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# Catch an exception. Returns 0 if the exception in question was caught.
# The first argument gives the exception to catch, which may be a
# pattern.
# This must be within an always-block. A typical set of handlers looks
# like:
# {
# # try block; something here throws exceptions
# } always {
# if catch MyExcept; then
# # Handler code goes here.
# print Handling exception MyExcept
# elif catch *; then
# # This is the way to implement a catch-all.
# print Handling any other exception
# fi
# }
# As with other languages, exceptions do not need to be handled
# within an always block and may propagate to a handler further up the
# call chain.
#
# It is possible to throw an exception from within the handler by
# using "throw".
#
# The shell variable $CAUGHT is set to the last exception caught,
# which is useful if the argument to "catch" was a pattern.
#
# Use "function" keyword in case catch is already an alias.
function catch {
if [[ $TRY_BLOCK_ERROR -gt 0 && $EXCEPTION = ${~1} ]]; then
(( TRY_BLOCK_ERROR = 0 ))
typeset -g CAUGHT="$EXCEPTION"
unset EXCEPTION
return 0
fi
return 1
}
# Never use globbing with "catch".
alias catch="noglob catch"
catch "$@"
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