use helix_core::{coords_at_pos, encoding, Position}; use helix_view::{ document::{Mode, SCRATCH_BUFFER_NAME}, graphics::Rect, theme::Style, Document, Editor, View, }; use crate::ui::ProgressSpinners; use helix_view::editor::StatusLineElement as StatusLineElementID; use tui::buffer::Buffer as Surface; use tui::text::{Span, Spans}; pub struct RenderContext<'a> { pub editor: &'a Editor, pub doc: &'a Document, pub view: &'a View, pub focused: bool, pub spinners: &'a ProgressSpinners, pub parts: RenderBuffer<'a>, } impl<'a> RenderContext<'a> { pub fn new( editor: &'a Editor, doc: &'a Document, view: &'a View, focused: bool, spinners: &'a ProgressSpinners, ) -> Self { RenderContext { editor, doc, view, focused, spinners, parts: RenderBuffer::default(), } } } #[derive(Default)] pub struct RenderBuffer<'a> { pub left: Spans<'a>, pub center: Spans<'a>, pub right: Spans<'a>, } pub fn render(context: &mut RenderContext, viewport: Rect, surface: &mut Surface) { let base_style = if context.focused { context.editor.theme.get("ui.statusline") } else { context.editor.theme.get("ui.statusline.inactive") }; surface.set_style(viewport.with_height(1), base_style); let write_left = |context: &mut RenderContext, text, style| { append(&mut context.parts.left, text, &base_style, style) }; let write_center = |context: &mut RenderContext, text, style| { append(&mut context.parts.center, text, &base_style, style) }; let write_right = |context: &mut RenderContext, text, style| { append(&mut context.parts.right, text, &base_style, style) }; // Left side of the status line. let element_ids = &context.editor.config().statusline.left; element_ids .iter() .map(|element_id| get_render_function(*element_id)) .for_each(|render| render(context, write_left)); surface.set_spans( viewport.x, viewport.y, &context.parts.left, context.parts.left.width() as u16, ); // Right side of the status line. let element_ids = &context.editor.config().statusline.right; element_ids .iter() .map(|element_id| get_render_function(*element_id)) .for_each(|render| render(context, write_right)); surface.set_spans( viewport.x + viewport .width .saturating_sub(context.parts.right.width() as u16), viewport.y, &context.parts.right, context.parts.right.width() as u16, ); // Center of the status line. let element_ids = &context.editor.config().statusline.center; element_ids .iter() .map(|element_id| get_render_function(*element_id)) .for_each(|render| render(context, write_center)); // Width of the empty space between the left and center area and between the center and right area. let spacing = 1u16; let edge_width = context.parts.left.width().max(context.parts.right.width()) as u16; let center_max_width = viewport.width.saturating_sub(2 * edge_width + 2 * spacing); let center_width = center_max_width.min(context.parts.center.width() as u16); surface.set_spans( viewport.x + viewport.width / 2 - center_width / 2, viewport.y, &context.parts.center, center_width, ); } fn append(buffer: &mut Spans, text: String, base_style: &Style, style: Option<Style>) { buffer.0.push(Span::styled( text, style.map_or(*base_style, |s| (*base_style).patch(s)), )); } fn get_render_function<F>(element_id: StatusLineElementID) -> impl Fn(&mut RenderContext, F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { match element_id { helix_view::editor::StatusLineElement::Mode => render_mode, helix_view::editor::StatusLineElement::Spinner => render_lsp_spinner, helix_view::editor::StatusLineElement::FileName => render_file_name, helix_view::editor::StatusLineElement::FileEncoding => render_file_encoding, helix_view::editor::StatusLineElement::FileLineEnding => render_file_line_ending, helix_view::editor::StatusLineElement::FileType => render_file_type, helix_view::editor::StatusLineElement::Diagnostics => render_diagnostics, helix_view::editor::StatusLineElement::Selections => render_selections, helix_view::editor::StatusLineElement::Position => render_position, helix_view::editor::StatusLineElement::PositionPercentage => render_position_percentage, helix_view::editor::StatusLineElement::Separator => render_separator, helix_view::editor::StatusLineElement::Spacer => render_spacer, } } fn render_mode<F>(context: &mut RenderContext, write: F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { let visible = context.focused; write( context, format!( " {} ", if visible { match context.editor.mode() { Mode::Insert => "INS", Mode::Select => "SEL", Mode::Normal => "NOR", } } else { // If not focused, explicitly leave an empty space instead of returning None. " " } ), if visible && context.editor.config().color_modes { match context.editor.mode() { Mode::Insert => Some(context.editor.theme.get("ui.statusline.insert")), Mode::Select => Some(context.editor.theme.get("ui.statusline.select")), Mode::Normal => Some(context.editor.theme.get("ui.statusline.normal")), } } else { None }, ); } fn render_lsp_spinner<F>(context: &mut RenderContext, write: F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { write( context, context .doc .language_server() .and_then(|srv| { context .spinners .get(srv.id()) .and_then(|spinner| spinner.frame()) }) // Even if there's no spinner; reserve its space to avoid elements frequently shifting. .unwrap_or(" ") .to_string(), None, ); } fn render_diagnostics<F>(context: &mut RenderContext, write: F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { let (warnings, errors) = context .doc .diagnostics() .iter() .fold((0, 0), |mut counts, diag| { use helix_core::diagnostic::Severity; match diag.severity { Some(Severity::Warning) => counts.0 += 1, Some(Severity::Error) | None => counts.1 += 1, _ => {} } counts }); if warnings > 0 { write( context, "●".to_string(), Some(context.editor.theme.get("warning")), ); write(context, format!(" {} ", warnings), None); } if errors > 0 { write( context, "●".to_string(), Some(context.editor.theme.get("error")), ); write(context, format!(" {} ", errors), None); } } fn render_selections<F>(context: &mut RenderContext, write: F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { let count = context.doc.selection(context.view.id).len(); write( context, format!(" {} sel{} ", count, if count == 1 { "" } else { "s" }), None, ); } fn get_position(context: &RenderContext) -> Position { coords_at_pos( context.doc.text().slice(..), context .doc .selection(context.view.id) .primary() .cursor(context.doc.text().slice(..)), ) } fn render_position<F>(context: &mut RenderContext, write: F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { let position = get_position(context); write( context, format!(" {}:{} ", position.row + 1, position.col + 1), None, ); } fn render_position_percentage<F>(context: &mut RenderContext, write: F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { let position = get_position(context); let maxrows = context.doc.text().len_lines(); write( context, format!("{}%", (position.row + 1) * 100 / maxrows), None, ); } fn render_file_encoding<F>(context: &mut RenderContext, write: F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { let enc = context.doc.encoding(); if enc != encoding::UTF_8 { write(context, format!(" {} ", enc.name()), None); } } fn render_file_line_ending<F>(context: &mut RenderContext, write: F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { use helix_core::LineEnding::*; let line_ending = match context.doc.line_ending { Crlf => "CRLF", LF => "LF", #[cfg(feature = "unicode-lines")] VT => "VT", // U+000B -- VerticalTab #[cfg(feature = "unicode-lines")] FF => "FF", // U+000C -- FormFeed #[cfg(feature = "unicode-lines")] CR => "CR", // U+000D -- CarriageReturn #[cfg(feature = "unicode-lines")] Nel => "NEL", // U+0085 -- NextLine #[cfg(feature = "unicode-lines")] LS => "LS", // U+2028 -- Line Separator #[cfg(feature = "unicode-lines")] PS => "PS", // U+2029 -- ParagraphSeparator }; write(context, format!(" {} ", line_ending), None); } fn render_file_type<F>(context: &mut RenderContext, write: F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { let file_type = context.doc.language_name().unwrap_or("text"); write(context, format!(" {} ", file_type), None); } fn render_file_name<F>(context: &mut RenderContext, write: F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { let title = { let rel_path = context.doc.relative_path(); let path = rel_path .as_ref() .map(|p| p.to_string_lossy()) .unwrap_or_else(|| SCRATCH_BUFFER_NAME.into()); format!( " {}{} ", path, if context.doc.is_modified() { "[+]" } else { "" } ) }; write(context, title, None); } fn render_separator<F>(context: &mut RenderContext, write: F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { let sep = &context.editor.config().statusline.separator; write( context, sep.to_string(), Some(context.editor.theme.get("ui.statusline.separator")), ); } fn render_spacer<F>(context: &mut RenderContext, write: F) where F: Fn(&mut RenderContext, String, Option<Style>) + Copy, { write(context, String::from(" "), None); }