85 lines
2.1 KiB
Go
85 lines
2.1 KiB
Go
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package cli
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import (
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"bytes"
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"fmt"
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"log"
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"sort"
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"strings"
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"github.com/mitchellh/cli"
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)
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// HelpFunc is a cli.HelpFunc that can is used to output the help for Vault.
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func HelpFunc(commands map[string]cli.CommandFactory) string {
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commonNames := map[string]struct{}{
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"delete": struct{}{},
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"help": struct{}{},
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"read": struct{}{},
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"renew": struct{}{},
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"revoke": struct{}{},
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"write": struct{}{},
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"server": struct{}{},
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"status": struct{}{},
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}
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// Determine the maximum key length, and classify based on type
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commonCommands := make(map[string]cli.CommandFactory)
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otherCommands := make(map[string]cli.CommandFactory)
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maxKeyLen := 0
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for key, f := range commands {
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if len(key) > maxKeyLen {
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maxKeyLen = len(key)
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}
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if _, ok := commonNames[key]; ok {
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commonCommands[key] = f
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} else {
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otherCommands[key] = f
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}
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}
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var buf bytes.Buffer
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buf.WriteString("usage: vault [-version] [-help] <command> [args]\n\n")
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buf.WriteString("Common commands:\n")
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buf.WriteString(listCommands(commonCommands, maxKeyLen))
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buf.WriteString("\nAll other commands:\n")
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buf.WriteString(listCommands(otherCommands, maxKeyLen))
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return buf.String()
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}
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// listCommands just lists the commands in the map with the
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// given maximum key length.
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func listCommands(commands map[string]cli.CommandFactory, maxKeyLen int) string {
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var buf bytes.Buffer
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// Get the list of keys so we can sort them, and also get the maximum
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// key length so they can be aligned properly.
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keys := make([]string, 0, len(commands))
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for key, _ := range commands {
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keys = append(keys, key)
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}
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sort.Strings(keys)
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for _, key := range keys {
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commandFunc, ok := commands[key]
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if !ok {
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// This should never happen since we JUST built the list of
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// keys.
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panic("command not found: " + key)
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}
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command, err := commandFunc()
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if err != nil {
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log.Printf("[ERR] cli: Command '%s' failed to load: %s",
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key, err)
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continue
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}
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key = fmt.Sprintf("%s%s", key, strings.Repeat(" ", maxKeyLen-len(key)))
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buf.WriteString(fmt.Sprintf(" %s %s\n", key, command.Synopsis()))
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}
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return buf.String()
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}
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