Better navigation of related content

3 files changed, 35 insertions, 23 deletions

diff --git a/scripts/lib/common.lua b/scripts/lib/common.lua
index ee7c6aa..d3c6c44 100644
--- a/scripts/lib/common.lua
+++ b/scripts/lib/common.lua
@@ -1,15 +1,4 @@
-function dump(o)
-    if type(o) == 'table' then
-        local s = '{ '
-        for k, v in pairs(o) do
-            if type(k) ~= 'number' then k = '"' .. k .. '"' end
-            s = s .. '[' .. k .. '] = ' .. dump(v) .. ','
-        end
-        return s .. '} '
-    else
-        return tostring(o)
-    end
-end
+local utils = require 'pandoc.utils'
 
 function string.split(str, sep)
     sep = sep or '%s'
@@ -82,6 +71,25 @@ function pandoc.List:shuffle()
     return self
 end
 
+function dump(o)
+    if type(o) == 'table' then
+        local s = '{ '
+        for k, v in pairs(o) do
+            if type(k) ~= 'number' then k = '"' .. k .. '"' end
+            s = s .. '[' .. k .. '] = ' .. dump(v) .. ','
+        end
+        return s .. '} '
+    else
+        return tostring(o)
+    end
+end
+
+function prep_layout(layout)
+    layout = utils.stringify(layout)
+    return { id = layout, ["is_" .. layout] = true }
+end
+
 return {
-    dump = dump
+    dump = dump,
+    prep_layout = prep_layout
 }
diff --git a/scripts/metadata.lua b/scripts/metadata.lua
index 9c8a964..843ed3c 100644
--- a/scripts/metadata.lua
+++ b/scripts/metadata.lua
@@ -42,11 +42,6 @@ function resolve_layout(depth)
     return layout
 end
 
-function prep_layout(layout)
-    layout = utils.stringify(layout)
-    return { id = layout, ["is_" .. layout] = true }
-end
-
 function prep_namespace(namespace)
     namespace = utils.stringify(namespace)
 
@@ -138,11 +133,11 @@ function process_base(build, meta)
     meta.title = meta.title and utils.stringify(meta.title) or ""
     meta.slug = slug(meta.title)
     meta.schema_type = meta.schema_type or "CreativeWork"
-    meta.list_layout = prep_layout(meta.list_layout or "list")
+    meta.list_layout = common.prep_layout(meta.list_layout or "list")
     meta.list_order = meta.list_order and utils.stringify(meta.list_order)
     meta.position = meta.position and tonumber(utils.stringify(meta.position))
     meta.thumbnail = meta.thumbnail and make_absolute("thumbnail." .. utils.stringify(meta.thumbnail), meta.file_out)
-    meta.layout = prep_layout(meta.layout or (meta.redirect and "redirect") or resolve_layout(meta.depth))
+    meta.layout = common.prep_layout(meta.layout or (meta.redirect and "redirect") or resolve_layout(meta.depth))
 
     meta.show_date = meta.parent and meta.parent.list_order == "date_desc"
     meta.category = meta.parent and meta.parent.title
@@ -179,8 +174,8 @@ function find_pos(meta)
 
     if index == nil then return end
 
-    meta.prev = index >= 2 and pages[index - 1] or nil
-    meta.next = index <= #pages - 1 and pages[index + 1] or nil
+    meta.prev = index <= #pages - 1 and pages[index + 1] or nil
+    meta.next = index >= 2 and pages[index - 1] or nil
 end
 
 function Meta(meta)
diff --git a/scripts/page.lua b/scripts/page.lua
index 7378bfc..48eef6e 100644
--- a/scripts/page.lua
+++ b/scripts/page.lua
@@ -144,11 +144,20 @@ function generate_related(meta)
     meta.prev = meta.prev and d1_page_to_list_item(deref(meta.prev))
     meta.next = meta.next and d1_page_to_list_item(deref(meta.next))
 
+    if meta.prev then meta.prev.is_prev = true end
+    if meta.next then meta.next.is_next = true end
+
     if not meta.prev and not meta.next then return nil end
 
+    local layout = meta.parent.list_layout
+    local layout_id = utils.stringify(layout.id)
+    if layout_id ~= "grid-2" and layout_id ~= "gallery-2" then
+        layout = common.prep_layout("grid-2")
+    end
+
     return {
         url = meta.parent.url,
-        layout = meta.parent.list_layout,
+        layout = layout,
         prev = meta.prev,
         next = meta.next
     }