--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/piecrust/admin/textutil.py	Sat Jul 16 15:02:24 2016 +0200
@@ -0,0 +1,41 @@
+from html.parser import HTMLParser
+
+
+def text_preview(txt, length=100, *, max_length=None, offset=0):
+    max_length = max_length or (length + 50)
+    extract = txt[offset:offset + length]
+    if len(txt) > offset + length:
+        for i in range(offset + length,
+                       min(offset + max_length, len(txt))):
+            c = txt[i]
+            if c not in [' ', '\t', '\r', '\n']:
+                extract += c
+            else:
+                extract += '...'
+                break
+    return extract
+
+
+class MLStripper(HTMLParser):
+    def __init__(self):
+        super(MLStripper, self).__init__()
+        self.reset()
+        self.strict = False
+        self.convert_charrefs = True
+        self.fed = []
+
+    def handle_data(self, d):
+        self.fed.append(d)
+
+    def handle_entityref(self, name):
+        self.fed.append('&%s;' % name)
+
+    def get_data(self):
+        return ''.join(self.fed)
+
+
+def html_to_text(html):
+    s = MLStripper()
+    s.feed(html)
+    return s.get_data()
+