125 lines
2.2 KiB
Go
125 lines
2.2 KiB
Go
package util
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import (
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"math"
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"os"
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"time"
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"github.com/mattn/go-isatty"
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"github.com/mattn/go-runewidth"
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)
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var _runeWidths = make(map[rune]int)
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// RuneWidth returns rune width
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func RuneWidth(r rune, prefixWidth int, tabstop int) int {
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if r == '\t' {
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return tabstop - prefixWidth%tabstop
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} else if w, found := _runeWidths[r]; found {
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return w
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} else if r == '\n' || r == '\r' {
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return 1
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}
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w := runewidth.RuneWidth(r)
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_runeWidths[r] = w
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return w
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}
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// Max returns the largest integer
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func Max(first int, second int) int {
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if first >= second {
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return first
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}
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return second
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}
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// Max16 returns the largest integer
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func Max16(first int16, second int16) int16 {
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if first >= second {
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return first
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}
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return second
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}
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// Max32 returns the largest 32-bit integer
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func Max32(first int32, second int32) int32 {
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if first > second {
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return first
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}
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return second
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}
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// Min returns the smallest integer
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func Min(first int, second int) int {
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if first <= second {
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return first
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}
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return second
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}
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// Min32 returns the smallest 32-bit integer
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func Min32(first int32, second int32) int32 {
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if first <= second {
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return first
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}
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return second
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}
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// Constrain32 limits the given 32-bit integer with the upper and lower bounds
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func Constrain32(val int32, min int32, max int32) int32 {
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if val < min {
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return min
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}
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if val > max {
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return max
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}
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return val
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}
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// Constrain limits the given integer with the upper and lower bounds
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func Constrain(val int, min int, max int) int {
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if val < min {
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return min
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}
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if val > max {
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return max
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}
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return val
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}
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func AsUint16(val int) uint16 {
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if val > math.MaxUint16 {
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return math.MaxUint16
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} else if val < 0 {
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return 0
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}
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return uint16(val)
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}
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// DurWithin limits the given time.Duration with the upper and lower bounds
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func DurWithin(
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val time.Duration, min time.Duration, max time.Duration) time.Duration {
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if val < min {
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return min
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}
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if val > max {
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return max
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}
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return val
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}
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// IsTty returns true is stdin is a terminal
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func IsTty() bool {
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return isatty.IsTerminal(os.Stdin.Fd())
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}
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// Once returns a function that returns the specified boolean value only once
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func Once(nextResponse bool) func() bool {
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state := nextResponse
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return func() bool {
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prevState := state
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state = false
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return prevState
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}
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}
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