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lib/verk_web/range_paginator.ex
defmodule VerkWeb.RangePaginator do
defstruct [:page, :per_page, :from, :to, :has_next, :has_prev]
def new(total_entries, page \\ 1, per_page \\ 20) do
page = to_int(page, 1)
per_page = to_int(per_page, 20)
from = if page > 1, do: (page - 1) * per_page, else: 0
to = if page > 1, do: (from + per_page) - 1, else: per_page - 1
has_next = total_entries - 1 > to
has_prev = page > 1
%VerkWeb.RangePaginator{
page: page,
per_page: per_page,
from: from,
to: to,
has_next: has_next,
has_prev: has_prev
}
end
defp to_int(nil, default), do: default
defp to_int(page, _) when is_integer(page), do: page
defp to_int(page, _), do: Integer.parse(page) |> elem(0)
end