207 lines
5.1 KiB
Elixir
207 lines
5.1 KiB
Elixir
defmodule BDS.Menu do
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@moduledoc false
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require Record
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alias BDS.Persistence
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alias BDS.Projects
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Record.defrecord(:xmlElement, Record.extract(:xmlElement, from_lib: "xmerl/include/xmerl.hrl"))
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Record.defrecord(
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:xmlAttribute,
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Record.extract(:xmlAttribute, from_lib: "xmerl/include/xmerl.hrl")
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)
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@valid_kinds [:page, :submenu, :category_archive, :home]
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def get_menu(project_id) do
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project = Projects.get_project!(project_id)
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{:ok, load_menu(project)}
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end
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def update_menu(project_id, items) do
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project = Projects.get_project!(project_id)
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menu = %{items: normalize_menu_items(items)}
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:ok = write_menu_file(project, menu)
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{:ok, menu}
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end
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def sync_menu_from_filesystem(project_id) do
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project = Projects.get_project!(project_id)
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menu = load_menu(project)
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:ok = write_menu_file(project, menu)
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{:ok, menu}
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end
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defp load_menu(project) do
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case File.read(menu_path(project)) do
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{:ok, contents} ->
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%{items: parse_opml(contents) |> normalize_menu_items()}
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{:error, :enoent} ->
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%{items: normalize_menu_items([])}
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end
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end
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defp write_menu_file(project, menu) do
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path = menu_path(project)
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:ok = Persistence.atomic_write(path, serialize_opml(project, menu.items))
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end
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defp menu_path(project) do
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Path.join([Projects.project_data_dir(project), "meta", "menu.opml"])
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end
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defp normalize_menu_items(items) do
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without_home =
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items
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|> Enum.map(&normalize_menu_item/1)
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|> Enum.reject(&(&1.kind == :home))
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[%{kind: :home, label: "Home", slug: nil} | without_home]
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end
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defp normalize_menu_item(item) do
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kind = normalize_kind(attr(item, :kind))
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children = attr(item, :children)
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base = %{
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kind: kind,
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label: attr(item, :label) || "",
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slug: normalize_optional_string(attr(item, :slug))
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}
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if kind == :submenu do
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Map.put(base, :children, Enum.map(children || [], &normalize_menu_item/1))
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else
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base
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end
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end
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defp serialize_opml(project, items) do
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timestamp = project.updated_at || project.created_at || Persistence.now_ms()
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rendered_items =
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items
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|> Enum.map(&render_item(&1, 2))
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|> Enum.join("\n")
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[
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~s(<?xml version="1.0" encoding="UTF-8"?>),
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~s(<opml version="2.0">),
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~s( <head>),
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~s( <title>#{xml_escape(project.name)}</title>),
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~s( <dateCreated>#{Persistence.timestamp_to_iso8601(timestamp)}</dateCreated>),
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~s( <dateModified>#{Persistence.timestamp_to_iso8601(timestamp)}</dateModified>),
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~s( </head>),
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~s( <body>),
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rendered_items,
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~s( </body>),
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~s(</opml>),
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""
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]
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|> Enum.join("\n")
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end
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defp render_item(item, level) do
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indent = String.duplicate(" ", level)
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attrs = render_attributes(item)
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case Map.get(item, :children) do
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children when is_list(children) and children != [] ->
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child_markup =
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children
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|> Enum.map(&render_item(&1, level + 1))
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|> Enum.join("\n")
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[
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"#{indent}<outline#{attrs}>",
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child_markup,
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"#{indent}</outline>"
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]
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|> Enum.join("\n")
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_children ->
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"#{indent}<outline#{attrs} />"
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end
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end
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defp render_attributes(item) do
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[
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{"kind", item.kind},
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{"text", item.label},
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{"slug", item.slug}
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]
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|> Enum.reject(fn {_key, value} -> value in [nil, ""] end)
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|> Enum.map_join("", fn {key, value} -> ~s( #{key}="#{xml_escape(to_string(value))}") end)
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end
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defp parse_opml(contents) do
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{document, _rest} = :xmerl_scan.string(String.to_charlist(contents))
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:xmerl_xpath.string(~c"/opml/body/outline", document)
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|> Enum.map(&parse_outline/1)
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end
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defp parse_outline(element) do
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kind = element |> xml_attr(:kind) |> normalize_kind()
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base = %{
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kind: kind,
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label: xml_attr(element, :text) || "",
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slug: normalize_optional_string(xml_attr(element, :slug))
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}
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children =
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:xmerl_xpath.string(~c"./outline", element)
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|> Enum.map(&parse_outline/1)
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if kind == :submenu do
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Map.put(base, :children, children)
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else
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base
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end
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end
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defp xml_attr(element, name) do
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element
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|> xmlElement(:attributes)
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|> Enum.find_value(fn attribute ->
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if xmlAttribute(attribute, :name) == name do
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attribute |> xmlAttribute(:value) |> to_string()
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end
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end)
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end
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defp normalize_kind(kind) when is_atom(kind) and kind in @valid_kinds, do: kind
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defp normalize_kind(kind) when is_binary(kind) do
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kind
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|> String.to_existing_atom()
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|> normalize_kind()
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rescue
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_error -> :page
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end
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defp normalize_optional_string(nil), do: nil
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defp normalize_optional_string(""), do: nil
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defp normalize_optional_string(value), do: to_string(value)
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defp xml_escape(value) do
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value
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|> String.replace("&", "&")
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|> String.replace("<", "<")
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|> String.replace(">", ">")
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|> String.replace(~s("), """)
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end
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defp attr(attrs, key) do
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cond do
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Map.has_key?(attrs, key) -> Map.get(attrs, key)
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Map.has_key?(attrs, Atom.to_string(key)) -> Map.get(attrs, Atom.to_string(key))
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true -> nil
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end
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end
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end
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