feat: Etask projection (#119)

Closes #92

Author: mhanberg

lua/elixir/projectionist/init.lua

@@ -1,4 +1,17 @@
 local M = {}
+if not vim.g.projectionist_transformations then
+  vim.g.projectionist_transformations = vim.empty_dict()
+end
+
+ElixirToolsProjectionistElixirModule = function(input)
+  return input:gsub("(%.%l)", string.upper)
+end
+
+vim.cmd([[
+function! g:projectionist_transformations.elixir_module(input, o) abort
+  return v:lua.ElixirToolsProjectionistElixirModule(a:input, a:o)
+endfunction
+]])
 
 local config = {
   ["mix.exs"] = {
@@ -139,10 +152,31 @@ local config = {
       type = "test",
       alternate = "lib/{}.ex",
       template = {
-        "defmodule {camelcase|capitalize|dot}Test do",
+        "defmodule {camelcase|capitalize|dot|elixir_module}Test do",
         "  use ExUnit.Case, async: true",
         "",
-        "  alias {camelcase|capitalize|dot}",
+        "  alias {camelcase|capitalize|dot|elixir_module}",
+        "end",
+      },
+    },
+    ["lib/mix/tasks/*.ex"] = {
+      type = "task",
+      alternate = "test/mix/tasks/{}_test.exs",
+      template = {
+        "defmodule Mix.Tasks.{camelcase|capitalize|dot|elixir_module} do",
+        [[  use Mix.Task]],
+        "",
+        [[  @shortdoc "{}"]],
+        "",
+        [[  @moduledoc """]],
+        [[  {}]],
+        [[  """]],
+        "",
+        [[  @impl true]],
+        [[  @doc false]],
+        [[  def run(argv) do]],
+        "",
+        [[  end]],
         "end",
       },
     },

tests/projectionist_spec.lua

@@ -65,4 +65,37 @@ describe("projectionist", function()
       { "defmodule ProjectAWeb.UserLive do", "  use ProjectAWeb, :live_view", "end" }
     )
   end)
+
+  it("Etask", function()
+    vim.cmd.Etask("foo.bar")
+    vim.cmd.write()
+
+    assert.are.same(vim.fn.readfile("lib/mix/tasks/foo.bar.ex"), {
+      "defmodule Mix.Tasks.Foo.Bar do",
+      [[  use Mix.Task]],
+      "",
+      [[  @shortdoc "foo.bar"]],
+      "",
+      [[  @moduledoc """]],
+      [[  foo.bar]],
+      [[  """]],
+      "",
+      [[  @impl true]],
+      [[  @doc false]],
+      [[  def run(argv) do]],
+      "",
+      [[  end]],
+      "end",
+    })
+
+    vim.cmd([[call feedkeys("1\<cr>", "t") | A | write]])
+
+    assert.are.same(vim.fn.readfile("test/mix/tasks/foo.bar_test.exs"), {
+      "defmodule Mix.Tasks.Foo.BarTest do",
+      [[  use ExUnit.Case, async: true]],
+      "",
+      [[  alias Mix.Tasks.Foo.Bar]],
+      "end",
+    })
+  end)
 end)