| 1 | ## oils_failures_allowed: 0
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| 2 |
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| 3 | # Demonstrations for users. Could go in docs.
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| 4 |
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| 5 | #### GetValue scope and shopt --unset dynamic_scope
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| 6 | shopt --set parse_proc
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| 7 |
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| 8 | f() {
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| 9 | echo "sh x=$x"
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| 10 | }
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| 11 |
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| 12 | proc p {
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| 13 | echo "oil x=$x"
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| 14 | }
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| 15 |
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| 16 | demo() {
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| 17 | local x=dynamic
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| 18 | f
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| 19 | p
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| 20 |
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| 21 | shopt --unset dynamic_scope
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| 22 | f
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| 23 | }
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| 24 |
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| 25 | x=global
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| 26 | demo
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| 27 | echo x=$x
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| 28 |
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| 29 | ## STDOUT:
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| 30 | sh x=dynamic
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| 31 | oil x=global
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| 32 | sh x=global
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| 33 | x=global
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| 34 | ## END
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| 35 |
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| 36 |
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| 37 | #### SetValue scope and shopt --unset dynamic_scope
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| 38 | shopt --set parse_proc
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| 39 |
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| 40 | f() {
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| 41 | x=f
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| 42 | }
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| 43 |
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| 44 | proc p {
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| 45 | # x=p not allowed at parse time
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| 46 | declare x=p
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| 47 | }
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| 48 |
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| 49 | demo() {
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| 50 | local x=stack
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| 51 | echo x=$x
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| 52 | echo ---
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| 53 |
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| 54 | f
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| 55 | echo f x=$x
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| 56 |
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| 57 | x=stack
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| 58 | p
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| 59 | echo p x=$x
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| 60 |
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| 61 | shopt --unset dynamic_scope
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| 62 | x=stack
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| 63 | f
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| 64 | echo funset x=$x
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| 65 | }
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| 66 |
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| 67 | x=global
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| 68 | demo
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| 69 |
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| 70 | echo ---
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| 71 | echo x=$x
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| 72 |
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| 73 | ## STDOUT:
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| 74 | x=stack
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| 75 | ---
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| 76 | f x=f
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| 77 | p x=stack
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| 78 | funset x=stack
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| 79 | ---
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| 80 | x=global
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| 81 | ## END
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| 82 |
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| 83 | #### read scope
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| 84 | set -o errexit
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| 85 |
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| 86 | read-x() {
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| 87 | echo dynamic-scope | read x
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| 88 | }
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| 89 | demo() {
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| 90 | local x=42
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| 91 | echo x_before=$x
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| 92 | read-x
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| 93 | echo x_after=$x
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| 94 | }
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| 95 | demo
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| 96 | echo x=$x
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| 97 |
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| 98 | echo ---
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| 99 |
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| 100 | # Now 'read x' creates a local variable
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| 101 | shopt --unset dynamic_scope
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| 102 | demo
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| 103 | echo x=$x
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| 104 |
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| 105 | ## STDOUT:
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| 106 | x_before=42
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| 107 | x_after=dynamic-scope
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| 108 | x=
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| 109 | ---
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| 110 | x_before=42
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| 111 | x_after=42
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| 112 | x=
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| 113 | ## END
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| 114 |
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| 115 | #### printf -v x respects dynamic_scope
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| 116 | set -o errexit
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| 117 |
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| 118 | set-x() {
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| 119 | printf -v x "%s" dynamic-scope
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| 120 | }
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| 121 | demo() {
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| 122 | local x=42
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| 123 | echo x=$x
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| 124 | set-x
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| 125 | echo x=$x
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| 126 | }
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| 127 | demo
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| 128 | echo x=$x
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| 129 |
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| 130 | echo ---
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| 131 |
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| 132 | shopt --unset dynamic_scope # should NOT affect read
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| 133 | demo
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| 134 | echo x=$x
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| 135 |
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| 136 | ## STDOUT:
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| 137 | x=42
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| 138 | x=dynamic-scope
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| 139 | x=
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| 140 | ---
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| 141 | x=42
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| 142 | x=42
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| 143 | x=
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| 144 | ## END
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| 145 |
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| 146 | #### printf -v a[i] respects dynamic_scope
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| 147 | set -o errexit
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| 148 |
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| 149 | set-item() {
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| 150 | printf -v 'a[1]' "%s" dynamic-scope
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| 151 | }
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| 152 | demo() {
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| 153 | local -a a=(41 42 43)
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| 154 | echo "a[1]=${a[1]}"
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| 155 | set-item
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| 156 | echo "a[1]=${a[1]}"
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| 157 | }
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| 158 | demo
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| 159 | echo "a[1]=${a[1]}"
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| 160 |
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| 161 | echo ---
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| 162 |
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| 163 | shopt --unset dynamic_scope # should NOT affect read
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| 164 | demo
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| 165 | echo "a[1]=${a[1]}"
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| 166 |
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| 167 | ## STDOUT:
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| 168 | a[1]=42
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| 169 | a[1]=dynamic-scope
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| 170 | a[1]=
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| 171 | ---
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| 172 | a[1]=42
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| 173 | a[1]=42
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| 174 | a[1]=
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| 175 | ## END
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| 176 |
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| 177 | #### ${undef=a} and shopt --unset dynamic_scope
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| 178 |
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| 179 | set-x() {
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| 180 | : ${x=new}
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| 181 | }
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| 182 | demo() {
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| 183 | local x
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| 184 | echo x=$x
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| 185 | set-x
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| 186 | echo x=$x
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| 187 | }
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| 188 |
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| 189 | demo
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| 190 | echo x=$x
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| 191 |
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| 192 | echo ---
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| 193 |
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| 194 | # Now this IS affected?
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| 195 | shopt --unset dynamic_scope
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| 196 | demo
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| 197 | echo x=$x
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| 198 | ## STDOUT:
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| 199 | x=
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| 200 | x=new
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| 201 | x=
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| 202 | ---
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| 203 | x=
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| 204 | x=
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| 205 | x=
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| 206 | ## END
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| 207 |
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| 208 | #### declare -p respects it
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| 209 | __g=G
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| 210 | show-vars() {
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| 211 | local __x=X
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| 212 | declare -p | grep '__'
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| 213 | echo status=$?
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| 214 |
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| 215 | echo -
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| 216 | declare -p __y | grep '__'
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| 217 | echo status=$?
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| 218 | }
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| 219 |
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| 220 | demo() {
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| 221 | local __y=Y
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| 222 |
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| 223 | show-vars
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| 224 | echo ---
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| 225 | shopt --unset dynamic_scope
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| 226 | show-vars
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| 227 | }
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| 228 |
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| 229 | demo
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| 230 |
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| 231 | ## STDOUT:
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| 232 | declare -- __g=G
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| 233 | declare -- __x=X
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| 234 | declare -- __y=Y
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| 235 | status=0
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| 236 | -
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| 237 | declare -- __y=Y
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| 238 | status=0
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| 239 | ---
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| 240 | declare -- __g=G
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| 241 | declare -- __x=X
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| 242 | status=0
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| 243 | -
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| 244 | status=1
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| 245 | ## END
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| 246 |
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| 247 |
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| 248 | #### OshLanguageSetValue constructs
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| 249 |
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| 250 | f() {
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| 251 | (( x = 42 ))
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| 252 | }
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| 253 | demo() {
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| 254 | f
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| 255 | echo x=$x
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| 256 | }
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| 257 |
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| 258 | demo
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| 259 |
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| 260 | echo ---
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| 261 |
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| 262 | shopt --unset dynamic_scope
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| 263 |
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| 264 | unset x
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| 265 |
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| 266 | demo
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| 267 |
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| 268 | echo --- global
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| 269 | echo x=$x
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| 270 | ## STDOUT:
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| 271 | x=42
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| 272 | ---
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| 273 | x=
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| 274 | --- global
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| 275 | x=
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| 276 | ## END
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| 277 |
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| 278 |
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| 279 | #### shell assignments 'neutered' inside 'proc'
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| 280 | shopt --set parse_proc
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| 281 |
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| 282 | # They can't mutate globals or anything higher on the stack
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| 283 |
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| 284 | proc p {
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| 285 | declare g=PROC
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| 286 | export e=PROC
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| 287 | }
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| 288 |
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| 289 | f() {
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| 290 | g=SH
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| 291 | export e=SH
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| 292 | }
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| 293 |
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| 294 | e=E
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| 295 | g=G
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| 296 | p
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| 297 | echo e=$e g=$g
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| 298 |
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| 299 | p
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| 300 | echo e=$e g=$g
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| 301 |
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| 302 | f
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| 303 | echo e=$e g=$g
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| 304 |
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| 305 | ## STDOUT:
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| 306 | e=E g=G
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| 307 | e=E g=G
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| 308 | e=SH g=SH
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| 309 | ## END
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| 310 |
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| 311 | #### setglobal still allows setting globals
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| 312 | shopt --set parse_proc
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| 313 |
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| 314 | proc p {
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| 315 | setglobal new_global = 'p'
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| 316 | setglobal g = 'p'
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| 317 | }
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| 318 |
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| 319 | var g = 'G'
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| 320 |
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| 321 | p
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| 322 |
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| 323 | echo g=$g new_global=$new_global
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| 324 | ## STDOUT:
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| 325 | g=p new_global=p
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| 326 | ## END
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| 327 |
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| 328 | #### setglobal d[key] inside proc should mutate global (bug #1841)
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| 329 |
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| 330 | shopt -s ysh:upgrade
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| 331 |
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| 332 | var g = {}
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| 333 |
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| 334 | proc mutate {
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| 335 | var g = {'local': 1} # shadows global var
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| 336 |
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| 337 | setglobal g.key = 'mutated'
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| 338 | setglobal g['key2'] = 'mutated'
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| 339 |
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| 340 | echo 'local that is ignored'
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| 341 | pp test_ (g)
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| 342 | }
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| 343 |
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| 344 | echo 'BEFORE mutate global'
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| 345 | pp test_ (g)
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| 346 |
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| 347 | mutate
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| 348 |
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| 349 | echo 'AFTER mutate global'
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| 350 | pp test_ (g)
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| 351 |
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| 352 | ## STDOUT:
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| 353 | BEFORE mutate global
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| 354 | (Dict) {}
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| 355 | local that is ignored
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| 356 | (Dict) {"local":1}
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| 357 | AFTER mutate global
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| 358 | (Dict) {"key":"mutated","key2":"mutated"}
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| 359 | ## END
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| 360 |
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| 361 | #### setglobal a[i] inside proc
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| 362 | shopt -s ysh:upgrade
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| 363 |
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| 364 | var a = [0]
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| 365 |
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| 366 | proc mutate {
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| 367 | var a = [1] # shadows global var
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| 368 |
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| 369 | echo 'local that is ignored'
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| 370 | setglobal a[0] = 42
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| 371 |
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| 372 | pp test_ (a)
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| 373 | }
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| 374 |
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| 375 | echo 'BEFORE mutate global'
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| 376 | pp test_ (a)
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| 377 |
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| 378 | mutate
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| 379 |
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| 380 | echo 'AFTER mutate global'
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| 381 | pp test_ (a)
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| 382 |
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| 383 | ## STDOUT:
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| 384 | BEFORE mutate global
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| 385 | (List) [0]
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| 386 | local that is ignored
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| 387 | (List) [1]
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| 388 | AFTER mutate global
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| 389 | (List) [42]
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| 390 | ## END
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| 391 |
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| 392 | #### setglobal a[i] += and d.key +=
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| 393 | shopt -s ysh:upgrade
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| 394 |
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| 395 | var mylist = [0]
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| 396 | var mydict = {k: 0}
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| 397 |
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| 398 | proc mutate {
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| 399 | # these locals are ignored
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| 400 | var mylist = []
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| 401 | var mydict = {}
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| 402 |
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| 403 | setglobal mylist[0] += 5
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| 404 | setglobal mydict['k'] += 5
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| 405 | }
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| 406 |
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| 407 | mutate
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| 408 |
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| 409 | pp test_ (mylist)
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| 410 | pp test_ (mydict)
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| 411 |
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| 412 | ## STDOUT:
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| 413 | (List) [5]
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| 414 | (Dict) {"k":5}
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| 415 | ## END
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| 416 |
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| 417 | #### setglobal a[i] - i can be local or global
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| 418 | shopt -s ysh:upgrade
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| 419 |
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| 420 | var mylist = [0, 1]
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| 421 | var mydict = {k: 0, n: 1}
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| 422 |
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| 423 | var i = 0
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| 424 | var key = 'k'
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| 425 |
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| 426 | proc mutate1 {
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| 427 | var mylist = [] # IGNORED
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| 428 | var mydict = {} # IGNORED
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| 429 |
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| 430 | var i = 1
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| 431 | var key = 'n'
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| 432 |
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| 433 | setglobal mylist[i] = 11
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| 434 | setglobal mydict[key] = 11
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| 435 | }
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| 436 |
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| 437 | # Same thing without locals
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| 438 | proc mutate2 {
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| 439 | var mylist = [] # IGNORED
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| 440 | var mydict = {} # IGNORED
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| 441 |
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| 442 | setglobal mylist[i] = 22
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| 443 | setglobal mydict[key] = 22
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| 444 | }
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| 445 |
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| 446 | mutate1
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| 447 |
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| 448 | pp test_ (mylist)
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| 449 | pp test_ (mydict)
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| 450 | echo
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| 451 |
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| 452 | mutate2
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| 453 |
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| 454 | pp test_ (mylist)
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| 455 | pp test_ (mydict)
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| 456 |
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| 457 | ## STDOUT:
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| 458 | (List) [0,11]
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| 459 | (Dict) {"k":0,"n":11}
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| 460 |
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| 461 | (List) [22,11]
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| 462 | (Dict) {"k":22,"n":11}
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| 463 | ## END
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| 464 |
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| 465 | #### unset inside proc uses local scope
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| 466 | shopt --set parse_brace
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| 467 | shopt --set parse_proc
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| 468 |
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| 469 | f() {
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| 470 | unset x
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| 471 | }
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| 472 |
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| 473 | proc p() {
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| 474 | unset x
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| 475 | }
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| 476 |
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| 477 | proc p2() {
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| 478 | shopt --set dynamic_scope { # turn it back on
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| 479 | unset x
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| 480 | }
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| 481 | }
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| 482 |
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| 483 | x=foo
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| 484 | f
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| 485 | echo f x=$x
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| 486 |
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| 487 | x=bar
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| 488 | p
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| 489 | echo p x=$x
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| 490 |
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| 491 | x=spam
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| 492 | p2
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| 493 | echo p2 x=$x
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| 494 |
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| 495 | ## STDOUT:
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| 496 | f x=
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| 497 | p x=bar
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| 498 | p2 x=
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| 499 | ## END
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| 500 |
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| 501 | #### unset composes when you turn on dynamic scope
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| 502 | shopt -s ysh:all
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| 503 |
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| 504 | proc unset-two (v, w) {
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| 505 | shopt --set dynamic_scope {
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| 506 | unset $v
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| 507 | unset $w
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| 508 | }
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| 509 | }
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| 510 |
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| 511 | demo() {
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| 512 | local x=X
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| 513 | local y=Y
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| 514 |
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| 515 | echo "x=$x y=$y"
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| 516 |
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| 517 | unset-two x y
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| 518 |
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| 519 | shopt --unset nounset
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| 520 | echo "x=$x y=$y"
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| 521 | }
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| 522 |
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| 523 | demo
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| 524 | ## STDOUT:
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| 525 | x=X y=Y
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| 526 | x= y=
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| 527 | ## END
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| 528 |
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| 529 | #### Temp Bindings
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| 530 | shopt --set parse_proc
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| 531 |
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| 532 | myfunc() {
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| 533 | echo myfunc FOO=$FOO
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| 534 | }
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| 535 | proc myproc() {
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| 536 | echo myproc FOO=$FOO
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| 537 | }
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| 538 |
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| 539 | FOO=bar myfunc
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| 540 | FOO=bar myproc
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| 541 | FOO=bar echo inline FOO=$FOO
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| 542 | FOO=bar printenv.py FOO
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| 543 |
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| 544 | ## STDOUT:
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| 545 | myfunc FOO=bar
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| 546 | myproc FOO=
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| 547 | inline FOO=
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| 548 | bar
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| 549 | ## END
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| 550 |
|
| 551 | #### cd blocks don't introduce new scopes
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| 552 | shopt --set oil:upgrade
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| 553 |
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| 554 | var x = 42
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| 555 | cd / {
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| 556 | var y = 0
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| 557 | var z = 1
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| 558 | echo $x $y $z
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| 559 | setvar y = 43
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| 560 | }
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| 561 | setvar z = 44
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| 562 | echo $x $y $z
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| 563 |
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| 564 | ## STDOUT:
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| 565 | 42 0 1
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| 566 | 42 43 44
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| 567 | ## END
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| 568 |
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| 569 | #### IFS=: myproc exports when it doesn't need to
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| 570 | shopt --set parse_proc
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| 571 | shopt --set parse_brace
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| 572 |
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| 573 | source --builtin ysh/shvar.ysh
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| 574 |
|
| 575 | s='xzx zxz'
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| 576 |
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| 577 | myfunc() {
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| 578 | echo myfunc IFS="$IFS"
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| 579 | argv.py $s
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| 580 | }
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| 581 |
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| 582 | proc myproc() {
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| 583 | echo myproc IFS="$IFS"
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| 584 | argv.py $s
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| 585 | }
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| 586 |
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| 587 | IFS=: $REPO_ROOT/spec/bin/printenv.py IFS
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| 588 |
|
| 589 | # default value
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| 590 | echo "$IFS" | od -A n -t x1
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| 591 |
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| 592 | IFS=' z'
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| 593 | echo IFS="$IFS"
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| 594 |
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| 595 | IFS=' x' myfunc
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| 596 |
|
| 597 | # Problem: $IFS in procs only finds GLOBAL values. But when actually
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| 598 | # splitting, $IFS is a 'shvar' which respects DYNAMIC scope.
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| 599 | # Use shvarGet('IFS') instead
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| 600 |
|
| 601 | IFS=' x' myproc
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| 602 |
|
| 603 | # Oil solution to the problem
|
| 604 | shvar IFS=' x' {
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| 605 | myproc
|
| 606 | }
|
| 607 |
|
| 608 | ## STDOUT:
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| 609 | :
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| 610 | 20 09 0a 0a
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| 611 | IFS= z
|
| 612 | myfunc IFS= x
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| 613 | ['', 'z', 'z', 'z']
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| 614 | myproc IFS= z
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| 615 | ['', 'z', 'z', 'z']
|
| 616 | myproc IFS= x
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| 617 | ['', 'z', 'z', 'z']
|
| 618 | ## END
|
| 619 |
|
| 620 | #### shvar usage
|
| 621 | shopt --set oil:upgrade
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| 622 | shopt --unset errexit
|
| 623 |
|
| 624 | source --builtin ysh/shvar.ysh
|
| 625 |
|
| 626 | # no block
|
| 627 | shvar
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| 628 | echo status=$?
|
| 629 |
|
| 630 | shvar { # no arg
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| 631 | true
|
| 632 | }
|
| 633 | echo status=$?
|
| 634 |
|
| 635 | shvar foo { # should be name=value
|
| 636 | true
|
| 637 | }
|
| 638 | echo status=$?
|
| 639 | ## STDOUT:
|
| 640 | status=2
|
| 641 | status=2
|
| 642 | status=2
|
| 643 | ## END
|
| 644 |
|
| 645 | #### shvar global
|
| 646 | shopt --set oil:upgrade
|
| 647 | shopt --unset nounset
|
| 648 |
|
| 649 | source --builtin ysh/shvar.ysh
|
| 650 |
|
| 651 | echo _ESCAPER=$_ESCAPER
|
| 652 | echo _DIALECT=$_DIALECT
|
| 653 |
|
| 654 | shvar _ESCAPER=html _DIALECT=ninja {
|
| 655 | echo block _ESCAPER=$_ESCAPER
|
| 656 | echo block _DIALECT=$_DIALECT
|
| 657 | }
|
| 658 |
|
| 659 | echo _ESCAPER=$_ESCAPER
|
| 660 | echo _DIALECT=$_DIALECT
|
| 661 |
|
| 662 | # Now set them
|
| 663 | _ESCAPER=foo
|
| 664 | _DIALECT=bar
|
| 665 |
|
| 666 | echo ___
|
| 667 |
|
| 668 | echo _ESCAPER=$_ESCAPER
|
| 669 | echo _DIALECT=$_DIALECT
|
| 670 |
|
| 671 | shvar _ESCAPER=html _DIALECT=ninja {
|
| 672 | echo block _ESCAPER=$_ESCAPER
|
| 673 | echo block _DIALECT=$_DIALECT
|
| 674 |
|
| 675 | shvar _ESCAPER=nested {
|
| 676 | echo nested _ESCAPER=$_ESCAPER
|
| 677 | echo nested _DIALECT=$_DIALECT
|
| 678 | }
|
| 679 | }
|
| 680 |
|
| 681 | echo _ESCAPER=$_ESCAPER
|
| 682 | echo _DIALECT=$_DIALECT
|
| 683 |
|
| 684 | ## STDOUT:
|
| 685 | _ESCAPER=
|
| 686 | _DIALECT=
|
| 687 | block _ESCAPER=html
|
| 688 | block _DIALECT=ninja
|
| 689 | _ESCAPER=
|
| 690 | _DIALECT=
|
| 691 | ___
|
| 692 | _ESCAPER=foo
|
| 693 | _DIALECT=bar
|
| 694 | block _ESCAPER=html
|
| 695 | block _DIALECT=ninja
|
| 696 | nested _ESCAPER=nested
|
| 697 | nested _DIALECT=ninja
|
| 698 | _ESCAPER=foo
|
| 699 | _DIALECT=bar
|
| 700 | ## END
|
| 701 |
|
| 702 | #### shvar local
|
| 703 | shopt --set oil:upgrade # blocks
|
| 704 | shopt --unset simple_word_eval # test word splitting
|
| 705 |
|
| 706 | source --builtin ysh/shvar.ysh
|
| 707 |
|
| 708 | proc foo {
|
| 709 | shvar IFS=x MYTEMP=foo {
|
| 710 | echo IFS="$IFS"
|
| 711 | argv.py $s
|
| 712 | echo MYTEMP=${MYTEMP:-undef}
|
| 713 | }
|
| 714 | }
|
| 715 | var s = 'a b c'
|
| 716 | argv.py $s
|
| 717 | foo
|
| 718 | argv.py $s
|
| 719 | echo MYTEMP=${MYTEMP:-undef}
|
| 720 | ## STDOUT:
|
| 721 | ['a', 'b', 'c']
|
| 722 | IFS=x
|
| 723 | ['a b c']
|
| 724 | MYTEMP=foo
|
| 725 | ['a', 'b', 'c']
|
| 726 | MYTEMP=undef
|
| 727 | ## END
|
| 728 |
|
| 729 | #### shvar IFS
|
| 730 | shopt --set oil:upgrade
|
| 731 |
|
| 732 | source --builtin ysh/shvar.ysh
|
| 733 |
|
| 734 | proc myproc() {
|
| 735 | echo "$IFS" | od -A n -t x1
|
| 736 |
|
| 737 | local mylocal=x
|
| 738 | shvar IFS=w {
|
| 739 | echo inside IFS="$IFS"
|
| 740 | echo mylocal="$mylocal" # I do NOT want a new scope!
|
| 741 | }
|
| 742 | echo "$IFS" | od -A n -t x1
|
| 743 | }
|
| 744 |
|
| 745 | myproc
|
| 746 | ## STDOUT:
|
| 747 | 20 09 0a 0a
|
| 748 | inside IFS=w
|
| 749 | mylocal=x
|
| 750 | 20 09 0a 0a
|
| 751 | ## END
|
| 752 |
|
| 753 | #### shvarGet()
|
| 754 | shopt --set parse_proc
|
| 755 |
|
| 756 | s='xzx zxz'
|
| 757 |
|
| 758 | proc myproc {
|
| 759 | echo wrong IFS="$IFS" # NOT what's used
|
| 760 | echo shvar IFS=$[shvarGet('IFS')] # what IS used: dynamic scope
|
| 761 | argv.py $s
|
| 762 | }
|
| 763 |
|
| 764 | IFS=x
|
| 765 | IFS=z myproc
|
| 766 |
|
| 767 | # null
|
| 768 | echo $[shvarGet('nonexistent')]
|
| 769 |
|
| 770 | ## STDOUT:
|
| 771 | wrong IFS=x
|
| 772 | shvar IFS=z
|
| 773 | ['x', 'x ', 'x']
|
| 774 | null
|
| 775 | ## END
|
| 776 |
|