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Subcommands flag parsing errors print subcommand usage and not root's command usage
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parent
b825817fc0
commit
5ed62f352a
1 changed files with 20 additions and 1 deletions
19
command.go
19
command.go
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@ -57,6 +57,7 @@ type Command struct {
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commandsMaxCommandPathLen int
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flagErrorBuf *bytes.Buffer
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cmdErrorBuf *bytes.Buffer
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args []string
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output *io.Writer // nil means stderr; use Out() method instead
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@ -355,6 +356,17 @@ func (c *Command) execute(a []string) (err error) {
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err = c.ParseFlags(a)
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if err != nil {
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// We're writing subcommand usage to root command's error buffer to have it displayed to the user
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r := c.Root()
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if r.cmdErrorBuf == nil {
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r.cmdErrorBuf = new(bytes.Buffer)
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}
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// for writing the usage to the buffer we need to switch the output temporarily
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// since Out() returns root output, you also need to revert that on root
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out := r.Out()
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r.SetOutput(r.cmdErrorBuf)
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c.Usage()
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r.SetOutput(out)
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return err
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} else {
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// If help is called, regardless of other flags, we print that
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@ -430,7 +442,12 @@ func (c *Command) Execute() (err error) {
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// Flags parsing had an error.
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// If an error happens here, we have to report it to the user
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c.Println(c.errorMsgFromParse())
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// If an error happens search also for subcommand info about that
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if c.cmdErrorBuf != nil && c.cmdErrorBuf.Len() > 0 {
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c.Println(c.cmdErrorBuf.String())
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} else {
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c.Usage()
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}
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return e
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} else {
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// If help is called, regardless of other flags, we print that
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@ -484,6 +501,8 @@ func (c *Command) initHelp() {
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func (c *Command) ResetCommands() {
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c.commands = nil
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c.helpCommand = nil
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c.cmdErrorBuf = new(bytes.Buffer)
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c.cmdErrorBuf.Reset()
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}
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func (c *Command) Commands() []*Command {
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