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package main
func stringSliceIndex(s, subs []string) int {
j := 0
if len(subs) > 0 {
for i, x := range s {
if j < len(subs) && subs[j] == x {
j++
} else {
j = 0
}
if len(subs) == j {
return i + 1 - j
}
}
}
return -1
}
// stringSliceReplaceAt replaces the sub-slice find, with the sub-slice replace, in the string
// slice s, returning a new slice and a boolean indicating if the replacement happened.
// requireIdx is the index at which old needs to be found at (or -1 to disregard that).
func stringSliceReplaceAt(s, find, replace []string, requireIndex int) ([]string, bool) {
idx := stringSliceIndex(s, find)
if (requireIndex != -1 && requireIndex != idx) || idx == -1 {
return s, false
}
out := append([]string{}, s[:idx]...)
out = append(out, replace...)
out = append(out, s[idx+len(find):]...)
return out, true
}
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