Removed unnecessary file types in go to definition and returned error on unknown file type

Author: iexavl

ls/ls.go

@@ -88,10 +88,8 @@ type Config struct {
 }
 
 var extToFileType = map[string]string{
-	".ino": "arduino",
-	".cpp": "cpp",
 	".h":   "cpp",
-	".c":   "c",
+	".hpp": "cpp",
 }
 
 var yellow = color.New(color.FgHiYellow)
@@ -1639,6 +1637,16 @@ type UnknownURIError struct {
 	URI lsp.DocumentURI
 }
 
+// UnknownFileExtensionError when a file extension isn't recognized
+// and a file with it has to be opened.
+type UnknownFileExtensionError struct {
+	extension string
+}
+
 func (e *UnknownURIError) Error() string {
 	return "Document is not available: " + e.URI.String()
 }
+
+func (e *UnknownFileExtensionError) Error() string {
+	return "Unknown file extension " + e.extension
+}

ls/ls_ide_to_clang.go

@@ -25,8 +25,7 @@ import (
 	"go.bug.st/lsp/jsonrpc"
 )
 
-func getFileType(filename string) string {
-	ext := filepath.Ext(filename)
+func getFileType(ext string) string {
 	if fileType, ok := extToFileType[ext]; ok {
 		return fileType
 	}
@@ -37,11 +36,12 @@ func (ls *INOLanguageServer) idePathToIdeURI(logger jsonrpc.FunctionLogger, inoP
 }
 
 func makeTextDocumentItem(logger jsonrpc.FunctionLogger, path string) (lsp.TextDocumentItem, bool, error) {
+	ext := filepath.Ext(path)
 	filetype := getFileType(path)
+	uri := lsp.NewDocumentURI(path)
 	if filetype == "unknown" {
-		return lsp.TextDocumentItem{}, false, nil
+		return lsp.TextDocumentItem{URI: uri, LanguageID: filetype}, false, &UnknownFileExtensionError{ext}
 	}
-	uri := lsp.NewDocumentURI(path)
 	languageId := filetype
 	version := 0