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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 "$@"