feat(purescript): Configure when the module is shown (#2357)

This makes it possible to configure when the purescript 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/purescript.rs

@@ -8,6 +8,9 @@ pub struct PureScriptConfig<'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 PureScriptConfig<'a> {
@@ -17,6 +20,9 @@ impl<'a> RootModuleConfig<'a> for PureScriptConfig<'a> {
             symbol: "<=> ",
             style: "bold white",
             disabled: false,
+            detect_extensions: vec!["purs"],
+            detect_files: vec!["spago.dhall"],
+            detect_folders: vec![],
         }
     }
 }

src/modules/purescript.rs

@@ -4,24 +4,20 @@ use crate::configs::purescript::PureScriptConfig;
 use crate::formatter::StringFormatter;
 
 /// Creates a module with the current PureScript version
-///
-/// Will display the PureScript version if any of the following criteria are met:
-///     - Current directory contains a `spago.dhall` file
-///     - Current directory contains a `*.purs` files
 pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
+    let mut module = context.new_module("purescript");
+    let config: PureScriptConfig = PureScriptConfig::try_load(module.config);
     let is_purs_project = context
         .try_begin_scan()?
-        .set_files(&["spago.dhall"])
-        .set_extensions(&["purs"])
+        .set_files(&config.detect_files)
+        .set_folders(&config.detect_folders)
+        .set_extensions(&config.detect_extensions)
         .is_match();
 
     if !is_purs_project {
         return None;
     }
 
-    let mut module = context.new_module("purescript");
-    let config: PureScriptConfig = PureScriptConfig::try_load(module.config);
-
     let parsed = StringFormatter::new(config.format).and_then(|formatter| {
         formatter
             .map_meta(|variable, _| match variable {