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/* sbt -- Simple Build Tool
* Copyright 2010 Tony Sloane
*/
package sbt
object StackTrace
{
def isSbtClass(name: String) = name.startsWith("sbt") || name.startsWith("xsbt")
/**
* Return a printable representation of the stack trace associated
* with t. Information about t and its Throwable causes is included.
* The number of lines to be included for each Throwable is configured
* via d which should be greater than or equal to zero. If d is zero,
* then all elements are included up to (but not including) the first
* element that comes from sbt. If d is greater than zero, then up to
* that many lines are included, where the line for the Throwable is
* counted plus one line for each stack element. Less lines will be
* included if there are not enough stack elements.
*/
def trimmed(t : Throwable, d : Int) : String = {
require(d >= 0)
val b = new StringBuilder ()
def appendStackTrace (t : Throwable, first : Boolean) {
val include : StackTraceElement => Boolean =
if (d == 0)
element => !isSbtClass(element.getClassName)
else {
var count = d - 1
(_ => { count -= 1; count >= 0 })
}
def appendElement (e : StackTraceElement) {
b.append ("\tat ")
b.append (e)
b.append ('\n')
}
if (!first)
b.append ("Caused by: ")
b.append (t)
b.append ('\n')
val els = t.getStackTrace ()
var i = 0
while ((i < els.size) && include (els (i))) {
appendElement (els (i))
i += 1
}
}
appendStackTrace (t, true)
var c = t
while (c.getCause () != null) {
c = c.getCause ()
appendStackTrace (c, false)
}
b.toString ()
}
}
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