53 lines
1.4 KiB
Elixir
53 lines
1.4 KiB
Elixir
defmodule Watcher do
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use GenServer
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def start_link() do
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GenServer.start_link(__MODULE__, dirs: ["lib/koans"])
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end
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def init(args) do
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{:ok, watcher_pid} = FileSystem.start_link(args)
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FileSystem.subscribe(watcher_pid)
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{:ok, %{watcher_pid: watcher_pid}}
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end
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def handle_info({:file_event, watcher_pid, {path, events}}, %{watcher_pid: watcher_pid} = state) do
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# respond to renamed as well due to that some editors use temporary files for atomic writes (ex: TextMate)
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if Enum.member?(events, :modified) || Enum.member?(events, :renamed) do
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path |> normalize |> reload
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end
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{:noreply, state}
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end
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defp reload(file) do
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if Path.extname(file) == ".ex" do
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try do
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file
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|> portable_load_file
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|> Enum.map(&elem(&1, 0))
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|> Enum.find(&Runner.koan?/1)
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|> Runner.modules_to_run()
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|> Runner.run()
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rescue
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e -> Display.show_compile_error(e)
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end
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end
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end
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# Elixir 1.7 deprecates Code.load_file in favor of Code.compile_file. In
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# order to avoid the depecation warnings while maintaining backwards
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# compatibility, we check the sytem version and execute conditionally.
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defp portable_load_file(file) do
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if Version.match?(System.version(), "~> 1.7") do
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Code.compile_file(file)
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else
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Code.load_file(file)
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end
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end
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defp normalize(file) do
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String.replace_suffix(file, "___jb_tmp___", "")
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end
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end
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