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Set a different stream for deprecation errors.

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Signed-off-by: Daniel Nephin <dnephin@gmail.com>
This commit is contained in:
Daniel Nephin 2016-06-23 13:57:39 -04:00
parent 6a8bd97bdb
commit 60b5e87117
1 changed files with 25 additions and 9 deletions
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18
command.go
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@ -111,6 +111,7 @@ type Command struct {
args []string // actual args parsed from flags args []string // actual args parsed from flags
output *io.Writer // nil means stderr; use Out() method instead output *io.Writer // nil means stderr; use Out() method instead
deprecatedWriter *io.Writer // Stream for writing deprecation messages
usageFunc func(*Command) error // Usage can be defined by application usageFunc func(*Command) error // Usage can be defined by application
usageTemplate string // Can be defined by Application usageTemplate string // Can be defined by Application
helpTemplate string // Can be defined by Application helpTemplate string // Can be defined by Application
@ -159,6 +160,11 @@ func (c *Command) SetOutput(output io.Writer) {
c.output = &output c.output = &output
} }
// SetDeprecatedWriter sets a writer to use for deprecation messages.
func (c *Command) SetDeprecatedWriter(output io.Writer) {
c.deprecatedWriter = &output
}
// Usage can be defined by application // Usage can be defined by application
func (c *Command) SetUsageFunc(f func(*Command) error) { func (c *Command) SetUsageFunc(f func(*Command) error) {
c.usageFunc = f c.usageFunc = f
@ -517,7 +523,7 @@ func (c *Command) execute(a []string) (err error) {
} }
if len(c.Deprecated) > 0 { if len(c.Deprecated) > 0 {
c.Printf("Command %q is deprecated, %s\n", c.Name(), c.Deprecated) c.printDeprecated()
} }
// initialize help flag as the last point possible to allow for user // initialize help flag as the last point possible to allow for user
@ -821,6 +827,16 @@ func (c *Command) Printf(format string, i ...interface{}) {
c.Print(str) c.Print(str)
} }
func (c *Command) printDeprecated() {
var out io.Writer
if c.deprecatedWriter != nil {
out = *c.deprecatedWriter
} else {
out = c.Out()
}
fmt.Fprintf(out, "Command %q is deprecated, %s\n", c.Name(), c.Deprecated)
}
// Output the usage for the command // Output the usage for the command
// Used when a user provides invalid input // Used when a user provides invalid input
// Can be defined by user by overriding UsageFunc // Can be defined by user by overriding UsageFunc