mirror of https://github.com/mikefarah/yq.git
122 lines
3.1 KiB
Go
122 lines
3.1 KiB
Go
package cmd
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import (
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"errors"
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"fmt"
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"os"
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"github.com/mikefarah/yq/v4/pkg/yqlib"
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"github.com/spf13/cobra"
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)
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func createEvaluateSequenceCommand() *cobra.Command {
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var cmdEvalSequence = &cobra.Command{
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Use: "eval [expression] [yaml_file1]...",
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Aliases: []string{"e"},
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Short: "Apply expression to each document in each yaml file given in sequence",
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Example: `
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# runs the expression against each file, in series
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yq e '.a.b | length' f1.yml f2.yml
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# prints out the file
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yq e sample.yaml
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# prints a new yaml document
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yq e -n '.a.b.c = "cat"'
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# updates file.yaml directly
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yq e '.a.b = "cool"' -i file.yaml
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`,
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Long: "Evaluate Sequence:\nIterate over each yaml document, apply the expression and print the results, in sequence.",
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RunE: evaluateSequence,
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}
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return cmdEvalSequence
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}
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func processExpression(expression string) string {
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if prettyPrint && expression == "" {
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return `... style=""`
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} else if prettyPrint {
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return fmt.Sprintf("%v | ... style= \"\"", expression)
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}
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return expression
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}
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func evaluateSequence(cmd *cobra.Command, args []string) error {
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cmd.SilenceUsage = true
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// 0 args, read std in
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// 1 arg, null input, process expression
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// 1 arg, read file in sequence
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// 2+ args, [0] = expression, file the rest
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var err error
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stat, _ := os.Stdin.Stat()
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pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
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out := cmd.OutOrStdout()
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fileInfo, _ := os.Stdout.Stat()
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if forceColor || (!forceNoColor && (fileInfo.Mode()&os.ModeCharDevice) != 0) {
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colorsEnabled = true
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}
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firstFileIndex := -1
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if !nullInput && len(args) == 1 {
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firstFileIndex = 0
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} else if len(args) > 1 {
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firstFileIndex = 1
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}
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if writeInplace && (firstFileIndex == -1) {
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return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
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}
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if writeInplace {
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// only use colors if its forced
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colorsEnabled = forceColor
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writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
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out, err = writeInPlaceHandler.CreateTempFile()
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if err != nil {
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return err
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}
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// need to indirectly call the function so that completedSuccessfully is
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// passed when we finish execution as opposed to now
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defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
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}
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printer := yqlib.NewPrinter(out, outputToJSON, unwrapScalar, colorsEnabled, indent, !noDocSeparators)
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streamEvaluator := yqlib.NewStreamEvaluator()
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if nullInput && len(args) > 1 {
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return errors.New("Cannot pass files in when using null-input flag")
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}
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switch len(args) {
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case 0:
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if pipingStdIn {
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err = streamEvaluator.EvaluateFiles(processExpression(""), []string{"-"}, printer)
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} else {
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cmd.Println(cmd.UsageString())
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return nil
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}
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case 1:
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if nullInput {
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err = streamEvaluator.EvaluateNew(processExpression(args[0]), printer)
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} else {
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err = streamEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer)
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}
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default:
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err = streamEvaluator.EvaluateFiles(processExpression(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() {
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return errors.New("no matches found")
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}
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return err
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}
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