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45 lines
1.0 KiB
45 lines
1.0 KiB
package ioutils
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import (
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"os"
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"sort"
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)
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// byName implements sort.Interface for sorting os.FileInfo list.
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type byName []os.FileInfo
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func (f byName) Len() int { return len(f) }
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func (f byName) Less(i, j int) bool { return f[i].Name() < f[j].Name() }
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func (f byName) Swap(i, j int) { f[i], f[j] = f[j], f[i] }
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// ReadDirN reads the directory named by dirname and returns
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// a list of sorted directory entries of size 'n'.
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func ReadDirN(dirname string, n int) ([]os.FileInfo, error) {
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f, err := os.Open(dirname)
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if err != nil {
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return nil, err
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}
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list, err := f.Readdir(n)
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f.Close()
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if err != nil {
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return nil, err
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}
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sort.Sort(byName(list))
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return list, nil
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}
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// ReadDirNamesN reads the directory named by dirname and returns
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// a list of sorted directory names of size 'n'.
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func ReadDirNamesN(dirname string, n int) ([]string, error) {
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f, err := os.Open(dirname)
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if err != nil {
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return nil, err
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}
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names, err := f.Readdirnames(n)
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f.Close()
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if err != nil {
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return nil, err
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}
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sort.Strings(names)
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return names, nil
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}
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