689 lines
24 KiB
C++
689 lines
24 KiB
C++
/*
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* terminal.hpp
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* MontaukOS terminal emulator with ANSI escape sequence support
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* Copyright (c) 2026 Daniel Hammer
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*/
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#pragma once
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#include "gui/gui.hpp"
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#include "gui/font.hpp"
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#include <montauk/syscall.h>
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#include <montauk/string.h>
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#include <Api/Syscall.hpp>
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namespace gui {
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struct TermCell {
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char ch;
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Color fg;
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Color bg;
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};
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static constexpr int TERM_MAX_SCROLLBACK = 500;
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struct TerminalState {
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TermCell* cells;
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TermCell* alt_cells; // alternate screen buffer
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int cols, rows;
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int cursor_x, cursor_y;
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int saved_cursor_x, saved_cursor_y; // saved cursor for alternate screen
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int scrollback_lines; // lines of history above visible screen (0..max_scrollback)
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int max_scrollback; // 0 for viewers (klog), TERM_MAX_SCROLLBACK for terminal
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int view_offset; // how many rows scrolled back (0 = live view)
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int child_pid;
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void* desktop; // DesktopState* for closing window on child exit
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Color current_fg;
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Color current_bg;
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bool cursor_visible;
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bool alt_screen_active;
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bool reverse_video;
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bool dirty; // true when content changed since last render
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enum { STATE_NORMAL, STATE_ESC, STATE_CSI } parse_state;
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bool csi_private; // true if '?' was seen after CSI
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int csi_params[8];
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int csi_param_count;
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int csi_current_param;
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};
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// Standard ANSI color palette as ARGB pixels
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static inline Color term_ansi_color(int idx) {
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switch (idx) {
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case 0: return Color::from_hex(0x000000);
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case 1: return Color::from_hex(0xCC0000);
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case 2: return Color::from_hex(0x4E9A06);
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case 3: return Color::from_hex(0xC4A000);
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case 4: return Color::from_hex(0x3465A4);
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case 5: return Color::from_hex(0x75507B);
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case 6: return Color::from_hex(0x06989A);
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case 7: return Color::from_hex(0xD3D7CF);
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case 8: return Color::from_hex(0x555753);
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case 9: return Color::from_hex(0xEF2929);
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case 10: return Color::from_hex(0x8AE234);
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case 11: return Color::from_hex(0xFCE94F);
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case 12: return Color::from_hex(0x729FCF);
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case 13: return Color::from_hex(0xAD7FA8);
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case 14: return Color::from_hex(0x34E2E2);
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case 15: return Color::from_hex(0xEEEEEC);
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default: return colors::TERM_FG;
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}
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}
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// Helper: pointer to start of screen-relative row r in the cells buffer
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static inline TermCell* term_screen_row(TerminalState* t, int r) {
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return &t->cells[(t->scrollback_lines + r) * t->cols];
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}
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static inline void terminal_scroll_up(TerminalState* t) {
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if (!t->alt_screen_active && t->scrollback_lines < t->max_scrollback) {
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// Room for scrollback: top visible row becomes scrollback, no data movement
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t->scrollback_lines++;
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} else if (!t->alt_screen_active && t->max_scrollback > 0) {
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// Scrollback full: discard oldest line, shift entire buffer up by one row
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int total = (t->max_scrollback + t->rows - 1) * t->cols * sizeof(TermCell);
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montauk::memmove(t->cells, t->cells + t->cols, total);
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} else {
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// Alt screen or no scrollback (klog): shift visible area up
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TermCell* screen = term_screen_row(t, 0);
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montauk::memmove(screen, screen + t->cols, (t->rows - 1) * t->cols * sizeof(TermCell));
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}
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// Clear the new bottom visible row
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TermCell* bottom = term_screen_row(t, t->rows - 1);
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for (int c = 0; c < t->cols; c++) {
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bottom[c] = {' ', t->current_fg, colors::TERM_BG};
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}
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// Keep user's scrolled-back viewport stable
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if (t->view_offset > 0) {
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t->view_offset++;
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if (t->view_offset > t->scrollback_lines)
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t->view_offset = t->scrollback_lines;
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}
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}
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// Initialize only the cell grid (no child process). Used by viewers like klog.
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// max_sb = 0 for viewers, TERM_MAX_SCROLLBACK for the real terminal.
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static inline void terminal_init_cells(TerminalState* t, int cols, int rows, int max_sb = 0) {
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t->cols = cols;
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t->rows = rows;
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t->cursor_x = 0;
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t->cursor_y = 0;
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t->saved_cursor_x = 0;
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t->saved_cursor_y = 0;
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t->scrollback_lines = 0;
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t->max_scrollback = max_sb;
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t->view_offset = 0;
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t->current_fg = colors::TERM_FG;
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t->current_bg = colors::TERM_BG;
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t->cursor_visible = false;
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t->alt_screen_active = false;
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t->reverse_video = false;
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t->dirty = true;
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t->parse_state = TerminalState::STATE_NORMAL;
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t->csi_private = false;
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t->csi_param_count = 0;
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t->csi_current_param = 0;
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t->child_pid = 0;
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int total_cells = (rows + max_sb) * cols;
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int screen_cells = rows * cols;
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t->cells = (TermCell*)montauk::alloc(total_cells * sizeof(TermCell));
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t->alt_cells = (TermCell*)montauk::alloc(screen_cells * sizeof(TermCell));
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if (!t->cells || !t->alt_cells) {
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// Allocation failed — leave terminal in a safe but unusable state
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if (t->cells) { montauk::free(t->cells); t->cells = nullptr; }
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if (t->alt_cells) { montauk::free(t->alt_cells); t->alt_cells = nullptr; }
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t->cols = 0; t->rows = 0;
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return;
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}
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for (int i = 0; i < total_cells; i++) {
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t->cells[i] = {' ', colors::TERM_FG, colors::TERM_BG};
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}
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for (int i = 0; i < screen_cells; i++) {
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t->alt_cells[i] = {' ', colors::TERM_FG, colors::TERM_BG};
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}
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}
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static inline void terminal_init(TerminalState* t, int cols, int rows) {
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terminal_init_cells(t, cols, rows, TERM_MAX_SCROLLBACK);
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t->cursor_visible = true;
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t->child_pid = montauk::spawn_redir("0:/os/shell.elf");
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if (t->child_pid > 0)
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montauk::childio_settermsz(t->child_pid, cols, rows);
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}
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static inline void terminal_put_char(TerminalState* t, char ch) {
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if (t->cursor_x >= t->cols) {
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t->cursor_x = 0;
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t->cursor_y++;
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}
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if (t->cursor_y >= t->rows) {
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terminal_scroll_up(t);
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t->cursor_y = t->rows - 1;
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}
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TermCell* row = term_screen_row(t, t->cursor_y);
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row[t->cursor_x].ch = ch;
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row[t->cursor_x].fg = t->current_fg;
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row[t->cursor_x].bg = t->current_bg;
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t->cursor_x++;
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}
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static inline void terminal_enter_alt_screen(TerminalState* t) {
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if (t->alt_screen_active) return;
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t->alt_screen_active = true;
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t->dirty = true;
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// Save cursor
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t->saved_cursor_x = t->cursor_x;
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t->saved_cursor_y = t->cursor_y;
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// Save visible screen to alt_cells, clear visible screen
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int total = t->cols * t->rows;
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TermCell* screen = term_screen_row(t, 0);
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for (int i = 0; i < total; i++) {
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t->alt_cells[i] = screen[i];
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screen[i] = {' ', colors::TERM_FG, colors::TERM_BG};
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}
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t->view_offset = 0;
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t->cursor_x = 0;
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t->cursor_y = 0;
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}
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static inline void terminal_exit_alt_screen(TerminalState* t) {
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if (!t->alt_screen_active) return;
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t->alt_screen_active = false;
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t->dirty = true;
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// Restore visible screen from alt_cells
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int total = t->cols * t->rows;
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TermCell* screen = term_screen_row(t, 0);
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for (int i = 0; i < total; i++) {
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screen[i] = t->alt_cells[i];
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}
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// Restore cursor
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t->cursor_x = t->saved_cursor_x;
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t->cursor_y = t->saved_cursor_y;
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}
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static inline void terminal_process_private_mode(TerminalState* t, char cmd) {
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int p0 = t->csi_param_count > 0 ? t->csi_params[0] : 0;
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if (cmd == 'h') {
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// Set private mode
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if (p0 == 25) {
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t->cursor_visible = true;
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} else if (p0 == 1049) {
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terminal_enter_alt_screen(t);
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}
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} else if (cmd == 'l') {
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// Reset private mode
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if (p0 == 25) {
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t->cursor_visible = false;
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} else if (p0 == 1049) {
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terminal_exit_alt_screen(t);
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}
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}
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}
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static inline void terminal_process_csi(TerminalState* t, char cmd) {
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// Finalize current param
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if (t->csi_param_count < 8) {
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t->csi_params[t->csi_param_count] = t->csi_current_param;
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t->csi_param_count++;
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}
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// Handle private mode sequences (ESC[?...)
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if (t->csi_private) {
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terminal_process_private_mode(t, cmd);
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return;
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}
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int p0 = t->csi_param_count > 0 ? t->csi_params[0] : 0;
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int p1 = t->csi_param_count > 1 ? t->csi_params[1] : 0;
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switch (cmd) {
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case 'H': case 'f': {
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// Cursor position: ESC[row;colH (1-based)
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int row = (p0 > 0 ? p0 : 1) - 1;
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int col = (p1 > 0 ? p1 : 1) - 1;
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if (row < 0) row = 0;
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if (row >= t->rows) row = t->rows - 1;
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if (col < 0) col = 0;
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if (col >= t->cols) col = t->cols - 1;
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t->cursor_y = row;
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t->cursor_x = col;
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break;
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}
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case 'A': {
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// Cursor up
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int n = p0 > 0 ? p0 : 1;
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t->cursor_y -= n;
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if (t->cursor_y < 0) t->cursor_y = 0;
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break;
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}
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case 'B': {
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// Cursor down
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int n = p0 > 0 ? p0 : 1;
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t->cursor_y += n;
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if (t->cursor_y >= t->rows) t->cursor_y = t->rows - 1;
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break;
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}
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case 'C': {
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// Cursor forward
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int n = p0 > 0 ? p0 : 1;
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t->cursor_x += n;
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if (t->cursor_x >= t->cols) t->cursor_x = t->cols - 1;
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break;
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}
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case 'D': {
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// Cursor backward
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int n = p0 > 0 ? p0 : 1;
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t->cursor_x -= n;
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if (t->cursor_x < 0) t->cursor_x = 0;
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break;
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}
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case 'J': {
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// Erase in display
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if (p0 == 0) {
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// Clear from cursor to end
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TermCell* row = term_screen_row(t, t->cursor_y);
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for (int x = t->cursor_x; x < t->cols; x++)
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row[x] = {' ', t->current_fg, colors::TERM_BG};
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for (int r = t->cursor_y + 1; r < t->rows; r++) {
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TermCell* rp = term_screen_row(t, r);
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for (int c = 0; c < t->cols; c++)
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rp[c] = {' ', t->current_fg, colors::TERM_BG};
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}
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} else if (p0 == 1) {
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// Clear from start to cursor
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for (int r = 0; r < t->cursor_y; r++) {
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TermCell* rp = term_screen_row(t, r);
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for (int c = 0; c < t->cols; c++)
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rp[c] = {' ', t->current_fg, colors::TERM_BG};
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}
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TermCell* row = term_screen_row(t, t->cursor_y);
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for (int x = 0; x <= t->cursor_x; x++)
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row[x] = {' ', t->current_fg, colors::TERM_BG};
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} else if (p0 == 2) {
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// Clear entire screen
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for (int r = 0; r < t->rows; r++) {
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TermCell* rp = term_screen_row(t, r);
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for (int c = 0; c < t->cols; c++)
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rp[c] = {' ', t->current_fg, colors::TERM_BG};
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}
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t->cursor_x = 0;
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t->cursor_y = 0;
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}
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break;
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}
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case 'K': {
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// Erase in line
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int start = 0, end = t->cols;
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if (p0 == 0) { start = t->cursor_x; end = t->cols; }
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else if (p0 == 1) { start = 0; end = t->cursor_x + 1; }
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else if (p0 == 2) { start = 0; end = t->cols; }
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TermCell* row = term_screen_row(t, t->cursor_y);
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for (int x = start; x < end; x++)
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row[x] = {' ', t->current_fg, colors::TERM_BG};
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break;
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}
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case 'm': {
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// SGR - Set Graphics Rendition
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for (int i = 0; i < t->csi_param_count; i++) {
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int code = t->csi_params[i];
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if (code == 0) {
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t->current_fg = colors::TERM_FG;
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t->current_bg = colors::TERM_BG;
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t->reverse_video = false;
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} else if (code == 1) {
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// Bold: map to bright version of current color
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uint8_t r = t->current_fg.r;
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uint8_t g = t->current_fg.g;
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uint8_t b = t->current_fg.b;
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int add = 50;
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r = (r + add > 255) ? 255 : r + add;
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g = (g + add > 255) ? 255 : g + add;
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b = (b + add > 255) ? 255 : b + add;
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t->current_fg = Color::from_rgb(r, g, b);
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} else if (code == 2) {
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// Dim: darken current fg color
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t->current_fg.r = t->current_fg.r / 2;
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t->current_fg.g = t->current_fg.g / 2;
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t->current_fg.b = t->current_fg.b / 2;
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} else if (code == 7) {
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// Reverse video
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if (!t->reverse_video) {
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t->reverse_video = true;
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Color tmp = t->current_fg;
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t->current_fg = t->current_bg;
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t->current_bg = tmp;
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}
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} else if (code == 27) {
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// Reverse off
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if (t->reverse_video) {
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t->reverse_video = false;
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Color tmp = t->current_fg;
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t->current_fg = t->current_bg;
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t->current_bg = tmp;
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}
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} else if (code >= 30 && code <= 37) {
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t->current_fg = term_ansi_color(code - 30);
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if (t->reverse_video) {
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// In reverse mode, fg is displayed as bg
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Color tmp = t->current_fg;
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t->current_fg = t->current_bg;
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t->current_bg = tmp;
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}
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} else if (code >= 40 && code <= 47) {
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t->current_bg = term_ansi_color(code - 40);
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} else if (code >= 90 && code <= 97) {
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t->current_fg = term_ansi_color(code - 90 + 8);
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} else if (code >= 100 && code <= 107) {
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t->current_bg = term_ansi_color(code - 100 + 8);
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} else if (code == 39) {
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t->current_fg = colors::TERM_FG;
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} else if (code == 49) {
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t->current_bg = colors::TERM_BG;
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}
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}
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if (t->csi_param_count == 0) {
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// ESC[m with no params = reset
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t->current_fg = colors::TERM_FG;
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t->current_bg = colors::TERM_BG;
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t->reverse_video = false;
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}
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break;
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}
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default:
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break;
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}
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}
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static inline void terminal_feed(TerminalState* t, const char* data, int len) {
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if (len > 0) t->dirty = true;
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for (int i = 0; i < len; i++) {
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char ch = data[i];
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switch (t->parse_state) {
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case TerminalState::STATE_NORMAL:
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if (ch == '\033') {
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t->parse_state = TerminalState::STATE_ESC;
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} else if (ch == '\n') {
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t->cursor_x = 0; // CR+LF: shell sends \n without \r
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t->cursor_y++;
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if (t->cursor_y >= t->rows) {
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terminal_scroll_up(t);
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t->cursor_y = t->rows - 1;
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}
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} else if (ch == '\r') {
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t->cursor_x = 0;
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} else if (ch == '\b') {
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if (t->cursor_x > 0) t->cursor_x--;
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} else if (ch == '\t') {
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int next = (t->cursor_x + 8) & ~7;
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if (next > t->cols) next = t->cols;
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while (t->cursor_x < next) {
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terminal_put_char(t, ' ');
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}
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} else if (ch >= 32 || ch < 0) {
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// Printable character (also treat high-bit chars as printable)
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terminal_put_char(t, ch);
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}
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break;
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case TerminalState::STATE_ESC:
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if (ch == '[') {
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t->parse_state = TerminalState::STATE_CSI;
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t->csi_private = false;
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t->csi_param_count = 0;
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t->csi_current_param = 0;
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for (int j = 0; j < 8; j++) t->csi_params[j] = 0;
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} else if (ch == 'c') {
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// Reset terminal
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t->current_fg = colors::TERM_FG;
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t->current_bg = colors::TERM_BG;
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t->cursor_x = 0;
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t->cursor_y = 0;
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t->parse_state = TerminalState::STATE_NORMAL;
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} else {
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// Unknown ESC sequence, ignore
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t->parse_state = TerminalState::STATE_NORMAL;
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}
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break;
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case TerminalState::STATE_CSI:
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if (ch >= '0' && ch <= '9') {
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t->csi_current_param = t->csi_current_param * 10 + (ch - '0');
|
|
} else if (ch == ';') {
|
|
if (t->csi_param_count < 8) {
|
|
t->csi_params[t->csi_param_count] = t->csi_current_param;
|
|
t->csi_param_count++;
|
|
}
|
|
t->csi_current_param = 0;
|
|
} else if (ch == '?') {
|
|
t->csi_private = true;
|
|
} else if (ch >= 0x40 && ch <= 0x7E) {
|
|
// Final byte - execute command
|
|
terminal_process_csi(t, ch);
|
|
t->parse_state = TerminalState::STATE_NORMAL;
|
|
} else {
|
|
// Unknown, abort CSI
|
|
t->parse_state = TerminalState::STATE_NORMAL;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, int ph) {
|
|
if (!t->dirty || !t->cells) return;
|
|
t->dirty = false;
|
|
|
|
int cell_w = mono_cell_width();
|
|
int cell_h = mono_cell_height();
|
|
bool use_ttf = fonts::mono && fonts::mono->valid;
|
|
GlyphCache* gc = use_ttf ? fonts::mono->get_cache(fonts::TERM_SIZE) : nullptr;
|
|
|
|
// Fill background using row-copy: fill first row, then memcpy to the rest
|
|
uint32_t bg_px = colors::TERM_BG.to_pixel();
|
|
int row_bytes = pw * sizeof(uint32_t);
|
|
for (int i = 0; i < pw; i++) pixels[i] = bg_px;
|
|
for (int r = 1; r < ph; r++) {
|
|
montauk::memcpy(&pixels[r * pw], pixels, row_bytes);
|
|
}
|
|
|
|
// Determine which rows of the buffer to display
|
|
int base_row = t->scrollback_lines - t->view_offset;
|
|
if (base_row < 0) base_row = 0;
|
|
|
|
// Render each visible cell
|
|
int visible_rows = ph / cell_h;
|
|
int visible_cols = pw / cell_w;
|
|
if (visible_rows > t->rows) visible_rows = t->rows;
|
|
if (visible_cols > t->cols) visible_cols = t->cols;
|
|
|
|
for (int r = 0; r < visible_rows; r++) {
|
|
int py = r * cell_h;
|
|
int src_row = base_row + r;
|
|
for (int c = 0; c < visible_cols; c++) {
|
|
int idx = src_row * t->cols + c;
|
|
TermCell& cell = t->cells[idx];
|
|
|
|
int px = c * cell_w;
|
|
|
|
// Only draw cell background if it differs from terminal bg
|
|
uint32_t cell_bg = cell.bg.to_pixel();
|
|
if (cell_bg != bg_px) {
|
|
for (int fy = 0; fy < cell_h && py + fy < ph; fy++) {
|
|
uint32_t* row = &pixels[(py + fy) * pw + px];
|
|
for (int fx = 0; fx < cell_w && px + fx < pw; fx++) {
|
|
row[fx] = cell_bg;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Draw character glyph
|
|
if (cell.ch > 32 || cell.ch < 0) {
|
|
if (use_ttf) {
|
|
int baseline = py + gc->ascent;
|
|
fonts::mono->draw_char_to_buffer(pixels, pw, ph,
|
|
px, baseline, (unsigned char)cell.ch, cell.fg, gc);
|
|
} else {
|
|
uint32_t cell_fg = cell.fg.to_pixel();
|
|
const uint8_t* glyph = &font_data[(unsigned char)cell.ch * FONT_HEIGHT];
|
|
for (int fy = 0; fy < FONT_HEIGHT; fy++) {
|
|
int dy = py + fy;
|
|
if (dy >= ph) break;
|
|
uint8_t bits = glyph[fy];
|
|
for (int fx = 0; fx < FONT_WIDTH; fx++) {
|
|
if (bits & (0x80 >> fx)) {
|
|
int dx = px + fx;
|
|
if (dx >= pw) break;
|
|
pixels[dy * pw + dx] = cell_fg;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Draw cursor (only when viewing live position)
|
|
if (t->view_offset == 0 && t->cursor_visible &&
|
|
t->cursor_x < visible_cols && t->cursor_y < visible_rows) {
|
|
int cx = t->cursor_x * cell_w;
|
|
int cy = t->cursor_y * cell_h;
|
|
uint32_t cursor_px = colors::WHITE.to_pixel();
|
|
for (int fy = 0; fy < cell_h; fy++) {
|
|
int dy = cy + fy;
|
|
if (dy >= ph) break;
|
|
for (int fx = 0; fx < cell_w; fx++) {
|
|
int dx = cx + fx;
|
|
if (dx >= pw) break;
|
|
pixels[dy * pw + dx] = cursor_px;
|
|
}
|
|
}
|
|
// Draw character on top of cursor in black
|
|
if (t->cursor_y < t->rows && t->cursor_x < t->cols) {
|
|
TermCell* row = term_screen_row(t, t->cursor_y);
|
|
char ch = row[t->cursor_x].ch;
|
|
if (ch > 32 || ch < 0) {
|
|
if (use_ttf) {
|
|
int baseline = cy + gc->ascent;
|
|
fonts::mono->draw_char_to_buffer(pixels, pw, ph,
|
|
cx, baseline, (unsigned char)ch, colors::BLACK, gc);
|
|
} else {
|
|
const uint8_t* glyph = &font_data[(unsigned char)ch * FONT_HEIGHT];
|
|
uint32_t black_px = colors::BLACK.to_pixel();
|
|
for (int fy = 0; fy < FONT_HEIGHT; fy++) {
|
|
int dy = cy + fy;
|
|
if (dy >= ph) break;
|
|
uint8_t bits = glyph[fy];
|
|
for (int fx = 0; fx < FONT_WIDTH; fx++) {
|
|
if (bits & (0x80 >> fx)) {
|
|
int dx = cx + fx;
|
|
if (dx >= pw) break;
|
|
pixels[dy * pw + dx] = black_px;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void terminal_resize(TerminalState* t, int new_cols, int new_rows) {
|
|
if (new_cols == t->cols && new_rows == t->rows) return;
|
|
if (new_cols < 1 || new_rows < 1) return;
|
|
t->dirty = true;
|
|
|
|
int new_capacity = new_rows + t->max_scrollback;
|
|
int new_total = new_capacity * new_cols;
|
|
TermCell* new_cells = (TermCell*)montauk::alloc(new_total * sizeof(TermCell));
|
|
TermCell* new_alt = (TermCell*)montauk::alloc(new_rows * new_cols * sizeof(TermCell));
|
|
if (!new_cells || !new_alt) {
|
|
if (new_cells) montauk::free(new_cells);
|
|
if (new_alt) montauk::free(new_alt);
|
|
return; // keep existing buffers
|
|
}
|
|
|
|
// Clear new buffers
|
|
for (int i = 0; i < new_total; i++)
|
|
new_cells[i] = {' ', colors::TERM_FG, colors::TERM_BG};
|
|
for (int i = 0; i < new_rows * new_cols; i++)
|
|
new_alt[i] = {' ', colors::TERM_FG, colors::TERM_BG};
|
|
|
|
// Copy content: scrollback + visible screen
|
|
int old_content = t->scrollback_lines + t->rows;
|
|
int keep = old_content < new_capacity ? old_content : new_capacity;
|
|
int discard = old_content - keep;
|
|
int copy_cols = t->cols < new_cols ? t->cols : new_cols;
|
|
|
|
for (int r = 0; r < keep; r++) {
|
|
for (int c = 0; c < copy_cols; c++) {
|
|
new_cells[r * new_cols + c] = t->cells[(discard + r) * t->cols + c];
|
|
}
|
|
}
|
|
|
|
int new_scrollback = keep - new_rows;
|
|
if (new_scrollback < 0) new_scrollback = 0;
|
|
|
|
// Adjust cursor
|
|
int abs_cursor_y = t->scrollback_lines + t->cursor_y - discard;
|
|
int new_cursor_y = abs_cursor_y - new_scrollback;
|
|
if (new_cursor_y < 0) new_cursor_y = 0;
|
|
if (new_cursor_y >= new_rows) new_cursor_y = new_rows - 1;
|
|
int new_cursor_x = t->cursor_x < new_cols ? t->cursor_x : new_cols - 1;
|
|
|
|
if (t->cells) montauk::free(t->cells);
|
|
if (t->alt_cells) montauk::free(t->alt_cells);
|
|
|
|
t->cells = new_cells;
|
|
t->alt_cells = new_alt;
|
|
t->cols = new_cols;
|
|
t->rows = new_rows;
|
|
t->scrollback_lines = new_scrollback;
|
|
t->cursor_x = new_cursor_x;
|
|
t->cursor_y = new_cursor_y;
|
|
|
|
// Clamp view offset
|
|
if (t->view_offset > t->scrollback_lines)
|
|
t->view_offset = t->scrollback_lines;
|
|
|
|
// Notify child process of new terminal size
|
|
if (t->child_pid > 0) {
|
|
montauk::childio_settermsz(t->child_pid, new_cols, new_rows);
|
|
}
|
|
}
|
|
|
|
static inline void terminal_handle_key(TerminalState* t, const Montauk::KeyEvent& key) {
|
|
// Snap to live on any keyboard input
|
|
if (t->view_offset > 0) {
|
|
t->view_offset = 0;
|
|
t->dirty = true;
|
|
}
|
|
if (t->child_pid > 0) {
|
|
montauk::childio_writekey(t->child_pid, &key);
|
|
}
|
|
}
|
|
|
|
// Returns false if the child process has exited
|
|
static inline bool terminal_poll(TerminalState* t) {
|
|
if (t->child_pid <= 0) return false;
|
|
char buf[4096];
|
|
// Drain all available data so large output renders in one frame
|
|
for (;;) {
|
|
int n = montauk::childio_read(t->child_pid, buf, sizeof(buf));
|
|
if (n > 0) {
|
|
terminal_feed(t, buf, n);
|
|
} else {
|
|
// n == -1 means child process is gone; n == 0 means no data yet
|
|
if (n < 0) { t->child_pid = 0; return false; }
|
|
break;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
} // namespace gui
|