76 lines
1.2 KiB
Go
76 lines
1.2 KiB
Go
package main
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import (
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"fmt"
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"os"
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"sort"
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)
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type context struct {
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commands map[string]cliCommand
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}
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func (r *context) register(c cliCommand) {
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if c.name != "" {
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r.commands[c.name] = c
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}
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}
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func NewContext() *context {
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var exitCommand = cliCommand{
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name: "exit",
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description: "Exit the Pokedex",
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callback: commandExit,
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}
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var helpCommand = cliCommand{
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name: "help",
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description: "Displays a help message",
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callback: commandHelp,
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}
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c := &context{
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commands: map[string]cliCommand{},
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}
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c.register(exitCommand)
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c.register(helpCommand)
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return c
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}
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type commandFunc func(c *context) error
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type cliCommand struct {
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name string
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description string
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callback commandFunc
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}
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func commandExit(c *context) error {
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fmt.Println("Closing the Pokedex... Goodbye!")
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os.Exit(0)
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return nil
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}
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func commandHelp(c *context) error {
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fmt.Println("Welcome to the Pokedex!")
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fmt.Println("Usage:")
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fmt.Println("")
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sortedKeys := []string{}
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for k := range c.commands {
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sortedKeys = append(sortedKeys, k)
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}
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sort.Strings(sortedKeys)
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for _, key := range sortedKeys {
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command := c.commands[key]
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fmt.Printf("%s: %s\n", command.name, command.description)
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}
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return nil
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}
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