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	### Word elision with space
59	s1=' '
60	argv.py $s1
61	# stdout: []
62
63	### Word elision with non-whitespace IFS
64	# Treated differently than the default IFS. What is the rule here?
65	IFS=_
66	s1='_'
67	argv.py $s1
68	# stdout: ['']
69
70	### empty $@ and $* is elided
71	func() { argv.py 1 $@ $* 2; }
72	func
73	# stdout: ['1', '2']
74
75	### unquoted empty arg is elided
76	empty=""
77	argv.py 1 $empty 2
78	# stdout: ['1', '2']
79
80	### unquoted whitespace arg is elided
81	space=" "
82	argv.py 1 $space 2
83	# stdout: ['1', '2']
84
85	### empty literals are not elided
86	space=" "
87	argv.py 1 $space"" 2
88	# stdout: ['1', '', '2']
89
90	### no splitting when IFS is empty
91	IFS=""
92	foo="a b"
93	argv.py $foo
94	# stdout: ['a b']
95
96	### default value can yield multiple words
97	argv.py 1 ${undefined:-"2 3" "4 5"} 6
98	# stdout: ['1', '2 3', '4 5', '6']
99
100	### default value can yield multiple words with part joining
101	argv.py 1${undefined:-"2 3" "4 5"}6
102	# stdout: ['12 3', '4 56']
103
104	### default value with unquoted IFS char
105	IFS=_
106	argv.py 1${undefined:-"2_3"x_x"4_5"}6
107	# stdout: ['12_3x', 'x4_56']
108
109
110	# TODO:
111	# - unquoted args of whitespace are not elided (when IFS = null)
112	# - empty quoted args are kept
113	# - Test ${@:1} and so forth?
114	#
115	# - $* $@ with empty IFS
116	# - $* $@ with custom IFS
117	#
118	# - no splitting when IFS is empty
119	# - word splitting removes leading and trailing whitespace
120
121	# TODO: test framework needs common setup
122
123	# Test IFS and $@ $* on all these
124	### TODO
125	empty=""
126	space=" "
127	AB="A B"
128	X="X"
129	Yspaces=" Y "