Velocity/lambda

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2022-03-14 07:21:55 +00:00
#!/usr/bin/python
import os
import curses
from core import colors, cursor
from modes import normal
def start_screen(stdscr):
# Get window height and width
height, width = stdscr.getmaxyx()
# Startup text
title = "λ Lambda"
subtext = [
"A performant, efficient and hackable text editor",
"",
"Type :h to open the README.md document",
"Type :o <file> to open a file and edit",
"Type :q or <C-c> to quit lambda"
]
# Centering calculations
start_x_title = int((width // 2) - (len(title) // 2) - len(title) % 2)
start_y = int((height // 2) - 2)
# Rendering title
stdscr.addstr(start_y, start_x_title, title, curses.color_pair(7) | curses.A_BOLD)
# Print the subtext
for text in subtext:
start_y += 1
start_x = int((width // 2) - (len(text) // 2) - len(text) % 2)
stdscr.addstr(start_y, start_x, text)
def start(stdscr):
# Initialise data before starting
data = {"cursor_y": 0, "cursor_x": 0, "commands": []}
# Clear and refresh the screen for a blank canvas
stdscr.clear()
stdscr.refresh()
# Initialise colors
colors.init_colors()
# Load the start screen
start_screen(stdscr)
# Change the cursor shape
cursor.cursor_mode("block")
# Main loop
while True:
# Get the height and width of the screen
height, width = stdscr.getmaxyx()
# Activate normal mode
data = normal.activate(stdscr, height, width, data)
# Calculate a valid cursor position from data
cursor_x = max(2, data["cursor_x"])
cursor_x = min(width - 1, cursor_x)
cursor_y = max(0, data["cursor_y"])
cursor_y = min(height - 3, cursor_y)
# Move the cursor
stdscr.move(cursor_y, cursor_x)
# Refresh and clear the screen
stdscr.refresh()
stdscr.clear()
def main():
# Change the escape delay to 25ms
# Fixes an issue where esc takes too long to press
os.environ.setdefault("ESCDELAY", "25")
# Initialise the screen
curses.wrapper(start)
if __name__ == "__main__":
main()