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