func instrumentFiles()

in tools/go-agent/instrument/instrument.go [103:152]
42 lines of code
10 McCabe index (conditional complexity)

func instrumentFiles(buildDir string, inst api.Instrument, args []string) error {
	// parse files
	parsedFiles, err := parseFilesInArgs(args)
	if err != nil {
		return err
	}

	allFiles := make([]*dst.File, 0)
	for _, f := range parsedFiles {
		allFiles = append(allFiles, f.dstFile)
	}

	// filter and edit the files
	instrumentedFiles := make([]string, 0)
	for path, info := range parsedFiles {
		hasInstruted := false
		dstutil.Apply(info.dstFile, func(cursor *dstutil.Cursor) bool {
			if inst.FilterAndEdit(path, info.dstFile, cursor, allFiles) {
				hasInstruted = true
			}
			return true
		}, func(cursor *dstutil.Cursor) bool {
			return true
		})

		if hasInstruted {
			instrumentedFiles = append(instrumentedFiles, path)
		}
	}

	// write instrumented files to the build directory
	for _, updateFileSrc := range instrumentedFiles {
		info := parsedFiles[updateFileSrc]
		filename := filepath.Base(updateFileSrc)
		dest := filepath.Join(buildDir, filename)
		debugInfo, err := tools.BuildDSTDebugInfo(updateFileSrc, nil)
		if err != nil {
			return err
		}
		if err := tools.WriteDSTFile(dest, info.dstFile, debugInfo); err != nil {
			return err
		}
		if err := inst.AfterEnhanceFile(updateFileSrc, dest); err != nil {
			return err
		}
		args[info.argsIndex] = dest
	}

	return nil
}