Fix panic when attempting to open directory

src/buffer.go

@@ -604,7 +604,7 @@ func GetOpenFileBuffer(filename string) *Buffer {
 	return nil
 }
 
-func CreateFileBuffer(filename string, openNonExistentFile bool) (*Buffer, error) {
+func CreateFileBuffer(filename string) (*Buffer, error) {
 	// Replace tilde with home directory
 	if filename != "~" && strings.HasPrefix(filename, "~/") {
 		homedir, err := os.UserHomeDir()
@@ -623,22 +623,20 @@ func CreateFileBuffer(filename string, openNonExistentFile bool) (*Buffer, error
 	}
 
 	stat, err := os.Stat(abs)
-	if !openNonExistentFile {
-		if err != nil {
+	if err != nil {
+		if !os.IsNotExist(err) {
 			return nil, err
 		}
-
-		if !stat.Mode().IsRegular() {
-			return nil, fmt.Errorf("%s is not a regular file", filename)
-		}
+	} else if !stat.Mode().IsRegular() {
+		return nil, fmt.Errorf("not a regular file")
 	}
 
 	if GetBufferByName(filename) != nil {
-		return nil, fmt.Errorf("a buffer with the name (%s) is already open", filename)
+		return nil, fmt.Errorf("a buffer with the same name is already open")
 	}
 
 	if GetBufferByFilename(abs) != nil {
-		return nil, fmt.Errorf("%s is already open in another buffer", filename)
+		return nil, fmt.Errorf("file is already open in another buffer")
 	}
 
 	buffer := Buffer{
@@ -675,7 +673,7 @@ func CreateBuffer(bufferName string) (*Buffer, error) {
 	}
 
 	if GetBufferByName(bufferName) != nil {
-		return nil, fmt.Errorf("a buffer with the name (%s) is already open", bufferName)
+		return nil, fmt.Errorf("a buffer with the same name is already open")
 	}
 
 	Buffers = append(Buffers, &buffer)

src/command.go

@@ -141,9 +141,9 @@ func initCommands() {
 					window.PrintMessage(fmt.Sprintf("File already open! Switching to buffer: %s", openBuffer.Name), TYPER_MESSAGE_INFO)
 					window.CurrentBuffer = openBuffer
 				} else {
-					newBuffer, err := CreateFileBuffer(input, false)
+					newBuffer, err := CreateFileBuffer(input)
 					if err != nil {
-						window.PrintMessage(fmt.Sprintf("Could not open file: %s", err.Error()), TYPER_MESSAGE_WARNING)
+						window.PrintMessage(fmt.Sprintf("Could not open file %s: %s", input, err), TYPER_MESSAGE_ERROR)
 						return
 					}
 

src/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"log"
 
 	flag "github.com/spf13/pflag"
@@ -45,9 +46,9 @@ func main() {
 	// Open paths passed as arguments
 	if flag.NArg() > 0 {
 		for _, file := range flag.Args() {
-			buffer, err := CreateFileBuffer(file, true)
+			buffer, err := CreateFileBuffer(file)
 			if err != nil {
-				window.PrintMessage("Could not open file: "+file, TYPER_MESSAGE_ERROR)
+				window.PrintMessage(fmt.Sprintf("Could not open file %s: %s", file, err), TYPER_MESSAGE_ERROR)
 				continue
 			}
 
@@ -55,7 +56,9 @@ func main() {
 				window.CurrentBuffer = buffer
 			}
 		}
-	} else {
+	}
+
+	if window.CurrentBuffer == nil {
 		buffer, err := CreateBuffer("New Buffer 1")
 		if err == nil {
 			window.CurrentBuffer = buffer