feat(elixir): Configure when module is shown (#2340)

This makes it possible to configure when the elixir module is shown
based on the contents of a directory. This should make it possible to be
a lot more granular when configuring the module.

src/configs/elixir.rs

@@ -8,6 +8,9 @@ pub struct ElixirConfig<'a> {
     pub symbol: &'a str,
     pub style: &'a str,
     pub disabled: bool,
+    pub detect_extensions: Vec<&'a str>,
+    pub detect_files: Vec<&'a str>,
+    pub detect_folders: Vec<&'a str>,
 }
 
 impl<'a> RootModuleConfig<'a> for ElixirConfig<'a> {
@@ -17,6 +20,9 @@ impl<'a> RootModuleConfig<'a> for ElixirConfig<'a> {
             symbol: "💧 ",
             style: "bold purple",
             disabled: false,
+            detect_extensions: vec![],
+            detect_files: vec!["mix.exs"],
+            detect_folders: vec![],
         }
     }
 }

src/modules/elixir.rs

@@ -12,11 +12,16 @@ Erlang/OTP (?P<otp>\\d+)[^\\n]+
 Elixir (?P<elixir>\\d[.\\d]+).*";
 
 /// Create a module with the current Elixir version
-///
-/// Will display the Elixir version if any of the following criteria are met:
-///     - Current directory contains a `mix.exs` file
 pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
-    let is_elixir_project = context.try_begin_scan()?.set_files(&["mix.exs"]).is_match();
+    let mut module = context.new_module("elixir");
+    let config = ElixirConfig::try_load(module.config);
+
+    let is_elixir_project = context
+        .try_begin_scan()?
+        .set_files(&config.detect_files)
+        .set_extensions(&config.detect_extensions)
+        .set_folders(&config.detect_folders)
+        .is_match();
 
     if !is_elixir_project {
         return None;
@@ -24,8 +29,6 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
 
     let versions = Lazy::new(|| get_elixir_version(context));
 
-    let mut module = context.new_module("elixir");
-    let config = ElixirConfig::try_load(module.config);
     let parsed = StringFormatter::new(config.format).and_then(|formatter| {
         formatter
             .map_meta(|var, _| match var {