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56 lines
2.8 KiB
Go
56 lines
2.8 KiB
Go
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// Copyright 2021 The TCell Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use file except in compliance with the License.
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// You may obtain a copy of the license at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package tcell
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import "io"
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// Tty is an abstraction of a tty (traditionally "teletype"). This allows applications to
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// provide for alternate backends, as there are situations where the traditional /dev/tty
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// does not work, or where more flexible handling is required. This interface is for use
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// with the terminfo-style based API. It extends the io.ReadWriter API. It is reasonable
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// that the implementation might choose to use different underlying files for the Reader
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// and Writer sides of this API, as part of it's internal implementation.
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type Tty interface {
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// Start is used to activate the Tty for use. Upon return the terminal should be
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// in raw mode, non-blocking, etc. The implementation should take care of saving
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// any state that is required so that it may be restored when Stop is called.
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Start() error
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// Stop is used to stop using this Tty instance. This may be a suspend, so that other
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// terminal based applications can run in the foreground. Implementations should
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// restore any state collected at Start(), and return to ordinary blocking mode, etc.
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// Drain is called first to drain the input. Once this is called, no more Read
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// or Write calls will be made until Start is called again.
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Stop() error
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// Drain is called before Stop, and ensures that the reader will wake up appropriately
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// if it was blocked. This workaround is required for /dev/tty on certain UNIX systems
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// to ensure that Read() does not block forever. This typically arranges for the tty driver
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// to send data immediately (e.g. VMIN and VTIME both set zero) and sets a deadline on input.
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// Implementations may reasonably make this a no-op. There will still be control sequences
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// emitted between the time this is called, and when Stop is called.
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Drain() error
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// NotifyResize is used register a callback when the tty thinks the dimensions have
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// changed. The standard UNIX implementation links this to a handler for SIGWINCH.
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// If the supplied callback is nil, then any handler should be unregistered.
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NotifyResize(cb func())
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// WindowSize is called to determine the terminal dimensions. This might be determined
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// by an ioctl or other means.
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WindowSize() (width int, height int, err error)
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io.ReadWriteCloser
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}
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