Overhauled metadata handling

8 files changed, 337 insertions, 213 deletions

diff --git a/Makefile b/Makefile
index 52a90f9..aaf589d 100644
--- a/Makefile
+++ b/Makefile
@@ -50,7 +50,7 @@ subpages = $(patsubst content/%.md,.cache/meta/%.json, \
         $(shell test -d $(patsubst .cache/meta%,content%,$(1)) && find $(patsubst .cache/meta%,content%,$(1)) -maxdepth 1 -type f -name "*.md" ! -name "index.md") \
         $(shell test -d $(patsubst .cache/meta%,content%,$(1)) && find $(patsubst .cache/meta%,content%,$(1)) -mindepth 2 -maxdepth 2 -type f -name "index.md"))
 
-.cache/meta/%.json: content/%.md $$(call subpages,$$(call namespace,$$@,)) filters/*.lua scripts/pages_content.lua scripts/subpages.jq scripts/metadata.json | .cache/meta
+.cache/meta/%.json: content/%.md $$(call subpages,$$(call namespace,$$@,)) filters/*.lua scripts/content.lua scripts/subpages.jq scripts/metadata.json | .cache/meta
         $(info [META] $< -> $@)
         
         mkdir -p $(@D)
@@ -73,57 +73,70 @@ subpages = $(patsubst content/%.md,.cache/meta/%.json, \
                 -f markdown-citations-implicit_figures \
                 -t html5 \
                 --wrap preserve \
-                --lua-filter scripts/metadata.lua \
-                --lua-filter scripts/pages_content.lua \
+                --lua-filter scripts/content.lua \
                 $(GLOBAL_METADATA) \
                 --metadata-file "$@.meta" \
-                --metadata build.mode="$(MODE)" \
-                --metadata build.file_out="$(patsubst .cache/meta/%.json,/%.html,$@)" \
                 $(PANDOC_FILTERS) \
                 -o "$@.content" "$<"
         jq '. + { content: $$content }' --rawfile content "$@.content" "$@.meta" > "$@"
         rm "$@.meta"
         rm "$@.content"
 
+.cache/meta.json: .cache/meta/index.json scripts/metadata.lua | .cache
+        $(info [META] $@)
+        
+        mkdir -p $(@D)
+        pandoc \
+                -f markdown-citations-implicit_figures \
+                -t html5 \
+                --wrap preserve \
+                --no-highlight \
+                --lua-filter scripts/metadata.lua \
+                $(GLOBAL_METADATA) \
+                --metadata-file "$<" \
+                --metadata build.mode="$(MODE)" \
+                --template scripts/metadata.json \
+                -o "$@" "$<"
+
 .cache/assets.json: $(ASSET_FILES) | .cache
+        $(info [ASET] $@)
+
         sha256sum $^ | sed -r 's/([0-9a-f]+) +out\/(.*)/{ "\2": "\/\2?\1" }/' | jq '{ assets: [inputs] | add | with_entries( .key |= gsub( "\\."; "_") ) }' > "$@"
 
-out/%.html: content/%.md .cache/meta/%.json .cache/assets.json $(CONTENT_TEMPLATES_SRC) metadata/*.yaml filters/*.lua scripts/metadata.lua | out
+out/%.html: content/%.md .cache/meta.json .cache/assets.json $(CONTENT_TEMPLATES_SRC) metadata/*.yaml filters/*.lua scripts/page.lua | out
         $(info [MARK] $< -> $@)
         
         mkdir -p $(@D)
-        $(eval NAMESPACE = $(call namespace,$@,.cache/meta))
+        $(eval NAMESPACE = $(call namespace,$@,out))
         pandoc \
                 -f markdown-citations-implicit_figures \
                 -t html5 \
                 --wrap preserve \
                 --no-highlight \
                 --template templates/base.html \
-                --lua-filter scripts/metadata.lua \
+                --lua-filter scripts/page.lua \
                 $(GLOBAL_METADATA) \
                 --metadata-file .cache/assets.json \
-                --metadata-file "$(filter .cache/meta/%.json,$^)" \
-                --metadata build.mode="$(MODE)" \
+                --metadata-file .cache/meta.json \
                 --metadata build.namespace="$(NAMESPACE)" \
                 --metadata build.file_out="$(patsubst out/%,/%,$@)" \
                 $(PANDOC_FILTERS) \
                 -o "$@" "$<"
 
-out/%.xml: content/%.md .cache/meta/%.json $(FEED_TEMPLATES_SRC) metadata/*.yaml filters/*.lua scripts/metadata.lua | out
+out/%.xml: content/%.md .cache/meta.json $(FEED_TEMPLATES_SRC) metadata/*.yaml filters/*.lua scripts/page.lua | out
         $(info [FEED] $< -> $@)
         
         mkdir -p $(@D)
-        $(eval NAMESPACE = $(call namespace,$@,.cache/meta))
+        $(eval NAMESPACE = $(call namespace,$@,out))
         pandoc \
                 -f markdown-citations-implicit_figures \
                 -t html5 \
                 --wrap preserve \
                 --no-highlight \
                 --template templates/feed.xml \
-                --lua-filter scripts/metadata.lua \
+                --lua-filter scripts/page.lua \
                 $(GLOBAL_METADATA) \
-                --metadata-file "$(filter .cache/meta/%.json,$^)" \
-                --metadata build.mode="$(MODE)" \
+                --metadata-file .cache/meta.json \
                 --metadata build.namespace="$(NAMESPACE)" \
                 --metadata build.file_out="$(patsubst out/%,/%,$@)" \
                 $(PANDOC_FILTERS) \
diff --git a/filters/emojis.lua b/filters/emojis.lua
index 427d04b..24a9fc3 100644
--- a/filters/emojis.lua
+++ b/filters/emojis.lua
@@ -1,4 +1,14 @@
-function Str(el)
+local common = require 'scripts.lib.common'
+
+local vars = {}
+
+function meta(meta) vars = meta end
+
+function str(el)
+    if vars.build and vars.build.file_out:match(".xml$") then
+        return el
+    end
+
     local prefix, emojiref, suffix = el.text:match('^(.*):([^ ]+):(.*)$')
 
     if emojiref then
@@ -13,3 +23,5 @@ function Str(el)
 
     return el
 end
+
+return { { Meta = meta }, { Str = str } }
diff --git a/filters/vars.lua b/filters/vars.lua
index 99cedc4..61803cb 100644
--- a/filters/vars.lua
+++ b/filters/vars.lua
@@ -1,3 +1,4 @@
+local utils = require 'pandoc.utils'
 local common = require 'scripts.lib.common'
 
 local vars = {}
@@ -12,15 +13,14 @@ function str(el)
         local var = vars
 
         for i = 1, #parts do
-            local part = parts[i]
-            local v = var[part]
+            var = var[parts[i]]
 
-            if not v then return el end
-
-            var = v
+            if not var then
+                return el
+            end
         end
 
-        if var then return pandoc.Str(prefix .. var .. suffix) end
+        return pandoc.Str(prefix .. utils.stringify(var) .. suffix)
     end
 
     return el
diff --git a/scripts/pages_content.lua b/scripts/content.lua
index b753b1e..d77759d 100644
--- a/scripts/pages_content.lua
+++ b/scripts/content.lua
@@ -4,7 +4,7 @@ local namespace = ''
 local siteUrl = ''
 
 function meta(meta)
-    namespace = pandoc.utils.stringify(meta.namespace.full)
+    namespace = pandoc.utils.stringify(meta.namespace)
     siteUrl = pandoc.utils.stringify(meta.site.url):gsub("/$", "")
 end
 
diff --git a/scripts/lib/common.lua b/scripts/lib/common.lua
index 80b81ba..5ed3e31 100644
--- a/scripts/lib/common.lua
+++ b/scripts/lib/common.lua
@@ -49,6 +49,16 @@ function pandoc.List:take(n)
     return result
 end
 
+function pandoc.List:skip(n)
+    local result = pandoc.List()
+
+    if n >= #self then return result end
+
+    for i = n + 1, #self do result:insert(self[i]) end
+
+    return result
+end
+
 return {
     dump = dump
 }
diff --git a/scripts/lib/sort.lua b/scripts/lib/sort.lua
new file mode 100644
index 0000000..393e5d5
--- /dev/null
+++ b/scripts/lib/sort.lua
@@ -0,0 +1,36 @@
+local utils = require 'pandoc.utils'
+
+function page_sort(order, pages)
+    order = order and utils.stringify(order)
+
+    return function(ref1, ref2)
+        local p1 = pages and pages[utils.stringify(ref1)] or ref1
+        local p2 = pages and pages[utils.stringify(ref2)] or ref2
+
+        if p1.position then
+            if p2.position then
+                return tonumber(utils.stringify(p1.position)) < tonumber(utils.stringify(p2.position))
+            else
+                return true
+            end
+        elseif p2.position then
+            return false
+        elseif order == "date_desc" then
+            if p1.last_update then
+                if p2.last_update then
+                    return utils.stringify(p1.last_update.yyyy_mm_dd) > utils.stringify(p2.last_update.yyyy_mm_dd)
+                else
+                    return true
+                end
+            else
+                return false
+            end
+        else
+            return utils.stringify(p1.title):upper() < utils.stringify(p2.title):upper()
+        end
+    end
+end
+
+return {
+    page_sort = page_sort
+}
diff --git a/scripts/metadata.lua b/scripts/metadata.lua
index 6aa679a..5157677 100644
--- a/scripts/metadata.lua
+++ b/scripts/metadata.lua
@@ -1,31 +1,7 @@
 local path = require 'pandoc.path'
+local utils = require 'pandoc.utils'
 local common = require 'scripts.lib.common'
-
-function page_sort(order)
-    return function(p1, p2)
-        if p1.position then
-            if p2.position then
-                return p1.position < p2.position
-            else
-                return true
-            end
-        elseif p2.position then
-            return false
-        elseif order == "date_desc" then
-            if p1.last_update then
-                if p2.last_update then
-                    return p1.last_update.yyyy_mm_dd > p2.last_update.yyyy_mm_dd
-                else
-                    return true
-                end
-            else
-                return false
-            end
-        else
-            return p1.title:upper() < p2.title:upper()
-        end
-    end
-end
+local sort = require 'scripts.lib.sort'
 
 function slug(str)
     return str:lower():gsub("[^ a-z]", ""):gsub("[ ]+", "-")
@@ -34,7 +10,7 @@ end
 function format_date(date)
     if not date then return date end
 
-    date = pandoc.utils.normalize_date(pandoc.utils.stringify(date))
+    date = pandoc.utils.normalize_date(utils.stringify(date))
     local year, month, day = date:match("(%d%d%d%d)-(%d%d)-(%d%d)")
     if not year then return nil end
 
@@ -54,17 +30,6 @@ function make_absolute(rel, base)
     return path.is_absolute(rel) and rel or path.join({ path.directory(base), rel })
 end
 
-function resolve_url(site_url, ref_file, target_file)
-    target_file = target_file:gsub("/index%.html$", "/")
-
-    local ref_base_dir = path.directory(ref_file)
-    local abs = target_file
-    local rel = path.make_relative(abs, ref_base_dir, true)
-    local full = (abs:sub(1, 1) == "/" and (site_url .. abs)) or abs
-
-    return { abs = abs, rel = rel, full = full }
-end
-
 function resolve_layout(depth)
     local layout = "categorized_list"
 
@@ -78,12 +43,12 @@ function resolve_layout(depth)
 end
 
 function prep_layout(layout)
-    layout = pandoc.utils.stringify(layout)
+    layout = utils.stringify(layout)
     return { id = layout, ["is_" .. layout] = true }
 end
 
-function resolve_namespace(namespace)
-    namespace = pandoc.utils.stringify(namespace)
+function prep_namespace(namespace)
+    namespace = utils.stringify(namespace)
 
     local root = "index"
     if namespace ~= "" then root = namespace:gsub("^/([^/]*).*$", "%1") end
@@ -97,7 +62,7 @@ function prep_menu(active_id, main_menu)
 
     for i = 1, #main_menu do
         local item = main_menu[i]
-        local active = pandoc.utils.stringify(item.id) == active_id
+        local active = utils.stringify(item.id) == active_id
         item.active = active
         if active then active_item = item end
         if not item.hidden or item.active then items:insert(item) end
@@ -107,22 +72,20 @@ function prep_menu(active_id, main_menu)
 end
 
 function process_pages(global, build, meta)
-    local order = meta.list_order
-
     local pages_all = pandoc.List()
     local pages_date_desc = pandoc.List()
 
-    for _, p in pairs(meta.pages) do
+    for id, p in pairs(meta.pages) do
         process(global, build, p)
 
         if not p.unlisted then
-            pages_all:insert(p)
-            if p.last_update then pages_date_desc:insert(p) end
+            pages_all:insert(id)
+            if p.last_update then pages_date_desc:insert(id) end
         end
     end
 
-    pages_all:sort(page_sort(order))
-    pages_date_desc:sort(page_sort("date_desc"))
+    pages_all:sort(sort.page_sort(meta.list_order, meta.pages))
+    pages_date_desc:sort(sort.page_sort("date_desc", meta.pages))
 
     meta.pages = { all = pages_all, date_desc = pages_date_desc, by_id = meta.pages }
 end
@@ -145,35 +108,11 @@ function find_depth(meta)
     meta.depth = depth
 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
-
-    -- for _, p in pairs(meta.pages.by_id) do
-    --     resolve_urls(global, build, p)
-    -- end
-end
-
 function resolve_dates(meta)
     if meta.last_update then
         meta.last_update = format_date(meta.last_update)
     elseif #meta.pages.date_desc ~= 0 then
-        meta.last_update = meta.pages.date_desc[1].last_update
+        meta.last_update = meta.pages.by_id[meta.pages.date_desc[1]].last_update
     elseif meta.date then
         meta.last_update = format_date(meta.date)
     end
@@ -187,125 +126,23 @@ 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 d1_page_to_list_item(meta, p)
-    return {
-        title = p.title,
-        subtitle = p.subtitle,
-        date = p.date,
-        last_update = p.last_update,
-        show_date = meta.list_order == "date_desc",
-        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,
-    }
-end
-
-function d2_page_to_list_item(meta, cat, p, set_cat_title)
-    return {
-        title = p.title,
-        subtitle = p.subtitle,
-        category = set_cat_title and cat.title,
-        date = p.date,
-        last_update = p.last_update,
-        show_date = cat.list_order == "date_desc",
-        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,
-    }
-end
-
-function cat_to_list_cat(cat, allItems)
-    local limit = cat.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,
-        items = items,
-        total = tostring(#allItems),
-        omitted = omitted ~= 0 and tostring(omitted),
-    }
-end
-
-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)
-    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)
-
-                return cat_to_list_cat(cat, allItems)
-            end)
-            :filter(function(cat) return #cat.items ~= 0 end)
-    end
-
-    if meta.depth == 3 then
-        local list = meta.pages.all
-            :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)
-                    else
-                        return pandoc.List({ d1_page_to_list_item(cat, c) })
-                    end
-                end)
-
-                allItems:sort(page_sort(cat.list_order))
-
-                return cat_to_list_cat(cat, allItems)
-            end)
-            :filter(function(cat) return #cat.items ~= 0 end)
-
-        return list
-    end
-end
-
 function process_base(build, meta)
-    meta.namespace = resolve_namespace(meta.namespace)
-    meta.file_out = pandoc.utils.stringify(meta.file_out)
+    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")
     meta.redirect = meta.url and true
-    meta.url = meta.url and pandoc.utils.stringify(meta.url) or meta.file_out
-    meta.title = meta.title and pandoc.utils.stringify(meta.title) or ""
+    meta.url = meta.url or meta.file_out
+    meta.title = meta.title and utils.stringify(meta.title) or ""
     meta.slug = slug(meta.title)
-    meta.schema_type = meta.schema_type and pandoc.utils.stringify(meta.schema_type) or "CreativeWork"
-    meta.list_order = meta.list_order and pandoc.utils.stringify(meta.list_order)
+    meta.schema_type = meta.schema_type or "CreativeWork"
     meta.list_layout = prep_layout(meta.list_layout or "list")
-    meta.list_limit = meta.list_limit and tonumber(pandoc.utils.stringify(meta.list_limit))
-    meta.position = meta.position and tonumber(pandoc.utils.stringify(meta.position))
-    meta.thumbnail = meta.thumbnail and make_absolute("thumbnail." .. pandoc.utils.stringify(meta.thumbnail), meta.file_out)
+    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))
 end
 
 function process(global, build, meta)
     process_base(build, meta)
-    resolve_urls(global, build, meta)
     process_pages(global, build, meta)
     resolve_dates(meta)
 end
@@ -322,16 +159,10 @@ function Meta(meta)
         end
     end
 
-    meta.site.url = pandoc.utils.stringify(meta.site.url):gsub("/$", "")
+    meta.site.url = utils.stringify(meta.site.url):gsub("/$", "")
 
     find_depth(meta)
     process(meta, build, meta)
 
-    meta.list = generate_list(meta)
-
-    if meta.menus and meta.menus.main then
-        meta.menus.main = prep_menu(meta.namespace.root.id, meta.menus.main)
-    end
-
     return meta
 end
diff --git a/scripts/page.lua b/scripts/page.lua
new file mode 100644
index 0000000..e846dd5
--- /dev/null
+++ b/scripts/page.lua
@@ -0,0 +1,222 @@
+local path = require 'pandoc.path'
+local utils = require 'pandoc.utils'
+local common = require 'scripts.lib.common'
+local sort = require 'scripts.lib.sort'
+
+function resolve_url(site_url, ref_file, target_file)
+    site_url = utils.stringify(site_url)
+    ref_file = utils.stringify(ref_file)
+    target_file = utils.stringify(target_file):gsub("/index%.html$", "/")
+
+    local ref_base_dir = path.directory(ref_file)
+    local abs = target_file
+    local rel = path.make_relative(abs, ref_base_dir, true)
+    local full = (abs:sub(1, 1) == "/" and (site_url .. abs)) or abs
+
+    return { abs = abs, rel = rel, full = full }
+end
+
+function prep_menu(active_id, main_menu)
+    active_id = utils.stringify(active_id)
+
+    local active_item = nil
+    local items = pandoc.List()
+
+    for i = 1, #main_menu do
+        local item = main_menu[i]
+        local active = utils.stringify(item.id) == active_id
+        item.active = active
+        if active then active_item = item end
+        if not item.hidden or item.active then items:insert(item) end
+    end
+
+    return { items = items, active = active_item }
+end
+
+function process_pages(global, build, meta)
+    for _, p in pairs(meta.pages.by_id) do
+        process(global, build, p)
+    end
+
+    meta.pages = {
+        all = meta.pages.all:map(utils.stringify):map(function (ref) return meta.pages.by_id[ref] end),
+        date_desc = meta.pages.date_desc:map(utils.stringify):map(function (ref) return meta.pages.by_id[ref] end),
+        by_id = meta.pages.by_id
+    }
+end
+
+function resolve_urls(global, build, meta)
+    meta.url = resolve_url(global.site.url, build.file_out, meta.url)
+
+    if meta.feed then
+        if meta.file_out:match(".html$") 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)
+    return {
+        title = p.title,
+        subtitle = p.subtitle,
+        date = p.date,
+        last_update = p.last_update,
+        show_date = meta.list_order == "date_desc",
+        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,
+    }
+end
+
+function d2_page_to_list_item(meta, cat, p, set_cat_title)
+    return {
+        title = p.title,
+        subtitle = p.subtitle,
+        category = set_cat_title and cat.title,
+        date = p.date,
+        last_update = p.last_update,
+        show_date = cat.list_order == "date_desc",
+        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,
+    }
+end
+
+function cat_to_list_cat(cat, allItems)
+    local limit = cat.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,
+        items = items,
+        total = tostring(#allItems),
+        omitted = omitted ~= 0 and tostring(omitted),
+    }
+end
+
+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)
+    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)
+
+                return cat_to_list_cat(cat, allItems)
+            end)
+            :filter(function(cat) return #cat.items ~= 0 end)
+    end
+
+    if meta.depth == 3 then
+        local list = meta.pages.all
+            :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)
+                    else
+                        return pandoc.List({ d1_page_to_list_item(cat, c) })
+                    end
+                end)
+
+                allItems:sort(sort.page_sort(cat.list_order))
+
+                return cat_to_list_cat(cat, allItems)
+            end)
+            :filter(function(cat) return #cat.items ~= 0 end)
+
+        return list
+    end
+end
+
+function process_base(meta)
+    meta.depth = tonumber(utils.stringify(meta.depth))
+    meta.file_out = utils.stringify(meta.file_out)
+    meta.url = utils.stringify(meta.url)
+    meta.title = utils.stringify(meta.title)
+    meta.list_limit = meta.list_limit and tonumber(utils.stringify(meta.list_limit))
+    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)
+end
+
+function process(global, build, meta)
+    process_base(meta)
+    resolve_urls(global, build, meta)
+    process_pages(global, build, meta)
+end
+
+function Meta(meta)
+    local build = {}
+
+    for key, value in pairs(meta) do
+        local suffix = key:match('^build.(.*)$')
+
+        if suffix then
+            build[suffix] = value
+            meta[key] = nil
+        end
+    end
+
+    local global = {
+        assets = meta.assets,
+        site = meta.site,
+        menus = meta.menus
+    }
+
+    process(global, build, meta)
+
+    local parts = utils.stringify(build.namespace):split('/'):skip(1)
+    for i = 1, #parts do
+        meta = meta.pages.by_id[parts[i]]
+    end
+
+    meta.list = generate_list(meta)
+
+    if global.menus and global.menus.main then
+        global.menus.main = prep_menu(meta.namespace.root.id, global.menus.main)
+    end
+
+    for key, value in pairs(global) do
+        meta[key] = value
+    end
+
+    meta.build = build
+
+    return meta
+end