diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/flag/flag.go | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/flag/flag.go b/src/flag/flag.go index 6bc8e96e20..36e0550030 100644 --- a/src/flag/flag.go +++ b/src/flag/flag.go @@ -269,7 +269,9 @@ const ( type FlagSet struct { // Usage is the function called when an error occurs while parsing flags. // The field is a function (not a method) that may be changed to point to - // a custom error handler. + // a custom error handler. What happens after Usage is called depends + // on the ErrorHandling setting; for the command line, this defaults + // to ExitOnError, which exits the program after calling Usage. Usage func() name string @@ -521,6 +523,9 @@ func (f *FlagSet) defaultUsage() { // The function is a variable that may be changed to point to a custom function. // By default it prints a simple header and calls PrintDefaults; for details about the // format of the output and how to control it, see the documentation for PrintDefaults. +// Custom usage functions may choose to exit the program; by default exiting +// happens anyway as the command line's error handling strategy is set to +// ExitOnError. var Usage = func() { fmt.Fprintf(CommandLine.out(), "Usage of %s:\n", os.Args[0]) PrintDefaults() |