119 lines
3.4 KiB
Python
119 lines
3.4 KiB
Python
import argparse
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import curses
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import os
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from core import colors, cursors, buffers, modes, utils
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from core.buffers import Buffer
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from core.components import Components
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class Lambda:
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def __init__(self, buffer: Buffer = None, config: dict = None):
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self.cursor = [0, 0]
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self.raw_cursor = [0, 0]
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self.offset = [0, 0]
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self.height = 0
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self.width = 0
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self.safe_height = 0
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self.safe_width = 0
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self.mode = "normal"
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self.config = config or {"icon": "λ"}
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self.buffer = buffer or [""]
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self.screen = curses.initscr()
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self.components = Components(self)
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def update_dimensions(self):
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# Calculate the entire height and width of the terminal
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self.height, self.width = self.screen.getmaxyx()
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# Calculate the safe area for the buffer by removing heights & widths of components
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self.safe_height = self.height - len(self.components.components["bottom"]) - 2
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self.safe_width = self.width - self.components.get_component_width(self.components.components["left"]) - 1
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def refresh(self):
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# Calculate the cursor position in the file
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self.cursor[0], self.cursor[1] = self.raw_cursor[0] + self.offset[0], self.raw_cursor[1] + self.offset[1]
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# Update the dimensions of the terminal
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self.update_dimensions()
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# Write the buffer to the screen
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self.buffer.render(self)
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# Refresh the on-screen components
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self.components.render(self)
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# Move the cursor
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cursors.move(self)
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def start(self):
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# Change the escape key delay to 25ms
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# Fixes an issue where the "esc" key takes way too long to press
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os.environ.setdefault("ESCDELAY", "25")
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# Initialise colors
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colors.init_colors()
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# Change the cursor shape
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cursors.mode("block")
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# Don't echo any key-presses
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curses.noecho()
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# Show a welcome message if lambda opens with no file
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if not self.buffer.path:
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utils.welcome(self.screen)
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# Main loop
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self.run()
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def run(self):
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# The main loop, which runs until the user quits
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while True:
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# Update the screen variables
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self.refresh()
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# Wait for a keypress
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key = self.screen.getch()
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# Handle the key
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modes.handle_key(self, key)
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# Refresh and clear the screen
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self.screen.erase()
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def main():
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# Shell arguments
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parser = argparse.ArgumentParser(description="Next generation hackable text editor for nerds.")
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parser.add_argument("file", metavar="file", type=str, nargs="?",
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help="The name of a file for lambda to open")
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# Collect the arguments passed into lambda at the shell
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args = parser.parse_args()
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# Load the file into a Buffer object
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buffer = buffers.load_file(args.file)
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# Load the config
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config = utils.load_config()
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# Load lambda with the buffer object
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screen = Lambda(buffer, config)
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# Start the screen, this will loop until exit
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try:
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screen.start()
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# KeyboardInterrupt is thrown when <C-c> is pressed (exit)
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except KeyboardInterrupt:
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utils.gracefully_exit()
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# Excepts *any* errors that occur
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except Exception as exception:
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utils.fatal_error(exception)
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if __name__ == "__main__":
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main()
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