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