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[18.09] backport using strings.Builder instead of string appending #1432

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merged 1 commit into from
Oct 17, 2018
Merged

[18.09] backport using strings.Builder instead of string appending #1432

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13 changes: 10 additions & 3 deletions cli/command/image/prune.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@ package image
import (
"context"
"fmt"
"strings"

"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
Expand Down Expand Up @@ -73,14 +74,20 @@ func runPrune(dockerCli command.Cli, options pruneOptions) (spaceReclaimed uint6
}

if len(report.ImagesDeleted) > 0 {
output = "Deleted Images:\n"
var sb strings.Builder
sb.WriteString("Deleted Images:\n")
for _, st := range report.ImagesDeleted {
if st.Untagged != "" {
output += fmt.Sprintln("untagged:", st.Untagged)
sb.WriteString("untagged: ")
sb.WriteString(st.Untagged)
sb.WriteByte('\n')
} else {
output += fmt.Sprintln("deleted:", st.Deleted)
sb.WriteString("deleted: ")
sb.WriteString(st.Deleted)
sb.WriteByte('\n')
}
}
output = sb.String()
spaceReclaimed = report.SpaceReclaimed
}

Expand Down