lourenco/mgmt
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cli: Lookup subcommand names dynamically

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This lets us get the chosen subcommands dynamically and removes the
eventual need for three package imports.
This commit is contained in:
James Shubin
2024-03-03 15:48:23 -05:00
parent a65c87b584
commit d537c3d523
3 changed files with 64 additions and 6 deletions
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6
cli/deploy.go
View File

@@ -68,15 +68,15 @@ func (obj *DeployArgs) Run(ctx context.Context, data *cliUtil.Data) (bool, error
var name string
var args interface{}
if cmd := obj.DeployEmpty; cmd != nil {
name = emptyGAPI.Name
name = cliUtil.LookupSubcommand(obj, cmd) // "empty"
args = cmd
}
if cmd := obj.DeployLang; cmd != nil {
name = langGAPI.Name
name = cliUtil.LookupSubcommand(obj, cmd) // "lang"
args = cmd
}
if cmd := obj.DeployYaml; cmd != nil {
name = yamlGAPI.Name
name = cliUtil.LookupSubcommand(obj, cmd) // "yaml"
args = cmd
}

6
cli/run.go
View File

@@ -109,15 +109,15 @@ func (obj *RunArgs) Run(ctx context.Context, data *cliUtil.Data) (bool, error) {
var name string
var args interface{}
if cmd := obj.RunEmpty; cmd != nil {
name = emptyGAPI.Name
name = cliUtil.LookupSubcommand(obj, cmd) // "empty"
args = cmd
}
if cmd := obj.RunLang; cmd != nil {
name = langGAPI.Name
name = cliUtil.LookupSubcommand(obj, cmd) // "lang"
args = cmd
}
if cmd := obj.RunYaml; cmd != nil {
name = yamlGAPI.Name
name = cliUtil.LookupSubcommand(obj, cmd) // "yaml"
args = cmd
}

58
cli/util/args.go Normal file
View File

@@ -0,0 +1,58 @@
// Mgmt
// Copyright (C) 2013-2024+ James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package util
import (
"reflect"
"strings"
)
// LookupSubcommand returns the name of the subcommand in the obj, of a struct.
// This is useful for determining the name of the subcommand that was activated.
// It returns an empty string if a specific name was not found.
func LookupSubcommand(obj interface{}, st interface{}) string {
val := reflect.ValueOf(obj)
if val.Kind() == reflect.Ptr { // max one de-referencing
val = val.Elem()
}
v := reflect.ValueOf(st) // value of the struct
typ := val.Type()
for i := 0; i < typ.NumField(); i++ {
f := val.Field(i) // value of the field
if f.Interface() != v.Interface() {
continue
}
field := typ.Field(i)
alias, ok := field.Tag.Lookup("arg")
if !ok {
continue
}
// XXX: `arg` needs a split by comma first or fancier parsing
prefix := "subcommand"
split := strings.Split(alias, ":")
if len(split) != 2 || split[0] != prefix {
continue
}
return split[1] // found
}
return "" // not found
}