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Revision 9027

Added by Aaron Marcuse-Kubitza over 11 years ago

lib/sh/util.sh: exceptions: added save_e, now an alias for e=$?. added save_e/rethrow usage.

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lib/sh/util.sh
45 45 

  		




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#### exceptions


  		




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# usage: cmd || { save_e; ...; rethrow; }


  		




  
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alias save_e='e=$?'


  		




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alias rethrow='return "$e"'


  		




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alias rethrow_subshell='exit "$e"'


  		




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  ......




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if self_being_included; then


  		




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# usage: save_e_cmd cmd... || { use $e (or $?); rethrow; }


  		




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function save_e_cmd () { "$@"; e=$?; rethrow; } # rethrow because e= clears $?


  		




  
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function save_e_cmd () { "$@"; save_e; rethrow; } # rethrow because e= clears $?


  		




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alias save_e_cmd='declare e; save_e_cmd ' # last space alias-expands next word


  		




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function log_e () # usage: log_e cmd... [ || use $e (or $?) ]


  		




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{


  		




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	if "$@"; then :; else # don't use ! because that resets $?


  		




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		e=$?


  		




  
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		save_e


  		




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		echo "! $*" >&2


  		




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		echo "! command exited with error $e" >&2


  		




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		rethrow


  		












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