fix: Lazy load git repo and only run module if not disabled (#306)

A couple of optimizations are done in this PR. One, we now will check config ahead of time to see if a module is disabled before running any module code. Also, we won't try to discover a git repository unless the module requests access to it.

src/modules/git_status.rs

@@ -30,11 +30,12 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     const GIT_STATUS_RENAMED: &str = "»";
     const GIT_STATUS_DELETED: &str = "✘";
 
-    let branch_name = context.branch_name.as_ref()?;
-    let repo_root = context.repo_root.as_ref()?;
+    let repo = context.get_repo().ok()?;
+    let branch_name = repo.branch.as_ref()?;
+    let repo_root = repo.root.as_ref()?;
     let repository = Repository::open(repo_root).ok()?;
 
-    let mut module = context.new_module("git_status")?;
+    let mut module = context.new_module("git_status");
     let show_sync_count = module.config_value_bool("show_sync_count").unwrap_or(false);
     let module_style = module
         .config_value_style("style")
@@ -133,10 +134,10 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     }
 
     if module.is_empty() {
-        None
-    } else {
-        Some(module)
+        return None;
     }
+
+    Some(module)
 }
 
 /// Gets the bitflags associated with the repo's git status