102 lines
2.5 KiB
Elixir
102 lines
2.5 KiB
Elixir
defmodule Home73kWeb.BlogLive do
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@moduledoc """
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LiveView engine for Blog navigation
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"""
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use Home73kWeb, :live_view
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alias Home73k.Blog
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@page_size 7
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@impl true
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def mount(_params, _session, socket) do
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{:ok, socket}
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end
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@impl true
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def handle_params(params, _url, socket) do
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socket.assigns.live_action
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|> init_per_live_action(socket, params)
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|> live_noreply()
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end
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defp page_param_as_int(page) do
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try do
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String.to_integer(page)
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rescue
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_ -> nil
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end
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end
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defp raise_not_found(msg), do: raise Home73k.Blog.NotFoundError, msg
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defp init_per_live_action(:index, socket, _params) do
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socket
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|> assign(:page_title, "Blog")
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|> assign(:posts, get_posts_for_page!(1))
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|> assign(:page_count, get_page_count())
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|> assign_prev_next(1)
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end
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defp init_per_live_action(:page, socket, %{"page" => page}) do
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page_int = page_param_as_int(page)
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page_count = get_page_count()
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cond do
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is_nil(page_int) || page_int <= 1 ->
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push_patch(socket, to: Routes.blog_path(socket, :index))
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page_int > page_count ->
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raise_not_found("there are only #{page_count} pages of posts")
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true ->
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posts = get_posts_for_page!(page_int)
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socket
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|> assign(:page_title, "Blog \\ Page #{page}")
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|> assign(:posts, posts)
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|> assign(:page_count, page_count)
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|> assign_prev_next(page_int)
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end
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end
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defp init_per_live_action(:show, socket, %{"id" => id}) do
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post = Blog.get_post_by_id!(id)
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socket
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|> assign(:page_title, "Blog \\ #{post.title}")
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|> assign(:posts, [post])
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|> assign(:page_count, nil)
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|> assign_prev_next(0)
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end
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defp init_per_live_action(:tag, socket, %{"tag" => tag}) do
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socket
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|> assign(:page_title, "Blog \\ ##{tag}")
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|> assign(:posts, Blog.get_posts_by_tag!(tag))
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|> assign(:page_count, get_page_count())
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|> assign_prev_next(1)
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end
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defp get_posts_for_page!(1), do: Blog.list_posts() |> Enum.take(@page_size)
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defp get_posts_for_page!(page_int) do
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Blog.list_posts()
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|> Stream.chunk_every(@page_size)
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|> Enum.at(page_int - 1)
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end
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defp get_page_count, do: Kernel.ceil(Blog.post_count() / @page_size)
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defp assign_prev_next(socket, page_int) do
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socket
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|> assign(:page_prev, page_int < socket.assigns.page_count && page_int + 1 || nil)
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|> assign(:page_next, page_int > 1 && page_int - 1 || nil)
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end
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def format_date(date) do
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Calendar.strftime(date, "%B %-d, %Y")
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end
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end
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