112 lines
2.3 KiB
Go
112 lines
2.3 KiB
Go
package cli
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import (
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"slices"
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"strings"
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logger "v/logger"
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state "v/state"
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)
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type Flags struct {
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AddPath bool
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NoCache bool
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Verbose bool
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RawOutput bool
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}
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// Represents a CLI invocation.
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// Must be initialized with commands via AddCommand before running
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// with Run.
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type CLI struct {
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Namespaces map[string]Namespace
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Metadata map[string]string
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}
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func (c *CLI) AddNamespace(namespace Namespace) *CLI {
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if c.Namespaces == nil {
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c.Namespaces = map[string]Namespace{}
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}
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c.Namespaces[namespace.Label] = namespace
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return c
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}
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func (c *CLI) ListNamespaces() []string {
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labels := []string{}
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for key := range c.Namespaces {
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labels = append(labels, key)
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}
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slices.Sort(labels)
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return labels
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}
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// Executes one of the registered commands if any match the provided
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// user arguments.
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func (c CLI) Run(args []string, currentState state.State) error {
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if len(args) == 0 {
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c.Help()
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return nil
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}
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action := args[0]
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if action == "help" {
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c.Help()
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return nil
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}
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flags := collectFlags(args)
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namespace, isNamespace := c.Namespaces[action]
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if isNamespace {
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action = args[1]
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return namespace.Commands[action].Handler(args[1:], flags, currentState)
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}
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rootNamespace := c.Namespaces[""]
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return rootNamespace.Commands[action].Handler(args, flags, currentState)
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}
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// Prints autogenerated help documentation specifying command usage
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// and descriptions based on registered commands (see: AddCommand).
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func (c CLI) Help() {
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logger.InfoLogger.Printf("v: A simple version manager. (v%s)\n---", c.Metadata["Version"])
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for _, namespaceLabel := range c.ListNamespaces() {
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namespace := c.Namespaces[namespaceLabel]
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for _, commandLabel := range namespace.ListCommands() {
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command := namespace.Commands[commandLabel]
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logger.InfoLogger.Printf("\033[1m%-30s\033[0m%s\n", command.Usage, command.Description)
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}
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}
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}
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// Traverses input arguments and extracts flags of
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// the form --<flag-label>.
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func collectFlags(args []string) Flags {
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collected := Flags{}
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for _, arg := range args {
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if !strings.HasPrefix(arg, "--") {
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continue
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}
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switch arg {
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case "--verbose":
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collected.Verbose = true
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case "--no-cache":
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collected.NoCache = true
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case "--add-path":
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collected.AddPath = true
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case "--raw":
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collected.RawOutput = true
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}
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}
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return collected
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}
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