mirror of
https://github.com/lihop/godot-xterm.git
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108 lines
2.4 KiB
GDScript
108 lines
2.4 KiB
GDScript
# Copyright (c) 2021, Leroy Hopson (MIT License).
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tool
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extends Reference
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const KeyCodes = {
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ESCAPE = "\u001b",
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ENTER = "\r",
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BACKSPACE = "\u0008",
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UP_ARROW = "\u001b[A",
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DOWN_ARROW = "\u001b[B",
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LEFT_ARROW = "\u001b[D",
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RIGHT_ARROW = "\u001b[C",
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}
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var terminal
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var _prompt: String
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var _cursor_pos_min: int
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var _cursor_pos: int
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var _line: String
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func _init(p_terminal) -> void:
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terminal = p_terminal
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assert(terminal.has_method("write"))
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assert(terminal.has_signal("key_pressed"))
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assert("cols" in terminal)
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assert("rows" in terminal)
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func readline(prompt := "> ") -> String:
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_prompt = prompt
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_cursor_pos_min = prompt.length()
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_cursor_pos = prompt.length()
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terminal.write(_prompt)
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var input = yield(terminal, "key_pressed")
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while input[1].scancode != KEY_ENTER:
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print(input[0])
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match input[0]:
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KeyCodes.BACKSPACE:
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_backspace()
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KeyCodes.UP_ARROW:
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# TODO: History prev.
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pass
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KeyCodes.DOWN_ARROW:
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# TODO: History next.
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pass
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KeyCodes.LEFT_ARROW, KeyCodes.RIGHT_ARROW:
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# TODO: Implement Me!
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pass
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_:
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terminal.write(input[0])
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_line += input[0]
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_cursor_pos += 1
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if _cursor_pos > 0 and _cursor_pos % int(terminal.cols) == 0:
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terminal.write("\u001bE")
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input = yield(terminal, "key_pressed")
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return _line
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func _backspace() -> void:
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if _cursor_pos > _cursor_pos_min:
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if _cursor_pos % int(terminal.cols) == 0:
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terminal.write("\u001b[1A\u001b[%dC\u001b[K" % terminal.cols)
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else:
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terminal.write("\b \b")
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_line = _line.substr(0, _cursor_pos - _cursor_pos_min - 1)
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_cursor_pos -= 1
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func _refresh_line() -> void:
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var num_rows := ceil(_cursor_pos / terminal.cols)
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for _row in range(num_rows):
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terminal.write("\r\u001b[2K\u001b[1A")
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terminal.write("\r\u001b[1B%s%s" % [_prompt, _line])
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_cursor_pos = _prompt.length()
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_cursor_pos += _line.length()
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## TODO
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#func _add_history(line: String) -> void:
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# _history.append(line)
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#
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#
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## TODO
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#func _load_history(filepath) -> int:
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# var file := File.new()
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# var err := file.open(filepath, File.READ)
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# if err == OK:
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# var line := file.get_line()
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# while line != "":
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# _history.append(line)
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# line = file.get_line()
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# file.close()
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# return err
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#
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#
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## TODO
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#func _save_history(filepath) -> int:
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# var file := File.new()
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# var err := file.open(filepath, File.WRITE)
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# if err == OK:
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# for line in _history:
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# assert(line is String)
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# file.store_line(line)
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# file.close()
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# return err
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