defmodule Dragon.Plugin.Redirects do
@moduledoc """
Dragon Redirect plugin.
To use, include in headermatter:
```
redirect_from:
- /path-of-origin-link/
```
And this plugin will create html redirects to the "current" file where the
redirects_from are located.
"""
use Dragon.Context
import Dragon.Tools.File
import Dragon.Template.Functions, only: [eex: 1]
@behaviour Dragon.Plugin
@impl Dragon.Plugin
def run(%Dragon{} = _d, _origin, target, %{redirect_to: dest}, _content) do
{:ok, target, redirect_body(eex(dest))}
end
def run(%Dragon{} = _d, _origin, target, %{redirect_from: redirects} = h, content) do
with {:ok, build} <- Dragon.get(:build) do
target =
case h do
%{"@spec": %{output: "folder/index"}} -> Path.rootname(target)
_ -> Path.dirname(target)
end
redirect_body("#{Path.join("/", drop_root(build, target))}/")
|> create_redirects(build, redirects)
end
{:ok, target, content}
end
def run(_, _, target, _, content), do: {:ok, target, content}
defp create_redirects(content, build, [redirect | rest]) do
stderr([:light_black, "+ Redirect from ", :reset, :bright, redirect])
:ok = File.mkdir_p(Path.join(build, redirect))
write_file(Path.join([build, redirect, "index.html"]), content)
create_redirects(content, build, rest)
end
defp create_redirects(_, _, []), do: :ok
# redirects aren't bad anymore for SEO... is this still needed?
# probably not:
def redirect_body(canonical_url) do
"""
Redirecting…