From 9feae862ed5542d3b74684d818854e4fda7b3ca5 Mon Sep 17 00:00:00 2001
From: Pez Cuckow <email@pezcuckow.com>
Date: Fri, 8 Oct 2021 09:20:59 +0200
Subject: [PATCH] Explicitly rejoin filter list to a string

---
 biblatex_check.py |  2 +-
 tests/input.bib   | 13 +++++++++++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/biblatex_check.py b/biblatex_check.py
index cf23586..4b2b66f 100755
--- a/biblatex_check.py
+++ b/biblatex_check.py
@@ -389,7 +389,7 @@ def handleEntryField(lineNumber, line):
 
     # Checks per field type
     if fieldName == "author":
-        entryAuthor = filter(lambda x: not (x in '\\"{}'), fieldValue.split(" and ")[0])
+        entryAuthor = "".join(filter(lambda x: not (x in '\\"{}'), fieldValue.split(" and ")[0]))
         for author in fieldValue.split(" and "):
             comp = author.split(",")
             if len(comp) == 0:
diff --git a/tests/input.bib b/tests/input.bib
index 42eb346..aae9ecf 100644
--- a/tests/input.bib
+++ b/tests/input.bib
@@ -1,5 +1,5 @@
 % This file should fail with the commented errors
-% 14 errors expected
+% 15 errors expected
 
 % "misc": ["author/editor", "title", "year/date"]
 % year/date missing
@@ -95,4 +95,13 @@ @report{bibLatexChecker
   address={Address is an alias fro location},
   type = {Website},
   year = {2014},
-}
\ No newline at end of file
+}
+
+% "book": ["author", "title", "year/date"],
+% Capitals handled, and no errors in author field
+% year/date field missing
+@book {hartshorne1977algebraic,
+  AUTHOR = {Hartshorne R},
+  TITLE = {Algebraic geometry},
+  NOTE = {Graduate Texts in Mathematics, No. 52},
+}