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filter_swapextensions.go
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// 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.
//
// * Neither the names of the copyright holders nor the names of his
// 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
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package scriptish
import (
"path/filepath"
"strings"
)
// SwapExtensions treats every line in the pipeline as a filepath.
//
// It replaces every old extension with the corresponding new one.
func SwapExtensions(old []string, new []string, opts ...*StepOption) *SequenceStep {
// build our Scriptish command
return NewSequenceStep(
func(p *Pipe) (int, error) {
// debugging support
Tracef("SwapExtensions(%#v, %#v)", old, new)
// special case - we want to replace *every extension* in old with
// whatever is in new
if len(old) > 1 && len(new) == 1 {
for i := 1; i < len(old); i++ {
new = append(new, new[0])
}
} else if len(old) != len(new) {
// we don't know what to do
return StatusNotOkay, ErrMismatchedInputs{"old", len(old), "new", len(new)}
}
for line := range p.Stdin.ReadLines() {
// what extension does this filepath have?
fileExt := filepath.Ext(line)
swapped := false
for i := range old {
if fileExt == old[i] {
// remove it
newFilepath := strings.TrimSuffix(line, fileExt) + new[i]
// pass it on
TracePipeStdout("%s", newFilepath)
p.Stdout.WriteString(newFilepath)
p.Stdout.WriteRune('\n')
// this helps us make sure that we do not output
// the same filepath twice
swapped = true
// once an extension has been swapped, we do not want
// to try and swap it a second time
break
}
}
// did we swap anything over?
if !swapped {
TracePipeStdout("%s", line)
p.Stdout.WriteString(line)
p.Stdout.WriteRune('\n')
}
}
// all done
return StatusOkay, nil
},
opts...,
)
}