Add runtime language configuration (#1794) (#1866)

* Add runtime language configuration (#1794)

* Add set-language typable command to change the language of current buffer.
* Add completer for available language options.

* Update set-language to refresh language server as well

* Add language id based config lookup on `syntax::Loader`.
* Add `Document::set_language3` to set programming language based on language
  id.
* Update `Editor::refresh_language_server` to try language detection only if
  language is not already set.

* Remove language detection from Editor::refresh_language_server

* Move document language detection to where the scratch buffer is saved.
* Rename Document::set_language3 to Document::set_language_by_language_id.

* Remove unnecessary clone in completers::language

1 files changed, 11 insertions, 0 deletions

diff --git a/helix-core/src/syntax.rs b/helix-core/src/syntax.rs
index e736b370..bb0073e1 100644
--- a/helix-core/src/syntax.rs
+++ b/helix-core/src/syntax.rs
@@ -504,6 +504,13 @@ impl Loader {
             .cloned()
     }
 
+    pub fn language_config_for_language_id(&self, id: &str) -> Option<Arc<LanguageConfiguration>> {
+        self.language_configs
+            .iter()
+            .find(|config| config.language_id == id)
+            .cloned()
+    }
+
     pub fn language_configuration_for_injection_string(
         &self,
         string: &str,
@@ -529,6 +536,10 @@ impl Loader {
         None
     }
 
+    pub fn language_configs(&self) -> impl Iterator<Item = &Arc<LanguageConfiguration>> {
+        self.language_configs.iter()
+    }
+
     pub fn set_scopes(&self, scopes: Vec<String>) {
         self.scopes.store(Arc::new(scopes));