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promtool: Print block meta-data slightly more nicely
I initially thought I could somehow rescue the current column layout by recycling the tabwriter, but flushing completely blanks it. However, by setting a minimum width of 13, we get a slightly broader DURATION column but otherwise nice formatting, unless numbers get really big, but that's OK, I guess. Before: ``` BLOCK ULID MIN TIME MAX TIME DURATION NUM SAMPLES NUM CHUNKS NUM SERIES SIZE 01ETN0KGNP5WWK9T5QMQGBG9F1 2020-11-19 07:39:17 +0000 UTC 2020-11-19 07:44:17 +0000 UTC 5m0.001s 8 2 2 624B 01ETN0KGQSFF0AB2QDZVQG3CWC 2020-11-19 10:25:57 +0000 UTC 2020-11-19 10:30:57 +0000 UTC 5m0.001s 8 2 2 622B 01ETN0KGSW8KYP3YPG4X20P60Z 2020-11-19 13:12:37 +0000 UTC 2020-11-19 13:17:37 +0000 UTC 5m0.001s 8 2 2 625B ``` After: ``` BLOCK ULID MIN TIME MAX TIME DURATION NUM SAMPLES NUM CHUNKS NUM SERIES SIZE 01ETN0R72SXN9A1FG732P7KFFN 2020-11-19 07:39:17 +0000 UTC 2020-11-19 07:44:17 +0000 UTC 5m0.001s 8 2 2 624B 01ETN0R74Y9AG1A1MKN4MZK7WM 2020-11-19 10:25:57 +0000 UTC 2020-11-19 10:30:57 +0000 UTC 5m0.001s 8 2 2 622B 01ETN0R76KXZ5VQECMDNES49J6 2020-11-19 13:12:37 +0000 UTC 2020-11-19 13:17:37 +0000 UTC 5m0.001s 8 2 2 625B ``` After without the `-r` flag: ``` BLOCK ULID MIN TIME MAX TIME DURATION NUM SAMPLES NUM CHUNKS NUM SERIES SIZE 01ETN0RFFJ42274NWR1GH0RTV6 1605771557000 1605771857001 5m0.001s 8 2 2 624 01ETN0RFJ1MZCHHS2SBZS8XC27 1605781557000 1605781857001 5m0.001s 8 2 2 622 01ETN0RFM98N3V4KD2DZXFGHGN 1605791557000 1605791857001 5m0.001s 8 2 2 625 ``` Signed-off-by: beorn7 <beorn@grafana.com>
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@ -359,7 +359,7 @@ func listBlocks(path string, humanReadable bool) error {
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}
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func printBlocks(blocks []tsdb.BlockReader, writeHeader, humanReadable bool) {
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tw := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
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tw := tabwriter.NewWriter(os.Stdout, 13, 0, 2, ' ', 0)
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defer tw.Flush()
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if writeHeader {
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