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77 lines
2.7 KiB
77 lines
2.7 KiB
"""Rendering Gemtext in curses."""
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import curses
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from bebop.colors import A_ITALIC, ColorPair
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from bebop.metalines import LineType
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def render_lines(metalines, window, max_width):
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"""Write a list of metalines in window.
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As this function does not know about the window/pad previous size, it
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expects a cleared window, especially if the new content is shorter than the
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previous one: merely clearing after the resize will not remove artefacts.
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Arguments:
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- metalines: list of metalines to render, must have at least one element.
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- window: window that will be resized and filled with rendered lines.
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- max_width: line length limit for the pad.
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Returns:
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The tuple of integers (height, width), the new dimensions of the resized
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window.
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"""
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num_lines = len(metalines)
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new_dimensions = max(num_lines, 1), max_width
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window.resize(*new_dimensions)
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for line_index, metaline in enumerate(metalines):
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try:
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render_line(metaline, window, max_width)
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except ValueError:
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return new_dimensions
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if line_index < num_lines - 1:
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window.addstr("\n")
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return new_dimensions
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def render_line(metaline, window, max_width):
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"""Write a single line to the window."""
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meta, line = metaline
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line_type = meta["type"]
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attributes = get_base_line_attributes(line_type)
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line = line[:max_width - 1]
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window.addstr(line, attributes)
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if meta["type"] == LineType.LINK and "url" in meta:
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url_text = f' {meta["url"]}'
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attributes = (
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curses.color_pair(ColorPair.LINK_PREVIEW)
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| curses.A_DIM
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| A_ITALIC
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)
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window.addstr(url_text, attributes)
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def get_base_line_attributes(line_type) -> int:
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"""Return the base attributes for this line type.
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Other attributes may be freely used later for this line type but this is
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what is used at the start of most lines of the given type.
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"""
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if line_type == LineType.TITLE_1:
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return curses.color_pair(ColorPair.TITLE_1) | curses.A_BOLD
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elif line_type == LineType.TITLE_2:
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return curses.color_pair(ColorPair.TITLE_2) | curses.A_BOLD
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elif line_type == LineType.TITLE_3:
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return curses.color_pair(ColorPair.TITLE_3)
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elif line_type == LineType.LINK:
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return curses.color_pair(ColorPair.LINK)
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elif line_type == LineType.PREFORMATTED:
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return curses.color_pair(ColorPair.PREFORMATTED)
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elif line_type == LineType.BLOCKQUOTE:
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return curses.color_pair(ColorPair.BLOCKQUOTE) | A_ITALIC
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elif line_type == LineType.ERROR:
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return curses.color_pair(ColorPair.ERROR) | curses.A_BOLD
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else: # includes LineType.PARAGRAPH
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return curses.color_pair(ColorPair.NORMAL)
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