How can Golang templates be used to generate dynamic bash scripts with switch statements and ForEach loops?

Golang Template with Switch & ForEach

When constructing a bash script requiring dynamic commands, one can utilize Golang templates in conjunction with switches and ForEach loops.

Dependency Structure

Consider a dependency struct containing type information:

type Dependency struct {
    Name    string
    Type    string
    CWD     string
    Install []Install
}

Bash Script Template

Next, create a template for the bash script:

#!/bin/bash

{{range $d := .Dependency}}
echo "type is {{$d.Type}}"
echo "cwd is {{$d.CWD}}"
{{range $i := $d.Install}}
echo "install {{$i.name}}"
{{end}}
{{end}}

Template Execution

To generate the script using the template:

package main

import (
    "log"
    "text/template"
    "gopkg.in/yaml.v2"
    "os"
)

// ... (rest of the code unchanged)

func main() {
    // ... (rest of the code unchanged)

    const t = `
#!/bin/bash

{{range .Dependency}}
echo "type is {{.Type}}"
echo "cwd is {{.CWD}}"
{{range .Install}}
echo "install {{.name}}"
{{end}}
{{end}}
`

    tt := template.Must(template.New("").Parse(t))
    err = tt.Execute(os.Stdout, f)
    if err != nil {
        log.Println("executing template:", err)
    }
}

Output

Running go run main.go will produce the desired bash script:

#!/bin/bash

echo "type is runner"
echo "cwd is /ui"
echo "install api"

echo "type is runner2"
echo "cwd is /ui2"
echo "install api2"

Enhancements

For more flexibility, consider storing install steps in a separate map and interpolating them based on dependency type. This separates data ownership and allows for more dynamic script generation.

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