77 lines
2.5 KiB
Go
77 lines
2.5 KiB
Go
// Fenrir console screen reader.
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// Copyright (c) 2026 Storm Dragon
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// SPDX-License-Identifier: GPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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// more details.
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//
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// You should have received a copy of the GNU General Public License along with
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// this program. If not, see <https://www.gnu.org/licenses/gpl-3.0.html>.
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//go:build linux && cgo
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package terminal
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/*
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#include "native.h"
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*/
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import "C"
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import (
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"fmt"
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"unsafe"
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"git.stormux.org/storm/fenrir/internal/screen"
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)
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type Emulator struct {
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native *C.VTerm
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rows, cols int
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}
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func new_emulator(rows, cols int) (*Emulator, error) {
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if !valid_size(rows, cols) {
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return nil, fmt.Errorf("unsupported terminal geometry %dx%d", cols, rows)
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}
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vt := C.terminal_vterm(C.int(rows), C.int(cols))
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if vt == nil {
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return nil, fmt.Errorf("allocate terminal emulator")
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}
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return &Emulator{native: vt, rows: rows, cols: cols}, nil
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}
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func (e *Emulator) close() { C.terminal_vterm_free(e.native) }
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func (e *Emulator) feed(bytes []byte) {
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if len(bytes) == 0 {
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return
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}
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C.vterm_input_write(e.native, (*C.char)(unsafe.Pointer(&bytes[0])), C.size_t(len(bytes)))
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// The outer terminal answers queries. Discard duplicate emulator replies.
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var discard [4096]byte
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for C.vterm_output_read(e.native, (*C.char)(unsafe.Pointer(&discard[0])), C.size_t(len(discard))) > 0 {
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}
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}
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func (e *Emulator) resize(rows, cols int) {
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C.vterm_set_size(e.native, C.int(rows), C.int(cols))
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e.rows, e.cols = rows, cols
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}
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func (e *Emulator) snapshot(active, lock bool) screen.Snapshot {
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snapshot := screen.Snapshot{Terminal: 1, Active: active, NumLock: lock, Rows: e.rows, Cols: e.cols, Cells: make([]rune, e.rows*e.cols)}
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snapshot.Generation = uint64(C.terminal_generation(e.native))
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snapshot.Attributes = make([]screen.Attribute, len(snapshot.Cells))
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var x, y C.int
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C.terminal_cells(e.native, (*C.uint32_t)(unsafe.Pointer(&snapshot.Cells[0])), (*C.TerminalAttribute)(unsafe.Pointer(&snapshot.Attributes[0])), C.int(len(snapshot.Cells)), &x, &y)
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snapshot.X, snapshot.Y = min(int(x), e.cols-1), min(int(y), e.rows-1)
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return snapshot
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}
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