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input_opts.go
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input_opts.go
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// Copyright 2021 MongoDB Inc
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cli
import (
"io"
"os"
"github.com/mattn/go-isatty"
)
type InputOpts struct {
InReader io.Reader
}
// InitInput allow to init the InputOpts in a functional way.
func (opts *InputOpts) InitInput(r io.Reader) func() error {
return func() error {
opts.InReader = r
return nil
}
}
// ConfigReader returns the io.Reader.
// If the reader is nil, it defaults to os.Stdin and caches it.
func (opts *InputOpts) ConfigReader() io.Reader {
if opts.InReader != nil {
return opts.InReader
}
opts.InReader = os.Stdin
return opts.InReader
}
// IsTerminalInput returns true is the current file descriptor is TTY kind of terminal.
func (opts *InputOpts) IsTerminalInput() bool {
return IsTerminalInput(opts.InReader)
}
// IsTerminalInput returns true is the current file descriptor is TTY kind of terminal.
func IsTerminalInput(r io.Reader) bool {
if f, isFile := r.(*os.File); isFile {
return isatty.IsTerminal(f.Fd()) || IsCygwinTerminalInput(r)
}
return false
}
// IsCygwinTerminalInput returns true is the current file descriptor is cygwin.
func (opts *InputOpts) IsCygwinTerminalInput() bool {
return IsCygwinTerminalInput(opts.InReader)
}
// IsCygwinTerminal returns true is the current file descriptor is cygwin.
func IsCygwinTerminalInput(r io.Reader) bool {
if f, isFile := r.(*os.File); isFile {
return isatty.IsCygwinTerminal(f.Fd())
}
return false
}