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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 table_to_list(t, kv, cmp)
local l = pandoc.List()
if kv then
for key, value in pairs(t) do l:insert({key = key, value = value}) end
else
for _, value in pairs(t) do l:insert(value) end
end
l:sort(cmp or function(i1, i2) return i1.key < i2.key end)
return l
end
function group_by(l, field, insert)
insert = insert or function(group, _, item)
if not group then
group = l:new({item})
return group
end
group:insert(item)
end
local groups = {}
for i = 1, #l do
local item = l[i]
local f = field(item)
if f then
local out = insert(groups[f], f, item)
if out then groups[f] = out end
end
end
return groups
end
function splitstr(input, sep)
sep = sep or "%s"
local t = {}
for str in input:gmatch("([^" .. sep .. "]+)") do table.insert(t, str) end
return t
end
function relative_to(dir, target)
dir = splitstr(dir, "/")
target = splitstr(target, "/")
local prefix = true
local path = ""
for i = 1, math.min(#dir, #target) do
local t = target[i]
if prefix then
if dir[i] ~= t then
prefix = false
path = "../" .. t
end
else
path = "../" .. path .. "/" .. t
end
end
if #dir < #target then
for i = #dir + 1, #target do path = path .. (path == "" and "" or "/") .. target[i] end
elseif #dir > #target then
for _ = #target + 1, #dir do path = "../" .. path end
end
return path
end
function make_absolute(rel, base)
return rel:find("^/") and rel or base:gsub("^(.*)/.-$", "%1") .. "/" .. rel
end
function resolve_url(site_url, ref_file, target_file)
target_file = target_file:gsub("/index%.html$", "/")
local ref_base_dir = ref_file:gsub("^(.*)/.-$", "%1")
local abs = target_file
local rel = relative_to(ref_base_dir, abs):gsub("/index%.html$", "/")
return {abs = abs, rel = rel, full = (site_url .. abs)}
end
function resolve_layout(layout)
if layout then
layout = pandoc.utils.stringify(layout)
return {id = layout, ["is_" .. layout] = true}
end
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 resolve_category(categories, category)
if categories and category then
category = pandoc.utils.stringify(category)
data = categories[category]
data.id = category
return data
end
end
function prep_menu(active_id, main_menu)
local active_item = nil
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
end
return {
items = main_menu:filter(function(item) return not item.hidden or item.active end),
active = active_item,
}
end
function process_pages(global, pages_by_id)
if not pages_by_id then pages_by_id = {} end
local pages_list = pandoc.List()
for _, page in pairs(pages_by_id) do
page = process(global, page)
pages_list:insert(page)
end
pages_list:sort(function(p1, p2)
if p1.date then
if p2.date then
return p1.date.yyyy_mm_dd > p2.date.yyyy_mm_dd
else
return true
end
elseif p2.date then
return false
else
return p1.title < p2.title
end
end)
local pages_by_category = pages_list:filter(function(p) return p.category ~= nil end)
pages_by_category = group_by(pages_by_category, function(p) return p.category.id end,
function(data, _, p)
if not data then
local l = pandoc.List()
l:insert(p)
return {name = pandoc.utils.stringify(p.category.name), pages = l}
else
data.pages:insert(p)
end
end)
pages_by_category = table_to_list(pages_by_category, false,
function(i1, i2) return i1.name < i2.name end)
local pages_data = {all = pages_list, by_id = pages_by_id, by_category = pages_by_category}
return pages_data
end
function process(global, meta)
meta.namespace = resolve_namespace(meta.namespace)
meta.file_out = pandoc.utils.stringify(meta.file_out):gsub("^out", "")
meta.layout = resolve_layout(meta.layout)
meta.url = resolve_url(global.site.url, global.file_out, meta.file_out)
meta.title = (meta.title and pandoc.utils.stringify(meta.title)) or ""
if meta.preview then
meta.preview = make_absolute(pandoc.utils.stringify(meta.preview), meta.file_out)
meta.preview = resolve_url(global.site.url, global.file_out, meta.preview)
end
if meta.date then meta.date = format_date(meta.date) end
if meta.last_update then
meta.last_update = format_date(meta.last_update)
else
meta.last_update = meta.date
end
meta.category = resolve_category(global.categories[meta.namespace.root.id], meta.category)
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.pages)
return meta
end
function Meta(meta)
meta.site.url = pandoc.utils.stringify(meta.site.url):gsub("/$", "")
return process(meta, meta)
end
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