perf(lua): Lazy eval lua (#2185)

* perf(lua): evaluate version lazily

* fix(lua): update format string

* test(lua): update tests

Co-authored-by: Moritz Vetter <mv@3yourmind.com>

3 files changed, 16 insertions, 14 deletions

diff --git a/docs/config/README.md b/docs/config/README.md
index db507b828..4eb8f3cb5 100644
--- a/docs/config/README.md
+++ b/docs/config/README.md
@@ -1555,13 +1555,13 @@ The module will be shown if any of the following conditions are met:
 
 ### Options
 
-| Option       | Default                            | Description                                                                   |
-| ------------ | ---------------------------------- | ----------------------------------------------------------------------------- |
-| `format`     | `"via [$symbol$version]($style) "` | The format for the module.                                                    |
-| `symbol`     | `"🌙 "`                            | A format string representing the symbol of Lua.                               |
-| `style`      | `"bold blue"`                      | The style for the module.                                                     |
-| `lua_binary` | `"lua"`                            | Configures the lua binary that Starship executes when getting the version.    |
-| `disabled`   | `false`                            | Disables the `lua` module.                                                    |
+| Option       | Default                              | Description                                                                   |
+| ------------ | ------------------------------------ | ----------------------------------------------------------------------------- |
+| `format`     | `"via [$symbol($version )]($style)"` | The format for the module.                                                    |
+| `symbol`     | `"🌙 "`                              | A format string representing the symbol of Lua.                               |
+| `style`      | `"bold blue"`                        | The style for the module.                                                     |
+| `lua_binary` | `"lua"`                              | Configures the lua binary that Starship executes when getting the version.    |
+| `disabled`   | `false`                              | Disables the `lua` module.                                                    |
 
 ### Variables
 
diff --git a/src/configs/lua.rs b/src/configs/lua.rs
index fb715f470..6ba8593f9 100644
--- a/src/configs/lua.rs
+++ b/src/configs/lua.rs
@@ -14,7 +14,7 @@ pub struct LuaConfig<'a> {
 impl<'a> RootModuleConfig<'a> for LuaConfig<'a> {
     fn new() -> Self {
         LuaConfig {
-            format: "via [$symbol$version]($style) ",
+            format: "via [$symbol($version )]($style)",
             symbol: "🌙 ",
             style: "bold blue",
             lua_binary: "lua",
diff --git a/src/modules/lua.rs b/src/modules/lua.rs
index 9bea92668..3b30eb1c6 100644
--- a/src/modules/lua.rs
+++ b/src/modules/lua.rs
@@ -27,7 +27,6 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
 
     let mut module = context.new_module("lua");
     let config = LuaConfig::try_load(module.config);
-    let lua_version = format_lua_version(&get_lua_version(&config.lua_binary)?)?;
     let parsed = StringFormatter::new(config.format).and_then(|formatter| {
         formatter
             .map_meta(|var, _| match var {
@@ -39,7 +38,10 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
                 _ => None,
             })
             .map(|variable| match variable {
-                "version" => Some(Ok(&lua_version)),
+                "version" => {
+                    let lua_version = format_lua_version(&get_lua_version(&config.lua_binary)?)?;
+                    Some(Ok(lua_version))
+                }
                 _ => None,
             })
             .parse(None)
@@ -103,7 +105,7 @@ mod tests {
         let dir = tempfile::tempdir()?;
         File::create(dir.path().join("main.lua"))?.sync_all()?;
         let actual = ModuleRenderer::new("lua").path(dir.path()).collect();
-        let expected = Some(format!("via {} ", Color::Blue.bold().paint("🌙 v5.4.0")));
+        let expected = Some(format!("via {}", Color::Blue.bold().paint("🌙 v5.4.0 ")));
         assert_eq!(expected, actual);
         dir.close()
     }
@@ -114,7 +116,7 @@ mod tests {
         File::create(dir.path().join(".lua-version"))?.sync_all()?;
 
         let actual = ModuleRenderer::new("lua").path(dir.path()).collect();
-        let expected = Some(format!("via {} ", Color::Blue.bold().paint("🌙 v5.4.0")));
+        let expected = Some(format!("via {}", Color::Blue.bold().paint("🌙 v5.4.0 ")));
         assert_eq!(expected, actual);
         dir.close()
     }
@@ -126,7 +128,7 @@ mod tests {
         fs::create_dir_all(&lua_dir)?;
 
         let actual = ModuleRenderer::new("lua").path(dir.path()).collect();
-        let expected = Some(format!("via {} ", Color::Blue.bold().paint("🌙 v5.4.0")));
+        let expected = Some(format!("via {}", Color::Blue.bold().paint("🌙 v5.4.0 ")));
         assert_eq!(expected, actual);
         dir.close()
     }
@@ -146,7 +148,7 @@ mod tests {
             .config(config)
             .collect();
 
-        let expected = Some(format!("via {} ", Color::Blue.bold().paint("🌙 v2.0.5")));
+        let expected = Some(format!("via {}", Color::Blue.bold().paint("🌙 v2.0.5 ")));
         assert_eq!(expected, actual);
         dir.close()
     }