1	#!/bin/bash
2
3	### [[ glob matching, [[ has no glob expansion
4	[[ foo.py == *.py ]] && echo true
5	[[ foo.p == *.py ]] || echo false
6	# stdout-json: "true\nfalse\n"
7
8	### [[ glob matching with escapes
9	[[ 'foo.*' == *."*" ]] && echo true
10	# note that the pattern arg to fnmatch should be '*.\*'
11	# stdout: true
12
13	### equality
14	[[ '*.py' == '*.py' ]] && echo true
15	[[ foo.py == '*.py' ]] || echo false
16	# stdout-json: "true\nfalse\n"
17
18	### [[ glob matching with unquoted var
19	pat=*.py
20	[[ foo.py == $pat ]] && echo true
21	[[ foo.p == $pat ]] || echo false
22	# stdout-json: "true\nfalse\n"
23
24	### [[ regex matching
25	# mksh doesn't have this syntax of regex matching. I guess it comes from perl?
26	regex='.*\.py'
27	[[ foo.py =~ $regex ]] && echo true
28	[[ foo.p =~ $regex ]] || echo false
29	# stdout-json: "true\nfalse\n"
30	# N-I mksh stdout-json: ""
31	# N-I mksh status: 1
32
33	### [[ regex syntax error
34	# hm, it doesn't show any error, but it exits 2.
35	[[ foo.py =~ * ]] && echo true
36	# status: 2
37	# N-I mksh status: 1
38
39	### [[ has no word splitting
40	var='one two'
41	[[ 'one two' == $var ]] && echo true
42	# stdout: true
43
44	### [[ has quote joining
45	var='one two'
46	[[ 'one 'tw"o" == $var ]] && echo true
47	# stdout: true
48
49	### [[ empty string is false
50	[[ 'a' ]] && echo true
51	[[ '' ]] || echo false
52	# stdout-json: "true\nfalse\n"
53
54	### && chain
55	[[ t && t && '' ]] || echo false
56	# stdout: false
57
58	### || chain
59	[[ '' || '' || t ]] && echo true
60	# stdout: true
61
62	### [[ compound expressions
63	# Notes on whitespace:
64	# - 1 and == need space seprating them, but ! and ( don't.
65	# - [[ needs whitesapce after it, but ]] doesn't need whitespace before it!
66	[[ ''||!(1 == 2)&&(2 == 2)]] && echo true
67	# stdout: true
68
69	# NOTE on the two cases below. We're comparing
70	# (a || b) && c vs. a || (b && c)
71	#
72	# a = true, b = false, c = false is an example where they are different.
73	# && and || have precedence inside
74
75	### precedence of && and || inside [[
76	[[ True || '' && '' ]] && echo true
77	# stdout: true
78
79	### precedence of && and || in a command context
80	if test True || test '' && test ''; then
81	echo YES
82	else
83	echo "NO precedence"
84	fi
85	# stdout: NO precedence
86
87	# http://tldp.org/LDP/abs/html/testconstructs.html#DBLBRACKETS
88
89	### Octal literals with -eq
90	decimal=15
91	octal=017 # = 15 (decimal)
92	[[ $decimal -eq $octal ]] && echo true
93	[[ $decimal -eq ZZZ$octal ]] || echo false
94	# stdout-json: "true\nfalse\n"
95	# N-I mksh stdout: false
96	# mksh doesn't implement this syntax for literals.
97
98	### Hex literals with -eq
99	decimal=15
100	hex=0x0f # = 15 (decimal)
101	[[ $decimal -eq $hex ]] && echo true
102	[[ $decimal -eq ZZZ$hex ]] || echo false
103	# stdout-json: "true\nfalse\n"
104	# N-I mksh stdout: false
105
106	# TODO: Add tests for this
107	# https://www.gnu.org/software/bash/manual/bash.html#Bash-Conditional-Expressions
108	# When used with [[, the ‘<’ and ‘>’ operators sort lexicographically using the current locale. The test command uses ASCII ordering.
109
110	### > on strings
111	# NOTE: < doesn't need space, even though == does? That's silly.
112	[[ b>a ]] && echo true
113	[[ b<a ]] || echo false
114	# stdout-json: "true\nfalse\n"
115
116	### != on strings
117	# NOTE: b!=a does NOT work
118	[[ b != a ]] && echo true
119	[[ a != a ]] || echo false
120	# stdout-json: "true\nfalse\n"
121
122	### -eq on strings
123	# This is lame behavior: it does a conversion to 0 first for any string
124	[[ a -eq a ]] && echo true
125	[[ a -eq b ]] && echo true
126	# stdout-json: "true\ntrue\n"
127	# OK bash/mksh stdout-json: "true\ntrue\n"
128
129	### [[ compare with literal -f
130	var=-f
131	[[ $var == -f ]] && echo true
132	[[ '-f' == $var ]] && echo true
133	# stdout-json: "true\ntrue\n"
134
135	### [ compare with literal -f
136	# Hm this is the same
137	var=-f
138	[ $var == -f ] && echo true
139	[ '-f' == $var ] && echo true
140	# stdout-json: "true\ntrue\n"
141
142	### [[ with op variable
143	# Parse error -- parsed BEFORE evaluation of vars
144	op='=='
145	[[ a $op a ]] && echo true
146	[[ a $op b ]] || echo false
147	# status: 2
148	# OK mksh status: 1
149
150	### [ with op variable
151	# OK -- parsed AFTER evaluation of vars
152	op='=='
153	[ a $op a ] && echo true
154	[ a $op b ] || echo false
155	# status: 0
156	# stdout-json: "true\nfalse\n"
157
158	### [[ with unquoted empty var
159	empty=''
160	[[ $empty == '' ]] && echo true
161	# stdout: true
162
163	### [ with unquoted empty var
164	empty=''
165	[ $empty == '' ] && echo true
166	# status: 2
167
168	### [[ at runtime doesn't work
169	dbracket=[[
170	$dbracket foo == foo ]]
171	# status: 127
172
173	### [[ with env prefix doesn't work
174	FOO=bar [[ foo == foo ]]
175	# status: 127
176
177	### [[ over multiple lines is OK
178	# Hm it seems you can't split anywhere?
179	[[ foo == foo
180	&& bar == bar
181	]] && echo true
182	# status: 0
183	# stdout-json: "true\n"
184
185	### Argument that looks like a command word operator
186	[[ -f -f ]] || echo false
187	[[ -f == ]] || echo false
188	# stdout-json: "false\nfalse\n"
189
190	### Argument that looks like a real operator
191	[[ -f < ]]
192	# status: 2
193	# OK mksh status: 1
194
195	### Does user array equal "$@" ?
196	# Oh it coerces both to a string. Lame.
197	# I think it disobeys "${a[@]}", and treats it like an UNQUOTED ${a[@]}.
198	a=(1 3 5)
199	b=(1 2 3)
200	set -- 1 3 5
201	[[ "$@" = "${a[@]}" ]] && echo true
202	[[ "$@" = "${b[@]}" ]] || echo false
203	# stdout-json: "true\nfalse\n"
204
205	### Array coerces to string
206	a=(1 3 5)
207	[[ '1 3 5' = "${a[@]}" ]] && echo true
208	[[ '1 3 4' = "${a[@]}" ]] || echo false
209	# stdout-json: "true\nfalse\n"
210
211	### Quotes don't matter in comparison
212	[[ '3' = 3 ]] && echo true
213	[[ '3' -eq 3 ]] && echo true
214	# stdout-json: "true\ntrue\n"