3e31ee9455
With the recent merging of embedded package imports and the entry CLI package, it is now possible for users to build in mcl code into a single binary. This additional permission makes it explicitly clear that this is permitted to make it easier for those users. The condition is phrased so that the terms can be "patched" by the original author if it's necessary for the project. For example, if the name of the language (mcl) changes, has a differently named new version, someone finds a phrasing improvement or a legal loophole, or for some other reasonable circumstance. Now go write some beautiful embedded tools!
103 lines
3.8 KiB
Go
103 lines
3.8 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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//
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// Additional permission under GNU GPL version 3 section 7
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//
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// If you modify this program, or any covered work, by linking or combining it
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// with embedded mcl code and modules (and that the embedded mcl code and
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// modules which link with this program, contain a copy of their source code in
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// the authoritative form) containing parts covered by the terms of any other
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// license, the licensors of this program grant you additional permission to
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// convey the resulting work. Furthermore, the licensors of this program grant
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// the original author, James Shubin, additional permission to update this
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// additional permission if he deems it necessary to achieve the goals of this
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// additional permission.
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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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