88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package console
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import (
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"errors"
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"io"
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"os"
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)
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var ErrNotAConsole = errors.New("provided file is not a console")
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type File interface {
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io.ReadWriteCloser
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// Fd returns its file descriptor
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Fd() uintptr
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// Name returns its file name
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Name() string
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}
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type Console interface {
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File
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// Resize resizes the console to the provided window size
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Resize(WinSize) error
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// ResizeFrom resizes the calling console to the size of the
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// provided console
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ResizeFrom(Console) error
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// SetRaw sets the console in raw mode
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SetRaw() error
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// DisableEcho disables echo on the console
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DisableEcho() error
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// Reset restores the console to its orignal state
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Reset() error
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// Size returns the window size of the console
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Size() (WinSize, error)
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}
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// WinSize specifies the window size of the console
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type WinSize struct {
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// Height of the console
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Height uint16
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// Width of the console
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Width uint16
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x uint16
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y uint16
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}
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// Current returns the current process' console
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func Current() (c Console) {
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var err error
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// Usually all three streams (stdin, stdout, and stderr)
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// are open to the same console, but some might be redirected,
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// so try all three.
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for _, s := range []*os.File{os.Stderr, os.Stdout, os.Stdin} {
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if c, err = ConsoleFromFile(s); err == nil {
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return c
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}
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}
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// One of the std streams should always be a console
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// for the design of this function.
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panic(err)
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}
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// ConsoleFromFile returns a console using the provided file
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// nolint:golint
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func ConsoleFromFile(f File) (Console, error) {
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if err := checkConsole(f); err != nil {
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return nil, err
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}
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return newMaster(f)
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}
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