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eval.go
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eval.go
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// Copyright 2017 The kubecfg authors
//
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"fmt"
"strings"
"github.com/kubecfg/kubecfg/pkg/kubecfg"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"github.com/spf13/viper"
)
const (
flagExpr = "expr"
flagShowKeys = "show-keys"
flagTrace = "trace"
)
func init() {
cmd := evalCmd
RootCmd.AddCommand(cmd)
cmd.PersistentFlags().StringP(flagExpr, "e", "", "jsonnet expression to evaluate")
cmd.PersistentFlags().BoolP(flagShowKeys, "k", false, "instead of rendering an object, list it's keys")
cmd.PersistentFlags().StringP(flagFormat, "o", "yaml", "Output format. Supported values are: json, yaml")
cmd.PersistentFlags().Bool(flagTrace, false, "print a causal trace")
addCommonEvalFlags(cmd, withoutShortEvalFlag())
}
func tlaNames(flags *pflag.FlagSet) ([]string, error) {
var names []string
for _, flagName := range []string{flagTLAVar, flagTLAVarFile, flagTLACode, flagTLACodeFile} {
entries, err := flags.GetStringArray(flagName)
if err != nil {
return nil, err
}
for _, entry := range entries {
key, _, _ := strings.Cut(entry, "=")
names = append(names, key)
}
}
return names, nil
}
var evalCmd = &cobra.Command{
Use: "eval",
Short: "eval jsonnet expression",
Args: cobra.ArbitraryArgs,
RunE: func(cmd *cobra.Command, args []string) error {
alpha := viper.GetBool(flagAlpha)
if !alpha {
return fmt.Errorf("eval is an alpha feature, please use --alpha")
}
flags := cmd.Flags()
var err error
c := kubecfg.EvalCmd{}
c.Expr, err = flags.GetString(flagExpr)
if err != nil {
return err
}
c.Format, err = flags.GetString(flagFormat)
if err != nil {
return err
}
c.ShowKeys, err = flags.GetBool(flagShowKeys)
if err != nil {
return err
}
c.Trace, err = flags.GetBool(flagTrace)
if err != nil {
return err
}
vm, err := JsonnetVM(cmd)
if err != nil {
return err
}
if len(args) < 1 {
return fmt.Errorf("jsonnet filename required")
}
tla, err := tlaNames(flags)
if err != nil {
return err
}
return c.Run(cmd.Context(), vm, args[0], tla)
},
}