601fcf40c4
Put these datastructures into an external package so they can be re-used for parsing elsewhere. Since we remove these dependencies, we need to manually import the GAPI's so that they register. Despite efforts to embed them deeper into the import tree without cycles, this failed. Logically what this told me is that it actually makes sense to allow a different binary with only one of the multiple GAPI's contained within.
91 lines
3.1 KiB
Go
91 lines
3.1 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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// EmptyArgs is the empty CLI parsing structure and type of the parsed result.
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type EmptyArgs struct{}
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// LangArgs is the lang CLI parsing structure and type of the parsed result.
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type LangArgs struct {
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// Input is the input mcl code or file path or any input specification.
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Input string `arg:"positional,required"`
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// TODO: removed (temporarily?)
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//Stdin bool `arg:"--stdin" help:"use passthrough stdin"`
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Download bool `arg:"--download" help:"download any missing imports"`
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OnlyDownload bool `arg:"--only-download" help:"stop after downloading any missing imports"`
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Update bool `arg:"--update" help:"update all dependencies to the latest versions"`
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OnlyUnify bool `arg:"--only-unify" help:"stop after type unification"`
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SkipUnify bool `arg:"--skip-unify" help:"skip type unification"`
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Depth int `arg:"--depth" default:"-1" help:"max recursion depth limit (-1 is unlimited)"`
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// The default of 0 means any error is a failure by default.
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Retry int `arg:"--depth" help:"max number of retries (-1 is unlimited)"`
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ModulePath string `arg:"--module-path,env:MGMT_MODULE_PATH" help:"choose the modules path (absolute)"`
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}
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// YamlArgs is the yaml CLI parsing structure and type of the parsed result.
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type YamlArgs struct {
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// Input is the input yaml code or file path or any input specification.
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Input string `arg:"positional,required"`
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}
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