func loadPrereq()

in prereq.go [59:118]
39 lines of code
11 McCabe index (conditional complexity)

func loadPrereq(dir string) (tasks []string, versions []string, err error) {
	err = nil
	tasks = []string{}
	versions = []string{}

	if !exists(dir, PREREQ) {
		return
	}
	trace("found prereq.yml in ", dir)

	data, err := os.ReadFile(joinpath(dir, PREREQ))
	if err != nil {
		return
	}

	/*
			You have tasks = []strings and versions = []strings
			and dat a string with a YAML  in format:
			```yaml
			something:
			tasks:
			   task:
			      vars:
				     VERSION: "123"
			   anothertask:
		    ```
			I want to parse the file, find the entries under `tasks` vith a var with  VERSION
			and append, in order, to tasks the name of the task
			and to version the version found
			I have to skip the entries without a version and everyhing not in tasks
			I wnato just the plain code no procedures
	*/
	var root yaml.Node
	if err = yaml.Unmarshal([]byte(data), &root); err != nil {
		return
	}

	for i := 0; i < len(root.Content[0].Content); i += 2 {
		if root.Content[0].Content[i].Value == "tasks" {
			tasksNode := root.Content[0].Content[i+1]
			for j := 0; j < len(tasksNode.Content); j += 2 {
				taskName := tasksNode.Content[j].Value
				taskVars := tasksNode.Content[j+1]
				for k := 0; k < len(taskVars.Content); k += 2 {
					if taskVars.Content[k].Value == "vars" {
						varsNode := taskVars.Content[k+1]
						for l := 0; l < len(varsNode.Content); l += 2 {
							if varsNode.Content[l].Value == "VERSION" {
								version := varsNode.Content[l+1].Value
								tasks = append(tasks, taskName)
								versions = append(versions, version)
							}
						}
					}
				}
			}
		}
	}
	return
}