move attribute argument extractor to utils

Signed-off-by: Jason Volk <jason@zemos.net>

src/macros/config.rs

@@ -1,9 +1,4 @@
-use std::{
+use std::{collections::HashSet, fmt::Write as _, fs::OpenOptions, io::Write as _};
-	collections::{HashMap, HashSet},
-	fmt::Write as _,
-	fs::OpenOptions,
-	io::Write as _,
-};
 
 use proc_macro::TokenStream;
 use proc_macro2::Span;
@@ -13,7 +8,10 @@ use syn::{
 	ItemStruct, Lit, Meta, MetaList, MetaNameValue, Type, TypePath,
 };
 
-use crate::{utils::is_cargo_build, Result};
+use crate::{
+	utils::{get_simple_settings, is_cargo_build},
+	Result,
+};
 
 const UNDOCUMENTED: &str = "# This item is undocumented. Please contribute documentation for it.";
 
@@ -29,7 +27,7 @@ pub(super) fn example_generator(input: ItemStruct, args: &[Meta]) -> Result<Toke
 #[allow(clippy::needless_pass_by_value)]
 #[allow(unused_variables)]
 fn generate_example(input: &ItemStruct, args: &[Meta]) -> Result<()> {
-	let settings = get_settings(args);
+	let settings = get_simple_settings(args);
 
 	let filename = settings
 		.get("filename")
@@ -120,39 +118,6 @@ fn generate_example(input: &ItemStruct, args: &[Meta]) -> Result<()> {
 	Ok(())
 }
 
-fn get_settings(args: &[Meta]) -> HashMap<String, String> {
-	let mut map = HashMap::new();
-	for arg in args {
-		let Meta::NameValue(MetaNameValue {
-			path,
-			value,
-			..
-		}) = arg
-		else {
-			continue;
-		};
-
-		let Expr::Lit(
-			ExprLit {
-				lit: Lit::Str(str),
-				..
-			},
-			..,
-		) = value
-		else {
-			continue;
-		};
-
-		let Some(key) = path.segments.iter().next().map(|s| s.ident.clone()) else {
-			continue;
-		};
-
-		map.insert(key.to_string(), str.value());
-	}
-
-	map
-}
-
 fn get_default(field: &Field) -> Option<String> {
 	for attr in &field.attrs {
 		let Meta::List(MetaList {

src/macros/utils.rs

@@ -1,7 +1,39 @@
-use syn::{parse_str, Expr, Generics, Lit, Meta};
+use std::collections::HashMap;
+
+use syn::{parse_str, Expr, ExprLit, Generics, Lit, Meta, MetaNameValue};
 
 use crate::Result;
 
+pub(crate) fn get_simple_settings(args: &[Meta]) -> HashMap<String, String> {
+	args.iter().fold(HashMap::new(), |mut map, arg| {
+		let Meta::NameValue(MetaNameValue {
+			path,
+			value,
+			..
+		}) = arg
+		else {
+			return map;
+		};
+
+		let Expr::Lit(
+			ExprLit {
+				lit: Lit::Str(str),
+				..
+			},
+			..,
+		) = value
+		else {
+			return map;
+		};
+
+		if let Some(key) = path.segments.iter().next().map(|s| s.ident.clone()) {
+			map.insert(key.to_string(), str.value());
+		}
+
+		map
+	})
+}
+
 pub(crate) fn is_cargo_build() -> bool {
 	std::env::args()
 		.find(|flag| flag.starts_with("--emit"))