yq/cmd/evalute_sequence_command.go

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package cmd
import (
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"errors"
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"fmt"
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"os"
"github.com/mikefarah/yq/v4/pkg/yqlib"
"github.com/spf13/cobra"
)
func createEvaluateSequenceCommand() *cobra.Command {
var cmdEvalSequence = &cobra.Command{
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Use: "eval [expression] [yaml_file1]...",
Aliases: []string{"e"},
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Short: "Apply expression to each document in each yaml file given in sequence",
Example: `
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# runs the expression against each file, in series
yq e '.a.b | length' f1.yml f2.yml
# prints out the file
yq e sample.yaml
# prints a new yaml document
yq e -n '.a.b.c = "cat"'
# updates file.yaml directly
yq e '.a.b = "cool"' -i file.yaml
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`,
Long: "Evaluate Sequence:\nIterate over each yaml document, apply the expression and print the results, in sequence.",
RunE: evaluateSequence,
}
return cmdEvalSequence
}
func evaluateSequence(cmd *cobra.Command, args []string) error {
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cmd.SilenceUsage = true
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// 0 args, read std in
// 1 arg, null input, process expression
// 1 arg, read file in sequence
// 2+ args, [0] = expression, file the rest
var err error
stat, _ := os.Stdin.Stat()
pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
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out := cmd.OutOrStdout()
fileInfo, _ := os.Stdout.Stat()
if forceColor || (!forceNoColor && (fileInfo.Mode()&os.ModeCharDevice) != 0) {
colorsEnabled = true
}
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if writeInplace && len(args) < 2 {
return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
}
if writeInplace {
// only use colors if its forced
colorsEnabled = forceColor
writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[1])
out, err = writeInPlaceHandler.CreateTempFile()
if err != nil {
return err
}
// need to indirectly call the function so that completedSuccessfully is
// passed when we finish execution as opposed to now
defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
}
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printer := yqlib.NewPrinter(out, outputToJSON, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
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streamEvaluator := yqlib.NewStreamEvaluator()
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switch len(args) {
case 0:
if pipingStdIn {
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err = streamEvaluator.EvaluateFiles("", []string{"-"}, printer)
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} else {
cmd.Println(cmd.UsageString())
return nil
}
case 1:
if nullInput {
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err = streamEvaluator.EvaluateNew(args[0], printer)
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} else {
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err = streamEvaluator.EvaluateFiles("", []string{args[0]}, printer)
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}
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default:
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err = streamEvaluator.EvaluateFiles(args[0], args[1:], printer)
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}
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completedSuccessfully = err == nil
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if err == nil && exitStatus && !printer.PrintedAnything() {
return errors.New("no matches found")
}
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return err
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}