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@ -71,18 +71,27 @@ pub fn coords_at_pos(text: RopeSlice, pos: usize) -> Position {
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/// Convert (line, column) coordinates to a character index.
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///
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/// `is_1_width` specifies whether the position should be treated
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/// as a block cursor or not. This effects how line-ends are handled.
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/// `false` corresponds to properly round-tripping with `coords_at_pos()`,
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/// whereas `true` will ensure that block cursors don't jump off the
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/// end of the line.
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/// If the `line` coordinate is beyond the end of the file, the EOF
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/// position will be returned.
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///
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/// If the `column` coordinate is past the end of the given line, the
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/// line-end position will be returned. What constitutes the "line-end
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/// position" depends on the parameter `limit_before_line_ending`. If it's
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/// `true`, the line-end position will be just *before* the line ending
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/// character. If `false` it will be just *after* the line ending
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/// character--on the border between the current line and the next.
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///
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/// Usually you only want `limit_before_line_ending` to be `true` if you're working
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/// with left-side block-cursor positions, as this prevents the the block cursor
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/// from jumping to the next line. Otherwise you typically want it to be `false`,
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/// such as when dealing with raw anchor/head positions.
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///
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/// TODO: this should be changed to work in terms of visual row/column, not
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/// graphemes.
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pub fn pos_at_coords(text: RopeSlice, coords: Position, is_1_width: bool) -> usize {
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pub fn pos_at_coords(text: RopeSlice, coords: Position, limit_before_line_ending: bool) -> usize {
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let Position { row, col } = coords;
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let line_start = text.line_to_char(row);
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let line_end = if is_1_width {
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let line_end = if limit_before_line_ending {
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line_end_char_index(&text, row)
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} else {
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text.line_to_char((row + 1).min(text.len_lines()))
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