diff options
Diffstat (limited to 'lib/mix/lib/mix/tasks/compile.elixir.ex')
| -rw-r--r-- | lib/mix/lib/mix/tasks/compile.elixir.ex | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/lib/mix/lib/mix/tasks/compile.elixir.ex b/lib/mix/lib/mix/tasks/compile.elixir.ex index 87776af56..a8d1ac05e 100644 --- a/lib/mix/lib/mix/tasks/compile.elixir.ex +++ b/lib/mix/lib/mix/tasks/compile.elixir.ex @@ -9,19 +9,27 @@ defmodule Mix.Tasks.Compile.Elixir do Elixir is smart enough to recompile only files that have changed and their dependencies. This means if `lib/a.ex` is invoking - a function defined over `lib/b.ex`, whenever `lib/b.ex` changes, - `lib/a.ex` is also recompiled. + a function defined over `lib/b.ex` at compile time, whenever + `lib/b.ex` changes, `lib/a.ex` is also recompiled. - Note it is important to recompile a file's dependencies as - there are often compile time dependencies between them. + Note Elixir considers a file as changed if its source file has + changed on disk since the last compilation AND its contents are + no longer the same. + + ## `@external_resource` + + If a module depends on external files, those can be annotated + with the `@external_resource` module attribute. If these files + change, the Elixir module is automatically recompiled. ## `__mix_recompile__?/0` A module may export a `__mix_recompile__?/0` function that can cause the module to be recompiled using custom rules. For example, - `@external_resource` already adds a compile-time dependency on an - external file, however, to depend on a _dynamic_ list of files we - can do: + to recompile whenever a file is changed in a given directory, you + can use a combination of `@external_resource` for existing files + and a `__mix_recompile__?/0` check to verify when new entries are + added to the directory itself: defmodule MyModule do paths = Path.wildcard("*.txt") |