mirror of https://github.com/Llewellynvdm/fzf.git
139 lines
2.5 KiB
Go
139 lines
2.5 KiB
Go
package util
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import (
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"math"
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"os"
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"strings"
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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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"github.com/rivo/uniseg"
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)
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// RunesWidth returns runes width
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func RunesWidth(runes []rune, prefixWidth int, tabstop int, limit int) (int, int) {
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width := 0
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gr := uniseg.NewGraphemes(string(runes))
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idx := 0
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for gr.Next() {
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rs := gr.Runes()
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var w int
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if len(rs) == 1 && rs[0] == '\t' {
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w = tabstop - (prefixWidth+width)%tabstop
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} else {
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s := string(rs)
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w = runewidth.StringWidth(s) + strings.Count(s, "\n")
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}
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width += w
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if width > limit {
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return width, idx
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}
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idx += len(rs)
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}
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return width, -1
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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 if 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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// ToTty returns true if stdout is a terminal
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func ToTty() bool {
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return isatty.IsTerminal(os.Stdout.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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