feat(rust): Configure when the module is shown (#2350)

This makes it possible to configure when the rust module is shown
based on the contents of a directory.

src/configs/rust.rs

@@ -8,6 +8,9 @@ pub struct RustConfig<'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 RustConfig<'a> {
@@ -17,6 +20,9 @@ impl<'a> RootModuleConfig<'a> for RustConfig<'a> {
             symbol: "🦀 ",
             style: "bold red",
             disabled: false,
+            detect_extensions: vec!["rs"],
+            detect_files: vec!["Cargo.toml"],
+            detect_folders: vec![],
         }
     }
 }

src/modules/rust.rs

@@ -10,23 +10,21 @@ use crate::configs::rust::RustConfig;
 use crate::formatter::StringFormatter;
 
 /// Creates a module with the current Rust version
-///
-/// Will display the Rust version if any of the following criteria are met:
-///     - Current directory contains a file with a `.rs` extension
-///     - Current directory contains a `Cargo.toml` file
 pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
+    let mut module = context.new_module("rust");
+    let config = RustConfig::try_load(module.config);
+
     let is_rs_project = context
         .try_begin_scan()?
-        .set_files(&["Cargo.toml"])
-        .set_extensions(&["rs"])
+        .set_files(&config.detect_files)
+        .set_extensions(&config.detect_extensions)
+        .set_folders(&config.detect_folders)
         .is_match();
 
     if !is_rs_project {
         return None;
     }
 
-    let mut module = context.new_module("rust");
-    let config = RustConfig::try_load(module.config);
     let parsed = StringFormatter::new(config.format).and_then(|formatter| {
         formatter
             .map_meta(|var, _| match var {