Seperate plat code of dialog into different files

dialog/file_darwin.go

@@ -0,0 +1,19 @@
+package dialog
+
+import (
+	"os"
+	"path/filepath"
+)
+
+func getFavoriteLocations() (map[string]string, error) {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return nil, err
+	}
+
+	return map[string]string{
+		"Home":      homeDir,
+		"Documents": filepath.Join(homeDir, "Documents"),
+		"Downloads": filepath.Join(homeDir, "Downloads"),
+	}, nil
+}

dialog/file_linux.go

@@ -0,0 +1,65 @@
+package dialog
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+)
+
+func getFavoriteLocationLinux(homeDir, name string) (string, error) {
+	cmdName := "xdg-user-dir"
+	fallback := filepath.Join(homeDir, name)
+
+	if _, err := exec.LookPath(cmdName); err != nil {
+		return fallback, fmt.Errorf("%s not found in PATH. using fallback paths", cmdName)
+	}
+
+	cmd := exec.Command(cmdName, name)
+	stdout := bytes.NewBufferString("")
+
+	cmd.Stdout = stdout
+	err := cmd.Run()
+	if err != nil {
+		return fallback, err
+	}
+
+	loc := stdout.String()
+	// Remove \n at the end
+	loc = loc[:len(loc)-1]
+
+	if loc == homeDir {
+		return fallback, fmt.Errorf("this computer does not have a %s folder", name)
+	}
+
+	return stdout.String(), nil
+}
+
+func getFavoriteLocations() (map[string]string, error) {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return nil, err
+	}
+
+	rv := map[string]string{
+		"Home": homeDir,
+	}
+	var err error
+	documentsDir, err1 := getFavoriteLocationLinux(homeDir, "DOCUMENTS")
+	if err == nil {
+		rv["Documents"] = documentsDir
+	} else {
+		rv["Documents"] = filepath.Join(homeDir, "Documents")
+		err = err1
+	}
+	downloadsDir, err1 := getFavoriteLocationLinux(homeDir, "DOWNLOADS")
+	if err == nil {
+		rv["Downloads"] = downloadsDir
+	} else {
+		rv["Downloads"] = filepath.Join(homeDir, "Downloads")
+		err = err1
+	}
+
+	return rv, err
+}

dialog/file_unix.go

@@ -0,0 +1,26 @@
+// +build !windows,!android,!ios
+
+package dialog
+
+import (
+	"fyne.io/fyne"
+	"fyne.io/fyne/theme"
+)
+
+func (f *fileDialog) loadPlaces() []fyne.CanvasObject {
+	return []fyne.CanvasObject{makeFavoriteButton("Computer", theme.ComputerIcon(), func() {
+		f.setDirectory("/")
+	})}
+}
+
+func isHidden(file, _ string) bool {
+	return len(file) == 0 || file[0] == '.'
+}
+
+func fileOpenOSOverride(*FileDialog) bool {
+	return false
+}
+
+func fileSaveOSOverride(*FileDialog) bool {
+	return false
+}