1 | ## compare_shells: bash dash mksh
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2 | ## oils_failures_allowed: 8
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3 |
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4 | # NOTE on bash bug: After setting IFS to array, it never splits anymore? Even
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5 | # if you assign IFS again.
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6 |
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7 | #### IFS is scoped
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8 | IFS=b
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9 | word=abcd
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10 | f() { local IFS=c; argv.py $word; }
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11 | f
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12 | argv.py $word
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13 | ## stdout-json: "['ab', 'd']\n['a', 'cd']\n"
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14 |
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15 | #### Tilde sub is not split, but var sub is
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16 | HOME="foo bar"
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17 | argv.py ~
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18 | argv.py $HOME
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19 | ## stdout-json: "['foo bar']\n['foo', 'bar']\n"
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20 |
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21 | #### Word splitting
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22 | a="1 2"
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23 | b="3 4"
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24 | argv.py $a"$b"
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25 | ## stdout-json: "['1', '23 4']\n"
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26 |
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27 | #### Word splitting 2
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28 | a="1 2"
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29 | b="3 4"
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30 | c="5 6"
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31 | d="7 8"
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32 | argv.py $a"$b"$c"$d"
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33 | ## stdout-json: "['1', '23 45', '67 8']\n"
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34 |
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35 | # Has tests on differences between $* "$*" $@ "$@"
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36 | # http://stackoverflow.com/questions/448407/bash-script-to-receive-and-repass-quoted-parameters
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37 |
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38 | #### $*
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39 | fun() { argv.py -$*-; }
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40 | fun "a 1" "b 2" "c 3"
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41 | ## stdout: ['-a', '1', 'b', '2', 'c', '3-']
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42 |
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43 | #### "$*"
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44 | fun() { argv.py "-$*-"; }
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45 | fun "a 1" "b 2" "c 3"
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46 | ## stdout: ['-a 1 b 2 c 3-']
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47 |
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48 | #### $@
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49 | # How does this differ from $* ? I don't think it does.
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50 | fun() { argv.py -$@-; }
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51 | fun "a 1" "b 2" "c 3"
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52 | ## stdout: ['-a', '1', 'b', '2', 'c', '3-']
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53 |
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54 | #### "$@"
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55 | fun() { argv.py "-$@-"; }
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56 | fun "a 1" "b 2" "c 3"
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57 | ## stdout: ['-a 1', 'b 2', 'c 3-']
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58 |
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59 | #### empty argv
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60 | argv.py 1 "$@" 2 $@ 3 "$*" 4 $* 5
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61 | ## stdout: ['1', '2', '3', '', '4', '5']
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62 |
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63 | #### Word elision with space
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64 | s1=' '
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65 | argv.py $s1
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66 | ## stdout: []
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67 |
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68 | #### Word elision with non-whitespace IFS
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69 | # Treated differently than the default IFS. What is the rule here?
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70 | IFS='_'
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71 | char='_'
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72 | space=' '
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73 | empty=''
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74 | argv.py $char
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75 | argv.py $space
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76 | argv.py $empty
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77 | ## STDOUT:
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78 | ['']
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79 | [' ']
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80 | []
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81 | ## END
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82 |
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83 | #### Leading/trailing word elision with non-whitespace IFS
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84 | # This behavior is weird.
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85 | IFS=_
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86 | s1='_a_b_'
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87 | argv.py $s1
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88 | ## stdout: ['', 'a', 'b']
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89 |
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90 | #### Leading ' ' vs leading ' _ '
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91 | # This behavior is weird, but all shells agree.
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92 | IFS='_ '
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93 | s1='_ a b _ '
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94 | s2=' a b _ '
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95 | argv.py $s1
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96 | argv.py $s2
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97 | ## STDOUT:
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98 | ['', 'a', 'b']
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99 | ['a', 'b']
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100 | ## END
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101 |
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102 | #### Multiple non-whitespace IFS chars.
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103 | IFS=_-
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104 | s1='a__b---c_d'
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105 | argv.py $s1
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106 | ## stdout: ['a', '', 'b', '', '', 'c', 'd']
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107 |
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108 | #### IFS with whitespace and non-whitepace.
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109 | # NOTE: Three delimiters means two empty words in the middle. No elision.
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110 | IFS='_ '
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111 | s1='a_b _ _ _ c _d e'
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112 | argv.py $s1
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113 | ## stdout: ['a', 'b', '', '', 'c', 'd', 'e']
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114 |
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115 | #### empty $@ and $* is elided
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116 | fun() { argv.py 1 $@ $* 2; }
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117 | fun
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118 | ## stdout: ['1', '2']
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119 |
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120 | #### unquoted empty arg is elided
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121 | empty=""
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122 | argv.py 1 $empty 2
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123 | ## stdout: ['1', '2']
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124 |
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125 | #### unquoted whitespace arg is elided
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126 | space=" "
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127 | argv.py 1 $space 2
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128 | ## stdout: ['1', '2']
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129 |
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130 | #### empty literals are not elided
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131 | space=" "
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132 | argv.py 1 $space"" 2
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133 | ## stdout: ['1', '', '2']
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134 |
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135 | #### no splitting when IFS is empty
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136 | IFS=""
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137 | foo="a b"
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138 | argv.py $foo
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139 | ## stdout: ['a b']
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140 |
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141 | #### default value can yield multiple words
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142 | argv.py 1 ${undefined:-"2 3" "4 5"} 6
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143 | ## stdout: ['1', '2 3', '4 5', '6']
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144 |
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145 | #### default value can yield multiple words with part joining
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146 | argv.py 1${undefined:-"2 3" "4 5"}6
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147 | ## stdout: ['12 3', '4 56']
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148 |
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149 | #### default value with unquoted IFS char
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150 | IFS=_
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151 | argv.py 1${undefined:-"2_3"x_x"4_5"}6
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152 | ## stdout: ['12_3x', 'x4_56']
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153 |
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154 | #### IFS empty doesn't do splitting
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155 | IFS=''
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156 | x=$(echo -e ' a b\tc\n')
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157 | argv.py $x
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158 | ## STDOUT:
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159 | [' a b\tc']
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160 | ## END
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161 | ## N-I dash STDOUT:
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162 | ['-e a b\tc']
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163 | ## END
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164 |
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165 |
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166 | #### IFS unset behaves like $' \t\n'
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167 | unset IFS
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168 | x=$(echo -e ' a b\tc\n')
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169 | argv.py $x
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170 | ## STDOUT:
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171 | ['a', 'b', 'c']
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172 | ## END
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173 | ## N-I dash STDOUT:
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174 | ['-e', 'a', 'b', 'c']
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175 | ## END
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176 |
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177 | #### IFS='\'
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178 | # NOTE: OSH fails this because of double backslash escaping issue!
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179 | IFS='\'
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180 | s='a\b'
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181 | argv.py $s
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182 | ## STDOUT:
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183 | ['a', 'b']
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184 | ## END
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185 |
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186 | #### IFS='\ '
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187 | # NOTE: OSH fails this because of double backslash escaping issue!
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188 | # When IFS is \, then you're no longer using backslash escaping.
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189 | IFS='\ '
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190 | s='a\b \\ c d\'
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191 | argv.py $s
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192 | ## STDOUT:
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193 | ['a', 'b', '', 'c', 'd']
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194 | ## END
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195 |
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196 | #### IFS characters are glob metacharacters
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197 | IFS='* '
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198 | s='a*b c'
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199 | argv.py $s
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200 |
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201 | IFS='?'
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202 | s='?x?y?z?'
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203 | argv.py $s
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204 |
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205 | IFS='['
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206 | s='[x[y[z['
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207 | argv.py $s
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208 | ## STDOUT:
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209 | ['a', 'b', 'c']
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210 | ['', 'x', 'y', 'z']
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211 | ['', 'x', 'y', 'z']
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212 | ## END
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213 |
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214 | #### Trailing space
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215 | argv.py 'Xec ho '
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216 | argv.py X'ec ho '
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217 | argv.py X"ec ho "
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218 | ## STDOUT:
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219 | ['Xec ho ']
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220 | ['Xec ho ']
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221 | ['Xec ho ']
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222 | ## END
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223 |
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224 | #### Empty IFS (regression for bug)
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225 | IFS=
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226 | echo ["$*"]
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227 | set a b c
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228 | echo ["$*"]
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229 | ## STDOUT:
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230 | []
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231 | [abc]
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232 | ## END
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233 |
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234 | #### Unset IFS (regression for bug)
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235 | set a b c
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236 | unset IFS
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237 | echo ["$*"]
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238 | ## STDOUT:
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239 | [a b c]
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240 | ## END
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241 |
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242 | #### IFS=o (regression for bug)
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243 | IFS=o
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244 | echo hi
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245 | ## STDOUT:
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246 | hi
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247 | ## END
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248 |
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249 | #### IFS and joining arrays
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250 | IFS=:
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251 | set -- x 'y z'
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252 | argv.py "$@"
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253 | argv.py $@
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254 | argv.py "$*"
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255 | argv.py $*
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256 | ## STDOUT:
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257 | ['x', 'y z']
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258 | ['x', 'y z']
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259 | ['x:y z']
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260 | ['x', 'y z']
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261 | ## END
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262 |
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263 | #### IFS and joining arrays by assignments
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264 | IFS=:
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265 | set -- x 'y z'
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266 |
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267 | s="$@"
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268 | argv.py "$s"
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269 |
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270 | s=$@
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271 | argv.py "$s"
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272 |
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273 | s"$*"
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274 | argv.py "$s"
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275 |
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276 | s=$*
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277 | argv.py "$s"
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278 |
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279 | # bash and mksh agree, but this doesn't really make sense to me.
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280 | # In OSH, "$@" is the only real array, so that's why it behaves differently.
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281 |
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282 | ## STDOUT:
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283 | ['x y z']
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284 | ['x y z']
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285 | ['x y z']
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286 | ['x:y z']
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287 | ## END
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288 | ## OK dash STDOUT:
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289 | ['x:y z']
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290 | ['x:y z']
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291 | ['x:y z']
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292 | ['x:y z']
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293 | ## END
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294 |
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295 |
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296 | # TODO:
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297 | # - unquoted args of whitespace are not elided (when IFS = null)
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298 | # - empty quoted args are kept
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299 | #
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300 | # - $* $@ with empty IFS
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301 | # - $* $@ with custom IFS
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302 | #
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303 | # - no splitting when IFS is empty
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304 | # - word splitting removes leading and trailing whitespace
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305 |
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306 | # TODO: test framework needs common setup
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307 |
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308 | # Test IFS and $@ $* on all these
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309 | #### TODO
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310 | empty=""
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311 | space=" "
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312 | AB="A B"
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313 | X="X"
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314 | Yspaces=" Y "
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315 |
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316 |
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317 | #### IFS='' with $@ and $* (bug #627)
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318 | set -- a 'b c'
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319 | IFS=''
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320 | argv.py at $@
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321 | argv.py star $*
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322 |
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323 | # zsh agrees
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324 | ## STDOUT:
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325 | ['at', 'a', 'b c']
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326 | ['star', 'a', 'b c']
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327 | ## END
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328 | ## BUG ash STDOUT:
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329 | ['at', 'ab c']
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330 | ['star', 'ab c']
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331 | ## END
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332 |
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333 | #### IFS='' with $@ and $* and printf (bug #627)
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334 | set -- a 'b c'
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335 | IFS=''
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336 | printf '[%s]\n' $@
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337 | printf '[%s]\n' $*
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338 | ## STDOUT:
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339 | [a]
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340 | [b c]
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341 | [a]
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342 | [b c]
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343 | ## END
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344 | ## BUG ash STDOUT:
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345 | [ab c]
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346 | [ab c]
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347 | ## END
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348 |
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349 | #### IFS='' with ${a[@]} and ${a[*]} (bug #627)
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350 | myarray=(a 'b c')
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351 | IFS=''
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352 | argv.py at ${myarray[@]}
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353 | argv.py star ${myarray[*]}
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354 |
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355 | ## STDOUT:
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356 | ['at', 'a', 'b c']
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357 | ['star', 'a', 'b c']
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358 | ## END
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359 | ## N-I dash/ash status: 2
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360 | ## N-I dash/ash stdout-json: ""
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361 |
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362 | #### Bug #628 split on : with : in literal word
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363 | IFS=':'
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364 | word='a:'
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365 | argv.py ${word}:b
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366 | argv.py ${word}:
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367 |
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368 | echo ---
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369 |
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370 | # Same thing happens for 'z'
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371 | IFS='z'
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372 | word='az'
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373 | argv.py ${word}zb
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374 | argv.py ${word}z
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375 | ## STDOUT:
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376 | ['a', ':b']
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377 | ['a', ':']
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378 | ---
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379 | ['a', 'zb']
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380 | ['a', 'z']
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381 | ## END
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382 |
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383 | #### Bug #698, similar crash
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384 | var='\'
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385 | set -f
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386 | echo $var
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387 | ## STDOUT:
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388 | \
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389 | ## END
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390 |
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391 | #### Bug #1664, \\ with noglob
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392 |
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393 | # Note that we're not changing IFS
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394 |
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395 | argv.py [\\]_
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396 | argv.py "[\\]_"
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397 |
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398 | # TODO: no difference observed here, go back to original bug
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399 |
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400 | #argv.py [\\_
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401 | #argv.py "[\\_"
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402 |
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403 | echo noglob
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404 |
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405 | # repeat cases with -f, noglob
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406 | set -f
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407 |
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408 | argv.py [\\]_
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409 | argv.py "[\\]_"
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410 |
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411 | #argv.py [\\_
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412 | #argv.py "[\\_"
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413 |
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414 | ## STDOUT:
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415 | ['[\\]_']
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416 | ['[\\]_']
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417 | noglob
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418 | ['[\\]_']
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419 | ['[\\]_']
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420 | ## END
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421 |
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