From 3c90f86450923a1451fc98e851dfd0c088d0c35b Mon Sep 17 00:00:00 2001
From: Nuno Freitas <nunofreitas@gmail.com>
Date: Mon, 19 Apr 2021 19:54:10 +0100
Subject: [PATCH 1/3] refactor: add isIgnored function

---
 src/isIgnored.js    | 5 +++++
 src/sitemapItems.js | 4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)
 create mode 100644 src/isIgnored.js

diff --git a/src/isIgnored.js b/src/isIgnored.js
new file mode 100644
index 0000000..be4cb7e
--- /dev/null
+++ b/src/isIgnored.js
@@ -0,0 +1,5 @@
+"use strict";
+
+const sitemapProperty = require("./sitemapProperty");
+
+module.exports = (item) => sitemapProperty(item, "ignore") || !item.url;
diff --git a/src/sitemapItems.js b/src/sitemapItems.js
index c0034b1..d850804 100644
--- a/src/sitemapItems.js
+++ b/src/sitemapItems.js
@@ -1,11 +1,11 @@
 "use strict";
 
+const isIgnored = require("./isIgnored");
 const paginationItems = require("./paginationItems");
 const sitemapItem = require("./sitemapItem");
-const sitemapProperty = require("./sitemapProperty");
 
 module.exports = (items, options) =>
   items
     .flatMap(paginationItems)
-    .filter((item) => !sitemapProperty(item, "ignore") && item.url)
+    .filter((item) => !isIgnored(item))
     .map((item) => sitemapItem(item, options));

From 201d4bdda293021ee7d8c30725f45efe6f4d0220 Mon Sep 17 00:00:00 2001
From: Nuno Freitas <nunofreitas@gmail.com>
Date: Mon, 19 Apr 2021 20:06:31 +0100
Subject: [PATCH 2/3] chore(git): eol for js files

---
 .gitattributes | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 .gitattributes

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..4964429
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+*.js eol=lf

From bdbce09bd7dc297cff7cd4e49aaa9a70e5cf3a6e Mon Sep 17 00:00:00 2001
From: Nuno Freitas <nunofreitas@gmail.com>
Date: Mon, 19 Apr 2021 20:12:38 +0100
Subject: [PATCH 3/3] fix: duplicated items

If there are multiple items with the same URL, only the first one will be included in the sitemap.

fix #20
---
 examples/pagination/posts.njk |  1 +
 src/isDuplicated.js           | 16 ++++++++++++++++
 src/sitemapItems.js           |  6 +++++-
 3 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 src/isDuplicated.js

diff --git a/examples/pagination/posts.njk b/examples/pagination/posts.njk
index 289dd71..7bc24f0 100644
--- a/examples/pagination/posts.njk
+++ b/examples/pagination/posts.njk
@@ -3,6 +3,7 @@ pagination:
   data: posts
   size: 1
   alias: post
+  addAllPagesToCollections: true
 permalink: "{{ post.url }}/"
 ---
 
diff --git a/src/isDuplicated.js b/src/isDuplicated.js
new file mode 100644
index 0000000..dfa07cf
--- /dev/null
+++ b/src/isDuplicated.js
@@ -0,0 +1,16 @@
+"use strict";
+
+module.exports = (item, index, collection) => {
+  if (!collection) {
+    return false;
+  }
+
+  const notFoundIndex = -1;
+  const firstIndex = collection.findIndex((other) => other.url === item.url);
+
+  if (firstIndex === notFoundIndex) {
+    return false;
+  }
+
+  return index !== firstIndex;
+};
diff --git a/src/sitemapItems.js b/src/sitemapItems.js
index d850804..16afced 100644
--- a/src/sitemapItems.js
+++ b/src/sitemapItems.js
@@ -1,11 +1,15 @@
 "use strict";
 
 const isIgnored = require("./isIgnored");
+const isDuplicated = require("./isDuplicated");
 const paginationItems = require("./paginationItems");
 const sitemapItem = require("./sitemapItem");
 
 module.exports = (items, options) =>
   items
     .flatMap(paginationItems)
-    .filter((item) => !isIgnored(item))
+    .filter(
+      (item, index, collection) =>
+        !isIgnored(item) && !isDuplicated(item, index, collection)
+    )
     .map((item) => sitemapItem(item, options));