110 lines
3.3 KiB
Python
110 lines
3.3 KiB
Python
import curses
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import sys
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def clear(instance, y: int, x: int):
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# Clear the line at the screen at position y, x
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instance.screen.insstr(y, x, " " * (instance.width - x))
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def welcome(screen):
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# Get window height and width
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height, width = screen.getmaxyx()
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# Startup text
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title = "λ Lambda"
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subtext = [
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"Next generation hackable text editor for nerds",
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"",
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"Type :h to open the README.md document",
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"Type :o <file> to open a file and edit",
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"Type :q or <C-c> to quit lambda.py"
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]
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# Centering calculations
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start_x_title = int((width // 2) - (len(title) // 2) - len(title) % 2)
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start_y = int((height // 2) - 2)
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# Rendering title
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screen.addstr(start_y, start_x_title, title, curses.color_pair(7) | curses.A_BOLD)
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# Print the subtext
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for text in subtext:
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start_y += 1
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start_x = int((width // 2) - (len(text) // 2) - len(text) % 2)
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screen.addstr(start_y, start_x, text)
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def prompt(instance, message: str, color: int = 1) -> (list, None):
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# Initialise the input list
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inp = []
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# Write the message to the screen
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instance.screen.addstr(instance.height - 1, 0, message, curses.color_pair(color))
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while True:
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# Wait for a keypress
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key = instance.screen.getch()
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# Subtracting a key (backspace)
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if key in (curses.KEY_BACKSPACE, 127, '\b'):
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# Write whitespace over characters to refresh it
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clear(instance, instance.height - 1, 0)
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if inp:
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# Subtract a character from the input list
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inp.pop()
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else:
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# Exit the prompt without returning the input
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return None
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elif key == 27:
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# Exit the prompt, without returning the input
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return None
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elif key in (curses.KEY_ENTER, ord('\n'), ord('\r'), ord(":"), ord(";")):
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# Return the input list
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return inp
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else:
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# If any other key is typed, append it
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# As long as the key is in the valid list
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valid = "abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ!"
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if chr(key) in valid and len(inp) < (instance.width - 2):
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inp.append(chr(key))
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# Write the message to the screen
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instance.screen.addstr(instance.height - 1, 0, message, curses.color_pair(color))
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# Join the input together for visibility on the screen
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input_text = "".join(inp)
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# Write the input text to the screen
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instance.screen.addstr(instance.height - 1, len(message), input_text)
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def goodbye(instance):
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choice = prompt(instance, "Really quit lambda? (y/n): ", 11)
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if choice and choice[0] == "y":
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curses.endwin()
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sys.exit()
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else:
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clear(instance, instance.height - 1, 0)
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def error(instance, message: str):
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# Parse the error message
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error_message = f"ERROR: {message}"
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# Write the entire message to the screen
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instance.screen.addstr(instance.height - 1, 0, f"ERROR: {message}", curses.color_pair(3))
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instance.screen.addstr(instance.height - 1, len(error_message) + 1, f"(press any key)")
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# Wait for a keypress
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instance.screen.getch()
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# Clear the bottom of the screen
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clear(instance, instance.height - 1, 0)
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