1	#!/usr/bin/env bash
2	#
3	# Tests for the args in:
4	#
5	# ${foo:-}
6	#
7	# I think the weird single quote behavior is a bug, but everyone agrees. It's
8	# a consequence of quote removal.
9	#
10	# WEIRD: single quoted default, inside double quotes. Oh I guess this is
11	# because double quotes don't treat single quotes as special?
12	#
13	# OK here is the issue. If we have ${} bare, then the default is parsed as
14	# LexState.OUTER. If we have "${}", then it's parsed as LexState.DQ. That
15	# makes sense I guess. Vim's syntax highlighting is throwing me off.
16
17	#### "${empty:-}"
18	empty=
19	argv.py "${empty:-}"
20	## stdout: ['']
21
22	#### ${empty:-}
23	empty=
24	argv.py ${empty:-}
25	## stdout: []
26
27	#### array with empty values
28	declare -a A=('' x "" '')
29	argv.py "${A[@]}"
30	## stdout: ['', 'x', '', '']
31	## N-I dash stdout-json: ""
32	## N-I dash status: 2
33	## N-I mksh stdout-json: ""
34	## N-I mksh status: 1
35
36	#### substitution of IFS character, quoted and unquoted
37	IFS=:
38	s=:
39	argv.py $s
40	argv.py "$s"
41	## STDOUT:
42	['']
43	[':']
44	## END
45
46	#### :-
47	empty=''
48	argv.py ${empty:-a} ${Unset:-b}
49	## stdout: ['a', 'b']
50
51	#### -
52	empty=''
53	argv.py ${empty-a} ${Unset-b}
54	# empty one is still elided!
55	## stdout: ['b']
56
57	#### Inner single quotes
58	argv.py ${Unset:-'b'}
59	## stdout: ['b']
60
61	#### Inner single quotes, outer double quotes
62	# This is the WEIRD ONE. Single quotes appear outside. But all shells agree!
63	argv.py "${Unset:-'b'}"
64	## stdout: ["'b'"]
65
66	#### Inner double quotes
67	argv.py ${Unset:-"b"}
68	## stdout: ['b']
69
70	#### Inner double quotes, outer double quotes
71	argv.py "${Unset-"b"}"
72	## stdout: ['b']
73
74	#### Multiple words: no quotes
75	argv.py ${Unset:-a b c}
76	## stdout: ['a', 'b', 'c']
77
78	#### Multiple words: no outer quotes, inner single quotes
79	argv.py ${Unset:-'a b c'}
80	## stdout: ['a b c']
81
82	#### Multiple words: no outer quotes, inner double quotes
83	argv.py ${Unset:-"a b c"}
84	## stdout: ['a b c']
85
86	#### Multiple words: outer double quotes, no inner quotes
87	argv.py "${Unset:-a b c}"
88	## stdout: ['a b c']
89
90	#### Multiple words: outer double quotes, inner double quotes
91	argv.py "${Unset:-"a b c"}"
92	## stdout: ['a b c']
93
94	#### Multiple words: outer double quotes, inner single quotes
95	argv.py "${Unset:-'a b c'}"
96	# WEIRD ONE.
97	## stdout: ["'a b c'"]
98
99	#### Mixed inner quotes
100	argv.py ${Unset:-"a b" c}
101	## stdout: ['a b', 'c']
102
103	#### Mixed inner quotes with outer quotes
104	argv.py "${Unset:-"a b" c}"
105	## stdout: ['a b c']
106
107	#### part_value tree with multiple words
108	argv.py ${a:-${a:-"1 2" "3 4"}5 "6 7"}
109	## stdout: ['1 2', '3 45', '6 7']
110
111	#### part_value tree on RHS
112	v=${a:-${a:-"1 2" "3 4"}5 "6 7"}
113	argv.py "${v}"
114	## stdout: ['1 2 3 45 6 7']
115
116	#### Var with multiple words: no quotes
117	var='a b c'
118	argv.py ${Unset:-$var}
119	## stdout: ['a', 'b', 'c']
120
121	#### Multiple words: no outer quotes, inner single quotes
122	var='a b c'
123	argv.py ${Unset:-'$var'}
124	## stdout: ['$var']
125
126	#### Multiple words: no outer quotes, inner double quotes
127	var='a b c'
128	argv.py ${Unset:-"$var"}
129	## stdout: ['a b c']
130
131	#### Multiple words: outer double quotes, no inner quotes
132	var='a b c'
133	argv.py "${Unset:-$var}"
134	## stdout: ['a b c']
135
136	#### Multiple words: outer double quotes, inner double quotes
137	var='a b c'
138	argv.py "${Unset:-"$var"}"
139	## stdout: ['a b c']
140
141	#### Multiple words: outer double quotes, inner single quotes
142	# WEIRD ONE.
143	#
144	# I think I should just disallow any word with single quotes inside double
145	# quotes.
146	var='a b c'
147	argv.py "${Unset:-'$var'}"
148	## stdout: ["'a b c'"]
149
150	#### No outer quotes, Multiple internal quotes
151	# It's like a single command word. Parts are joined directly.
152	var='a b c'
153	argv.py ${Unset:-A$var " $var"D E F}
154	## stdout: ['Aa', 'b', 'c', ' a b cD', 'E', 'F']
155
156	#### Strip a string with single quotes, unquoted
157	foo="'a b c d'"
158	argv.py ${foo%d\'}
159	## stdout: ["'a", 'b', 'c']
160
161	#### Strip a string with single quotes, double quoted
162	foo="'a b c d'"
163	argv.py "${foo%d\'}"
164	## stdout: ["'a b c "]
165
166	#### The string to strip is space sensitive
167	foo='a b c d'
168	argv.py "${foo%c d}" "${foo%c d}"
169	## stdout: ['a b ', 'a b c d']
170
171	#### The string to strip can be single quoted, outer is unquoted
172	foo='a b c d'
173	argv.py ${foo%'c d'} ${foo%'c d'}
174	## stdout: ['a', 'b', 'a', 'b', 'c', 'd']
175
176	#### Strip a string with single quotes, double quoted, with unescaped '
177	# We're in a double quoted context, so we should be able to use a literal
178	# single quote. This is very much the case with :-.
179	foo="'a b c d'"
180	argv.py "${foo%d'}"
181	## stdout: ["'a b c "]
182	## BUG bash/mksh stdout-json: ""
183	## BUG bash status: 2
184	## BUG mksh status: 1
185
186	#### The string to strip can be single quoted, outer is double quoted
187	# This is an inconsistency in bash/mksh because '' are treated as literals in
188	# double quotes. The correct ways are above.
189	foo='a b c d'
190	argv.py "${foo%'c d'}" "${foo%'c d'}"
191	## stdout: ['a b c d', 'a b c d']
192	## BUG bash/mksh stdout: ['a b ', 'a b c d']
193
194	#### $'' allowed within VarSub arguments
195	# Odd behavior of bash/mksh: $'' is recognized but NOT ''!
196	x=abc
197	echo ${x%$'b'*}
198	echo "${x%$'b'*}" # git-prompt.sh relies on this
199	## STDOUT:
200	a
201	a
202	## END
203	## N-I dash STDOUT:
204	abc
205	abc
206	## END