Refactor grouping

crates/pile-config/src/lib.rs

@@ -1,7 +1,7 @@
 use serde::{Deserialize, Serialize};
 use std::{collections::HashMap, fmt::Debug, path::PathBuf};
 
-use crate::{objectpath::ObjectPath, pattern::GroupPattern};
+use crate::objectpath::ObjectPath;
 
 mod misc;
 pub use misc::*;
@@ -15,6 +15,15 @@ fn default_true() -> bool {
 	true
 }
 
+pub fn default_base() -> String {
+	"(.*)".to_owned()
+}
+
+#[expect(clippy::unwrap_used)]
+pub fn default_files() -> HashMap<Label, String> {
+	[(Label::new("item").unwrap(), "{base}".to_owned())].into()
+}
+
 #[test]
 #[expect(clippy::expect_used)]
 fn init_db_toml_valid() {
@@ -51,9 +60,17 @@ pub enum Source {
 		/// Must be relative.
 		path: PathBuf,
 
-		/// How to group files into items in this source
-		#[serde(default)]
-		pattern: GroupPattern,
+		/// Regex that extracts an item key from a file path.
+		/// - File paths are relative to `path`.
+		/// - The first group in this regex is the file's item key.
+		#[serde(default = "default_base")]
+		base_pattern: String,
+
+		/// Map of files included in each item.'
+		/// `{base}` is replaced with the string extraced by base_pattern.
+		/// Default is `{ item: "{base}" }`
+		#[serde(default = "default_files")]
+		files: HashMap<Label, String>,
 	},
 }