fix: configuration doctest for custom group_imports

Configurations.md

@@ -2294,27 +2294,16 @@ use std::sync::Arc;
 use uuid::Uuid;
 ```
 
-#### Example for custom groups:
+#### `[ ["$std::*", "proc_macro::*"], ["*"], ["my_crate::*", "crate::*::xyz"], ["$crate::*"] ]`:
 
-Discard existing import groups, and create groups as specified by the wildcarded list.
+Discards existing import groups, and create groups as specified by the wildcarded list.
 Handy aliases are supported:
 
 - `$std` prefix is an alias for standard library (i.e `std`, `core`, `alloc`);
 - `$crate` prefix is an alias for crate-local modules (i.e `self`, `crate`, `super`).
 - `*` is a special fallback group (i.e used if no other group matches), could only be specified once.
 
-For a given config:
-
-```toml
-group_imports = [
-    ["$std::*", "proc_macro::*"],
-    ["*"],
-    ["my_crate::*", "crate::*::xyz"],
-    ["$crate::*"],
-]
-```
-
-The following order would be set:
+With the provided config the following order would be set:
 
 ```rust
 use proc_macro::Span;

config_proc_macro/src/item_enum.rs

@@ -46,8 +46,22 @@ pub fn define_config_type_on_enum(args: &Args, em: &syn::ItemEnum) -> syn::Resul
         .unwrap_or_default();
 
     let impl_doc_hint = impl_doc_hint(&em.ident, &em.variants);
-    let impl_from_str = impl_from_str(&em.ident, &em.variants);
-    let impl_display = impl_display(&em.ident, &em.variants);
+    let impl_from_str = if args
+        .skip_derives()
+        .all(|s| !"std::str::FromStr".ends_with(s))
+    {
+        impl_from_str(&em.ident, &em.variants)
+    } else {
+        Default::default()
+    };
+    let impl_display = if args
+        .skip_derives()
+        .all(|s| !"std::str::Display".ends_with(s))
+    {
+        impl_display(&em.ident, &em.variants)
+    } else {
+        Default::default()
+    };
 
     Ok(quote! {
         #[allow(non_snake_case)]

src/config/options.rs

@@ -104,7 +104,7 @@ impl Density {
     }
 }
 
-#[config_type(skip_derive(Copy, Serialize, Deserialize))]
+#[config_type(skip_derive(Copy, Serialize, Deserialize, FromStr))]
 /// Configuration for import groups, i.e. sets of imports separated by newlines.
 pub enum GroupImportsTactic {
     /// Keep groups as they are.
@@ -219,6 +219,24 @@ impl<'de> Deserialize<'de> for GroupImportsTactic {
     }
 }
 
+impl std::str::FromStr for GroupImportsTactic {
+    type Err = anyhow::Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(match s {
+            "Preserve" => GroupImportsTactic::Preserve,
+            "StdExternalCrate" => GroupImportsTactic::StdExternalCrate,
+            "One" => GroupImportsTactic::One,
+            line => serde_json::from_str::<Vec<Vec<String>>>(&line)?
+                .into_iter()
+                .map(TryFrom::try_from)
+                .collect::<Result<Vec<WildcardGroup>, _>>()
+                .map(WildcardGroups)
+                .map(GroupImportsTactic::Wildcards)?,
+        })
+    }
+}
+
 #[derive(Debug, Clone, Eq, PartialEq)]
 pub struct WildcardGroups(Vec<WildcardGroup>);