Removed sed from header build function since native substitution is s…

…afer (#4)

lib/functions/inline/build_header.sh

@@ -18,33 +18,21 @@ build_header() {
                 # If enabled (default:true), add a configurable content header after the metadata header. The purpose of this is to enable a standardised header for stuff like post dates that should be on *most* pages, but can be disabled on pages the user considers special and wants to build out completely on their own.
                 [[ $content_header == "true" ]] && cat $config/content_header.html >> $1
 
-                # Replace all tags with their value. Ampersands are a special character in sed, so we have to clean them up using bash string manipulation before running the sed global replace.
-                title=${title//&/\\&}
-                sed -i "s^{{title}}^$title^g" $1
+                # Replace all tags in {{this format}} with their value. We do this using Bash pattern replacement.
+                page_contents="$(cat $1)"
 
-                author=${author//&/\\&}
-                sed -i "s^{{author}}^$author^g" $1
-
-                description=${description//&/\\&}
-                sed -i "s^{{description}}^$description^g" $1
-
-                language=${language//&/\\&}
-                sed -i "s^{{language}}^$language^g" $1
-
-                thumbnail=${thumbnail//&/\\&}
-                sed -i "s^{{thumbnail}}^$thumbnail^g" $1
-
-                sed -i "s^{{published_date}}^$published_date^g" $1
-
-                sed -i "s^{{modified_date}}^$modified_date^g" $1
-
-                canonical_url=${canonical_url//&/\\&}
-                sed -i "s^{{canonical_url}}^$canonical_url^g" $1
-
-                base_url=${base_url//&/\\&}
-                sed -i "s^{{base_url}}^$base_url^g" $1
-
-                global_name=${global_name//&/\\&}
-                sed -i "s^{{global_name}}^$global_name^g" $1
+                page_contents="${page_contents//\{\{title\}\}/"$title"}"
+                page_contents="${page_contents//\{\{author\}\}/"$author"}"
+                page_contents="${page_contents//\{\{description\}\}/"$description"}"
+                page_contents="${page_contents//\{\{language\}\}/"$language"}"
+                page_contents="${page_contents//\{\{thumbnail\}\}/"$thumbnail"}"
+                page_contents="${page_contents//\{\{published_date\}\}/"$published_date"}"
+                page_contents="${page_contents//\{\{modified_date\}\}/"$modified_date"}"
+                page_contents="${page_contents//\{\{canonical_url\}\}/"$canonical_url"}"
+                page_contents="${page_contents//\{\{base_url\}\}/"$base_url"}"
+                page_contents="${page_contents//\{\{global_name\}\}/"$global_name"}"
+
+                echo "$page_contents" > $1
+                page_contents=""
         }
 }