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31 lines
1022 B
Plaintext
31 lines
1022 B
Plaintext
# Throw an exception.
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# The first argument is a string giving the exception. Other arguments
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# are ignored.
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#
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# This is designed to be called somewhere inside a "try-block", i.e.
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# some code of the form:
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# {
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# # try-block
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# } always {
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# # always-block
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# }
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# although as normal with exceptions it might be hidden deep inside
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# other code. Note, however, that it must be code running within the
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# current shell; with shells, unlike other languages, it is quite easy
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# to miss points at which the shell forks.
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#
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# If there is nothing to catch an exception, this behaves like any
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# other shell error, aborting to the command prompt or abandoning a
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# script.
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# The following must not be local.
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typeset -g EXCEPTION="$1"
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readonly THROW
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if (( TRY_BLOCK_ERROR == 0 )); then
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# We are throwing an exception from the middle of an always-block.
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# We can do this by restoring the error status from the try-block.
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(( TRY_BLOCK_ERROR = 1 ))
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fi
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# Raise an error, but don't show an error message.
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THROW= 2>/dev/null
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