Add config option.

It might actually be better to have a three-way option.

Author: MattX

Configurations.md

@@ -2008,6 +2008,33 @@ use dolor;
 use sit;
 ```
 
+## `reorder_imports_opinionated`
+
+Reorder imports, creating three groups for:
+- std (core, alloc would also fit here)
+- external crates
+- this module.
+
+Within each group, imports are sorted as with `reorder_imports`.
+
+This has no effect is `reorder_imports` is `false`.
+
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No
+
+#### `true`:
+
+```rust
+use lorem; // TODO
+```
+
+#### `false` (default):
+
+```rust
+use lorem; // TODO
+```
+
 
 ## `reorder_modules`
 

src/config.rs

@@ -81,6 +81,7 @@ create_config! {
 
     // Ordering
     reorder_imports: bool, true, true, "Reorder import and extern crate statements alphabetically";
+    reorder_imports_opinionated: bool, false, false, "Reorder imports in blocks";
     reorder_modules: bool, true, true, "Reorder module statements alphabetically in group";
     reorder_impl_items: bool, false, false, "Reorder impl items";
 
@@ -594,6 +595,7 @@ imports_indent = "Block"
 imports_layout = "Mixed"
 merge_imports = false
 reorder_imports = true
+reorder_imports_opinionated = false
 reorder_modules = true
 reorder_impl_items = false
 type_punctuation_density = "Wide"