gator/internal/executors/executors.go

package executors

import (
	"errors"
	"fmt"

	"codeflow.dananglin.me.uk/apollo/gator/internal/state"
)

type executorFunc func(*state.State, executor) error

type executor struct {
	Name string
	Args []string
}

func Run(s *state.State, args []string) error {
	exe, err := newExecutor(args)
	if err != nil {
		return fmt.Errorf("unable to parse the command: %w", err)
	}

	exeMap := executorFuncMap()

	runFunc, ok := exeMap[exe.Name]
	if !ok {
		return fmt.Errorf("unrecognised command: %s", exe.Name)
	}

	return runFunc(s, exe)
}

func newExecutor(args []string) (executor, error) {
	if len(args) == 0 {
		return executor{}, errors.New("no arguments given")
	}

	if len(args) == 1 {
		return executor{
			Name: args[0],
			Args: make([]string, 0),
		}, nil
	}

	return executor{
		Name: args[0],
		Args: args[1:],
	}, nil
}

func executorFuncMap() map[string]executorFunc {
	return map[string]executorFunc{
		"login":     login,
		"register":  register,
		"reset":     reset,
		"users":     users,
		"aggregate": aggregate,
		"addfeed":   middlewareLoggedIn(addFeed),
		"feeds":     feeds,
		"follow":    middlewareLoggedIn(follow),
		"unfollow":  middlewareLoggedIn(unfollow),
		"following": middlewareLoggedIn(following),
		"browse":    middlewareLoggedIn(browse),
	}
}