50 lines
1005 B
Go
50 lines
1005 B
Go
package atlas
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import (
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"math"
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"path/filepath"
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"strings"
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)
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// longestCommonPrefix finds the longest common prefix for all the strings
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// given as an argument, or returns the empty string if a prefix can't be
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// found.
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//
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// This function just uses brute force instead of a more optimized algorithm.
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func longestCommonPrefix(vs []string) string {
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var length int64
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// Find the shortest string
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var shortest string
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length = math.MaxUint32
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for _, v := range vs {
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if int64(len(v)) < length {
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shortest = v
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length = int64(len(v))
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}
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}
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// Now go through and find a prefix to all the strings using this
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// short string, which itself must contain the prefix.
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for i := len(shortest); i > 0; i-- {
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// We only care about prefixes with path seps
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if shortest[i-1] != filepath.Separator {
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continue
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}
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bad := false
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prefix := shortest[0:i]
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for _, v := range vs {
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if !strings.HasPrefix(v, prefix) {
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bad = true
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break
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}
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}
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if !bad {
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return prefix
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}
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}
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return ""
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}
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