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      1 # $NetBSD: modmisc.mk,v 1.53 2023/06/16 07:20:45 rillig Exp $
      2 #
      3 # miscellaneous modifier tests
      4 
      5 # do not put any dirs in this list which exist on some
      6 # but not all target systems - an exists() check is below.
      7 path=		:/bin:/tmp::/:.:/no/such/dir:.
      8 # strip cwd from path.
      9 MOD_NODOT=	S/:/ /g:N.:ts:
     10 # and decorate, note that $'s need to be doubled. Also note that
     11 # the modifier_variable can be used with other modifiers.
     12 MOD_NODOTX=	S/:/ /g:N.:@d@'$$d'@
     13 # another mod - pretend it is more interesting
     14 MOD_HOMES=	S,/home/,/homes/,
     15 MOD_OPT=	@d@$${exists($$d):?$$d:$${d:S,/usr,/opt,}}@
     16 MOD_SEP=	S,:, ,g
     17 
     18 all:	modvar modvarloop emptyvar undefvar
     19 all:	mod-quote
     20 all:	mod-break-many-words
     21 
     22 # Demonstrates modifiers that are given indirectly from a variable.
     23 modvar:
     24 	@echo "path='${path}'"
     25 	@echo "path='${path:${MOD_NODOT}}'"
     26 	@echo "path='${path:S,home,homes,:${MOD_NODOT}}'"
     27 	@echo "path=${path:${MOD_NODOTX}:ts:}"
     28 	@echo "path=${path:${MOD_HOMES}:${MOD_NODOTX}:ts:}"
     29 
     30 .for d in ${path:${MOD_SEP}:N.} /usr/xbin
     31 path_$d?=	${d:${MOD_OPT}:${MOD_HOMES}}/
     32 paths+=		${d:${MOD_OPT}:${MOD_HOMES}}
     33 .endfor
     34 
     35 modvarloop:
     36 	@echo "path_/usr/xbin=${path_/usr/xbin}"
     37 	@echo "paths=${paths}"
     38 	@echo "PATHS=${paths:tu}"
     39 
     40 # When a modifier is applied to the "" variable, the result is discarded.
     41 emptyvar:
     42 	@echo S:${:S,^$,empty,}
     43 	@echo C:${:C,^$,empty,}
     44 	@echo @:${:@var@${var}@}
     45 
     46 # The :U modifier turns even the "" variable into something that has a value.
     47 # The value of the resulting expression is empty, but is still considered to
     48 # contain a single empty word. This word can be accessed by the :S and :C
     49 # modifiers, but not by the :@ modifier since it explicitly skips empty words.
     50 undefvar:
     51 	@echo S:${:U:S,^$,empty,}
     52 	@echo C:${:U:C,^$,empty,}
     53 	@echo @:${:U:@var@empty@}
     54 
     55 
     56 mod-quote:
     57 	@echo $@: new${.newline:Q}${.newline:Q}line
     58 
     59 # Cover the bmake_realloc in Substring_Words.
     60 mod-break-many-words:
     61 	@echo $@: ${UNDEF:U:range=500:[#]}
     62