## Elixir project file structure
> project
> deps
> lib
- project.ex
> test
- project_test.exs
- test_helper.exs
- mix.exs
- mix.lock
- README.md
# after running 'iex -S mix', run this to start server
{:ok, _} = Plug.Cowboy.http(Helloplug, [])
## mix.exs
defmodule Helloplug.MixProject do
use Mix.Project
def project do
[
app: :helloplug,
version: "0.1.0",
elixir: "~> 1.16",
start_permanent: Mix.env() == :prod,
deps: deps()
]
end
# Run "mix help compile.app" to learn about applications.
def application do
[applications: [
:logger,
# :sqlite_ecto,
# :ecto,
# :cowboy,
:plug,
:plug_cowboy
]
]
end
# Run "mix help deps" to learn about dependencies.
defp deps do
[
# {:cowboy, "~> 1.0.0"},
{:plug, "~> 1.0"},
{:plug_cowboy, "~> 1.0"}
# {:sqlite_ecto, ">= 1.0"},
# {:ecto_sqlite3, "~> 0.10"},
# {:ecto, "~> 1.0"}]
]
end
end
## test/project.exs
defmodule HelloplugTest do
use ExUnit.Case
doctest Helloplug
test "greets the world" do
assert Helloplug.hello() == :world
end
end
## main.exs
IO.puts("hello there!!!")
IO.puts(Helloplug.hello())
# for i <- [1,2,3] do
# IO.puts("hello #{i}")
# end
foo = 123
bar = 456
IO.puts(foo + bar)
## lib/project.ex
defmodule Helloplug do
@moduledoc """
Documentation for `Helloplug`.
"""
@doc """
Hello world.
## Examples
iex> Helloplug.hello()
:world
"""
def hello do
:world
end
def init(default_ops) do
IO.puts("starting up Helloplug...")
end
def call(conn, _opts) do
IO.puts("saying hello!")
route(conn.method, conn.path_info, conn)
end
def template_show_user(user_id) do
EEx.eval_string("""<![CDATA[
<html>
<h1>User Information Page</h1>
<p>Looks like you've requested information for the user with id <%= user_id %>.</p>
<p>Also, 1 + 1 = <%= 1 + 1 %></p>
<%= if user_id == "0" do %>
<%# we should tell everybody that user 0 is really cool %>
User zero is really cool!
<% end %>
</html>]]>
""", [user_id: user_id])
end
##########################
# routes
def route("GET", ["hello"], conn) do
conn
|> Plug.Conn.put_resp_header("Server", "Plug")
|> Plug.Conn.send_resp(200, "Hello, world!")
end
def route("GET", ["users", user_id], conn) do
# route for /users/
# conn |> Plug.Conn.send_resp(200, "You requested user #{user_id}")
page_contents = template_show_user(user_id)
conn |> Plug.Conn.put_resp_content_type("text/html") |> Plug.Conn.send_resp(200, page_contents)
end
def route(_method, _path, conn) do
conn |> Plug.Conn.send_resp(404, "Couldn't find that page, sorry!")
end
end