Refactor for better modularity (share more code among edit functions, rename "offline" package to "backend"

src/backend/copyUNIXGeneric.go

@@ -0,0 +1,77 @@
+//go:build !windows && !darwin && !termux
+
+package backend
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+	"time"
+)
+
+// copyField copies a field from an entry to the clipboard
+func copyField(copySubject string, executableName string) {
+	var envSet bool // track whether environment variables are set
+	var cmd *exec.Cmd
+	// determine whether to use wl-copy (Wayland) or xclip (X11)
+	if _, envSet = os.LookupEnv("WAYLAND_DISPLAY"); envSet {
+		cmd = exec.Command("wl-copy")
+	} else if _, envSet = os.LookupEnv("DISPLAY"); envSet {
+		cmd = exec.Command("xclip", "-sel", "c")
+	} else {
+		fmt.Println(AnsiError + "Clipboard platform could not be determined - note that the clipboard does not function in a raw TTY" + AnsiReset)
+		os.Exit(1)
+	}
+
+	writeToStdin(cmd, copySubject)
+	err := cmd.Run()
+	if err != nil {
+		fmt.Println(AnsiError + "Failed to copy to clipboard: " + err.Error() + AnsiReset)
+		os.Exit(1)
+	}
+
+	// launch clipboard clearing process if executableName is provided
+	if executableName != "" {
+		cmd = exec.Command(executableName, "clipclear")
+		writeToStdin(cmd, copySubject)
+		err = cmd.Start()
+		if err != nil {
+			fmt.Println(AnsiError + "Failed to launch automated clipboard clearing process - does this libmutton implementation support the \"clipclear\" argument?" + AnsiReset)
+			os.Exit(1)
+		}
+		os.Exit(0) // only exit if clipboard clearing process is launched, otherwise assume continuous clipboard refresh
+	}
+}
+
+// clipClear is called in a separate process to clear the clipboard after 30 seconds
+func clipClear(oldContents string) {
+	time.Sleep(30 * time.Second)
+
+	var envSet bool   // track whether environment variables are set
+	var platform bool // track clipboard platform, false for Wayland, true for X11
+	var cmd *exec.Cmd
+	// determine whether to use wl-copy (Wayland) or xclip (X11)
+	if _, envSet = os.LookupEnv("WAYLAND_DISPLAY"); envSet {
+		cmd = exec.Command("wl-paste")
+	} else if _, envSet = os.LookupEnv("DISPLAY"); envSet {
+		cmd = exec.Command("xclip", "-o", "-sel", "c")
+		platform = true
+	}
+	newContents, _ := cmd.Output()
+
+	if oldContents == strings.TrimRight(string(newContents), "\r\n") {
+		switch platform {
+		case false:
+			cmd = exec.Command("wl-copy", "-c")
+		case true:
+			cmd = exec.Command("xclip", "-i", "/dev/null", "-sel", "c")
+		}
+		err := cmd.Run()
+		if err != nil {
+			fmt.Println(AnsiError + "Failed to clear clipboard: " + err.Error() + AnsiReset)
+			os.Exit(1)
+		}
+	}
+	os.Exit(0)
+}