cmd/govim: implement LSP DidSave (#618)

Closes #287
govim · Dec 10, 2019 · d1c7a12 · d1c7a12
1 parent 8f8ccc4
commit d1c7a12
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diff --git a/cmd/govim/buffer_events.go b/cmd/govim/buffer_events.go
@@ -187,6 +187,25 @@ func (v *vimstate) deleteCurrentBuffer(args ...json.RawMessage) error {
 	return nil
 }
 
+func (v *vimstate) bufWritePost(args ...json.RawMessage) error {
+	currBufNr := v.ParseInt(args[0])
+	cb, ok := v.buffers[currBufNr]
+	if !ok {
+		return fmt.Errorf("tried to handle BufWritePost for buffer %v; but we have no record of it", currBufNr)
+	}
+	params := &protocol.DidSaveTextDocumentParams{
+		TextDocument: protocol.VersionedTextDocumentIdentifier{
+			TextDocumentIdentifier: cb.ToTextDocumentIdentifier(),
+			Version:                float64(cb.Version),
+		},
+		Text: string(cb.Contents()),
+	}
+	if err := v.server.DidSave(context.Background(), params); err != nil {
+		return fmt.Errorf("failed to call gopls.DidSave on %v: %v", cb.Name, err)
+	}
+	return nil
+}
+
 type bufferUpdate struct {
 	buffer   *types.Buffer
 	wait     chan bool

diff --git a/cmd/govim/main.go b/cmd/govim/main.go
@@ -250,6 +250,7 @@ func (g *govimplugin) Init(gg govim.Govim, errCh chan error) error {
 	g.DefineAutoCommand("", govim.Events{govim.EventBufUnload}, govim.Patterns{"*.go"}, false, g.vimstate.bufUnload, "eval(expand('<abuf>'))")
 	g.DefineAutoCommand("", govim.Events{govim.EventBufRead, govim.EventBufNewFile}, govim.Patterns{"*.go"}, false, g.vimstate.bufReadPost, exprAutocmdCurrBufInfo)
 	g.DefineAutoCommand("", govim.Events{govim.EventBufWritePre}, govim.Patterns{"*.go"}, false, g.vimstate.formatCurrentBuffer, "eval(expand('<abuf>'))")
+	g.DefineAutoCommand("", govim.Events{govim.EventBufWritePost}, govim.Patterns{"*.go"}, false, g.vimstate.bufWritePost, "eval(expand('<abuf>'))")
 	g.DefineFunction(string(config.FunctionComplete), []string{"findarg", "base"}, g.vimstate.complete)
 	g.DefineCommand(string(config.CommandGoToDef), g.vimstate.gotoDef, govim.NArgsZeroOrOne)
 	g.DefineCommand(string(config.CommandSuggestedFixes), g.vimstate.suggestFixes, govim.NArgsZeroOrOne)