Revert "fix(core): stop merging array toml config values (#1004)"

It breaks languages.toml merging

This reverts commit 4304b52ff8.

helix-core/src/lib.rs

@@ -103,7 +103,25 @@ pub fn cache_dir() -> std::path::PathBuf {
 pub fn merge_toml_values(left: toml::Value, right: toml::Value) -> toml::Value {
     use toml::Value;
 
+    fn get_name(v: &Value) -> Option<&str> {
+        v.get("name").and_then(Value::as_str)
+    }
+
     match (left, right) {
+        (Value::Array(mut left_items), Value::Array(right_items)) => {
+            left_items.reserve(right_items.len());
+            for rvalue in right_items {
+                let lvalue = get_name(&rvalue)
+                    .and_then(|rname| left_items.iter().position(|v| get_name(v) == Some(rname)))
+                    .map(|lpos| left_items.remove(lpos));
+                let mvalue = match lvalue {
+                    Some(lvalue) => merge_toml_values(lvalue, rvalue),
+                    None => rvalue,
+                };
+                left_items.push(mvalue);
+            }
+            Value::Array(left_items)
+        }
         (Value::Table(mut left_map), Value::Table(right_map)) => {
             for (rname, rvalue) in right_map {
                 match left_map.remove(&rname) {
@@ -131,13 +149,12 @@ mod merge_toml_tests {
     fn language_tomls() {
         use toml::Value;
 
-        const USER: &str = r#"
+        const USER: &str = "
         [[language]]
-        name = "typescript"
+        name = \"nix\"
-        test = "bbb"
+        test = \"bbb\"
-        indent = { tab-width = 4, unit = "    ", test = "aaa" }
+        indent = { tab-width = 4, unit = \"    \", test = \"aaa\" }
-        language-server = { command = "deno", args = ["lsp"] }
+        ";
-        "#;
 
         let base: Value = toml::from_slice(include_bytes!("../../languages.toml"))
             .expect("Couldn't parse built-in langauges config");
@@ -145,27 +162,23 @@ mod merge_toml_tests {
 
         let merged = merge_toml_values(base, user);
         let languages = merged.get("language").unwrap().as_array().unwrap();
-        let ts = languages
+        let nix = languages
             .iter()
-            .find(|v| v.get("name").unwrap().as_str().unwrap() == "typescript")
+            .find(|v| v.get("name").unwrap().as_str().unwrap() == "nix")
             .unwrap();
-        let ts_indent = ts.get("indent").unwrap();
+        let nix_indent = nix.get("indent").unwrap();
 
         // We changed tab-width and unit in indent so check them if they are the new values
-        assert_eq!(ts_indent.get("tab-width").unwrap().as_integer().unwrap(), 4);
-        assert_eq!(ts_indent.get("unit").unwrap().as_str().unwrap(), "    ");
-        // We added a new keys, so check them
-        assert_eq!(ts.get("test").unwrap().as_str().unwrap(), "bbb");
-        assert_eq!(ts_indent.get("test").unwrap().as_str().unwrap(), "aaa");
         assert_eq!(
-            ts.get("language-server")
+            nix_indent.get("tab-width").unwrap().as_integer().unwrap(),
-                .unwrap()
+            4
-                .get("args")
-                .unwrap()
-                .as_array()
-                .unwrap(),
-            &vec![Value::String("lsp".into())],
         );
+        assert_eq!(nix_indent.get("unit").unwrap().as_str().unwrap(), "    ");
+        // We added a new keys, so check them
+        assert_eq!(nix.get("test").unwrap().as_str().unwrap(), "bbb");
+        assert_eq!(nix_indent.get("test").unwrap().as_str().unwrap(), "aaa");
+        // We didn't change comment-token so it should be same
+        assert_eq!(nix.get("comment-token").unwrap().as_str().unwrap(), "#");
     }
 }