From bd42fbff628ca5831d7a0f9b18e3466bd6dbe8a5 Mon Sep 17 00:00:00 2001
From: Volpeon <git@volpeon.ink>
Date: Sun, 21 Aug 2022 18:33:02 +0200
Subject: Don't use random pages for "related"

---
 scripts/page.lua | 41 ++++++++++++++++++++++-------------------
 1 file changed, 22 insertions(+), 19 deletions(-)

(limited to 'scripts/page.lua')

diff --git a/scripts/page.lua b/scripts/page.lua
index dcbb36f..7378bfc 100644
--- a/scripts/page.lua
+++ b/scripts/page.lua
@@ -130,32 +130,35 @@ function generate_list(meta)
     end
 end
 
+function deref_page(pages)
+    return function(ref)
+        return pages[utils.stringify(ref)]
+    end
+end
+
 function generate_related(meta)
     if not meta.parent then return nil end
 
-    meta = meta.parent
+    local deref = deref_page(meta.parent.pages.by_id)
 
-    local items = meta.pages.random:take(2):map(function (p) return d1_page_to_list_item(p) end)
+    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 #items == 0 then return nil end
+    if not meta.prev and not meta.next then return nil end
 
     return {
-        url = meta.url,
-        layout = meta.list_layout,
-        items = items
+        url = meta.parent.url,
+        layout = meta.parent.list_layout,
+        prev = meta.prev,
+        next = meta.next
     }
 end
 
-function deref_page(pages)
-    return function(ref)
-        return pages[utils.stringify(ref)]
-    end
-end
-
 function process_pages(meta)
-    meta.pages.all = meta.pages.all:filterMap(deref_page(meta.pages.by_id))
-    meta.pages.date_desc = meta.pages.date_desc:filterMap(deref_page(meta.pages.by_id))
-    meta.pages.random = meta.pages.all :clone():shuffle()
+    local deref = deref_page(meta.pages.by_id)
+
+    meta.pages.all = meta.pages.all:filterMap(deref)
+    meta.pages.date_desc = meta.pages.date_desc:filterMap(deref)
 end
 
 function resolve_urls(global, build, meta)
@@ -179,6 +182,7 @@ function resolve_urls(global, build, meta)
 end
 
 function process_base(meta)
+    meta.id = utils.stringify(meta.id)
     meta.depth = tonumber(utils.stringify(meta.depth))
     meta.file_out = utils.stringify(meta.file_out)
     meta.url = utils.stringify(meta.url)
@@ -187,6 +191,8 @@ function process_base(meta)
     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 utils.stringify(meta.thumbnail)
+    meta.prev = meta.prev and utils.stringify(meta.prev)
+    meta.next = meta.next and utils.stringify(meta.next)
 end
 
 function process(global, build, meta, dir)
@@ -207,7 +213,6 @@ function process(global, build, meta, dir)
 end
 
 function prune_pages(meta, up, down)
-    meta.pages.random = pandoc.List()
     meta.pages.by_id = {}
 
     if down == 0 then
@@ -231,8 +236,6 @@ function prune(meta, up, down)
 end
 
 function Meta(meta)
-    math.randomseed(os.time())
-
     local build = {}
 
     for key, value in pairs(meta) do
@@ -254,7 +257,7 @@ function Meta(meta)
 
     meta = meta.tree
 
-    local parts = utils.stringify(build.namespace):split('/'):skip(1)
+    local parts = build.namespace:split('/'):skip(1)
     for i = 1, #parts do
         local part = parts[i]
         local p = meta.pages.by_id[part]
-- 
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