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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
// Package textui implements utilities for emitting human-friendly
// text on stdout and stderr.
package textui
import (
"fmt"
"io"
"math"
"golang.org/x/exp/constraints"
"golang.org/x/text/language"
"golang.org/x/text/message"
"golang.org/x/text/number"
"git.lukeshu.com/btrfs-progs-ng/lib/fmtutil"
)
var printer = message.NewPrinter(language.English)
// Fprintf is like `fmt.Fprintf`, but (1) includes the extensions of
// `golang.org/x/text/message.Printer`, and (2) is useful for marking
// when a print call is part of the UI, rather than something
// internal.
func Fprintf(w io.Writer, key string, a ...any) (n int, err error) {
return printer.Fprintf(w, key, a...)
}
// Sprintf is like `fmt.Sprintf`, but (1) includes the extensions of
// `golang.org/x/text/message.Printer`, and (2) is useful for marking
// when a sprint call is part of the UI, rather than something
// internal.
func Sprintf(key string, a ...any) string {
return printer.Sprintf(key, a...)
}
// Humanized wraps a value such that formatting of it can make use of
// the `golang.org/x/text/message.Printer` extensions even when used
// with plain-old `fmt`.
func Humanized(x any) any {
return humanized{val: x}
}
type humanized struct {
val any
}
var (
_ fmt.Formatter = humanized{}
_ fmt.Stringer = humanized{}
)
// String implements fmt.Formatter.
func (h humanized) Format(f fmt.State, verb rune) {
_, _ = printer.Fprintf(f, fmtutil.FmtStateString(f, verb), h.val)
}
// String implements fmt.Stringer.
func (h humanized) String() string {
return fmt.Sprint(h)
}
// Portion renders a fraction N/D as both a percentage and
// parenthetically as the exact fractional value, rendered with
// human-friendly commas.
//
// For example:
//
// fmt.Sprint(Portion[int]{N: 1, D: 12345}) ⇒ "0% (1/12,345)"
type Portion[T constraints.Integer] struct {
N, D T
}
var _ fmt.Stringer = Portion[int]{}
// String implements fmt.Stringer.
func (p Portion[T]) String() string {
pct := uint64(100)
if p.D > 0 {
pct = (uint64(p.N) * 100) / uint64(p.D)
}
return printer.Sprintf("%d%% (%v/%v)", pct, uint64(p.N), uint64(p.D))
}
type metric[T constraints.Integer | constraints.Float] struct {
Val T
Unit string
}
var (
_ fmt.Formatter = metric[int]{}
_ fmt.Stringer = metric[int]{}
)
func Metric[T constraints.Integer | constraints.Float](x T, unit string) metric[T] {
return metric[T]{
Val: x,
Unit: unit,
}
}
var metricSmallPrefixes = []string{
"m",
"μ",
"n",
"p",
"f",
"a",
"z",
"y",
"r",
"q",
}
var metricBigPrefixes = []string{
"k",
"M",
"G",
"T",
"P",
"E",
"Z",
"Y",
"R",
"Q",
}
// String implements fmt.Formatter.
func (v metric[T]) Format(f fmt.State, verb rune) {
var prefix string
y := math.Abs(float64(v.Val))
if y < 1 {
for i := 0; y < 1 && i <= len(metricSmallPrefixes); i++ {
y *= 1000
prefix = metricSmallPrefixes[i]
}
} else {
for i := 0; y > 1000 && i <= len(metricBigPrefixes); i++ {
y /= 1000
prefix = metricBigPrefixes[i]
}
}
if v.Val < 0 {
y = -y
}
_, _ = printer.Fprintf(f, fmtutil.FmtStateString(f, verb)+"%s%s",
y, prefix, v.Unit)
}
// String implements fmt.Stringer.
func (v metric[T]) String() string {
return fmt.Sprint(v)
}
type iec[T constraints.Integer | constraints.Float] struct {
Val T
Unit string
}
var (
_ fmt.Formatter = iec[int]{}
_ fmt.Stringer = iec[int]{}
)
func IEC[T constraints.Integer | constraints.Float](x T, unit string) iec[T] {
return iec[T]{
Val: x,
Unit: unit,
}
}
var iecPrefixes = []string{
"Ki",
"Mi",
"Gi",
"Ti",
"Pi",
"Ei",
"Zi",
"Yi",
}
// String implements fmt.Formatter.
func (v iec[T]) Format(f fmt.State, verb rune) {
var prefix string
y := math.Abs(float64(v.Val))
for i := 0; y > 1024 && i <= len(iecPrefixes); i++ {
y /= 1024
prefix = iecPrefixes[i]
}
if v.Val < 0 {
y = -y
}
_, _ = printer.Fprintf(f, fmtutil.FmtStateString(f, verb)+"%s%s",
number.Decimal(y), prefix, v.Unit)
}
// String implements fmt.Stringer.
func (v iec[T]) String() string {
return fmt.Sprint(v)
}
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