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strings.go
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strings.go
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package u
import (
"os"
"path/filepath"
"strings"
)
// NormalizeNewlinesInPlace changes CRLF (Windows) and
// CR (Mac) to LF (Unix)
// Optimized for speed, modifies data in place
func NormalizeNewlinesInPlace(d []byte) []byte {
wi := 0
n := len(d)
for i := 0; i < n; i++ {
c := d[i]
// 13 is CR
if c != 13 {
d[wi] = c
wi++
continue
}
// replace CR (mac / win) with LF (unix)
d[wi] = 10
wi++
if i < n-1 && d[i+1] == 10 {
// this was CRLF, so skip the LF
i++
}
}
return d[:wi]
}
// NormalizeNewlines is like NormalizeNewlinesInPlace but
// slower because it makes a copy of data
func NormalizeNewlines(d []byte) []byte {
d = append([]byte{}, d...)
return NormalizeNewlinesInPlace(d)
}
// Capitalize does foo => Foo, BAR => Bar etc.
func Capitalize(s string) string {
if len(s) == 0 {
return s
}
s = strings.ToLower(s)
return strings.ToUpper(s[0:1]) + s[1:]
}
// TrimPrefix is like strings.TrimPrefix but also returns a bool
// indicating that the string was trimmed
func TrimPrefix(s string, prefix string) (string, bool) {
s2 := strings.TrimPrefix(s, prefix)
return s2, len(s) != len(s2)
}
func ToTrimmedLines(d []byte) []string {
lines := strings.Split(string(d), "\n")
i := 0
for _, l := range lines {
l = strings.TrimSpace(l)
// remove empty lines
if len(l) > 0 {
lines[i] = l
i++
}
}
return lines[:i]
}
// TrimExt removes extension from s
func TrimExt(s string) string {
idx := strings.LastIndex(s, ".")
if idx == -1 {
return s
}
return s[:idx]
}
// ExtEqualFold returns true if s ends with extension (e.g. ".html")
// case-insensitive
func ExtEqualFold(s string, ext string) bool {
e := filepath.Ext(s)
return strings.EqualFold(e, ext)
}
func AppendNewline(s *string) string {
if strings.HasSuffix(*s, "\n") {
return *s
}
*s = *s + "\n"
return *s
}
func CollapseMultipleNewlines(s string) string {
s = strings.ReplaceAll(s, "\r\n", "\n") // CRLF => CR
prev := ""
for prev != s {
prev = s
s = strings.ReplaceAll(s, "\n\n\n", "\n\n")
}
return s
}
func AppendOrReplaceInText(orig string, toAppend string, delim string) string {
AppendNewline(&toAppend)
AppendNewline(&delim)
content := "\n\n" + delim + toAppend + delim
if strings.Contains(orig, content) {
return CollapseMultipleNewlines(orig)
}
start := strings.Index(orig, delim)
if start < 0 {
return CollapseMultipleNewlines(orig + content)
}
end := strings.Index(orig[start+1:], delim)
PanicIf(end == -1, "didn't find end delim")
end += start + 1
orig = orig[:start] + "\n\n" + orig[end+len(delim):]
res := AppendNewline(&orig) + content
return CollapseMultipleNewlines(res)
}
func AppendOrReplaceInFileMust(path string, toAppend string, delim string) bool {
st, err := os.Lstat(path)
must(err)
perm := st.Mode().Perm()
orig, err := os.ReadFile(path)
must(err)
newContent := AppendOrReplaceInText(string(orig), toAppend, delim)
if newContent == string(orig) {
return false
}
err = os.WriteFile(path, []byte(newContent), perm)
must(err)
return true
}
func ExpandTildeInPath(s string) string {
if strings.HasPrefix(s, "~") {
dir, err := os.UserHomeDir()
must(err)
return dir + s[1:]
}
return s
}
func ParseEnvMust(d []byte) map[string]string {
d = NormalizeNewlines(d)
s := string(d)
lines := strings.Split(s, "\n")
m := make(map[string]string)
for _, line := range lines {
line = strings.TrimSpace(line)
if line == "" || strings.HasPrefix(line, "#") {
continue
}
parts := strings.SplitN(line, "=", 2)
PanicIf(len(parts) != 2, "invalid line '%s' in .env\n", line)
key := strings.TrimSpace(parts[0])
val := strings.TrimSpace(parts[1])
m[key] = val
}
return m
}