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# $Id: varmisc.mk,v 1.1.1.2 2020/05/24 05:35:53 nia Exp $
#
# Miscellaneous variable tests.
all: unmatched_var_paren D_true U_true D_false U_false Q_lhs Q_rhs NQ_none \
strftime cmpv
unmatched_var_paren:
@echo ${foo::=foo-text}
True = ${echo true >&2:L:sh}TRUE
False= ${echo false >&2:L:sh}FALSE
VSET= is set
.undef UNDEF
U_false:
@echo :U skipped when var set
@echo ${VSET:U${False}}
D_false:
@echo :D skipped if var undef
@echo ${UNDEF:D${False}}
U_true:
@echo :U expanded when var undef
@echo ${UNDEF:U${True}}
D_true:
@echo :D expanded when var set
@echo ${VSET:D${True}}
Q_lhs:
@echo :? only lhs when value true
@echo ${1:L:?${True}:${False}}
Q_rhs:
@echo :? only rhs when value false
@echo ${0:L:?${True}:${False}}
NQ_none:
@echo do not evaluate or expand :? if discarding
@echo ${VSET:U${1:L:?${True}:${False}}}
April1= 1459494000
# slightly contorted syntax to use utc via variable
strftime:
@echo ${year=%Y month=%m day=%d:L:gmtime=1459494000}
@echo date=${%Y%m%d:L:${gmtime=${April1}:L}}
# big jumps to handle 3 digits per step
M_cmpv.units = 1 1000 1000000
M_cmpv = S,., ,g:_:range:@i@+ $${_:[-$$i]} \* $${M_cmpv.units:[$$i]}@:S,^,expr 0 ,1:sh
Version = 123.456.789
cmpv.only = target specific vars
cmpv:
@echo Version=${Version} == ${Version:${M_cmpv}}
@echo Literal=3.4.5 == ${3.4.5:L:${M_cmpv}}
@echo We have ${${.TARGET:T}.only}
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