Replace most occurrences of os.Exit(0) in the backend and sync packages with a custom backend.Exit function that can allow "soft exit" in GUI/TUI environments to avoid killing the entire process; currently all major errors still result in killing the entire process

src/backend/configParser.go

@@ -35,7 +35,7 @@ func ParseConfig(readKeys []string, missingValueError string) []string {
 			case "":
 				fmt.Println(AnsiError + "Failed to find value for key \"" + key + "\" in section \"[LIBMUTTON]\" in libmutton.ini" + AnsiReset)
 			case "0":
-				os.Exit(0)
+				Exit(0)
 			default:
 				fmt.Println(AnsiError + missingValueError + AnsiReset)
 			}

src/backend/copy.go

@@ -64,7 +64,7 @@ func ClipClearArgument() {
 		oldContents := clipScanner.Text()
 		clipClear(oldContents)
 	} else {
-		os.Exit(0)
+		os.Exit(0) // use os.Exit instead of backend.Exit, as this function runs out of a background subprocess that is invisible to the user (will never appear in GUI/TUI environment)
 	}
 }
 

src/backend/copyDARWIN.go

@@ -31,7 +31,7 @@ func copyField(executableName, copySubject string) {
 			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
+		Exit(0) // only exit if clipboard clearing process is launched, otherwise assume continuous clipboard refresh
 	}
 }
 
@@ -55,5 +55,5 @@ func clipClear(oldContents string) {
 			os.Exit(1)
 		}
 	}
-	os.Exit(0)
+	os.Exit(0) // use os.Exit instead of backend.Exit, as this function runs out of a background subprocess that is invisible to the user (will never appear in GUI/TUI environment)
 }

src/backend/copyTERMUX.go

@@ -29,7 +29,7 @@ func copyField(executableName, copySubject string) {
 			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
+		Exit(0) // only exit if clipboard clearing process is launched, otherwise assume continuous clipboard refresh
 	}
 }
 
@@ -53,5 +53,5 @@ func clipClear(oldContents string) {
 			os.Exit(1)
 		}
 	}
-	os.Exit(0)
+	os.Exit(0) // use os.Exit instead of backend.Exit, as this function runs out of a background subprocess that is invisible to the user (will never appear in GUI/TUI environment)
 }

src/backend/copyUNIXGeneric.go

@@ -40,7 +40,7 @@ func copyField(executableName, copySubject string) {
 			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
+		Exit(0) // only exit if clipboard clearing process is launched, otherwise assume continuous clipboard refresh
 	}
 }
 
@@ -77,5 +77,5 @@ func clipClear(oldContents string) {
 			os.Exit(1)
 		}
 	}
-	os.Exit(0)
+	os.Exit(0) // use os.Exit instead of backend.Exit, as this function runs out of a background subprocess that is invisible to the user (will never appear in GUI/TUI environment)
 }

src/backend/copyWIN.go

@@ -28,7 +28,7 @@ func copyField(executableName, copySubject string) {
 			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
+		Exit(0) // only exit if clipboard clearing process is launched, otherwise assume continuous clipboard refresh
 	}
 }
 
@@ -51,5 +51,5 @@ func clipClear(oldContents string) {
 			os.Exit(1)
 		}
 	}
-	os.Exit(0)
+	os.Exit(0) // use os.Exit instead of backend.Exit, as this function runs out of a background subprocess that is invisible to the user (will never appear in GUI/TUI environment)
 }

src/backend/edit.go

@@ -37,7 +37,7 @@ func Rename(oldLocation, newLocation string) {
 	}
 
 	// TODO implement synced renaming
-	os.Exit(0)
+	Exit(0)
 }
 
 // EnsureSliceLength ensures slice is long enough to contain the specified index

src/backend/exitHard.go

@@ -0,0 +1,9 @@
+//go:build !returnOnExit
+
+package backend
+
+import "os"
+
+func Exit(code int) {
+	os.Exit(code)
+}

src/backend/exitSoft.go

@@ -0,0 +1,7 @@
+//go:build returnOnExit
+
+package backend
+
+func Exit(code int) {
+	return code
+}