refactor completion and signature help using hooks

Author: pascalkuthe

Cargo.lock

@@ -51,7 +51,8 @@ Its settings will be merged with the configuration directory `config.toml` and t
 | `auto-completion` | Enable automatic pop up of auto-completion | `true` |
 | `auto-format` | Enable automatic formatting on save | `true` |
 | `auto-save` | Enable automatic saving on the focus moving away from Helix. Requires [focus event support](https://github.com/helix-editor/helix/wiki/Terminal-Support) from your terminal | `false` |
-| `idle-timeout` | Time in milliseconds since last keypress before idle timers trigger. Used for autocompletion, set to 0 for instant | `250` |
+| `idle-timeout` | Time in milliseconds since last keypress before idle timers trigger. | `250` |
+| `completion-timeout` | Time in milliseconds after typing a word character before completions are shown, set to 5 for instant.  | `250` |
 | `preview-completion-insert` | Whether to apply completion item instantly when selected | `true` |
 | `completion-trigger-len` | The min-length of word under cursor to trigger autocompletion | `2` |
 | `completion-replace` | Set to `true` to make completions always replace the entire word and not just the part before the cursor | `false` |

book/src/configuration.md

@@ -9,7 +9,7 @@ use helix_loader::{self, VERSION_AND_GIT_HASH};
 use helix_stdx::path;
 use lsp::{
     notification::DidChangeWorkspaceFolders, CodeActionCapabilityResolveSupport,
-    DidChangeWorkspaceFoldersParams, OneOf, PositionEncodingKind, WorkspaceFolder,
+    DidChangeWorkspaceFoldersParams, OneOf, PositionEncodingKind, SignatureHelp, WorkspaceFolder,
     WorkspaceFoldersChangeEvent,
 };
 use lsp_types as lsp;
@@ -999,6 +999,7 @@ impl Client {
         text_document: lsp::TextDocumentIdentifier,
         position: lsp::Position,
         work_done_token: Option<lsp::ProgressToken>,
+        context: lsp::CompletionContext,
     ) -> Option<impl Future<Output = Result<Value>>> {
         let capabilities = self.capabilities.get().unwrap();
 
@@ -1010,13 +1011,12 @@ impl Client {
                 text_document,
                 position,
             },
+            context: Some(context),
             // TODO: support these tokens by async receiving and updating the choice list
             work_done_progress_params: lsp::WorkDoneProgressParams { work_done_token },
             partial_result_params: lsp::PartialResultParams {
                 partial_result_token: None,
             },
-            context: None,
-            // lsp::CompletionContext { trigger_kind: , trigger_character: Some(), }
         };
 
         Some(self.call::<lsp::request::Completion>(params))
@@ -1063,7 +1063,7 @@ impl Client {
         text_document: lsp::TextDocumentIdentifier,
         position: lsp::Position,
         work_done_token: Option<lsp::ProgressToken>,
-    ) -> Option<impl Future<Output = Result<Value>>> {
+    ) -> Option<impl Future<Output = Result<Option<SignatureHelp>>>> {
         let capabilities = self.capabilities.get().unwrap();
 
         // Return early if the server does not support signature help.
@@ -1079,7 +1079,8 @@ impl Client {
             // lsp::SignatureHelpContext
         };
 
-        Some(self.call::<lsp::request::SignatureHelpRequest>(params))
+        let res = self.call::<lsp::request::SignatureHelpRequest>(params);
+        Some(async move { Ok(serde_json::from_value(res.await?)?) })
     }
 
     pub fn text_document_range_inlay_hints(

helix-lsp/src/client.rs

@@ -14,6 +14,7 @@ homepage.workspace = true
 [dependencies]
 dunce = "1.0"
 etcetera = "0.8"
+ropey = { version = "1.6.1", default-features = false }
 
 [dev-dependencies]
 tempfile = "3.9"

helix-stdx/Cargo.toml

@@ -1,2 +1,3 @@
 pub mod env;
 pub mod path;
+pub mod rope;

helix-stdx/src/lib.rs

@@ -0,0 +1,26 @@
+use ropey::RopeSlice;
+
+pub trait RopeSliceExt: Sized {
+    fn ends_with(self, text: &str) -> bool;
+    fn starts_with(self, text: &str) -> bool;
+}
+
+impl RopeSliceExt for RopeSlice<'_> {
+    fn ends_with(self, text: &str) -> bool {
+        let len = self.len_bytes();
+        if len < text.len() {
+            return false;
+        }
+        self.get_byte_slice(len - text.len()..)
+            .map_or(false, |end| end == text)
+    }
+
+    fn starts_with(self, text: &str) -> bool {
+        let len = self.len_bytes();
+        if len < text.len() {
+            return false;
+        }
+        self.get_byte_slice(..len - text.len())
+            .map_or(false, |start| start == text)
+    }
+}

helix-stdx/src/rope.rs

@@ -1,10 +1,6 @@
 use arc_swap::{access::Map, ArcSwap};
 use futures_util::Stream;
-use helix_core::{
-    chars::char_is_word,
-    diagnostic::{DiagnosticTag, NumberOrString},
-    pos_at_coords, syntax, Selection,
-};
+use helix_core::{diagnostic::Severity, pos_at_coords, syntax, Selection};
 use helix_lsp::{
     lsp::{self, notification::Notification},
     util::lsp_range_to_range,