d537c3d523
This lets us get the chosen subcommands dynamically and removes the eventual need for three package imports.
59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
// Mgmt
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// Copyright (C) 2013-2024+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package util
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import (
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"reflect"
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"strings"
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)
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// LookupSubcommand returns the name of the subcommand in the obj, of a struct.
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// This is useful for determining the name of the subcommand that was activated.
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// It returns an empty string if a specific name was not found.
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func LookupSubcommand(obj interface{}, st interface{}) string {
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val := reflect.ValueOf(obj)
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if val.Kind() == reflect.Ptr { // max one de-referencing
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val = val.Elem()
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}
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v := reflect.ValueOf(st) // value of the struct
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typ := val.Type()
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for i := 0; i < typ.NumField(); i++ {
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f := val.Field(i) // value of the field
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if f.Interface() != v.Interface() {
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continue
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}
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field := typ.Field(i)
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alias, ok := field.Tag.Lookup("arg")
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if !ok {
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continue
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}
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// XXX: `arg` needs a split by comma first or fancier parsing
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prefix := "subcommand"
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split := strings.Split(alias, ":")
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if len(split) != 2 || split[0] != prefix {
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continue
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}
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return split[1] // found
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}
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return "" // not found
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}
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