vans163
Recompile project is compiletime ENVVAR changed?
Does anyone know how to force certain-files/project to recompile if compiletime envvars changed?
Example I have a config.exs like so
region = System.get_env("REGION", "us") |> String.to_atom()
config :app, :region, region
and code that uses it
defmodule MyModule do
if Application.compile_env!(:app, :region) == :us do
def lol() do "United" end
else
def lol() do "United in another language" end
end
end
I would like MyModule to recompile (outside a release setting) if REGION envvar changed.
Example doing
REGION=us iex -S mix
compile
REGION=us iex -S mix
nothing
REGION=ca iex -S mix
compile
REGION=us iex -S mix
compile
I can change compile_env to get_env, then the app just runs without recompiling anything. I rather not crash, and not false negative.
First Post!
Ljzn
The simple solution is write a compiler task to edit the code file each time to force recompile.
defmodule Mix.Tasks.Compile.ForceRc do
use Mix.Task
def run(_args) do
File.write("[path of your module]", " ", [:append])
IO.puts "edited"
end
end
run mix compile to load this module. Then add it before other compilers in mix.exs
compilers: [:force_rc, :phoenix, :gettext] ++ Mix.compilers(),
Then every time you run iex -S mix, the file you specified will be re-compile.
It is such a stupid solution 
Could someone tell me how to force elixir recompile a file, without changing the file content.
Most Liked
evadne
Note Elixir source, Mix.Tasks.Compile.App:
defp app_changed?(properties, mods, compile_env) do
Keyword.get(properties, :modules, []) != mods or
Keyword.get(properties, :compile_env, []) != compile_env
end
You can probably use this in conjunction with runtime configuration like in config/runtime.exs introduced as in Elixir 1.11, see Elixir v1.11 released - The Elixir programming language so stuff System.get_env(name) in config/runtime.exs and use Application.compile_env/3 to get it.
However IMO this is a smell and is best avoided
Last Post!
jsonmaur
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