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|
package progress
import (
"strings"
"time"
"github.com/jedib0t/go-pretty/v6/text"
)
// IndeterminateIndicator defines the structure for the indicator to indicate
// indeterminate progress. Ex.: {0, <=>}
type IndeterminateIndicator struct {
Position int
Text string
}
// IndeterminateIndicatorGenerator is a function that takes the maximum length
// of the progress bar and returns an IndeterminateIndicator telling the
// indicator string, and the location of the same in the progress bar.
//
// Technically, this could generate and return the entire progress bar string to
// override the full display of the same - this is done by the Dominoes and
// Pac-Man examples below.
type IndeterminateIndicatorGenerator func(maxLen int) IndeterminateIndicator
// IndeterminateIndicatorDominoes simulates a bunch of dominoes falling back and
// forth.
func IndeterminateIndicatorDominoes(duration time.Duration) IndeterminateIndicatorGenerator {
return timedIndeterminateIndicatorGenerator(indeterminateIndicatorDominoes(), duration)
}
// IndeterminateIndicatorMovingBackAndForth incrementally moves from the left to
// right and back for each specified duration. If duration is 0, then every
// single invocation moves the indicator.
func IndeterminateIndicatorMovingBackAndForth(indicator string, duration time.Duration) IndeterminateIndicatorGenerator {
return timedIndeterminateIndicatorGenerator(indeterminateIndicatorMovingBackAndForth(indicator), duration)
}
// IndeterminateIndicatorMovingLeftToRight incrementally moves from the left to
// right and starts from left again for each specified duration. If duration is
// 0, then every single invocation moves the indicator.
func IndeterminateIndicatorMovingLeftToRight(indicator string, duration time.Duration) IndeterminateIndicatorGenerator {
return timedIndeterminateIndicatorGenerator(indeterminateIndicatorMovingLeftToRight(indicator), duration)
}
// IndeterminateIndicatorMovingRightToLeft incrementally moves from the right to
// left and starts from right again for each specified duration. If duration is
// 0, then every single invocation moves the indicator.
func IndeterminateIndicatorMovingRightToLeft(indicator string, duration time.Duration) IndeterminateIndicatorGenerator {
return timedIndeterminateIndicatorGenerator(indeterminateIndicatorMovingRightToLeft(indicator), duration)
}
// IndeterminateIndicatorPacMan simulates a Pac-Man character chomping through
// the progress bar back and forth.
func IndeterminateIndicatorPacMan(duration time.Duration) IndeterminateIndicatorGenerator {
return timedIndeterminateIndicatorGenerator(indeterminateIndicatorPacMan(), duration)
}
func indeterminateIndicatorDominoes() IndeterminateIndicatorGenerator {
direction := 1 // positive == left to right; negative == right to left
nextPosition := 0
out := strings.Builder{}
generateIndicator := func(currentPosition int, maxLen int) string {
out.Reset()
out.WriteString(strings.Repeat("/", currentPosition))
out.WriteString(strings.Repeat("\\", maxLen-currentPosition))
return out.String()
}
return func(maxLen int) IndeterminateIndicator {
currentPosition := nextPosition
if currentPosition == 0 {
direction = 1
} else if currentPosition == maxLen {
direction = -1
}
nextPosition += direction
return IndeterminateIndicator{
Position: 0,
Text: generateIndicator(currentPosition, maxLen),
}
}
}
func indeterminateIndicatorMovingBackAndForth(indicator string) IndeterminateIndicatorGenerator {
direction := 1 // positive == left to right; negative == right to left
nextPosition := 0
return func(maxLen int) IndeterminateIndicator {
currentPosition := nextPosition
if currentPosition == 0 {
direction = 1
} else if currentPosition+text.RuneWidthWithoutEscSequences(indicator) == maxLen {
direction = -1
}
nextPosition += direction
return IndeterminateIndicator{
Position: currentPosition,
Text: indicator,
}
}
}
func indeterminateIndicatorMovingLeftToRight(indicator string) IndeterminateIndicatorGenerator {
nextPosition := 0
return func(maxLen int) IndeterminateIndicator {
currentPosition := nextPosition
nextPosition++
if nextPosition+text.RuneWidthWithoutEscSequences(indicator) > maxLen {
nextPosition = 0
}
return IndeterminateIndicator{
Position: currentPosition,
Text: indicator,
}
}
}
func indeterminateIndicatorMovingRightToLeft(indicator string) IndeterminateIndicatorGenerator {
nextPosition := -1
return func(maxLen int) IndeterminateIndicator {
if nextPosition == -1 {
nextPosition = maxLen - text.RuneWidthWithoutEscSequences(indicator)
}
currentPosition := nextPosition
nextPosition--
return IndeterminateIndicator{
Position: currentPosition,
Text: indicator,
}
}
}
func indeterminateIndicatorPacMan() IndeterminateIndicatorGenerator {
pacManMovingRight, pacManMovingLeft := "ᗧ", "ᗤ"
direction := 1 // positive == left to right; negative == right to left
indicator := pacManMovingRight
nextPosition := 0
out := strings.Builder{}
generateIndicator := func(currentPosition int, maxLen int) string {
out.Reset()
if currentPosition > 0 {
out.WriteString(strings.Repeat(" ", currentPosition))
}
out.WriteString(indicator)
out.WriteString(strings.Repeat(" ", maxLen-currentPosition-1))
return out.String()
}
return func(maxLen int) IndeterminateIndicator {
currentPosition := nextPosition
currentText := generateIndicator(currentPosition, maxLen)
if currentPosition == 0 {
direction = 1
indicator = pacManMovingRight
} else if currentPosition+text.RuneWidthWithoutEscSequences(indicator) == maxLen {
direction = -1
indicator = pacManMovingLeft
}
nextPosition += direction
return IndeterminateIndicator{
Position: 0,
Text: currentText,
}
}
}
// timedIndeterminateIndicatorGenerator ticks based on the given duration. If
// duration is 0, it ticks for every invocation.
func timedIndeterminateIndicatorGenerator(indicatorGenerator IndeterminateIndicatorGenerator, duration time.Duration) IndeterminateIndicatorGenerator {
var indeterminateIndicator *IndeterminateIndicator
lastRenderTime := time.Now()
return func(maxLen int) IndeterminateIndicator {
currRenderTime := time.Now()
if indeterminateIndicator == nil || duration == 0 || currRenderTime.Sub(lastRenderTime) > duration {
tmpIndeterminateIndicator := indicatorGenerator(maxLen)
indeterminateIndicator = &tmpIndeterminateIndicator
lastRenderTime = currRenderTime
}
return *indeterminateIndicator
}
}
|
