1	#!/usr/bin/env bash
2
3	#### Remove const suffix
4	v=abcd
5	echo ${v%d} ${v%%cd}
6	## stdout: abc ab
7
8	#### Remove const prefix
9	v=abcd
10	echo ${v#a} ${v##ab}
11	## stdout: bcd cd
12
13	#### Remove const suffix is vectorized on user array
14	a=(1a 2a 3a)
15	argv.py ${a[@]%a}
16	## stdout: ['1', '2', '3']
17	## status: 0
18	## N-I dash/mksh stdout-json: ""
19	## N-I dash status: 2
20	## N-I mksh status: 1
21
22	#### Remove const suffix is vectorized on $@ array
23	set -- 1a 2a 3a
24	argv.py ${@%a}
25	## stdout: ['1', '2', '3']
26	## status: 0
27	## N-I dash stdout: ['1a', '2a', '3']
28	## N-I dash status: 0
29	## N-I mksh stdout-json: ""
30	## N-I mksh status: 1
31
32	#### Remove const suffix from undefined
33	echo ${undef%suffix}
34	## stdout:
35
36	#### Remove shortest glob suffix
37	v=aabbccdd
38	echo ${v%c*}
39	## stdout: aabbc
40
41	#### Remove longest glob suffix
42	v=aabbccdd
43	echo ${v%%c*}
44	## stdout: aabb
45
46	#### Remove shortest glob prefix
47	v=aabbccdd
48	echo ${v#*b}
49	## stdout: bccdd
50
51	#### Remove longest glob prefix
52	v=aabbccdd
53	echo ${v##*b}
54	## stdout: ccdd
55
56	#### Strip char class
57	v=abc
58	echo ${v%[[:alpha:]]}
59	## stdout: ab
60	## N-I mksh stdout: abc
61
62	#### Strip unicode prefix
63	# NOTE: LANG is set to utf-8. Problem: there is no way to represent the
64	# invalid character! Instead of stdout-json, how about stdout-bytes?
65	v='μ-'
66	echo ${v#?} # ? is a glob that stands for one character
67	## stdout: -
68	## BUG dash/mksh stdout-repr: '\xbc-\n'
69	## BUG zsh stdout-repr: '\n'
70
71	#### Bug fix: Test that you can remove everything with glob
72	s='--x--'
73	argv.py "${s%%-*}" "${s%-*}" "${s#*-}" "${s##*-}"
74	## STDOUT:
75	['', '--x-', '-x--', '']
76	## END
77
78	#### Test that you can remove everything with const
79	s='abcd'
80	argv.py "${s%%abcd}" "${s%abcd}" "${s#abcd}" "${s##abcd}"
81	# failure case:
82	argv.py "${s%%abcde}" "${s%abcde}" "${s#abcde}" "${s##abcde}"
83	## STDOUT:
84	['', '', '', '']
85	['abcd', 'abcd', 'abcd', 'abcd']
86	## END
87
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89