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@ -24,6 +24,7 @@ import (
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"github.com/BurntSushi/toml"
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"github.com/Masterminds/sprig/v3"
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"github.com/itchyny/gojq"
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"sigs.k8s.io/yaml"
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)
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@ -35,12 +36,11 @@ import (
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//
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// Known late-bound functions:
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//
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// - "include"
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// - "tpl"
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// - "include"
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// - "tpl"
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//
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// These are late-bound in Engine.Render(). The
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// version included in the FuncMap is a placeholder.
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//
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func funcMap() template.FuncMap {
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f := sprig.TxtFuncMap()
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delete(f, "env")
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@ -55,6 +55,7 @@ func funcMap() template.FuncMap {
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"toJson": toJSON,
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"fromJson": fromJSON,
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"fromJsonArray": fromJSONArray,
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"jq": jq,
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// This is a placeholder for the "include" function, which is
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// late-bound to a template. By declaring it here, we preserve the
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@ -175,3 +176,36 @@ func fromJSONArray(str string) []interface{} {
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}
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return a
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}
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// jq is like sed for JSON/YAML data - you can use it to slice and filter
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// and map and transform structured data with the same ease that sed, awk, grep
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// and friends let you play with text.
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//
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// See the [jq Tutorial](https://stedolan.github.io/jq/tutorial/) for more.
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//
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// This is a pure go implementation of jq. The type of v should be
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// []interface{} for an array or map[string]interface{} for a map.
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// Since the jq filter returns a iterator, it will be collected as a slice
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// even there is only one item.
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// It will insert the returned error message string as
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// the first and only item in the returned array.
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func jq(exp string, v interface{}) []interface{} {
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query, err := gojq.Parse(exp)
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if err != nil {
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return []interface{}{err.Error()}
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}
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iter := query.Run(v)
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var list []interface{}
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for {
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it, ok := iter.Next()
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if !ok {
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break
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}
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if err, ok := it.(error); ok {
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return []interface{}{err.Error()}
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}
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list = append(list, it)
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}
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return list
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}
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longkai
3 years ago