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79 lines
2.3 KiB
Rust
79 lines
2.3 KiB
Rust
use mlua::{AnyUserData, ExternalError, FromLua, IntoLua, Lua, Table, UserData, UserDataMethods, Value};
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use super::{Span, Style};
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const LEFT: u8 = 0;
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const CENTER: u8 = 1;
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const RIGHT: u8 = 2;
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#[derive(Clone, FromLua)]
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pub struct Line(pub(super) ratatui::text::Line<'static>);
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impl<'a> TryFrom<Table<'a>> for Line {
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type Error = mlua::Error;
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fn try_from(tbl: Table) -> Result<Self, Self::Error> {
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let seq: Vec<_> = tbl.sequence_values().filter_map(|v| v.ok()).collect();
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let mut spans = Vec::with_capacity(seq.len());
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for value in seq {
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if let Value::UserData(ud) = value {
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if let Ok(span) = ud.take::<Span>() {
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spans.push(span.0);
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} else if let Ok(line) = ud.take::<Line>() {
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spans.extend(line.0.spans.into_iter().collect::<Vec<_>>());
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} else {
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return Err("expected a table of Spans or Lines".into_lua_err());
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}
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}
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}
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Ok(Self(ratatui::text::Line::from(spans)))
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}
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}
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impl Line {
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pub fn install(lua: &Lua, ui: &Table) -> mlua::Result<()> {
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let new = lua.create_function(|_, (_, value): (Table, Value)| {
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if let Value::Table(tbl) = value {
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return Line::try_from(tbl);
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}
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Err("expected a table of Spans or Lines".into_lua_err())
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})?;
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let line = lua.create_table_from([
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// Alignment
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("LEFT", LEFT.into_lua(lua)?),
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("CENTER", CENTER.into_lua(lua)?),
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("RIGHT", RIGHT.into_lua(lua)?),
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])?;
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line.set_metatable(Some(lua.create_table_from([("__call", new)])?));
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ui.set("Line", line)
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}
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}
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impl UserData for Line {
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fn add_methods<'lua, M: UserDataMethods<'lua, Self>>(methods: &mut M) {
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methods.add_function("width", |_, ud: AnyUserData| Ok(ud.borrow_mut::<Self>()?.0.width()));
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methods.add_function("style", |_, (ud, value): (AnyUserData, Value)| {
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{
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let mut me = ud.borrow_mut::<Self>()?;
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match value {
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Value::Nil => me.0.reset_style(),
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Value::Table(tbl) => me.0.patch_style(Style::from(tbl).0),
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Value::UserData(ud) => me.0.patch_style(ud.borrow::<Style>()?.0),
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_ => return Err("expected a Style or Table or nil".into_lua_err()),
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}
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}
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Ok(ud)
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});
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methods.add_function("align", |_, (ud, align): (AnyUserData, u8)| {
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ud.borrow_mut::<Self>()?.0.alignment = Some(match align {
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CENTER => ratatui::layout::Alignment::Center,
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RIGHT => ratatui::layout::Alignment::Right,
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_ => ratatui::layout::Alignment::Left,
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});
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Ok(ud)
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});
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}
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}
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