From 9acab4200ad454a030edefd0f41e39b3e4936c84 Mon Sep 17 00:00:00 2001
From: Volpeon <git@volpeon.ink>
Date: Thu, 4 Aug 2022 21:27:32 +0200
Subject: Improved metadata processing

---
 scripts/lib/common.lua |  23 +++++++
 scripts/metadata.lua   |  39 ++++++++---
 scripts/page.lua       | 181 +++++++++++++++++++++++++------------------------
 3 files changed, 147 insertions(+), 96 deletions(-)

diff --git a/scripts/lib/common.lua b/scripts/lib/common.lua
index 5ed3e31..ee7c6aa 100644
--- a/scripts/lib/common.lua
+++ b/scripts/lib/common.lua
@@ -39,6 +39,20 @@ function pandoc.List:flatMap(fn)
     return result
 end
 
+function pandoc.List:filterMap(fn)
+    local mapped = self:map(fn)
+    local result = pandoc.List()
+
+    for i = 1, #mapped do
+        local val = mapped[i]
+        if val then
+            result:insert(val)
+        end
+    end
+
+    return result
+end
+
 function pandoc.List:take(n)
     if n >= #self then return self end
 
@@ -59,6 +73,15 @@ function pandoc.List:skip(n)
     return result
 end
 
+function pandoc.List:shuffle()
+    for i = #self, 2, -1 do
+        local j = math.random(i)
+        self[i], self[j] = self[j], self[i]
+    end
+
+    return self
+end
+
 return {
     dump = dump
 }
diff --git a/scripts/metadata.lua b/scripts/metadata.lua
index afd0ca5..5d372fc 100644
--- a/scripts/metadata.lua
+++ b/scripts/metadata.lua
@@ -71,13 +71,11 @@ function prep_menu(active_id, main_menu)
     return { items = items, active = active_item }
 end
 
-function process_pages(global, build, meta)
+function process_pages(meta)
     local pages_all = pandoc.List()
     local pages_date_desc = pandoc.List()
 
     for id, p in pairs(meta.pages) do
-        process(global, build, p, meta)
-
         if not p.unlisted then
             pages_all:insert(id)
             if p.last_update then pages_date_desc:insert(id) end
@@ -86,8 +84,14 @@ function process_pages(global, build, meta)
 
     pages_all:sort(sort.page_sort(meta.list_order, meta.pages))
     pages_date_desc:sort(sort.page_sort("date_desc", meta.pages))
+    local pages_random = pages_all:clone():shuffle()
 
-    meta.pages = { all = pages_all, date_desc = pages_date_desc, by_id = meta.pages }
+    meta.pages = {
+        all = pages_all,
+        date_desc = pages_date_desc,
+        random = pages_random,
+        by_id = meta.pages
+    }
 end
 
 function find_depth(meta)
@@ -126,7 +130,7 @@ function resolve_dates(meta)
     meta.was_updated = meta.date and meta.last_update and meta.date.yyyy_mm_dd ~= meta.last_update.yyyy_mm_dd
 end
 
-function process_base(build, meta, parent)
+function process_base(build, meta)
     meta.namespace = prep_namespace(meta.namespace)
     meta.file_out = utils.stringify(meta.file_out)
     meta.unlisted = meta.unlisted or (meta.draft and build.mode ~= "dev")
@@ -140,16 +144,33 @@ function process_base(build, meta, parent)
     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.show_date = parent and parent.list_order == "date_desc"
+
+    meta.description = (meta.description and pandoc.MetaBlocks(pandoc.Para(meta.description))) or
+        (not meta.no_description and meta.content)
+    meta.show_date = meta.parent and meta.parent.list_order == "date_desc"
+    meta.category = meta.parent and meta.parent.title
+    meta.icon = meta.icon or (meta.parent and meta.parent.icon)
+    meta.post_icon = meta.post_icon or (meta.parent and meta.parent.list_post_icon) or
+        (meta.parent and meta.parent.parent and meta.parent.parent.list_post_icon)
+    meta.indicator = meta.parent and meta.parent.list_read_indicators
 end
 
-function process(global, build, meta, parent)
-    process_base(build, meta, parent)
-    process_pages(global, build, meta)
+function process(global, build, meta)
+    process_base(build, meta)
+
+    for _, p in pairs(meta.pages) do
+        p.parent = meta
+        process(global, build, p)
+        p.parent = nil
+    end
+
+    process_pages(meta)
     resolve_dates(meta)
 end
 
 function Meta(meta)
+    math.randomseed(os.time())
+
     local build = {}
 
     for key, value in pairs(meta) do
diff --git a/scripts/page.lua b/scripts/page.lua
index 417e4a0..fd12230 100644
--- a/scripts/page.lua
+++ b/scripts/page.lua
@@ -35,93 +35,60 @@ function prep_menu(namespace, main_menu)
     return { items = items, active = active_item }
 end
 
-function process_pages(global, build, meta)
-    for _, p in pairs(meta.pages.by_id) do
-        process_pages(global, build, p)
-    end
-
-    meta.pages = {
-        all = meta.pages.all:map(function (ref) return meta.pages.by_id[utils.stringify(ref)] end),
-        date_desc = meta.pages.date_desc:map(function (ref) return meta.pages.by_id[utils.stringify(ref)] end),
-        by_id = meta.pages.by_id
-    }
-end
-
-function resolve_urls(global, build, meta)
-    meta.url = resolve_url(global.site.url, build.file_out, meta.url)
-
-    if meta.feed then
-        if meta.file_out:match(".html$") then
-            meta.feed = {
-                url = resolve_url(global.site.url, build.file_out, meta.file_out:gsub(".html$", ".xml")),
-            }
-        else
-            meta.page = {
-                url = resolve_url(global.site.url, build.file_out, meta.file_out:gsub(".xml$", ".html")),
-            }
-        end
-    end
-
-    if meta.thumbnail then
-        meta.thumbnail = resolve_url(global.site.url, build.file_out, meta.thumbnail)
-    end
-end
-
-function d1_page_to_list_item(meta, p)
+function d1_page_to_list_item(meta)
     return {
-        title = p.title,
-        subtitle = p.subtitle,
-        date = p.date,
-        last_update = p.last_update,
-        show_date = p.show_date,
-        schema_type = p.schema_type,
-        draft = p.draft,
-        position = p.position,
-        url = p.url,
-        rel = p.rel,
-        slug = p.slug,
-        thumbnail = p.thumbnail,
-        icon = p.icon or meta.icon,
-        post_icon = p.post_icon or meta.list_post_icon,
-        indicator = meta.list_read_indicators,
+        title = meta.title,
+        subtitle = meta.subtitle,
+        date = meta.date,
+        last_update = meta.last_update,
+        show_date = meta.show_date,
+        schema_type = meta.schema_type,
+        draft = meta.draft,
+        position = meta.position,
+        url = meta.url,
+        rel = meta.rel,
+        slug = meta.slug,
+        thumbnail = meta.thumbnail,
+        icon = meta.icon,
+        post_icon = meta.post_icon,
+        indicator = meta.indicator,
     }
 end
 
-function d2_page_to_list_item(meta, cat, p, set_cat_title)
+function d2_page_to_list_item(meta, with_category)
     return {
-        title = p.title,
-        subtitle = p.subtitle,
-        category = set_cat_title and cat.title,
-        date = p.date,
-        last_update = p.last_update,
-        show_date = p.show_date,
-        schema_type = p.schema_type,
-        draft = p.draft,
-        position = p.position,
-        url = p.url,
-        rel = p.rel,
-        slug = p.slug,
-        thumbnail = p.thumbnail,
-        icon = p.icon or cat.icon,
-        post_icon = p.post_icon or cat.list_post_icon or meta.list_post_icon,
-        indicator = cat.list_read_indicators,
+        title = meta.title,
+        subtitle = meta.subtitle,
+        category = with_category and meta.category,
+        date = meta.date,
+        last_update = meta.last_update,
+        show_date = meta.show_date,
+        schema_type = meta.schema_type,
+        draft = meta.draft,
+        position = meta.position,
+        url = meta.url,
+        rel = meta.rel,
+        slug = meta.slug,
+        thumbnail = meta.thumbnail,
+        icon = meta.icon,
+        post_icon = meta.post_icon,
+        indicator = meta.indicator,
     }
 end
 
-function cat_to_list_cat(cat, allItems)
-    local limit = cat.list_limit or 9999
+function cat_to_list_cat(meta, allItems)
+    local limit = meta.list_limit or 9999
     local items = allItems:take(limit)
     local omitted = #allItems - #items
 
     return {
-        title = cat.title,
-        description = (cat.description and pandoc.MetaBlocks(pandoc.Para(cat.description))) or
-            (not cat.no_description and cat.content),
-        last_update = cat.last_update,
-        schema_type = cat.schema_type,
-        url = cat.url,
-        slug = cat.slug,
-        layout = cat.list_layout,
+        title = meta.title,
+        description = meta.description,
+        last_update = meta.last_update,
+        schema_type = meta.schema_type,
+        url = meta.url,
+        slug = meta.slug,
+        layout = meta.list_layout,
         items = items,
         total = tostring(#allItems),
         omitted = omitted ~= 0 and tostring(omitted),
@@ -132,13 +99,13 @@ function generate_list(meta)
     if meta.depth < 1 then return pandoc.List() end
 
     if meta.depth == 1 then
-        return meta.pages.all:map(function(p) return d1_page_to_list_item(meta, p) end)
+        return meta.pages.all
     end
 
     if meta.depth == 2 then
         return meta.pages.all
             :map(function(cat)
-                local allItems = cat.pages.all:map(function(p) return d2_page_to_list_item(meta, cat, p, false) end)
+                local allItems = cat.pages.all:map(function(p) return d2_page_to_list_item(p, false) end)
 
                 return cat_to_list_cat(cat, allItems)
             end)
@@ -150,9 +117,9 @@ function generate_list(meta)
             :map(function(cat)
                 local allItems = cat.pages.all:flatMap(function(c)
                     if cat.list_flatten and c.depth ~= 0 then
-                        return c.pages.all:map(function(p) return d2_page_to_list_item(cat, c, p, true) end)
+                        return c.pages.all:map(function(p) return d2_page_to_list_item(p, true) end)
                     else
-                        return pandoc.List({ d1_page_to_list_item(cat, c) })
+                        return pandoc.List({ d1_page_to_list_item(c) })
                     end
                 end)
 
@@ -166,6 +133,38 @@ function generate_list(meta)
     end
 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.random:filterMap(deref_page(meta.pages.by_id))
+end
+
+function resolve_urls(global, build, meta)
+    meta.url = resolve_url(global.site.url, build.file_out, meta.url)
+
+    if meta.feed then
+        if meta.file_out:match(".html$") then
+            meta.feed = {
+                url = resolve_url(global.site.url, build.file_out, meta.file_out:gsub(".html$", ".xml")),
+            }
+        else
+            meta.page = {
+                url = resolve_url(global.site.url, build.file_out, meta.file_out:gsub(".xml$", ".html")),
+            }
+        end
+    end
+
+    if meta.thumbnail then
+        meta.thumbnail = resolve_url(global.site.url, build.file_out, meta.thumbnail)
+    end
+end
+
 function process_base(meta)
     meta.depth = tonumber(utils.stringify(meta.depth))
     meta.file_out = utils.stringify(meta.file_out)
@@ -177,13 +176,25 @@ function process_base(meta)
     meta.thumbnail = meta.thumbnail and utils.stringify(meta.thumbnail)
 end
 
-function process(global, build, meta)
+function process(global, build, meta, dir)
     process_base(meta)
     resolve_urls(global, build, meta)
 
-    for _, p in pairs(meta.pages.by_id) do
-        process(global, build, p)
+    if dir >= 0 then
+        for _, p in pairs(meta.pages.by_id) do
+            p.parent = meta
+            process(global, build, p, 1)
+            p.parent = nil
+        end
     end
+
+    process_pages(meta)
+
+    meta.list = generate_list(meta)
+
+    -- if dir <= 0 and meta.parent then
+    --     process(global, build, meta.parent, -1)
+    -- end
 end
 
 function Meta(meta)
@@ -206,8 +217,6 @@ function Meta(meta)
 
     meta = meta.tree
 
-    process(global, build, meta)
-
     local parts = utils.stringify(build.namespace):split('/'):skip(1)
     for i = 1, #parts do
         local part = parts[i]
@@ -217,9 +226,7 @@ function Meta(meta)
         meta = p
     end
 
-    process_pages(global, build, meta)
-
-    meta.list = generate_list(meta)
+    process(global, build, meta, 0)
 
     if global.menus and global.menus.main then
         global.menus.main = prep_menu(meta.namespace.full, global.menus.main)
-- 
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