Consistently use `helix_core::config::default_{lang,config}_loader`

This avoids using any custom configuration in a user-defined
`languages.toml` config for the syntax test cases. The test cases should
only use the builtin `languages.toml` config.

Also the xtask crate reimplemented `default_lang_loader` and
`default_lang_config`. These functions are replaced with calls into
`helix_core`.

helix-core/src/syntax.rs

@@ -964,7 +964,7 @@ mod test {
     use super::*;
     use crate::{Rope, Transaction};
 
-    static LOADER: Lazy<Loader> = Lazy::new(|| crate::config::user_lang_loader().unwrap());
+    static LOADER: Lazy<Loader> = Lazy::new(crate::config::default_lang_loader);
 
     #[test]
     fn test_textobject_queries() {

xtask/src/docgen.rs

@@ -129,7 +129,7 @@ pub fn lang_features() -> Result<String, DynError> {
     cols.push("Default language servers".to_owned());
 
     md.push_str(&md_table_heading(&cols));
-    let config = helpers::lang_config();
+    let config = helix_core::config::default_lang_config();
 
     let mut langs = config
         .language

xtask/src/helpers.rs

@@ -1,7 +1,6 @@
 use std::path::{Path, PathBuf};
 
 use crate::path;
-use helix_core::syntax::{self, config::Configuration as LangConfig};
 use helix_term::health::TsFeature;
 
 /// Get the list of languages that support a particular tree-sitter
@@ -37,12 +36,3 @@ pub fn find_files(dir: &Path, filename: &str) -> Vec<PathBuf> {
         .flatten()
         .collect()
 }
-
-pub fn lang_config() -> LangConfig {
-    let text = std::fs::read_to_string(path::lang_config()).unwrap();
-    toml::from_str(&text).unwrap()
-}
-
-pub fn syn_loader() -> syntax::Loader {
-    syntax::Loader::new(lang_config()).unwrap()
-}

xtask/src/main.rs

@@ -22,7 +22,7 @@ pub mod tasks {
         use helix_core::syntax::LanguageData;
 
         let languages_to_check: HashSet<_> = languages.collect();
-        let loader = crate::helpers::syn_loader();
+        let loader = helix_core::config::default_lang_loader();
         for (_language, lang_data) in loader.languages() {
             if !languages_to_check.is_empty()
                 && !languages_to_check.contains(&lang_data.config().language_id)

xtask/src/path.rs

@@ -22,7 +22,3 @@ pub fn ts_queries() -> PathBuf {
 pub fn themes() -> PathBuf {
     runtime().join("themes")
 }
-
-pub fn lang_config() -> PathBuf {
-    project_root().join("languages.toml")
-}