From 78c0f712c12188992146ea9c93033a5e189cb548 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=93scar?= <welpo@users.noreply.github.com>
Date: Thu, 14 Sep 2023 00:38:24 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=94=8D=EF=B8=8F=20feat:=20enhance=20SEO?=
 =?UTF-8?q?=20and=20accessibility=20with=20meta=20tags=20(#154)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 templates/partials/header.html            | 21 ++++++++++---
 templates/partials/multilingual_tags.html | 37 +++++++++++++++++++++++
 2 files changed, 54 insertions(+), 4 deletions(-)
 create mode 100644 templates/partials/multilingual_tags.html

diff --git a/templates/partials/header.html b/templates/partials/header.html
index 26d1ffb..943e1fb 100644
--- a/templates/partials/header.html
+++ b/templates/partials/header.html
@@ -15,7 +15,7 @@
     {% endif %}
 
     {# Feed #}
-    <link rel="alternate" type="application/atom+xml" title="{{ config.title }}" href="{{ get_url(path="atom.xml",
+    <link rel="alternate" type="application/atom+xml" title="{{ config.title | safe }}" href="{{ get_url(path="atom.xml",
         trailing_slash=false) }}">
     
     {# CSS #}
@@ -79,19 +79,32 @@
         <meta name="robots" content="index, nofollow" />
     {% endif %}
 
-    <meta property="og:title" content="{{ config.title }}" />
+    <meta property="og:title" content="{{ page.title | default(value=config.title) | safe }}" />
     <meta property="og:type" content="article" />
 
+    {# Add og:locale and hreflang tags for multilingual sites #}
+    {%- if config.languages | length > 0 %}
+        {%- include "partials/multilingual_tags.html" -%}
+    {%- else -%}
+        <meta property="og:locale" content="{{ macros_translate::translate(key="date_locale", default="en_GB", language_strings=language_strings) }}" />
+    {%- endif %}
+
     {# Image for social media sharing #}
     {%- set social_media_card = macros_settings::evaluate_setting_priority(setting="social_media_card", page=page | default(value=""), section=section | default(value=""), default_global_value="") -%}
     {% if social_media_card %}
         <meta property="og:image" content="{{ get_url(path=social_media_card, cachebust=true) }}" />
+        {%- set meta = get_image_metadata(path=social_media_card, allow_missing=true) -%}
+        {%- if meta -%}
+            <meta property="og:image:width" content="{{ meta.width }}" />
+            <meta property="og:image:height" content="{{ meta.height }}" />
+        {%- endif -%}
         <meta name="twitter:image" content="{{ get_url(path=social_media_card, cachebust=true) }}" />
         <meta name="twitter:card" content="summary_large_image" />
     {% endif %}
 
-    {% set current_url = current_url | default(value="/") %}
-    <meta property="og:url" content="{{ current_url }}">
+    {%- if current_url -%}
+        <meta property="og:url" content="{{ current_url }}">
+    {%- endif -%}
     
     <meta property="og:site_name" content="{{ config.title }}">
 
diff --git a/templates/partials/multilingual_tags.html b/templates/partials/multilingual_tags.html
new file mode 100644
index 0000000..12357ef
--- /dev/null
+++ b/templates/partials/multilingual_tags.html
@@ -0,0 +1,37 @@
+{# Get the base filename by stripping out any language code and '.md' suffix #}
+{%- if page.relative_path -%}
+    {%- set base_filename = page.relative_path | replace(from=".md", to="") | replace(from="." ~ lang, to="") -%}
+
+    {# Loop through all available languages in config #}
+    {%- for lcode, ldetails in config.languages -%}
+        {%- set translated_filename = base_filename -%}
+
+        {# If the language is not the default language, append the language code to the base filename #}
+        {%- if lcode != config.default_language -%}
+            {%- set translated_filename = base_filename ~ "." ~ lcode -%}
+        {%- endif -%}
+
+        {%- set translated_filename = translated_filename ~ ".md" -%}
+        {%- set translated_page = get_page(path=translated_filename) -%}
+
+        {# Create the og:locale and hreflang tags if the translated page exists #}
+        {%- if translated_page -%}
+            
+            {#- Dynamically load the language strings for each language -#}
+            {%- set other_language_strings = load_data(path="i18n/" ~ lcode ~ ".toml", required=false) -%}
+            {%- if not other_language_strings -%}
+                {%- set other_language_strings = load_data(path="themes/tabi/i18n/" ~ lcode ~ ".toml", required=false) -%}
+            {%- endif -%}
+            <meta property="og:locale:alternate" content="{{ macros_translate::translate(key="date_locale", default="en_GB", language_strings=other_language_strings) }}" />
+
+            {# Construct href for hreflang #}
+            {%- set href = translated_page.permalink -%}
+            {%- if lcode == config.default_language -%}
+                {%- set href = href | replace(from='/' ~ lang ~ '/', to = '/') -%}
+            {%- else -%}
+                {%- set href = href | replace(from='/' ~ lang ~ '/', to='/' ~ lcode ~ '/') -%}
+            {%- endif -%}
+            <link rel="alternate" hreflang="{{ lcode }}" href="{{ href | safe }}" />
+        {%- endif -%}
+    {%- endfor -%}
+{%- endif -%}