forked from apache/mynewt-newtmgr
/
usage.go
79 lines (66 loc) · 1.79 KB
/
usage.go
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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package cli
import (
"fmt"
"os"
"sync/atomic"
log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"mynewt.apache.org/newt/util"
)
var onExit func()
var exiting int32
var silenceErrors bool
func SetOnExit(cb func()) {
onExit = cb
}
func SilenceErrors() {
silenceErrors = true
}
// Performs some cleanup and terminates the application.
func NmExit(status int) {
// If we are already exiting, just block forever. We don't want to perform
// a second round of cleanup or quit before the current one completes.
if !atomic.CompareAndSwapInt32(&exiting, 0, 1) {
select {}
}
if onExit != nil {
onExit()
}
os.Exit(status)
}
func nmUsage(cmd *cobra.Command, err error) {
if !silenceErrors {
if err != nil {
sErr, ok := err.(*util.NewtError)
if !ok {
sErr = util.ChildNewtError(err)
}
log.Debugf("%s", sErr.StackTrace)
fmt.Fprintf(os.Stderr, "Error: %s\n", sErr.Text)
}
if cmd != nil {
fmt.Printf("\n")
fmt.Printf("%s - ", cmd.Name())
cmd.Help()
}
}
NmExit(1)
}