1 files changed, 342 insertions, 0 deletions

diff --git a/scripts/metadata.lua b/scripts/metadata.lua
new file mode 100644
index 0000000..8f32bd4
--- /dev/null
+++ b/scripts/metadata.lua
@@ -0,0 +1,342 @@
+local path = require 'pandoc.path'
+
+function pandoc.List:flatten()
+    local result = pandoc.List()
+
+    for i = 1, #self do result:extend(self[i]) end
+
+    return result
+end
+
+function pandoc.List:flatMap(fn)
+    local mapped = self:map(fn)
+    local result = pandoc.List()
+
+    for i = 1, #mapped do result:extend(mapped[i]) end
+
+    return result
+end
+
+function pandoc.List:take(n)
+    if n >= #self then return self end
+
+    local result = pandoc.List()
+
+    for i = 1, n do result:insert(self[i]) end
+
+    return result
+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 page_sort(order)
+    return function(p1, p2)
+        if p1.position then
+            if p2.position then
+                return tonumber(p1.position) < tonumber(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
+
+function slug(str)
+    return str:lower():gsub("[^ a-z]", ""):gsub("[ ]+", "-")
+end
+
+function format_date(date)
+    if not date then return date end
+
+    date = pandoc.utils.normalize_date(pandoc.utils.stringify(date))
+    local year, month, day = date:match("(%d%d%d%d)-(%d%d)-(%d%d)")
+    if not year then return nil end
+
+    local time = os.time({ year = tonumber(year), month = tonumber(month), day = tonumber(day) })
+    return {
+        yyyy_mm_dd = os.date("%F", time),
+        yyyy = os.date("%Y", time),
+        mm = os.date("%m", time),
+        dd = os.date("%d", time),
+        rfc3339 = os.date("%FT%T+00:00", time),
+        long = os.date("%B %d, %Y", time),
+        short = os.date("%b %d, %Y", time),
+    }
+end
+
+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$", "/")
+
+    local ref_base_dir = path.directory(ref_file)
+    local abs = target_file
+    local rel = path.make_relative(abs, ref_base_dir, true)
+    local full = (abs:sub(1, 1) == "/" and (site_url .. abs)) or abs
+
+    return { abs = abs, rel = rel, full = full }
+end
+
+function resolve_layout(depth)
+    local layout = "categorized_list"
+
+    if depth == 0 then
+        layout = "page"
+    elseif depth == 1 then
+        layout = "list"
+    end
+
+    return layout
+end
+
+function prep_layout(layout)
+    layout = pandoc.utils.stringify(layout)
+    return { id = layout, ["is_" .. layout] = true }
+end
+
+function resolve_namespace(namespace)
+    namespace = pandoc.utils.stringify(namespace)
+
+    local root = "index"
+    if namespace ~= "" then root = namespace:gsub("^/([^/]*).*$", "%1") end
+
+    return { root = { id = root, ["is_" .. root] = true }, full = namespace }
+end
+
+function prep_menu(active_id, main_menu)
+    local active_item = nil
+    local items = pandoc.List()
+
+    for i = 1, #main_menu do
+        local item = main_menu[i]
+        local active = pandoc.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, order, pages_by_id)
+    if not pages_by_id then return nil end
+
+    local pages_all = pandoc.List()
+    local pages_date_desc = pandoc.List()
+
+    for _, page in pairs(pages_by_id) do
+        local p = process(global, page)
+        if not p.unlisted then
+            pages_all:insert(p)
+            if p.last_update then pages_date_desc:insert(p) end
+        end
+    end
+
+    pages_all:sort(page_sort(order))
+    pages_date_desc:sort(page_sort("date_desc"))
+
+    local pages_data = { all = pages_all, date_desc = pages_date_desc, by_id = pages_by_id }
+
+    return pages_data
+end
+
+function find_depth(pages)
+    local depth = 0
+
+    if pages then
+        for i = 1, #pages.all do
+            local p = pages.all[i]
+            local d = tonumber(p.depth)
+            if d > depth then depth = d end
+        end
+
+        depth = depth + 1
+    end
+
+    return depth
+end
+
+function d1_page_to_list_item(meta, p)
+    return {
+        title = p.title,
+        subtitle = p.subtitle,
+        date = p.date,
+        last_update = p.last_update,
+        schema_type = p.schema_type,
+        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,
+        schema_type = p.schema_type,
+        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 nil 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 and cat.pages.all) or pandoc.List())
+                    :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
+        return meta.pages.all
+            :map(function(cat)
+                local allItems = (cat.pages and cat.pages.all or pandoc.List()):flatMap(function(c)
+                    if not c.pages or not cat.list_flatten then
+                        return pandoc.List({ d1_page_to_list_item(cat, c) })
+                    else
+                        return c.pages.all:map(function(p) return d2_page_to_list_item(cat, c, p, true) end)
+                    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)
+    end
+end
+
+function process(global, meta)
+    meta.namespace = resolve_namespace(meta.namespace)
+    meta.file_out = pandoc.utils.stringify(meta.file_out):gsub("^out", "")
+    meta.redirect = meta.url and true
+    meta.url = meta.url and pandoc.utils.stringify(meta.url)
+    meta.url = resolve_url(global.site.url, global.file_out, meta.url or meta.file_out)
+    meta.title = (meta.title and pandoc.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"
+    if meta.list_order then meta.list_order = pandoc.utils.stringify(meta.list_order) end
+    meta.list_layout = meta.list_layout and prep_layout(meta.list_layout)
+    if meta.list_limit then meta.list_limit = tonumber(pandoc.utils.stringify(meta.list_limit)) end
+    if meta.position then meta.position = pandoc.utils.stringify(meta.position) end
+
+    if meta.feed then
+        if meta.file_out:match(".html$") then
+            meta.feed = {
+                url = resolve_url(global.site.url, global.file_out, meta.file_out:gsub(".html$", ".xml")),
+            }
+        else
+            meta.page = {
+                url = resolve_url(global.site.url, global.file_out, meta.file_out:gsub(".xml$", ".html")),
+            }
+        end
+    end
+
+    if meta.thumbnail then
+        meta.thumbnail = make_absolute("thumbnail." .. pandoc.utils.stringify(meta.thumbnail),
+            meta.file_out)
+        meta.thumbnail = resolve_url(global.site.url, global.file_out, meta.thumbnail)
+    end
+
+    if meta.menus and meta.menus.main then
+        meta.menus.main = prep_menu(meta.namespace.root.id, meta.menus.main)
+    end
+
+    meta.pages = process_pages(global, meta.list_order, meta.pages)
+    meta.depth = find_depth(meta.pages)
+    meta.layout = prep_layout(meta.layout or (meta.redirect and "redirect") or resolve_layout(meta.depth))
+
+    if meta.date then
+        meta.date = format_date(meta.date)
+    elseif meta.pages and #meta.pages.date_desc ~= 0 then
+        meta.date = meta.pages.date_desc[1].date
+    end
+
+    if meta.last_update then
+        meta.last_update = format_date(meta.last_update)
+    elseif meta.pages and #meta.pages.date_desc ~= 0 then
+        meta.last_update = meta.pages.date_desc[1].last_update
+    elseif meta.date then
+        meta.last_update = meta.date
+    end
+
+    meta.list = generate_list(meta)
+
+    return meta
+end
+
+function Meta(meta)
+    meta.site.url = pandoc.utils.stringify(meta.site.url):gsub("/$", "")
+
+    return process(meta, meta)
+end