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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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