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Elixir Z-Wave library
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lib/grizzly/autocomplete.ex
defmodule Grizzly.Autocomplete do
@moduledoc """
Adds command completion to the default IEx autocomplete.
This module augments the IEx autocompletion logic to complete Grizzly
command names inside of `Grizzly.send_command/4` calls.
Call `Grizzly.Autocomplete.set_expand_fun()` (or put it in your `.iex.exs`) to
enable this feature.
"""
require Logger
def expand(expr) do
str = Enum.reverse(expr) |> to_string()
with {:unquoted_atom, partial_command_name} <- Code.Fragment.cursor_context(str),
{:ok, ast} = Code.Fragment.container_cursor_to_quoted(str),
true <- in_send_command_call?(ast) do
partial_command_name
|> to_string()
|> expand_command()
else
_ ->
IEx.Autocomplete.expand(expr)
end
rescue
err ->
Logger.error("""
Error during autocomplete expansion: #{inspect(err)}
Ejecting `Grizzly.Autocomplete` and restoring default IEx autocomplete.
""")
gl = Process.group_leader()
_ = :io.setopts(gl, expand_fun: &IEx.Autocomplete.expand/1)
end
defp expand_command(command_prefix) do
expansions =
Enum.reduce(Grizzly.list_commands(), [], fn command, acc ->
command_str = Atom.to_string(command)
if String.starts_with?(command_str, command_prefix) do
[command_str | acc]
else
acc
end
end)
prefix_len = String.length(command_prefix)
case expansions do
[] ->
{:no, ~c"", []}
[^command_prefix] ->
{:no, ~c"", []}
[unique] ->
completion = unique |> String.to_charlist() |> Enum.drop(prefix_len)
{:yes, completion, []}
list ->
list = Enum.map(list, &String.to_charlist/1)
completion = list |> Enum.reduce(&common_prefix/2) |> Enum.drop(prefix_len)
{:yes, completion, list}
end
end
# Find the common prefix for two charlists
defp common_prefix(a, b, acc \\ [])
defp common_prefix([h | t1], [h | t2], acc) do
common_prefix(t1, t2, [h | acc])
end
defp common_prefix(_, _, acc) do
Enum.reverse(acc)
end
defp in_send_command_call?(ast) do
{_, yes?} =
Macro.postwalk(ast, false, fn
{{:., _, [{:__aliases__, _, [:Grizzly]}, :send_command]}, _, [_, {:__cursor__, _, _}]},
acc ->
{ast, acc || true}
ast, acc ->
{ast, acc || false}
end)
yes?
end
# The following are adapted from IEx.Autocomplete
# Provides a helper function that is injected into connecting remote nodes to
# properly handle autocompletion.
@doc false
def remsh(node) do
fn e ->
case :rpc.call(node, Grizzly.Autocomplete, :expand, [e]) do
{:badrpc, _} -> {:no, ~c"", []}
r -> r
end
end
end
@spec set_expand_fun() :: :ok | {:error, any}
def set_expand_fun() do
gl = Process.group_leader()
expand_fun =
if node(gl) != node() do
Grizzly.Autocomplete.remsh(node())
else
&Grizzly.Autocomplete.expand/1
end
# expand_fun is not supported by a shell variant
# on Windows, so we do two IO calls, not caring
# about the result of the expand_fun one.
_ = :io.setopts(gl, expand_fun: expand_fun)
:io.setopts(gl, binary: true, encoding: :unicode)
end
end