lsp: generate_transaction_from_text_edits

1 files changed, 27 insertions, 2 deletions

diff --git a/helix-lsp/src/lib.rs b/helix-lsp/src/lib.rs
index c56721a5..27a5e046 100644
--- a/helix-lsp/src/lib.rs
+++ b/helix-lsp/src/lib.rs
@@ -28,19 +28,44 @@ pub enum Error {
 
 pub mod util {
     use super::*;
+    use helix_core::{RopeSlice, State, Transaction};
 
-    pub fn lsp_pos_to_pos(doc: &helix_core::RopeSlice, pos: lsp::Position) -> usize {
+    pub fn lsp_pos_to_pos(doc: &RopeSlice, pos: lsp::Position) -> usize {
         let line = doc.line_to_char(pos.line as usize);
         let line_start = doc.char_to_utf16_cu(line);
         doc.utf16_cu_to_char(pos.character as usize + line_start)
     }
-    pub fn pos_to_lsp_pos(doc: &helix_core::RopeSlice, pos: usize) -> lsp::Position {
+    pub fn pos_to_lsp_pos(doc: &RopeSlice, pos: usize) -> lsp::Position {
         let line = doc.char_to_line(pos);
         let line_start = doc.char_to_utf16_cu(line);
         let col = doc.char_to_utf16_cu(pos) - line_start;
 
         lsp::Position::new(line as u32, col as u32)
     }
+
+    pub fn generate_transaction_from_edits(
+        state: &State,
+        edits: Vec<lsp::TextEdit>,
+    ) -> Transaction {
+        let doc = state.doc.slice(..);
+        Transaction::change(
+            state,
+            edits.into_iter().map(|edit| {
+                // simplify "" into None for cleaner changesets
+                let replacement = if !edit.new_text.is_empty() {
+                    Some(edit.new_text.into())
+                } else {
+                    None
+                };
+
+                let start = lsp_pos_to_pos(&doc, edit.range.start);
+                let end = lsp_pos_to_pos(&doc, edit.range.end);
+                (start, end, replacement)
+            }),
+        )
+    }
+
+    // apply_insert_replace_edit
 }
 
 #[derive(Debug, PartialEq, Clone)]