Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2852#issuecomment-60339925
My latest commit cleans up the messy `customCol` and adds a builder-like
pattern to the columns, too, so you have this nice, declarative-looking style
for customizing columns' sorting / formatting / markup behavior:
```scala
private val workerTable: UITable[WorkerInfo] = {
val t = new UITableBuilder[WorkerInfo]()
t.col("ID") (identity) withMarkup { worker =>
<a href={worker.webUiAddress}>{worker.id}</a>
}
t.col("Address") { worker => s"${worker.host}:${worker.port}"}
t.col("State") { _.state.toString }
t.col("Cores") { _.coresUsed } formatWith { c: Int => s"$c Used" }
t.col("Memory") (identity) sortBy { worker =>
s"${worker.memory}:${worker.memoryUsed}"
} withMarkup { worker =>
Text(Utils.megabytesToString(worker.memory)) ++
Text(Utils.megabytesToString(worker.memoryUsed))
}
t.build()
}
```
I know that a lot of folks dislike the infix syntax; I'm a fan of it here
for these `sortBy` -> `withMarkup` chains, but I'm pretty flexible on this.
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