Initial pass at command parser (923b0c03) · Commits · Personal Projects / bulletin

dclish/dclish.go

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Original line number	Diff line number	Diff line
		// Package dclish A DCL-like command line parser.
		package dclish

		import (
		"fmt"
		"strings"
		)

		// ActionFunc is the function that a command runs.
		type ActionFunc func(string, *Command) error

		// Flag is a flag for a command.
		type Flag struct {
		Name string
		Value string
		Description string
		}

		// Flags is the list of flags.
		type Flags []*Flag

		// Command contains the definition of a command, it's flags and subcommands.
		type Command struct {
		Command string
		Flags Flags
		Args []string
		Commands []*Command
		Action ActionFunc
		Description string
		}

		// Commands is the full list of commands.
		type Commands []*Command

		// ParseAndRun parses a command line and runs the command.
		func (c Commands) ParseAndRun(line string) error {
		// TODO: this doesn't handle a DCL command line completely.
		words := strings.Fields(line)
		fmt.Printf("TODO ParseAndRun sees: %s\n", words)
		cmd := strings.ToUpper(words[0])
		for i := range c {
		if c[i].Command == cmd {
		fmt.Printf("Command help:\n%s\n", c[i].Description)
		return nil
		}
		}
		fmt.Printf("ERROR: Unknown command '%s'\n", cmd)
		return nil
		}

+2512 −263

File changed.

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		@@ -3,7 +3,6 @@ package repl

		import (
		"fmt"
		"strings"

		"github.com/chzyer/readline"
		)
		@@ -22,13 +21,12 @@ func Loop(user string) error {
		if err != nil {
		return err
		}
		words := strings.Field(strings.ReplaceAll(line, "/", " /"))
		if len(words) {
		if len(line) == 0 {
		continue
		}
		switch strings.ToUpper(words[0]) {
		case "ADD":
		commandAdd()
		err = commands.ParseAndRun(line)
		if err != nil {
		return err
		}
		}