mirror of https://github.com/mikefarah/yq.git
94 lines
2.0 KiB
Go
94 lines
2.0 KiB
Go
package yqlib
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import (
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"bufio"
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"io"
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"os"
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)
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type frontMatterHandler interface {
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Split() error
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GetYamlFrontMatterFilename() string
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GetContentReader() io.Reader
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CleanUp()
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}
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type frontMatterHandlerImpl struct {
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originalFilename string
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yamlFrontMatterFilename string
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contentReader io.Reader
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}
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func NewFrontMatterHandler(originalFilename string) frontMatterHandler {
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return &frontMatterHandlerImpl{originalFilename, "", nil}
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}
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func (f *frontMatterHandlerImpl) GetYamlFrontMatterFilename() string {
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return f.yamlFrontMatterFilename
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}
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func (f *frontMatterHandlerImpl) GetContentReader() io.Reader {
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return f.contentReader
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}
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func (f *frontMatterHandlerImpl) CleanUp() {
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tryRemoveFile(f.yamlFrontMatterFilename)
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}
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// Splits the given file by yaml front matter
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// yaml content will be saved to first temporary file
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// remaining content will be saved to second temporary file
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func (f *frontMatterHandlerImpl) Split() error {
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var reader *bufio.Reader
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var err error
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if f.originalFilename == "-" {
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reader = bufio.NewReader(os.Stdin)
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} else {
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file, err := os.Open(f.originalFilename) // #nosec
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if err != nil {
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return err
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}
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reader = bufio.NewReader(file)
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}
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f.contentReader = reader
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yamlTempFile, err := createTempFile()
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if err != nil {
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return err
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}
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f.yamlFrontMatterFilename = yamlTempFile.Name()
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log.Debug("yamlTempFile: %v", yamlTempFile.Name())
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lineCount := 0
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for {
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peekBytes, err := reader.Peek(3)
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if err == io.EOF {
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// we've finished reading the yaml content..I guess
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break
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} else if err != nil {
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return err
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}
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if lineCount > 0 && string(peekBytes) == "---" {
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// we've finished reading the yaml content..
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break
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}
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line, errReading := reader.ReadString('\n')
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lineCount = lineCount + 1
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if errReading != nil && errReading != io.EOF {
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return errReading
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}
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_, errWriting := yamlTempFile.Write([]byte(line))
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if errWriting != nil {
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return errWriting
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}
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}
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safelyCloseFile(yamlTempFile)
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return nil
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}
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