1 # $Id: modmisc.mk,v 1.1.1.3 2020/07/09 22:35:19 sjg Exp $
3 # miscellaneous modifier tests
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:.
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,}}@
18 all: modvar modvarloop modsysv mod-HTE emptyvar undefvar
19 all: mod-S mod-C mod-at-varname mod-at-resolve
20 all: mod-subst-dollar mod-loop-dollar
23 @echo "The answer is ${libfoo.a:L:libfoo.a=42}"
26 @echo "path='${path}'"
27 @echo "path='${path:${MOD_NODOT}}'"
28 @echo "path='${path:S,home,homes,:${MOD_NODOT}}'"
29 @echo "path=${path:${MOD_NODOTX}:ts:}"
30 @echo "path=${path:${MOD_HOMES}:${MOD_NODOTX}:ts:}"
32 .for d in ${path:${MOD_SEP}:N.} /usr/xbin
33 path_$d?= ${d:${MOD_OPT}:${MOD_HOMES}}/
34 paths+= ${d:${MOD_OPT}:${MOD_HOMES}}
38 @echo "path_/usr/xbin=${path_/usr/xbin}"
39 @echo "paths=${paths}"
40 @echo "PATHS=${paths:tu}"
42 PATHNAMES= a/b/c def a.b.c a.b/c a a.a .gitignore a a.a
44 @echo "dirname of '"${PATHNAMES:Q}"' is '"${PATHNAMES:H:Q}"'"
45 @echo "basename of '"${PATHNAMES:Q}"' is '"${PATHNAMES:T:Q}"'"
46 @echo "suffix of '"${PATHNAMES:Q}"' is '"${PATHNAMES:E:Q}"'"
47 @echo "root of '"${PATHNAMES:Q}"' is '"${PATHNAMES:R:Q}"'"
49 # When a modifier is applied to the "" variable, the result is discarded.
51 @echo S:${:S,^$,empty,}
52 @echo C:${:C,^$,empty,}
53 @echo @:${:@var@${var}@}
55 # The :U modifier turns even the "" variable into something that has a value.
56 # The resulting variable is empty, but is still considered to contain a
57 # single empty word. This word can be accessed by the :S and :C modifiers,
58 # but not by the :@ modifier since it explicitly skips empty words.
60 @echo S:${:U:S,^$,empty,}
61 @echo C:${:U:C,^$,empty,}
62 @echo @:${:U:@var@empty@}
65 @echo :${:Ua b b c:S,a b,,:Q}:
66 @echo :${:Ua b b c:S,a b,,1:Q}:
67 @echo :${:Ua b b c:S,a b,,W:Q}:
68 @echo :${:Ua b b c:S,b,,g:Q}:
69 @echo :${:U1 2 3 1 2 3:S,1 2,___,Wg:S,_,x,:Q}:
72 @echo :${:Ua b b c:C,a b,,:Q}:
73 @echo :${:Ua b b c:C,a b,,1:Q}:
74 @echo :${:Ua b b c:C,a b,,W:Q}:
75 @echo :${:Uword1 word2:C,****,____,g:C,word,____,:Q}:
76 @echo :${:Ua b b c:C,b,,g:Q}:
77 @echo :${:U1 2 3 1 2 3:C,1 2,___,Wg:C,_,x,:Q}:
79 # In the :@ modifier, the name of the loop variable can even be generated
80 # dynamically. There's no practical use-case for this, and hopefully nobody
81 # will ever depend on this, but technically it's possible.
83 @echo :${:Uone two three:@${:Ubar:S,b,v,}@+${var}+@:Q}:
85 # The :@ modifier resolves the variables a little more often than expected.
86 # In particular, it resolves _all_ variables from the context, and not only
87 # the loop variable (in this case v).
89 # The d means direct reference, the i means indirect reference.
90 RESOLVE= ${RES1} $${RES1}
91 RES1= 1d${RES2} 1i$${RES2}
92 RES2= 2d${RES3} 2i$${RES3}
96 @echo $@:${RESOLVE:@v@w${v}w@:Q}:
98 # No matter how many dollar characters there are, they all get merged
99 # into a single dollar by the :S modifier.
101 @echo $@:${:U1:S,^,$,:Q}:
102 @echo $@:${:U2:S,^,$$,:Q}:
103 @echo $@:${:U3:S,^,$$$,:Q}:
104 @echo $@:${:U4:S,^,$$$$,:Q}:
105 @echo $@:${:U5:S,^,$$$$$,:Q}:
106 @echo $@:${:U6:S,^,$$$$$$,:Q}:
107 @echo $@:${:U7:S,^,$$$$$$$,:Q}:
108 @echo $@:${:U8:S,^,$$$$$$$$,:Q}:
109 # This generates no dollar at all:
110 @echo $@:${:UU8:S,^,${:U$$$$$$$$},:Q}:
111 # Here is an alternative way to generate dollar characters.
112 # It's unexpectedly complicated though.
113 @echo $@:${:U:range=5:ts\x24:C,[0-9],,g:Q}:
115 # Demonstrate that it is possible to generate dollar characters using the
118 # These are edge cases that could have resulted in a parse error as well
119 # since the $@ at the end could have been interpreted as a variable, which
120 # would mean a missing closing @ delimiter.
122 @echo $@:${:U1:@word@${word}$@:Q}:
123 @echo $@:${:U2:@word@$${word}$$@:Q}:
124 @echo $@:${:U3:@word@$$${word}$$$@:Q}:
125 @echo $@:${:U4:@word@$$$${word}$$$$@:Q}:
126 @echo $@:${:U5:@word@$$$$${word}$$$$$@:Q}:
127 @echo $@:${:U6:@word@$$$$$${word}$$$$$$@:Q}: