refactor completion and signature help using hooks

1 files changed, 8 insertions, 148 deletions

diff --git a/helix-term/src/commands/lsp.rs b/helix-term/src/commands/lsp.rs
index 051cdcd3..de2f0e5e 100644
--- a/helix-term/src/commands/lsp.rs
+++ b/helix-term/src/commands/lsp.rs
@@ -1,4 +1,4 @@
-use futures_util::{future::BoxFuture, stream::FuturesUnordered, FutureExt};
+use futures_util::{stream::FuturesUnordered, FutureExt};
 use helix_lsp::{
     block_on,
     lsp::{
@@ -8,21 +8,21 @@ use helix_lsp::{
     util::{diagnostic_to_lsp_diagnostic, lsp_range_to_range, range_to_lsp_range},
     Client, OffsetEncoding,
 };
-use serde_json::Value;
 use tokio_stream::StreamExt;
 use tui::{
     text::{Span, Spans},
     widgets::Row,
 };
 
-use super::{align_view, push_jump, Align, Context, Editor, Open};
+use super::{align_view, push_jump, Align, Context, Editor};
 
 use helix_core::{syntax::LanguageServerFeature, text_annotations::InlineAnnotation, Selection};
 use helix_stdx::path;
 use helix_view::{
-    document::{DocumentInlayHints, DocumentInlayHintsId, Mode},
+    document::{DocumentInlayHints, DocumentInlayHintsId},
     editor::Action,
     graphics::Margin,
+    handlers::lsp::SignatureHelpInvoked,
     theme::Style,
     Document, View,
 };
@@ -30,10 +30,7 @@ use helix_view::{
 use crate::{
     compositor::{self, Compositor},
     job::Callback,
-    ui::{
-        self, lsp::SignatureHelp, overlay::overlaid, DynamicPicker, FileLocation, Picker, Popup,
-        PromptEvent,
-    },
+    ui::{self, overlay::overlaid, DynamicPicker, FileLocation, Picker, Popup, PromptEvent},
 };
 
 use std::{
@@ -42,7 +39,6 @@ use std::{
     fmt::Write,
     future::Future,
     path::PathBuf,
-    sync::Arc,
 };
 
 /// Gets the first language server that is attached to a document which supports a specific feature.
@@ -1132,146 +1128,10 @@ pub fn goto_reference(cx: &mut Context) {
     );
 }
 
-#[derive(PartialEq, Eq, Clone, Copy)]
-pub enum SignatureHelpInvoked {
-    Manual,
-    Automatic,
-}
-
 pub fn signature_help(cx: &mut Context) {
-    signature_help_impl(cx, SignatureHelpInvoked::Manual)
-}
-
-pub fn signature_help_impl(cx: &mut Context, invoked: SignatureHelpInvoked) {
-    let (view, doc) = current!(cx.editor);
-
-    // TODO merge multiple language server signature help into one instead of just taking the first language server that supports it
-    let future = doc
-        .language_servers_with_feature(LanguageServerFeature::SignatureHelp)
-        .find_map(|language_server| {
-            let pos = doc.position(view.id, language_server.offset_encoding());
-            language_server.text_document_signature_help(doc.identifier(), pos, None)
-        });
-
-    let Some(future) = future else {
-        // Do not show the message if signature help was invoked
-        // automatically on backspace, trigger characters, etc.
-        if invoked == SignatureHelpInvoked::Manual {
-            cx.editor
-                .set_error("No configured language server supports signature-help");
-        }
-        return;
-    };
-    signature_help_impl_with_future(cx, future.boxed(), invoked);
-}
-
-pub fn signature_help_impl_with_future(
-    cx: &mut Context,
-    future: BoxFuture<'static, helix_lsp::Result<Value>>,
-    invoked: SignatureHelpInvoked,
-) {
-    cx.callback(
-        future,
-        move |editor, compositor, response: Option<lsp::SignatureHelp>| {
-            let config = &editor.config();
-
-            if !(config.lsp.auto_signature_help
-                || SignatureHelp::visible_popup(compositor).is_some()
-                || invoked == SignatureHelpInvoked::Manual)
-            {
-                return;
-            }
-
-            // If the signature help invocation is automatic, don't show it outside of Insert Mode:
-            // it very probably means the server was a little slow to respond and the user has
-            // already moved on to something else, making a signature help popup will just be an
-            // annoyance, see https://github.com/helix-editor/helix/issues/3112
-            if invoked == SignatureHelpInvoked::Automatic && editor.mode != Mode::Insert {
-                return;
-            }
-
-            let response = match response {
-                // According to the spec the response should be None if there
-                // are no signatures, but some servers don't follow this.
-                Some(s) if !s.signatures.is_empty() => s,
-                _ => {
-                    compositor.remove(SignatureHelp::ID);
-                    return;
-                }
-            };
-            let doc = doc!(editor);
-            let language = doc.language_name().unwrap_or("");
-
-            let signature = match response
-                .signatures
-                .get(response.active_signature.unwrap_or(0) as usize)
-            {
-                Some(s) => s,
-                None => return,
-            };
-            let mut contents = SignatureHelp::new(
-                signature.label.clone(),
-                language.to_string(),
-                Arc::clone(&editor.syn_loader),
-            );
-
-            let signature_doc = if config.lsp.display_signature_help_docs {
-                signature.documentation.as_ref().map(|doc| match doc {
-                    lsp::Documentation::String(s) => s.clone(),
-                    lsp::Documentation::MarkupContent(markup) => markup.value.clone(),
-                })
-            } else {
-                None
-            };
-
-            contents.set_signature_doc(signature_doc);
-
-            let active_param_range = || -> Option<(usize, usize)> {
-                let param_idx = signature
-                    .active_parameter
-                    .or(response.active_parameter)
-                    .unwrap_or(0) as usize;
-                let param = signature.parameters.as_ref()?.get(param_idx)?;
-                match &param.label {
-                    lsp::ParameterLabel::Simple(string) => {
-                        let start = signature.label.find(string.as_str())?;
-                        Some((start, start + string.len()))
-                    }
-                    lsp::ParameterLabel::LabelOffsets([start, end]) => {
-                        // LS sends offsets based on utf-16 based string representation
-                        // but highlighting in helix is done using byte offset.
-                        use helix_core::str_utils::char_to_byte_idx;
-                        let from = char_to_byte_idx(&signature.label, *start as usize);
-                        let to = char_to_byte_idx(&signature.label, *end as usize);
-                        Some((from, to))
-                    }
-                }
-            };
-            contents.set_active_param_range(active_param_range());
-
-            let old_popup = compositor.find_id::<Popup<SignatureHelp>>(SignatureHelp::ID);
-            let mut popup = Popup::new(SignatureHelp::ID, contents)
-                .position(old_popup.and_then(|p| p.get_position()))
-                .position_bias(Open::Above)
-                .ignore_escape_key(true);
-
-            // Don't create a popup if it intersects the auto-complete menu.
-            let size = compositor.size();
-            if compositor
-                .find::<ui::EditorView>()
-                .unwrap()
-                .completion
-                .as_mut()
-                .map(|completion| completion.area(size, editor))
-                .filter(|area| area.intersects(popup.area(size, editor)))
-                .is_some()
-            {
-                return;
-            }
-
-            compositor.replace_or_push(SignatureHelp::ID, popup);
-        },
-    );
+    cx.editor
+        .handlers
+        .trigger_signature_help(SignatureHelpInvoked::Manual, cx.editor)
 }
 
 pub fn hover(cx: &mut Context) {