syncthing/github.com/jessevdk/go-flags/closest.go
2013-12-23 11:18:46 -05:00

62 lines
787 B
Go

package flags
func levenshtein(s string, t string) int {
if len(s) == 0 {
return len(t)
}
if len(t) == 0 {
return len(s)
}
var l1, l2, l3 int
if len(s) == 1 {
l1 = len(t) + 1
} else {
l1 = levenshtein(s[1:len(s)-1], t) + 1
}
if len(t) == 1 {
l2 = len(s) + 1
} else {
l2 = levenshtein(t[1:len(t)-1], s) + 1
}
l3 = levenshtein(s[1:len(s)], t[1:len(t)])
if s[0] != t[0] {
l3 += 1
}
if l2 < l1 {
l1 = l2
}
if l1 < l3 {
return l1
}
return l3
}
func closestChoice(cmd string, choices []string) (string, int) {
if len(choices) == 0 {
return "", 0
}
mincmd := -1
mindist := -1
for i, c := range choices {
l := levenshtein(cmd, c)
if mincmd < 0 || l < mindist {
mindist = l
mincmd = i
}
}
return choices[mincmd], mindist
}