Support passing files ot send through command line arguments

Intended for getting #91 working, at least on Linux and BSD, in the future.

Fixes #75

internal/transport/bridge/bridge.go

@@ -13,11 +13,11 @@ import (
 func newCodeDisplay(window fyne.Window) *fyne.Container {
 	codeLabel := &widget.Label{Text: "Waiting for code..."}
 	copyButton := &widget.Button{Icon: theme.ContentCopyIcon(), Importance: widget.LowImportance}
-	clipboard := window.Clipboard()
+
 	copyButton.OnTapped = func() {
 		if codeLabel.Text != "Waiting for code..." {
 			copyButton.SetIcon(theme.ConfirmIcon())
-			clipboard.SetContent(codeLabel.Text)
+			window.Clipboard().SetContent(codeLabel.Text)
 		} else {
 			copyButton.SetIcon(theme.CancelIcon())
 		}

internal/ui/send.go

@@ -75,7 +75,7 @@ func (s *send) onCustomCode(enabled bool) {
 	s.client.CustomCode = enabled
 }
 
-func (s *send) onDropped(_ fyne.Position, uris []fyne.URI) {
+func (s *send) newTransfer(uris []fyne.URI) {
 	if len(uris) == 0 {
 		return
 	}

internal/ui/tabs.go

@@ -2,9 +2,13 @@
 package ui
 
 import (
+	"os"
+	"path/filepath"
+
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/container"
 	"fyne.io/fyne/v2/driver/desktop"
+	"fyne.io/fyne/v2/storage"
 	"github.com/Jacalz/rymdport/v3/internal/transport"
 )
 
@@ -22,14 +26,29 @@ func Create(app fyne.App, window fyne.Window) *container.AppTabs {
 		},
 	}
 
-	window.SetOnDropped(func(pos fyne.Position, uris []fyne.URI) {
+	window.SetOnDropped(func(_ fyne.Position, uris []fyne.URI) {
 		if tabs.SelectedIndex() != 0 {
 			tabs.SelectIndex(0)
 		}
 
-		send.onDropped(pos, uris)
+		send.newTransfer(uris)
 	})
 
+	if args := os.Args[1:]; len(args) > 0 {
+		uris := make([]fyne.URI, 0, len(args))
+		for _, path := range args {
+			path, err := filepath.Abs(path)
+			if err != nil {
+				fyne.LogError("Failed to create absolute path", err)
+				continue
+			}
+
+			uris = append(uris, storage.NewFileURI(path))
+		}
+
+		send.newTransfer(uris)
+	}
+
 	canvas := window.Canvas()
 
 	// Set up support for switching between the tabs.