filter_xargsrmfile.go

// scriptish is a library to help you port bash scripts to Golang
//
// inspired by:
//
// - http://labix.org/pipe
// - https://github.com/bitfield/script
//
// Copyright 2019-present Ganbaro Digital Ltd
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//   * Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
//
//   * Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in
//     the documentation and/or other materials provided with the
//     distribution.
//
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//     contributors may be used to endorse or promote products derived
//     from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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package scriptish

import (
	"os"
)

// XargsRmFile treats every line in the pipeline as a filename.
// It attempts to delete each file.
//
// It stops at the first file that cannot be deleted.
//
// Each successfully-deleted filepath is written to the pipeline's stdout,
// for use by the next command in the pipeline.
func XargsRmFile(opts ...*StepOption) *SequenceStep {
	// build our Scriptish command
	return NewSequenceStep(
		func(p *Pipe) (int, error) {
			// debugging support
			Tracef("XargsRmFile()")

			for line := range p.Stdin.ReadLines() {
				err := os.Remove(line)
				if err != nil {
					return StatusNotOkay, err
				}

				// pass it on, in case the next item in the pipeline
				// can use it
				TracePipeStdout("%s", line)
				p.Stdout.WriteString(line)
				p.Stdout.WriteRune('\n')
			}

			// all done
			return StatusOkay, nil
		},
		opts...,
	)
}