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#include "line/line_editor.h"
#include <print>
#include <iostream>
#include <string>
#include <unistd.h>
#include <cstdio>
#include <cstdlib>
#include <termios.h>
#include <sys/ioctl.h>
#include "history.h"
using namespace std;
namespace ov4
{
void T_line_editor::print_override(const std::string &s)
{
check_window_update();
// save current cursor position
// print("\x1b[s"); fflush(stdout);
// WTF
// ESC 7 Save Cursor (DECSC), VT100.
print("\x1b" "7"); fflush(stdout);
cursor_skip_prompt();
// erase rest of the line
print("\x1b[K"); fflush(stdout);
print("{}", s.substr(get_buffer_index_display_begin(),
get_buffer_index_display_end() - get_buffer_index_display_begin() + 1)); fflush(stdout);
//line_end_pos = s.size()+1;
// restore cursor position
// ESC 8 Restore Cursor (DECRC), VT100.
print("\x1b" "8"); fflush(stdout);
}
void T_line_editor::move_cursor(char c)
{
check_window_update();
switch (c)
{
case 'A':
switch_history(T_cursor_movement_direction::UP);
break;
case 'B':
switch_history(T_cursor_movement_direction::DOWN);
break;
case 'C':
move_cursor(T_cursor_movement_direction::RIGHT);
break;
case 'D':
move_cursor(T_cursor_movement_direction::LEFT);
break;
default:
return;
}
}
void T_line_editor::cursor_input_char(char c)
{
check_window_update();
// if receives any input
// it should move to the latest history
history_index = get_last_index();
// normal input
if (c != '\b' && c != '\x7f')
{
line_buffer.insert(buffer_index_cursor, 1, c);
move_cursor(T_cursor_movement_direction::RIGHT);
return;
}
// BACKSPACE
if (buffer_index_cursor != 0)
{
line_buffer.erase(buffer_index_cursor-1, 1);
move_cursor(T_cursor_movement_direction::LEFT);
}
else
{
print("\a"); fflush(stdout);
}
}
void T_line_editor::update_window_size()
{
winsize ws;
if (ioctl(1, TIOCGWINSZ, &ws) == -1)
editor_exit(-1); // TODO: fix
window_size_row = ws.ws_row;
window_size_col = ws.ws_col;
}
void T_line_editor::move_cursor(T_cursor_movement_direction d)
{
check_window_update();
switch (d)
{
case T_cursor_movement_direction::LEFT:
// if cursor is not at left margin
if (prompt_pos+1 < get_terminal_pos_cursor())
{
buffer_index_cursor--;
print("\x1b[D"); fflush(stdout); // move cursor to the left
}
// margin
else
{
// already at the beginning of buffer
if (buffer_index_cursor == 0)
{
print("\a"); fflush(stdout);
break;
}
buffer_index_cursor--;
_buffer_index_display_begin--;
print_override(line_buffer);
}
break;
case T_cursor_movement_direction::RIGHT:
// if cursor is not at right margin
if (window_size_col > get_terminal_pos_cursor())
{
// already at the end of buffer
if (buffer_index_cursor == line_buffer.size())
{
print("\a"); fflush(stdout);
break;
}
buffer_index_cursor++;
print("\x1b[C"); fflush(stdout); // move cursor to the right
}
// margin
else
{
// already at the end of buffer
if (buffer_index_cursor == line_buffer.size())
{
print("\a"); fflush(stdout);
break;
}
buffer_index_cursor++;
_buffer_index_display_begin++;
print_override(line_buffer);
}
break;
default:
editor_exit(-1); // TODO: fix
}
}
void T_line_editor::switch_history(T_cursor_movement_direction d)
{
check_window_update();
switch (d)
{
case T_cursor_movement_direction::UP:
if (history_index == 0)
{
print("\a"); fflush(stdout);
}
else
{
history_index--;
reset_editor();
line_buffer = history_vec[history_index];
print_override(line_buffer);
}
break;
case T_cursor_movement_direction::DOWN:
if (history_index == get_last_index())
{
print("\a"); fflush(stdout);
}
else
{
history_index++;
reset_editor();
line_buffer = history_vec[history_index];
print_override(line_buffer);
}
break;
default:
editor_exit(-1); // TODO: fix
}
}
void T_line_editor::reset_editor()
{
line_buffer = "";
buffer_index_cursor = 0;
_buffer_index_display_begin = 0;
cursor_skip_prompt();
}
void T_line_editor::cursor_skip_prompt()
{
// move to the "start" of the zone
// should skip prompt zone
print("\r\x1b[{}C", prompt_pos-1); fflush(stdout);
}
void T_line_editor::check_window_update()
{
if (windows_size_changed)
{
update_window_size();
clear_below();
windows_size_changed = false;
}
}
}
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