feat(crystal): Configure when the module is shown (#2310)

* feat(crystal): Configure when the module is shown

This makes it possible to configure when the crystal 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.

* Update docs/config/README.md

Co-authored-by: David Knaack <davidkna@users.noreply.github.com>

Co-authored-by: David Knaack <davidkna@users.noreply.github.com>

3 files changed, 22 insertions, 16 deletions

diff --git a/docs/config/README.md b/docs/config/README.md
index 1a5958e7a..68b801383 100644
--- a/docs/config/README.md
+++ b/docs/config/README.md
@@ -569,19 +569,22 @@ format = "[$symbol$environment](dimmed green) "
 ## Crystal
 
 The `crystal` module shows the currently installed version of Crystal.
-The module will be shown if any of the following conditions are met:
+By default the module will be shown if any of the following conditions are met:
 
 - The current directory contains a `shard.yml` file
 - The current directory contains a `.cr` file
 
 ### Options
 
-| Option     | Default                              | Description                                               |
-| ---------- | ------------------------------------ | --------------------------------------------------------- |
-| `symbol`   | `"🔮 "`                              | The symbol used before displaying the version of crystal. |
-| `style`    | `"bold red"`                         | The style for the module.                                 |
-| `format`   | `"via [$symbol($version )]($style)"` | The format for the module.                                |
-| `disabled` | `false`                              | Disables the `crystal` module.                            |
+| Option              | Default                              | Description                                               |
+| ------------------- | ------------------------------------ | --------------------------------------------------------- |
+| `symbol`            | `"🔮 "`                              | The symbol used before displaying the version of crystal. |
+| `style`             | `"bold red"`                         | The style for the module.                                 |
+| `detect_extensions` | `["cr"]`                             | Which extensions should trigger this module.              |
+| `detect_files`      | `["shard.yml"]`                      | Which filenames should trigger this module.               |
+| `detect_folders`    | `[]`                                 | Which folders should trigger this module.                 |
+| `format`            | `"via [$symbol($version )]($style)"` | The format for the module.                                |
+| `disabled`          | `false`                              | Disables the `crystal` module.                            |
 
 ### Variables
 
diff --git a/src/configs/crystal.rs b/src/configs/crystal.rs
index 248f0ec4b..d135b9e5e 100644
--- a/src/configs/crystal.rs
+++ b/src/configs/crystal.rs
@@ -8,6 +8,9 @@ pub struct CrystalConfig<'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 CrystalConfig<'a> {
@@ -17,6 +20,9 @@ impl<'a> RootModuleConfig<'a> for CrystalConfig<'a> {
             symbol: "🔮 ",
             style: "bold red",
             disabled: false,
+            detect_extensions: vec!["cr"],
+            detect_files: vec!["shard.yml"],
+            detect_folders: vec![],
         }
     }
 }
diff --git a/src/modules/crystal.rs b/src/modules/crystal.rs
index 9ba121eba..8049580fc 100644
--- a/src/modules/crystal.rs
+++ b/src/modules/crystal.rs
@@ -4,24 +4,21 @@ use crate::configs::crystal::CrystalConfig;
 use crate::formatter::StringFormatter;
 
 /// Creates a module with the current Crystal version
-///
-/// Will display the Crystal version if any of the following criteria are met:
-///     - Current directory contains a `.cr` file
-///     - Current directory contains a `shard.yml` file
 pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
+    let mut module = context.new_module("crystal");
+    let config: CrystalConfig = CrystalConfig::try_load(module.config);
+
     let is_crystal_project = context
         .try_begin_scan()?
-        .set_files(&["shard.yml"])
-        .set_extensions(&["cr"])
+        .set_files(&config.detect_files)
+        .set_extensions(&config.detect_extensions)
+        .set_folders(&config.detect_folders)
         .is_match();
 
     if !is_crystal_project {
         return None;
     }
 
-    let mut module = context.new_module("crystal");
-    let config: CrystalConfig = CrystalConfig::try_load(module.config);
-
     let parsed = StringFormatter::new(config.format).and_then(|formatter| {
         formatter
             .map_meta(|variable, _| match variable {