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# $NetBSD: modmisc.mk,v 1.49 2020/10/24 08:50:17 rillig Exp $
#
# miscellaneous modifier tests
# do not put any dirs in this list which exist on some
# but not all target systems - an exists() check is below.
path= :/bin:/tmp::/:.:/no/such/dir:.
# strip cwd from path.
MOD_NODOT= S/:/ /g:N.:ts:
# and decorate, note that $'s need to be doubled. Also note that
# the modifier_variable can be used with other modifiers.
MOD_NODOTX= S/:/ /g:N.:@d@'$$d'@
# another mod - pretend it is more interesting
MOD_HOMES= S,/home/,/homes/,
MOD_OPT= @d@$${exists($$d):?$$d:$${d:S,/usr,/opt,}}@
MOD_SEP= S,:, ,g
all: modvar modvarloop modsysv emptyvar undefvar
all: mod-quote
all: mod-break-many-words
# See also sysv.mk.
modsysv:
@echo "The answer is ${libfoo.a:L:libfoo.a=42}"
# Demonstrates modifiers that are given indirectly from a variable.
modvar:
@echo "path='${path}'"
@echo "path='${path:${MOD_NODOT}}'"
@echo "path='${path:S,home,homes,:${MOD_NODOT}}'"
@echo "path=${path:${MOD_NODOTX}:ts:}"
@echo "path=${path:${MOD_HOMES}:${MOD_NODOTX}:ts:}"
.for d in ${path:${MOD_SEP}:N.} /usr/xbin
path_$d?= ${d:${MOD_OPT}:${MOD_HOMES}}/
paths+= ${d:${MOD_OPT}:${MOD_HOMES}}
.endfor
modvarloop:
@echo "path_/usr/xbin=${path_/usr/xbin}"
@echo "paths=${paths}"
@echo "PATHS=${paths:tu}"
# When a modifier is applied to the "" variable, the result is discarded.
emptyvar:
@echo S:${:S,^$,empty,}
@echo C:${:C,^$,empty,}
@echo @:${:@var@${var}@}
# The :U modifier turns even the "" variable into something that has a value.
# The resulting variable is empty, but is still considered to contain a
# single empty word. This word can be accessed by the :S and :C modifiers,
# but not by the :@ modifier since it explicitly skips empty words.
undefvar:
@echo S:${:U:S,^$,empty,}
@echo C:${:U:C,^$,empty,}
@echo @:${:U:@var@empty@}
mod-quote:
@echo $@: new${.newline:Q}${.newline:Q}line
# Cover the bmake_realloc in brk_string.
mod-break-many-words:
@echo $@: ${UNDEF:U:range=500:[#]}
# To apply a modifier indirectly via another variable, the whole
# modifier must be put into a single variable.
.if ${value:L:${:US}${:U,value,replacement,}} != "S,value,replacement,}"
. warning unexpected
.endif
# Adding another level of indirection (the 2 nested :U expressions) helps.
.if ${value:L:${:U${:US}${:U,value,replacement,}}} != "replacement"
. warning unexpected
.endif
# Multiple indirect modifiers can be applied one after another as long as
# they are separated with colons.
.if ${value:L:${:US,a,A,}:${:US,e,E,}} != "vAluE"
. warning unexpected
.endif
# An indirect variable that evaluates to the empty string is allowed though.
# This makes it possible to define conditional modifiers, like this:
#
# M.little-endian= S,1234,4321,
# M.big-endian= # none
.if ${value:L:${:Dempty}S,a,A,} != "vAlue"
. warning unexpected
.endif
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