4 files changed, 74 insertions, 19 deletions

diff --git a/editors/code/src/commands/index.ts b/editors/code/src/commands/index.ts
index bdb7fc3b0..abb53a248 100644
--- a/editors/code/src/commands/index.ts
+++ b/editors/code/src/commands/index.ts
@@ -4,6 +4,7 @@ import * as ra from '../rust-analyzer-api';
 
 import { Ctx, Cmd } from '../ctx';
 import * as sourceChange from '../source_change';
+import { assert } from '../util';
 
 export * from './analyzer_status';
 export * from './matching_brace';
@@ -40,14 +41,65 @@ export function applySourceChange(ctx: Ctx): Cmd {
     };
 }
 
-export function selectAndApplySourceChange(ctx: Ctx): Cmd {
-    return async (changes: ra.SourceChange[]) => {
-        if (changes.length === 1) {
-            await sourceChange.applySourceChange(ctx, changes[0]);
-        } else if (changes.length > 0) {
-            const selectedChange = await vscode.window.showQuickPick(changes);
-            if (!selectedChange) return;
-            await sourceChange.applySourceChange(ctx, selectedChange);
-        }
+export function applyActionGroup(_ctx: Ctx): Cmd {
+    return async (actions: { label: string; edit: vscode.WorkspaceEdit }[]) => {
+        const selectedAction = await vscode.window.showQuickPick(actions);
+        if (!selectedAction) return;
+        await applySnippetWorkspaceEdit(selectedAction.edit);
+    };
+}
+
+export function applySnippetWorkspaceEditCommand(_ctx: Ctx): Cmd {
+    return async (edit: vscode.WorkspaceEdit) => {
+        await applySnippetWorkspaceEdit(edit);
     };
 }
+
+export async function applySnippetWorkspaceEdit(edit: vscode.WorkspaceEdit) {
+    assert(edit.entries().length === 1, `bad ws edit: ${JSON.stringify(edit)}`);
+    const [uri, edits] = edit.entries()[0];
+
+    const editor = vscode.window.visibleTextEditors.find((it) => it.document.uri.toString() === uri.toString());
+    if (!editor) return;
+
+    let selection: vscode.Selection | undefined = undefined;
+    let lineDelta = 0;
+    await editor.edit((builder) => {
+        for (const indel of edits) {
+            const parsed = parseSnippet(indel.newText);
+            if (parsed) {
+                const [newText, [placeholderStart, placeholderLength]] = parsed;
+                const prefix = newText.substr(0, placeholderStart);
+                const lastNewline = prefix.lastIndexOf('\n');
+
+                const startLine = indel.range.start.line + lineDelta + countLines(prefix);
+                const startColumn = lastNewline === -1 ?
+                    indel.range.start.character + placeholderStart
+                    : prefix.length - lastNewline - 1;
+                const endColumn = startColumn + placeholderLength;
+                selection = new vscode.Selection(
+                    new vscode.Position(startLine, startColumn),
+                    new vscode.Position(startLine, endColumn),
+                );
+                builder.replace(indel.range, newText);
+            } else {
+                lineDelta = countLines(indel.newText) - (indel.range.end.line - indel.range.start.line);
+                builder.replace(indel.range, indel.newText);
+            }
+        }
+    });
+    if (selection) editor.selection = selection;
+}
+
+function parseSnippet(snip: string): [string, [number, number]] | undefined {
+    const m = snip.match(/\$(0|\{0:([^}]*)\})/);
+    if (!m) return undefined;
+    const placeholder = m[2] ?? "";
+    const range: [number, number] = [m.index!!, placeholder.length];
+    const insert = snip.replace(m[0], placeholder);
+    return [insert, range];
+}
+
+function countLines(text: string): number {
+    return (text.match(/\n/g) || []).length;
+}
diff --git a/editors/code/src/commands/join_lines.ts b/editors/code/src/commands/join_lines.ts
index de0614653..0bf1ee6e6 100644
--- a/editors/code/src/commands/join_lines.ts
+++ b/editors/code/src/commands/join_lines.ts
@@ -1,7 +1,7 @@
 import * as ra from '../rust-analyzer-api';
+import * as lc from 'vscode-languageclient';
 
 import { Ctx, Cmd } from '../ctx';
-import { applySourceChange } from '../source_change';
 
 export function joinLines(ctx: Ctx): Cmd {
     return async () => {
@@ -9,10 +9,14 @@ export function joinLines(ctx: Ctx): Cmd {
         const client = ctx.client;
         if (!editor || !client) return;
 
-        const change = await client.sendRequest(ra.joinLines, {
-            range: client.code2ProtocolConverter.asRange(editor.selection),
+        const items: lc.TextEdit[] = await client.sendRequest(ra.joinLines, {
+            ranges: editor.selections.map((it) => client.code2ProtocolConverter.asRange(it)),
             textDocument: { uri: editor.document.uri.toString() },
         });
-        await applySourceChange(ctx, change);
+        editor.edit((builder) => {
+            client.protocol2CodeConverter.asTextEdits(items).forEach((edit) => {
+                builder.replace(edit.range, edit.newText);
+            });
+        });
     };
 }
diff --git a/editors/code/src/commands/on_enter.ts b/editors/code/src/commands/on_enter.ts
index 285849db7..a7871c31e 100644
--- a/editors/code/src/commands/on_enter.ts
+++ b/editors/code/src/commands/on_enter.ts
@@ -1,8 +1,8 @@
 import * as vscode from 'vscode';
 import * as ra from '../rust-analyzer-api';
 
-import { applySourceChange } from '../source_change';
 import { Cmd, Ctx } from '../ctx';
+import { applySnippetWorkspaceEdit } from '.';
 
 async function handleKeypress(ctx: Ctx) {
     const editor = ctx.activeRustEditor;
@@ -21,7 +21,8 @@ async function handleKeypress(ctx: Ctx) {
     });
     if (!change) return false;
 
-    await applySourceChange(ctx, change);
+    const workspaceEdit = client.protocol2CodeConverter.asWorkspaceEdit(change);
+    await applySnippetWorkspaceEdit(workspaceEdit);
     return true;
 }
 
diff --git a/editors/code/src/commands/ssr.ts b/editors/code/src/commands/ssr.ts
index 4ef8cdf04..5d40a64d2 100644
--- a/editors/code/src/commands/ssr.ts
+++ b/editors/code/src/commands/ssr.ts
@@ -2,7 +2,6 @@ import * as vscode from 'vscode';
 import * as ra from "../rust-analyzer-api";
 
 import { Ctx, Cmd } from '../ctx';
-import { applySourceChange } from '../source_change';
 
 export function ssr(ctx: Ctx): Cmd {
     return async () => {
@@ -22,11 +21,10 @@ export function ssr(ctx: Ctx): Cmd {
             }
         };
         const request = await vscode.window.showInputBox(options);
-
         if (!request) return;
 
-        const change = await client.sendRequest(ra.ssr, { query: request, parseOnly: false });
+        const edit = await client.sendRequest(ra.ssr, { query: request, parseOnly: false });
 
-        await applySourceChange(ctx, change);
+        await vscode.workspace.applyEdit(client.protocol2CodeConverter.asWorkspaceEdit(edit));
     };
 }