1	#!/bin/bash
2
3	# NOTE on bash bug: After setting IFS to array, it never splits anymore? Even
4	# if you assign IFS again.
5
6	### IFS is scoped
7	IFS=b
8	word=abcd
9	f() { local IFS=c; argv.py $word; }
10	f
11	argv.py $word
12	# stdout-json: "['ab', 'd']\n['a', 'cd']\n"
13
14	### Tilde sub is not split, but var sub is
15	HOME="foo bar"
16	argv.py ~
17	argv.py $HOME
18	# stdout-json: "['foo bar']\n['foo', 'bar']\n"
19
20	### Word splitting
21	a="1 2"
22	b="3 4"
23	argv.py $a"$b"
24	# stdout-json: "['1', '23 4']\n"
25
26	### Word splitting 2
27	a="1 2"
28	b="3 4"
29	c="5 6"
30	d="7 8"
31	argv.py $a"$b"$c"$d"
32	# stdout-json: "['1', '23 45', '67 8']\n"
33
34	# Has tests on differences between $* "$*" $@ "$@"
35	# http://stackoverflow.com/questions/448407/bash-script-to-receive-and-repass-quoted-parameters
36
37	### $*
38	func() { argv.py -$*-; }
39	func "a 1" "b 2" "c 3"
40	# stdout: ['-a', '1', 'b', '2', 'c', '3-']
41
42	### "$*"
43	func() { argv.py "-$*-"; }
44	func "a 1" "b 2" "c 3"
45	# stdout: ['-a 1 b 2 c 3-']
46
47	### $@
48	# How does this differ from $* ? I don't think it does.
49	func() { argv.py -$@-; }
50	func "a 1" "b 2" "c 3"
51	# stdout: ['-a', '1', 'b', '2', 'c', '3-']
52
53	### "$@"
54	func() { argv.py "-$@-"; }
55	func "a 1" "b 2" "c 3"
56	# stdout: ['-a 1', 'b 2', 'c 3-']
57
58	### empty argv
59	argv.py 1 "$@" 2 $@ 3 "$*" 4 $* 5
60	# stdout: ['1', '2', '3', '', '4', '5']
61
62	### Word elision with space
63	s1=' '
64	argv.py $s1
65	# stdout: []
66
67	### Word elision with non-whitespace IFS
68	# Treated differently than the default IFS. What is the rule here?
69	IFS=_
70	s1='_'
71	argv.py $s1
72	# stdout: ['']
73
74	### Leading/trailing word elision with non-whitespace IFS
75	# This behavior is weird.
76	IFS=_
77	s1='_a_b_'
78	argv.py $s1
79	# stdout: ['', 'a', 'b']
80
81	### Multiple non-whitespace IFS chars.
82	IFS=_-
83	s1='a__b---c_d'
84	argv.py $s1
85	# stdout: ['a', '', 'b', '', '', 'c', 'd']
86
87	### IFS with whitespace and non-whitepace.
88	# NOTE: Three delimiters means two empty words in the middle. No elision.
89	IFS='_ '
90	s1='a_b _ _ _ c _d e'
91	argv.py $s1
92	# stdout: ['a', 'b', '', '', 'c', 'd', 'e']
93
94	### empty $@ and $* is elided
95	func() { argv.py 1 $@ $* 2; }
96	func
97	# stdout: ['1', '2']
98
99	### unquoted empty arg is elided
100	empty=""
101	argv.py 1 $empty 2
102	# stdout: ['1', '2']
103
104	### unquoted whitespace arg is elided
105	space=" "
106	argv.py 1 $space 2
107	# stdout: ['1', '2']
108
109	### empty literals are not elided
110	space=" "
111	argv.py 1 $space"" 2
112	# stdout: ['1', '', '2']
113
114	### no splitting when IFS is empty
115	IFS=""
116	foo="a b"
117	argv.py $foo
118	# stdout: ['a b']
119
120	### default value can yield multiple words
121	argv.py 1 ${undefined:-"2 3" "4 5"} 6
122	# stdout: ['1', '2 3', '4 5', '6']
123
124	### default value can yield multiple words with part joining
125	argv.py 1${undefined:-"2 3" "4 5"}6
126	# stdout: ['12 3', '4 56']
127
128	### default value with unquoted IFS char
129	IFS=_
130	argv.py 1${undefined:-"2_3"x_x"4_5"}6
131	# stdout: ['12_3x', 'x4_56']
132
133
134	# TODO:
135	# - unquoted args of whitespace are not elided (when IFS = null)
136	# - empty quoted args are kept
137	# - Test ${@:1} and so forth?
138	#
139	# - $* $@ with empty IFS
140	# - $* $@ with custom IFS
141	#
142	# - no splitting when IFS is empty
143	# - word splitting removes leading and trailing whitespace
144
145	# TODO: test framework needs common setup
146
147	# Test IFS and $@ $* on all these
148	### TODO
149	empty=""
150	space=" "
151	AB="A B"
152	X="X"
153	Yspaces=" Y "