| 1 | # Hay Metaprogramming
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| 2 |
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| 3 | #### Conditional Inside Blocks
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| 4 | shopt --set oil:all
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| 5 |
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| 6 | hay define Rule
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| 7 |
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| 8 | const DEBUG = true
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| 9 |
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| 10 | Rule one {
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| 11 | if (DEBUG) {
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| 12 | deps = 'foo'
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| 13 | } else {
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| 14 | deps = 'bar'
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| 15 | }
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| 16 | }
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| 17 |
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| 18 | json write (_hay()) | jq '.children[0]' > actual.txt
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| 19 |
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| 20 | diff -u - actual.txt <<EOF
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| 21 | {
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| 22 | "type": "Rule",
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| 23 | "args": [
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| 24 | "one"
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| 25 | ],
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| 26 | "children": [],
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| 27 | "attrs": {
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| 28 | "deps": "foo"
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| 29 | }
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| 30 | }
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| 31 | EOF
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| 32 |
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| 33 | ## STDOUT:
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| 34 | ## END
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| 35 |
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| 36 |
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| 37 | #### Conditional Outside Block
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| 38 | shopt --set oil:all
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| 39 |
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| 40 | hay define Rule
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| 41 |
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| 42 | const DEBUG = true
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| 43 |
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| 44 | if (DEBUG) {
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| 45 | Rule two {
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| 46 | deps = 'spam'
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| 47 | }
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| 48 | } else {
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| 49 | Rule two {
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| 50 | deps = 'bar'
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| 51 | }
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| 52 | }
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| 53 |
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| 54 | json write (_hay()) | jq '.children[0].attrs' > actual.txt
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| 55 |
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| 56 | diff -u - actual.txt <<EOF
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| 57 | {
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| 58 | "deps": "spam"
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| 59 | }
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| 60 | EOF
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| 61 |
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| 62 | ## STDOUT:
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| 63 | ## END
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| 64 |
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| 65 |
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| 66 | #### Iteration Inside Block
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| 67 | shopt --set oil:all
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| 68 |
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| 69 | hay define Rule
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| 70 |
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| 71 | Rule foo {
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| 72 | var d = {}
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| 73 | # private var with _
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| 74 | for name_ in spam eggs ham {
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| 75 | setvar d[name_] = true
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | json write (_hay()) | jq '.children[0].attrs' > actual.txt
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| 80 |
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| 81 | # For loop name leaks! Might want to make it "name_" instead!
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| 82 |
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| 83 | #cat actual.txt
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| 84 |
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| 85 | diff -u - actual.txt <<EOF
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| 86 | {
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| 87 | "d": {
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| 88 | "spam": true,
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| 89 | "eggs": true,
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| 90 | "ham": true
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| 91 | }
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| 92 | }
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| 93 | EOF
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| 94 |
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| 95 |
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| 96 | ## STDOUT:
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| 97 | ## END
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| 98 |
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| 99 |
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| 100 | #### Iteration Outside Block
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| 101 | shopt --set oil:all
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| 102 |
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| 103 | hay define Rule
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| 104 |
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| 105 | for name in spam eggs ham {
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| 106 | Rule $name {
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| 107 | path = "/usr/bin/$name"
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| 108 | }
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| 109 | }
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| 110 |
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| 111 | json write (_hay()) | jq '.children[].attrs' > actual.txt
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| 112 |
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| 113 | diff -u - actual.txt <<EOF
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| 114 | {
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| 115 | "path": "/usr/bin/spam"
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| 116 | }
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| 117 | {
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| 118 | "path": "/usr/bin/eggs"
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| 119 | }
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| 120 | {
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| 121 | "path": "/usr/bin/ham"
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| 122 | }
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| 123 | EOF
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| 124 |
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| 125 | ## STDOUT:
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| 126 | ## END
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| 127 |
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| 128 |
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| 129 | #### Proc Inside Block
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| 130 | shopt --set oil:all
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| 131 |
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| 132 | hay define rule # lower case allowed
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| 133 |
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| 134 | proc p(name; out) {
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| 135 | echo 'p'
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| 136 | call out->setValue(name)
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| 137 | }
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| 138 |
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| 139 | rule hello {
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| 140 | var eggs = ''
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| 141 | var bar = ''
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| 142 |
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| 143 | p spam (&eggs)
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| 144 | p foo (&bar)
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| 145 | }
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| 146 |
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| 147 | json write (_hay()) | jq '.children[0].attrs' > actual.txt
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| 148 |
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| 149 | diff -u - actual.txt <<EOF
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| 150 | {
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| 151 | "eggs": "spam",
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| 152 | "bar": "foo"
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| 153 | }
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| 154 | EOF
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| 155 |
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| 156 | ## STDOUT:
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| 157 | p
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| 158 | p
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| 159 | ## END
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| 160 |
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| 161 |
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| 162 |
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| 163 | #### Proc That Defines Block
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| 164 | shopt --set oil:all
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| 165 |
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| 166 | hay define Rule
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| 167 |
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| 168 | proc myrule(name) {
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| 169 |
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| 170 | # Each haynode has its own scope. But then it can't see the args! Oops.
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| 171 | # Is there a better way to do this?
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| 172 |
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| 173 | shopt --set dynamic_scope {
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| 174 | Rule $name {
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| 175 | path = "/usr/bin/$name"
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| 176 | }
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| 177 | }
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| 178 | }
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| 179 |
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| 180 | myrule spam
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| 181 | myrule eggs
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| 182 | myrule ham
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| 183 |
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| 184 | json write (_hay()) | jq '.children[].attrs' > actual.txt
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| 185 |
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| 186 | diff -u - actual.txt <<EOF
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| 187 | {
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| 188 | "path": "/usr/bin/spam"
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| 189 | }
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| 190 | {
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| 191 | "path": "/usr/bin/eggs"
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| 192 | }
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| 193 | {
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| 194 | "path": "/usr/bin/ham"
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| 195 | }
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| 196 | EOF
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| 197 |
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| 198 | ## STDOUT:
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| 199 | ## END
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| 200 |
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