github.com/hasnat/dolt/go@v0.0.0-20210628190320-9eb5d843fbb7/store/util/status/status.go (about)

     1  // Copyright 2019 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  //
    15  // This file incorporates work covered by the following copyright and
    16  // permission notice:
    17  //
    18  // Copyright 2016 Attic Labs, Inc. All rights reserved.
    19  // Licensed under the Apache License, version 2.0:
    20  // http://www.apache.org/licenses/LICENSE-2.0
    21  
    22  // Package status prints status messages to a console, overwriting previous values.
    23  package status
    24  
    25  import (
    26  	"fmt"
    27  	"sync"
    28  	"time"
    29  )
    30  
    31  const (
    32  	clearLine = "\x1b[2K\r"
    33  	Rate      = 100 * time.Millisecond
    34  )
    35  
    36  var (
    37  	lastTime   time.Time
    38  	lastFormat string
    39  	lastArgs   []interface{}
    40  )
    41  
    42  var mu = &sync.Mutex{}
    43  
    44  func Clear() {
    45  	mu.Lock()
    46  	defer mu.Unlock()
    47  
    48  	fmt.Print(clearLine)
    49  	reset(time.Time{})
    50  }
    51  
    52  func WillPrint() bool {
    53  	mu.Lock()
    54  	defer mu.Unlock()
    55  
    56  	return time.Since(lastTime) >= Rate
    57  }
    58  
    59  func Printf(format string, args ...interface{}) {
    60  	mu.Lock()
    61  	defer mu.Unlock()
    62  
    63  	now := time.Now()
    64  	if now.Sub(lastTime) < Rate {
    65  		lastFormat, lastArgs = format, args
    66  	} else {
    67  		fmt.Printf(clearLine+format, args...)
    68  		reset(now)
    69  	}
    70  }
    71  
    72  func Done() {
    73  	mu.Lock()
    74  	defer mu.Unlock()
    75  
    76  	if lastArgs != nil {
    77  		fmt.Printf(clearLine+lastFormat, lastArgs...)
    78  	}
    79  	fmt.Println()
    80  	reset(time.Time{})
    81  }
    82  
    83  func reset(time time.Time) {
    84  	lastTime = time
    85  	lastFormat, lastArgs = "", nil
    86  }