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Development tooling for the Mob mobile framework
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lib/mob_dev/source_watch.ex
defmodule MobDev.SourceWatch do
@moduledoc false
# Helpers shared by `mix mob.watch` and `MobDev.Server.WatchWorker` —
# both need a snapshot of `lib/**/*.ex` mtimes plus a diff against a
# previous snapshot. Each had its own copy until ex_dna flagged them.
@doc """
Take a snapshot of every `lib/**/*.ex` file's mtime (posix seconds).
Files that fail to stat get an mtime of 0.
"""
@spec snapshot() :: %{Path.t() => integer()}
def snapshot do
Map.new(Path.wildcard("lib/**/*.ex"), fn path ->
mtime =
case File.stat(path, time: :posix) do
{:ok, %{mtime: t}} -> t
_ -> 0
end
{path, mtime}
end)
end
@doc """
Return the file paths whose mtime in `current` differs from `old`.
"""
@spec diff(map(), map()) :: [Path.t()]
def diff(old, current) do
current
|> Enum.filter(fn {path, mtime} -> Map.get(old, path) != mtime end)
|> Enum.map(&elem(&1, 0))
end
end