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varmod-assign.mk revision 1.2 
      1  1.2  rillig # $NetBSD: varmod-assign.mk,v 1.2 2020/08/16 12:48:55 rillig Exp $
      2  1.1  rillig #
      3  1.2  rillig # Tests for the obscure ::= variable modifiers, which perform variable
      4  1.2  rillig # assignments during evaluation, just like the = operator in C.
      5  1.1  rillig 
      6  1.2  rillig all:	mod-assign
      7  1.2  rillig all:	mod-assign-nested
      8  1.1  rillig 
      9  1.2  rillig mod-assign:
     10  1.2  rillig 	@echo $@: ${1 2 3:L:@i@${FIRST::?=$i}@} first=${FIRST}.
     11  1.2  rillig 	@echo $@: ${1 2 3:L:@i@${LAST::=$i}@} last=${LAST}.
     12  1.2  rillig 	@echo $@: ${1 2 3:L:@i@${APPENDED::+=$i}@} appended=${APPENDED}.
     13  1.2  rillig 	@echo $@: ${echo.1 echo.2 echo.3:L:@i@${RAN::!=${i:C,.*,&; & 1>\&2,:S,., ,g}}@} ran:${RAN}.
     14  1.2  rillig 	# The assignments happen in the global scope and thus are
     15  1.2  rillig 	# preserved even after the shell command has been run.
     16  1.2  rillig 	@echo $@: global: ${FIRST:Q}, ${LAST:Q}, ${APPENDED:Q}, ${RAN:Q}.
     17  1.2  rillig 
     18  1.2  rillig mod-assign-nested:
     19  1.2  rillig 	@echo $@: ${1:?${THEN1::=then1${IT1::=t1}}:${ELSE1::=else1${IE1::=e1}}}${THEN1}${ELSE1}${IT1}${IE1}
     20  1.2  rillig 	@echo $@: ${0:?${THEN2::=then2${IT2::=t2}}:${ELSE2::=else2${IE2::=e2}}}${THEN2}${ELSE2}${IT2}${IE2}
     21  1.2  rillig 	@echo $@: ${SINK3:Q}
     22  1.2  rillig 	@echo $@: ${SINK4:Q}
     23  1.2  rillig SINK3:=	${1:?${THEN3::=then3${IT3::=t3}}:${ELSE3::=else3${IE3::=e3}}}${THEN3}${ELSE3}${IT3}${IE3}
     24  1.2  rillig SINK4:=	${0:?${THEN4::=then4${IT4::=t4}}:${ELSE4::=else4${IE4::=e4}}}${THEN4}${ELSE4}${IT4}${IE4}
     25