CODEWITHSUNDEEP
gopath
noamt
noamt

Reputation: 7805

How do I get the root directory of a relative path

I need to extract the name first of the first directory in a relative path.

I know I can go about:

relPath := "a/b/c/file.so"
splitPath := strings.Split(relPath, string(os.PathSeparator))
rootDirName := splitPath[0]

Is there a better way?

Upvotes: 2

Views: 479

Answers (1)

Joris
Joris

Reputation: 881

If you're asking whether there is way to do it with 1 standard Go function: not that I know of.

An alternative way would be:

relPath := "a/b/c/file.so"
i := strings.Index(relPath, string(os.PathSeparator))
rootDirName := relPath[:i]

Or if it is possible that the path contains no / at all:

relPath := "a/b/c/file.so"
i := strings.Index(relPath, string(os.PathSeparator))
rootDirName := ""
if i != -1 {
    rootDirName = relPath[:i]
}

This has the benefit of not having to split the whole string and might, therefore, be a little faster on long paths.

Upvotes: 3

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