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browse: When sorting by size, offset directories

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Assigns negative sizes to directories in order to have them listed reliably
before any zero-sized files. That order is what most users expect when
sorting by size.

As side effect directories will appear before files on all filesystem
implementations. To give an example: before this change directories had a size
of 4 KiB when using Linux with ext4 or tmpfs, and with ZFS a size resembling
an estimation of the number of leaves within said directory.
This commit is contained in:
W-Mark Kubacki 2016-04-18 23:05:08 +02:00
parent 1d38d113f8
commit 239f6825f7
1 changed files with 14 additions and 3 deletions
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13
middleware/browse/browse.go
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@ -137,7 +137,18 @@ func (l byName) Less(i, j int) bool {
// By Size
func (l bySize) Len() int { return len(l.Items) }
func (l bySize) Swap(i, j int) { l.Items[i], l.Items[j] = l.Items[j], l.Items[i] }
func (l bySize) Less(i, j int) bool { return l.Items[i].Size < l.Items[j].Size }
const directoryOffset = -1 << 31 // = math.MinInt32
func (l bySize) Less(i, j int) bool {
iSize, jSize := l.Items[i].Size, l.Items[j].Size
if l.Items[i].IsDir {
iSize = directoryOffset + iSize
}
if l.Items[j].IsDir {
jSize = directoryOffset + jSize
}
return iSize < jSize
}
// By Time
func (l byTime) Len() int { return len(l.Items) }