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misc.go
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misc.go
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package main
import (
"fmt"
"path/filepath"
"regexp"
"strconv"
"strings"
"unicode"
"github.com/mattn/go-runewidth"
)
func isRoot(name string) bool { return filepath.Dir(name) == name }
func replaceTilde(s string) string {
if strings.HasPrefix(s, "~") {
s = strings.Replace(s, "~", gUser.HomeDir, 1)
}
return s
}
func runeSliceWidth(rs []rune) int {
w := 0
for _, r := range rs {
w += runewidth.RuneWidth(r)
}
return w
}
func runeSliceWidthRange(rs []rune, beg, end int) []rune {
curr := 0
b := 0
for i, r := range rs {
w := runewidth.RuneWidth(r)
switch {
case curr == beg:
b = i
case curr < beg && curr+w > beg:
b = i + 1
case curr == end:
return rs[b:i]
case curr > end:
return rs[b : i-1]
}
curr += w
}
return nil
}
// This function is used to escape whitespaces and special characters with
// backlashes in a given string.
func escape(s string) string {
buf := make([]rune, 0, len(s))
for _, r := range s {
if unicode.IsSpace(r) || r == '\\' || r == ';' || r == '#' {
buf = append(buf, '\\')
}
buf = append(buf, r)
}
return string(buf)
}
// This function is used to remove backlashes that are used to escape
// whitespaces and special characters in a given string.
func unescape(s string) string {
esc := false
buf := make([]rune, 0, len(s))
for _, r := range s {
if esc {
if !unicode.IsSpace(r) && r != '\\' && r != ';' && r != '#' {
buf = append(buf, '\\')
}
buf = append(buf, r)
esc = false
continue
}
if r == '\\' {
esc = true
continue
}
esc = false
buf = append(buf, r)
}
if esc {
buf = append(buf, '\\')
}
return string(buf)
}
// This function splits the given string by whitespaces. It is aware of escaped
// whitespaces so that they are not splitted unintentionally.
func tokenize(s string) []string {
esc := false
var buf []rune
var toks []string
for _, r := range s {
if r == '\\' {
esc = true
buf = append(buf, r)
continue
}
if esc {
esc = false
buf = append(buf, r)
continue
}
if !unicode.IsSpace(r) {
buf = append(buf, r)
} else {
toks = append(toks, string(buf))
buf = nil
}
}
toks = append(toks, string(buf))
return toks
}
// This function splits the first word of a string delimited by whitespace from
// the rest. This is used to tokenize a string one by one without touching the
// rest. Whitespace on the left side of both the word and the rest are trimmed.
func splitWord(s string) (word, rest string) {
s = strings.TrimLeftFunc(s, unicode.IsSpace)
ind := len(s)
for i, c := range s {
if unicode.IsSpace(c) {
ind = i
break
}
}
word = s[0:ind]
rest = strings.TrimLeftFunc(s[ind:], unicode.IsSpace)
return
}
// This function converts a size in bytes to a human readable form using metric
// suffixes (e.g. 1K = 1000). For values less than 10 the first significant
// digit is shown, otherwise it is hidden. Numbers are always rounded down.
// This should be fine for most human beings.
func humanize(size int64) string {
if size < 1000 {
return fmt.Sprintf("%dB", size)
}
suffix := []string{
"K", // kilo
"M", // mega
"G", // giga
"T", // tera
"P", // peta
"E", // exa
"Z", // zeta
"Y", // yotta
}
curr := float64(size) / 1000
for _, s := range suffix {
if curr < 10 {
return fmt.Sprintf("%.1f%s", curr-0.0499, s)
} else if curr < 1000 {
return fmt.Sprintf("%d%s", int(curr), s)
}
curr /= 1000
}
return ""
}
// This regexp is used to partition a given string as numbers and non-numbers.
// For instance, if your input is 'foo123bar456' you get a slice of 'foo',
// '123', 'bar', and '456'. This is useful for natural sorting which takes into
// account values of numbers within strings.
var rePart = regexp.MustCompile(`\d+|\D+`)
func naturalLess(s1, s2 string) bool {
parts1 := rePart.FindAllString(s1, -1)
parts2 := rePart.FindAllString(s2, -1)
for i := 0; i < len(parts1) && i < len(parts2); i++ {
if parts1[i] == parts2[i] {
continue
}
num1, err1 := strconv.Atoi(parts1[i])
num2, err2 := strconv.Atoi(parts2[i])
if err1 == nil && err2 == nil {
return num1 < num2
}
return parts1[i] < parts2[i]
}
return len(parts1) < len(parts2)
}
var reAltKey = regexp.MustCompile(`<a-(.)>`)
var reWord = regexp.MustCompile(`(\pL|\pN)+`)
var reWordBeg = regexp.MustCompile(`([^\pL\pN]|^)(\pL|\pN)`)
var reWordEnd = regexp.MustCompile(`(\pL|\pN)([^\pL\pN]|$)`)
func min(a, b int) int {
if a < b {
return a
}
return b
}
func max(a, b int) int {
if a > b {
return a
}
return b
}
// We don't need no generic code
// We don't need no type control
// No dark templates in compiler
// Haskell leave them kids alone
// Hey Bjarne leave them kids alone
// All in all it's just another brick in the code
// All in all you're just another brick in the code
//
// -- Pink Trolled --