1	#!/usr/bin/env bash
2
3	#### no expansion
4	echo {foo}
5	## stdout: {foo}
6
7	#### incomplete trailing expansion
8	echo {a,b}_{
9	## stdout: a_{ b_{
10	## OK osh stdout: {a,b}_{
11
12	#### partial leading expansion
13	echo }_{a,b}
14	## stdout: }_a }_b
15	## OK osh stdout: }_{a,b}
16
17	#### partial leading expansion 2
18	echo {x}_{a,b}
19	## stdout: {x}_a {x}_b
20	## OK osh stdout: {x}_{a,b}
21
22	#### } in expansion
23	# hm they treat this the SAME. Leftmost { is matched by first }, and then
24	# there is another } as the postfix.
25	echo {a,b}}
26	## stdout: a} b}
27	## status: 0
28	## OK osh stdout: {a,b}}
29	## OK zsh stdout-json: ""
30	## OK zsh status: 1
31
32	#### single expansion
33	echo {foo,bar}
34	## stdout: foo bar
35
36	#### double expansion
37	echo {a,b}_{c,d}
38	## stdout: a_c a_d b_c b_d
39
40	#### triple expansion
41	echo {0,1}{0,1}{0,1}
42	## stdout: 000 001 010 011 100 101 110 111
43
44	#### double expansion with single and double quotes
45	echo {'a',b}_{c,"d"}
46	## stdout: a_c a_d b_c b_d
47
48	#### expansion with mixed quotes
49	echo -{\X"b",'cd'}-
50	## stdout: -Xb- -cd-
51
52	#### expansion with simple var
53	a=A
54	echo -{$a,b}-
55	## stdout: -A- -b-
56
57	#### double expansion with simple var -- bash bug
58	# bash is inconsistent with the above
59	a=A
60	echo {$a,b}_{c,d}
61	## stdout: A_c A_d b_c b_d
62	## BUG bash stdout: b_c b_d
63
64	#### double expansion with braced variable
65	# This fixes it
66	a=A
67	echo {${a},b}_{c,d}
68	## stdout: A_c A_d b_c b_d
69
70	#### double expansion with literal and simple var
71	a=A
72	echo {_$a,b}_{c,d}
73	## stdout: _A_c _A_d b_c b_d
74	## BUG bash stdout: _ _ b_c b_d
75
76	#### expansion with command sub
77	a=A
78	echo -{$(echo a),b}-
79	## stdout: -a- -b-
80
81	#### expansion with arith sub
82	a=A
83	echo -{$((1 + 2)),b}-
84	## stdout: -3- -b-
85
86	#### double expansion with escaped literals
87	a=A
88	echo -{\$,\[,\]}-
89	## stdout: -$- -[- -]-
90
91	#### { in expansion
92	# bash and mksh treat this differently. bash treats the
93	# first { is a prefix. I think it's harder to read, and \{{a,b} should be
94	# required.
95	echo {{a,b}
96	## stdout: {{a,b}
97	## BUG bash/zsh stdout: {a {b
98
99	#### quoted { in expansion
100	echo \{{a,b}
101	## stdout: {a {b
102
103	#### Empty expansion
104	echo a{X,,Y}b
105	## stdout: aXb ab aYb
106
107	#### Empty alternative
108	# zsh and mksh don't do word elision, probably because they do brace expansion
109	# AFTER variable substitution.
110	argv.py {X,,Y,}
111	## stdout: ['X', 'Y']
112	## OK mksh/zsh stdout: ['X', '', 'Y', '']
113	## status: 0
114
115	#### Empty alternative with empty string suffix
116	# zsh and mksh don't do word elision, probably because they do brace expansion
117	# AFTER variable substitution.
118	argv.py {X,,Y,}''
119	## stdout: ['X', '', 'Y', '']
120	## status: 0
121
122	#### nested brace expansion
123	echo -{A,={a,b}=,B}-
124	## stdout: -A- -=a=- -=b=- -B-
125
126	#### triple nested brace expansion
127	echo -{A,={a,.{x,y}.,b}=,B}-
128	## stdout: -A- -=a=- -=.x.=- -=.y.=- -=b=- -B-
129
130	#### nested and double brace expansion
131	echo -{A,={a,b}{c,d}=,B}-
132	## stdout: -A- -=ac=- -=ad=- -=bc=- -=bd=- -B-
133
134	#### expansion on RHS of assignment
135	# I think bash's behavior is more consistent. No splitting either.
136	v={X,Y}
137	echo $v
138	## stdout: {X,Y}
139	## BUG mksh stdout: X Y
140
141	#### no expansion with RHS assignment
142	{v,x}=X
143	## status: 127
144	## stdout-json: ""
145	## OK zsh status: 1
146
147	#### Tilde expansion
148	HOME=/home/foo
149	echo ~
150	HOME=/home/bar
151	echo ~
152	## stdout-json: "/home/foo\n/home/bar\n"
153
154	#### Tilde expansion with brace expansion
155	# The brace expansion happens FIRST. After that, the second token has tilde
156	# FIRST, so it gets expanded. The first token has an unexpanded tilde, because
157	# it's not in the leading position.
158	# NOTE: mksh gives different behavior! So it probably doesn't matter that
159	# much...
160	HOME=/home/bob
161	echo {foo~,~}/bar
162	## stdout: foo~/bar /home/bob/bar
163	## OK mksh stdout: foo~/bar ~/bar
164
165	#### Two kinds of tilde expansion
166	# ~/foo and ~bar
167	HOME=/home/bob
168	echo ~{/src,root}
169	## stdout: /home/bob/src /root
170	## OK mksh stdout: ~/src ~root
171
172	#### Tilde expansion come before var expansion
173	HOME=/home/bob
174	foo=~
175	echo $foo
176	foo='~'
177	echo $foo
178	# In the second instance, we expand into a literal ~, and since var expansion
179	# comes after tilde expansion, it is NOT tried again.
180	## stdout-json: "/home/bob\n~\n"
181
182	#### Number range expansion
183	echo -{1..8..3}-
184	## stdout: -1- -4- -7-
185	## N-I mksh stdout: -{1..8..3}-
186
187	#### Ascending number range expansion with negative step
188	echo -{1..8..-3}-
189	## stdout: -1- -4- -7-
190	## OK zsh stdout: -7- -4- -1-
191	## N-I mksh stdout: -{1..8..-3}-
192
193	#### Descending number range expansion
194	echo -{8..1..3}-
195	## stdout: -8- -5- -2-
196	## N-I mksh stdout: -{8..1..3}-
197
198	#### Descending number range expansion with negative step
199	echo -{8..1..-3}-
200	## stdout: -8- -5- -2-
201	## OK zsh stdout: -2- -5- -8-
202	## N-I mksh stdout: -{8..1..-3}-
203
204	#### Char range expansion
205	echo -{a..e}-
206	## stdout: -a- -b- -c- -d- -e-
207	## N-I mksh stdout: -{a..e}-
208
209	#### Char range expansion with step
210	echo -{a..e..2}- -{a..e..-2}-
211	## stdout: -a- -c- -e- -a- -c- -e-
212	## N-I mksh/zsh stdout: -{a..e..2}- -{a..e..-2}-
213
214	#### Descending char range expansion
215	echo -{e..a..2}- -{e..a..-2}-
216	## stdout: -e- -c- -a- -e- -c- -a-
217	## N-I mksh/zsh stdout: -{e..a..2}- -{e..a..-2}-
218
219	#### Fixed width number range expansion
220	echo -{01..03}-
221	## stdout: -01- -02- -03-
222	## N-I mksh stdout: -{01..03}-
223
224	#### Inconsistent fixed width number range expansion
225	# zsh uses the first one, bash uses the max width?
226	echo -{01..003}-
227	## stdout: -001- -002- -003-
228	## OK zsh stdout: -01- -02- -03-
229	## N-I mksh stdout: -{01..003}-
230
231	#### Inconsistent fixed width number range expansion
232	# zsh uses the first width, bash uses the max width?
233	echo -{01..3}-
234	## stdout: -01- -02- -03-
235	## N-I mksh stdout: -{01..3}-
236
237	#### Side effect in expansion
238	# bash is the only one that does it first. I guess since this is
239	# non-POSIX anyway, follow bash?
240	i=0
241	echo {a,b,c}-$((i++))
242	## stdout: a-0 b-1 c-2
243	## OK mksh/zsh stdout: a-0 b-0 c-0