Don't use random pages for "related"

1 files changed, 20 insertions, 0 deletions

diff --git a/scripts/metadata.lua b/scripts/metadata.lua
index 49a9c55..9c8a964 100644
--- a/scripts/metadata.lua
+++ b/scripts/metadata.lua
@@ -130,6 +130,7 @@ end
 
 function process_base(build, meta)
     meta.namespace = prep_namespace(meta.namespace)
+    meta.id = meta.namespace.full:gsub("^.*/(.-)$", "%1")
     meta.file_out = utils.stringify(meta.file_out)
     meta.unlisted = meta.unlisted or (meta.draft and build.mode ~= "dev")
     meta.redirect = meta.url and true
@@ -164,6 +165,24 @@ function process(global, build, meta)
     resolve_dates(meta)
 end
 
+function find_pos(meta)
+    for _, p in pairs(meta.pages.by_id) do
+        p.parent = meta
+        find_pos(p)
+        p.parent = nil
+    end
+
+    if not meta.parent then return end
+
+    local pages = meta.parent.list_order == "date_desc" and meta.parent.pages.date_desc or meta.parent.pages.all
+    local _, index = pages:find(meta.id)
+
+    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
+end
+
 function Meta(meta)
     local build = {}
 
@@ -180,6 +199,7 @@ function Meta(meta)
 
     find_depth(meta)
     process(meta, build, meta)
+    find_pos(meta)
 
     return meta
 end