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df520db380
We can still get useful error messages out of d.Try without specifically wrapping every single thing that might throw a noms UsageError, so do so. The code is cleaner. Towards issue #176
26 lines
442 B
Go
26 lines
442 B
Go
package d
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// Try calls f() and recovers from any panics caused by using d.Exp. The error generated by the call to d.Exp is returned.
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func Try(f func()) (err error) {
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defer nomsRecover(&err)
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f()
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return
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}
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type UsageError struct {
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msg string
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}
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func (e UsageError) Error() string {
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return e.msg
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}
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func nomsRecover(errp *error) {
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if r := recover(); r != nil {
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if _, ok := r.(UsageError); !ok {
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panic(r)
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}
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*errp = r.(error)
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}
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}
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