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pkg/gotohelm: implement go to helm transpiler
This commit introduces the gotohelm and helmette packages. The combination of which implement a golang to helm template transpiler. Equivalence between the go functions and helm templates is asserted for all test cases. There is no harness for doing so outside of the test environment, consumers will need to perform this assertion themselves. See gotohelm/doc.go for details on the transpiler and helmette/doc.go for details on the "helm in go" environment. gotohelm/testdata contains examples of the transpiled templates.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| package main | ||
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| import ( | ||
| "flag" | ||
| "fmt" | ||
| "os" | ||
| "path" | ||
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| "github.com/redpanda-data/helm-charts/pkg/gotohelm" | ||
| "golang.org/x/tools/go/packages" | ||
| ) | ||
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| func main() { | ||
| out := flag.String("write", "-", "The directory to write the transpiled templates to or - to write them to standard out") | ||
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| flag.Parse() | ||
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| cwd, _ := os.Getwd() | ||
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| pkgs, err := gotohelm.LoadPackages(&packages.Config{ | ||
| Dir: cwd, | ||
| }, flag.Args()...) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
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| for _, pkg := range pkgs { | ||
| chart, err := gotohelm.Transpile(pkg) | ||
| if err != nil { | ||
| fmt.Printf("Failed to transpile %q: %s\n", pkg.Name, err) | ||
| continue | ||
| } | ||
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| if *out == "-" { | ||
| writeToStdout(chart) | ||
| } else { | ||
| if err := writeToDir(chart, *out); err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
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| } | ||
| } | ||
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| func writeToStdout(chart *gotohelm.Chart) { | ||
| for _, f := range chart.Files { | ||
| fmt.Printf("%s\n", f.Name) | ||
| f.Write(os.Stdout) | ||
| fmt.Printf("\n\n") | ||
| } | ||
| } | ||
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| func writeToDir(chart *gotohelm.Chart, dir string) error { | ||
| for _, f := range chart.Files { | ||
| file, err := os.OpenFile(path.Join(dir, f.Name), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| f.Write(file) | ||
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| if err := file.Close(); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| } |
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