Implement the 'textDocument/rename' command

langserver/handler.go

@@ -446,6 +446,15 @@ func (h *LangHandler) Handle(ctx context.Context, conn jsonrpc2.JSONRPC2, req *j
 		}
 		return h.handleWorkspaceReferences(ctx, conn, req, params)
 
+	case "textDocument/rename":
+		if req.Params == nil {
+			return nil, &jsonrpc2.Error{Code: jsonrpc2.CodeInvalidParams}
+		}
+		var params lsp.RenameParams
+		if err := json.Unmarshal(*req.Params, &params); err != nil {
+			return nil, err
+		}
+		return h.handleRename(ctx, conn, req, params)
 	default:
 		if isFileSystemRequest(req.Method) {
 			uri, fileChanged, err := h.handleFileSystemRequest(ctx, req)

langserver/langserver_test.go

@@ -1181,6 +1181,35 @@ func main() {
 			},
 		},
 	},
+	"renaming": {
+		rootURI: "file:///src/test/pkg",
+		fs: map[string]string{
+			"a.go": `package p
+import "fmt"
+
+func main() {
+    str := A()
+    fmt.Println(str)
+}
+
+func A() string {
+	return "test"
+}
+`,
+		},
+		cases: lspTestCases{
+			wantRenames: map[string]map[string]string{
+				"a.go:5:5": map[string]string{
+					"4:4-4:7":   "/src/test/pkg/a.go",
+					"5:16-5:19": "/src/test/pkg/a.go",
+				},
+				"a.go:9:6": map[string]string{
+					"4:11-4:12": "/src/test/pkg/a.go",
+					"8:5-8:6":   "/src/test/pkg/a.go",
+				},
+			},
+		},
+	},
 }
 
 func TestServer(t *testing.T) {
@@ -1314,6 +1343,7 @@ type lspTestCases struct {
 	wantSignatures                          map[string]string
 	wantWorkspaceReferences                 map[*lspext.WorkspaceReferencesParams][]string
 	wantFormatting                          map[string]map[string]string
+	wantRenames                             map[string]map[string]string
 }
 
 func copyFileToOS(ctx context.Context, fs *AtomicFS, targetFile, srcFile string) error {
@@ -1495,6 +1525,12 @@ func lspTests(t testing.TB, ctx context.Context, h *LangHandler, c *jsonrpc2.Con
 			formattingTest(t, ctx, c, rootURI, file, want)
 		})
 	}
+
+	for pos, want := range cases.wantRenames {
+		tbRun(t, fmt.Sprintf("renaming-%s", strings.Replace(pos, "/", "-", -1)), func(t testing.TB) {
+			renamingTest(t, ctx, c, rootURI, pos, want)
+		})
+	}
 }
 
 // tbRun calls (testing.T).Run or (testing.B).Run.
@@ -1716,6 +1752,29 @@ func formattingTest(t testing.TB, ctx context.Context, c *jsonrpc2.Conn, rootURI
 	}
 }
 
+func renamingTest(t testing.TB, ctx context.Context, c *jsonrpc2.Conn, rootURI lsp.DocumentURI, pos string, want map[string]string) {
+	file, line, char, err := parsePos(pos)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	workspaceEdit, err := callRenaming(ctx, c, uriJoin(rootURI, file), line, char, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	got := map[string]string{}
+	for file, edits := range workspaceEdit.Changes {
+		for _, edit := range edits {
+			got[edit.Range.String()] = util.UriToPath(lsp.DocumentURI(file))
+		}
+	}
+
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("got %v, want: %v", got, want)
+	}
+}
+
 func parsePos(s string) (file string, line, char int, err error) {
 	parts := strings.Split(s, ":")
 	if len(parts) != 3 {
@@ -1970,6 +2029,16 @@ func callFormatting(ctx context.Context, c *jsonrpc2.Conn, uri lsp.DocumentURI)
 	return edits, err
 }
 
+func callRenaming(ctx context.Context, c *jsonrpc2.Conn, uri lsp.DocumentURI, line, char int, newName string) (lsp.WorkspaceEdit, error) {
+	var edit lsp.WorkspaceEdit
+	err := c.Call(ctx, "textDocument/rename", lsp.RenameParams{
+		TextDocument: lsp.TextDocumentIdentifier{URI: uri},
+		Position:     lsp.Position{Line: line, Character: char},
+		NewName:      newName,
+	}, &edit)
+	return edit, err
+}
+
 type markedStrings []lsp.MarkedString
 
 func (v *markedStrings) UnmarshalJSON(data []byte) error {

langserver/rename.go

@@ -0,0 +1,45 @@
+package langserver
+
+import (
+	"context"
+
+	lsp "github.com/sourcegraph/go-lsp"
+	"github.com/sourcegraph/jsonrpc2"
+)
+
+func (h *LangHandler) handleRename(ctx context.Context, conn jsonrpc2.JSONRPC2,
+	req *jsonrpc2.Request, params lsp.RenameParams) (lsp.WorkspaceEdit, error) {
+	rp := lsp.ReferenceParams{
+		TextDocumentPositionParams: lsp.TextDocumentPositionParams{
+			TextDocument: params.TextDocument,
+			Position:     params.Position,
+		},
+		Context: lsp.ReferenceContext{
+			IncludeDeclaration: true,
+			XLimit:             0,
+		},
+	}
+
+	references, err := h.handleTextDocumentReferences(ctx, conn, req, rp)
+	if err != nil {
+		return lsp.WorkspaceEdit{}, err
+	}
+
+	result := lsp.WorkspaceEdit{}
+	if result.Changes == nil {
+		result.Changes = make(map[string][]lsp.TextEdit)
+	}
+	for _, ref := range references {
+		edit := lsp.TextEdit{
+			Range:   ref.Range,
+			NewText: params.NewName,
+		}
+		edits := result.Changes[string(ref.URI)]
+		if edits == nil {
+			edits = []lsp.TextEdit{}
+		}
+		edits = append(edits, edit)
+		result.Changes[string(ref.URI)] = edits
+	}
+	return result, nil
+}