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// Package strings contains functions to manipulate strings
package strings
import (
"fmt"
"math"
"regexp"
"sort"
"strings"
"github.com/Masterminds/goutils"
"github.com/hairyhenderson/gomplate/v4/conv"
"golang.org/x/text/cases"
"golang.org/x/text/language"
)
// Indent - indent each line of the string with the given indent string.
// Any indent characters are permitted, except for '\n'.
func Indent(width int, indent, s string) (string, error) {
if width <= 0 {
return "", fmt.Errorf("width must be > 0")
}
if strings.Contains(indent, "\n") {
return "", fmt.Errorf("indent must not contain '\\n'")
}
if width > 1 {
indent = strings.Repeat(indent, width)
}
lines := strings.Count(s, "\n")
res := make([]byte, 0, len(s)+len(indent)*lines)
bol := true
for i := range len(s) {
c := s[i]
if bol && c != '\n' {
res = append(res, indent...)
}
res = append(res, c)
bol = c == '\n'
}
return string(res), nil
}
// ShellQuote - generate a POSIX shell literal evaluating to a string
func ShellQuote(s string) string {
return "'" + strings.ReplaceAll(s, "'", "'\"'\"'") + "'"
}
// Trunc - truncate a string to the given length
func Trunc(length int, s string) string {
if length < 0 {
return s
}
if len(s) <= length {
return s
}
return s[0:length]
}
// Sort - return an alphanumerically-sorted list of strings
//
// Deprecated: use coll.Sort instead
func Sort(list []string) []string {
sorted := sort.StringSlice(list)
sorted.Sort()
return sorted
}
var (
spaces = regexp.MustCompile(`\s+`)
nonAlphaNum = regexp.MustCompile(`[^\pL\pN]+`)
)
// SnakeCase -
func SnakeCase(in string) string {
s := casePrepare(in)
return spaces.ReplaceAllString(s, "_")
}
// KebabCase -
func KebabCase(in string) string {
s := casePrepare(in)
return spaces.ReplaceAllString(s, "-")
}
func casePrepare(in string) string {
in = strings.TrimSpace(in)
s := strings.ToLower(in)
// make sure the first letter remains lower- or upper-cased
s = strings.Replace(s, string(s[0]), string(in[0]), 1)
s = nonAlphaNum.ReplaceAllString(s, " ")
return strings.TrimSpace(s)
}
// CamelCase -
func CamelCase(in string) string {
in = strings.TrimSpace(in)
tag := language.Und
s := cases.Title(tag).String(conv.ToString(in))
// make sure the first letter remains lower- or upper-cased
s = strings.Replace(s, string(s[0]), string(in[0]), 1)
return nonAlphaNum.ReplaceAllString(s, "")
}
// WordWrapOpts defines the options to apply to the WordWrap function
type WordWrapOpts struct {
// Line-break sequence to insert (defaults to "\n")
LBSeq string
// The desired maximum line length in characters (defaults to 80)
Width uint32
}
// applies default options
func wwDefaults(opts WordWrapOpts) WordWrapOpts {
if opts.Width == 0 {
opts.Width = 80
}
if opts.LBSeq == "" {
opts.LBSeq = "\n"
}
return opts
}
// WordWrap - insert line-breaks into the string, before it reaches the given
// width.
func WordWrap(in string, opts WordWrapOpts) string {
opts = wwDefaults(opts)
// if we're on a 32-bit system, we need to check for overflow. If the width
// is greater than maxint, we'll just use maxint.
width := int(opts.Width)
if width == -1 {
width = int(math.MaxInt)
}
return goutils.WrapCustom(in, width, opts.LBSeq, false)
}
// SkipLines - skip the given number of lines (ending with \n) from the string.
// If skip is greater than the number of lines in the string, an empty string is
// returned.
func SkipLines(skip int, in string) (string, error) {
if skip < 0 {
return "", fmt.Errorf("skip must be >= 0")
}
if skip == 0 {
return in, nil
}
lines := strings.SplitN(in, "\n", skip+1)
if skip >= len(lines) {
return "", nil
}
return lines[skip], nil
}
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