools import settings
-
 from paste.forms import PasteForm
 from paste.models import Paste
+from webtools import settings
 
 
 @csrf_exempt
@@ -51,26 +50,19 @@ def show(request, slug):
     paste.incr_viewcount()
 
     if "html" in request.headers["accept"]:
-        render_method = render_pygments
+        return HttpResponse(pygmentize(paste.filename, paste.content))
     else:
-        render_method = render_raw
-    return render_method(request, paste, {"slug": slug})
+        return HttpResponse(paste.content, content_type="text/plain")
 
 
-def render_pygments(request, paste, data):
-    """Renders Pygments template."""
+@lru_cache(1024)
+def pygmentize(filename, filecontents):
     try:
-        lexer = get_lexer_by_name(Path(paste.filename).suffix.strip("."))
+        lexer = get_lexer_by_name(filename.split(".")[-1])
     except pygments.util.ClassNotFound:
         lexer = get_lexer_by_name(settings.PASTE["default_language"])
     formatter = HtmlFormatter(style="emacs")
-    data["paste"] = paste
-    data["filename"] = paste.filename
-    data["highlighted"] = pygments.highlight(paste.content, lexer, formatter)
-    rendered = loader.render_to_string("paste/show-pygments.html", data, request)
-    return HttpResponse(rendered)
-
-
-def render_raw(request, paste, data):
-    """Renders RAW content."""
-    return HttpResponse(paste.content, content_type="text/plain")
+    data = {}
+    data["filename"] = filename
+    data["highlighted"] = pygments.highlight(filecontents, lexer, formatter)
+    return loader.render_to_string("paste/show-pygments.html", data)