


Golang Template with Switch & ForEach
Problem: Construct a bash script from a Golang program that iterates over a list of dependencies, checks their types, and prints customized commands based on those types using switch-case statements.
Answer:
The following updated Golang code accomplishes the desired behavior:
<code class="go">package main import ( "log" "text/template" "gopkg.in/yaml.v2" "os" ) type File struct { TypeVersion string `yaml:"_type-version"` Dependency []Dependency } type Dependency struct { Name string Type string } func main() { f := File{} err := yaml.Unmarshal([]byte(data), &f) if err != nil { log.Fatalf("error: %v", err) } const t = ` #!/bin/bash {{range .Dependency}} echo "type is {{.Type}}" {{switch .Type}} case "runner1": echo "Submitting api1" case "runner2": echo "Submitting api2" default: echo "Unknown type" {{end}} {{end}} ` tt := template.Must(template.New("").Parse(t)) err = tt.Execute(os.Stdout, f) if err != nil { log.Println("executing template:", err) } }</code>
Explanation:
- The code uses text/template to format the output string.
- The range keyword iterates over the Dependency array.
- Inside the loop, a switch-case block is used to customize the output based on the Type of the dependency.
- The case statements handle specific Type values and print the desired commands.
- The default case handles types that are not specifically defined.
Result:
The example bash script produced by this code is:
<code class="bash">#!/bin/bash echo "type is runner" Submitting api1 echo "type is runner2" Submitting api2</code>
Additional Considerations:
- The example YAML data is hard-coded in the data variable. In a real-world scenario, this could be loaded from a file or database.
- The API mapping (from Type to command) could be implemented as a map or separate configuration file for improved flexibility.
- The cwd and Install fields in the Dependency struct are unused in this solution, as they were not required for the demo.
The above is the detailed content of How to Generate a Customized Bash Script Using Go Templates, Switch-Case Statements, and YAML Data?. For more information, please follow other related articles on the PHP Chinese website!

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