461 lines
15 KiB
Rust
461 lines
15 KiB
Rust
use helix_core::{coords_at_pos, encoding, Position};
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use helix_lsp::lsp::DiagnosticSeverity;
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use helix_view::document::DEFAULT_LANGUAGE_NAME;
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use helix_view::{
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document::{Mode, SCRATCH_BUFFER_NAME},
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graphics::Rect,
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Document, Editor, View,
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};
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use crate::ui::ProgressSpinners;
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use helix_view::editor::StatusLineElement as StatusLineElementID;
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use tui::buffer::Buffer as Surface;
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use tui::text::{Span, Spans};
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pub struct RenderContext<'a> {
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pub editor: &'a Editor,
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pub doc: &'a Document,
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pub view: &'a View,
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pub focused: bool,
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pub spinners: &'a ProgressSpinners,
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}
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impl<'a> RenderContext<'a> {
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pub fn new(
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editor: &'a Editor,
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doc: &'a Document,
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view: &'a View,
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focused: bool,
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spinners: &'a ProgressSpinners,
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) -> Self {
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RenderContext {
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editor,
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doc,
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view,
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focused,
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spinners,
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}
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}
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}
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pub fn render(context: &mut RenderContext, viewport: Rect, surface: &mut Surface) {
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let base_style = if context.focused {
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context.editor.theme.get("ui.statusline")
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} else {
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context.editor.theme.get("ui.statusline.inactive")
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};
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surface.set_style(viewport.with_height(1), base_style);
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let statusline = render_statusline(context, viewport.width as usize);
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surface.set_spans(
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viewport.x,
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viewport.y,
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&statusline,
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statusline.width() as u16,
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);
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}
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pub fn render_statusline<'a>(context: &mut RenderContext, width: usize) -> Spans<'a> {
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let config = context.editor.config();
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let element_ids = &config.statusline.left;
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let mut left = element_ids
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.iter()
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.map(|element_id| get_render_function(*element_id))
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.flat_map(|render| render(context).0)
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.collect::<Vec<Span>>();
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let element_ids = &config.statusline.center;
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let mut center = element_ids
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.iter()
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.map(|element_id| get_render_function(*element_id))
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.flat_map(|render| render(context).0)
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.collect::<Vec<Span>>();
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let element_ids = &config.statusline.right;
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let mut right = element_ids
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.iter()
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.map(|element_id| get_render_function(*element_id))
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.flat_map(|render| render(context).0)
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.collect::<Vec<Span>>();
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let left_area_width: usize = left.iter().map(|s| s.width()).sum();
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let center_area_width: usize = center.iter().map(|s| s.width()).sum();
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let right_area_width: usize = right.iter().map(|s| s.width()).sum();
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let min_spacing_between_areas = 1usize;
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let sides_space_required = left_area_width + right_area_width + min_spacing_between_areas;
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let total_space_required = sides_space_required + center_area_width + min_spacing_between_areas;
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let mut statusline: Vec<Span> = vec![];
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if center_area_width > 0 && total_space_required <= width {
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// SAFETY: this subtraction cannot underflow because `left_area_width + center_area_width + right_area_width`
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// is smaller than `total_space_required`, which is smaller than `width` in this branch.
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let total_spacers = width - (left_area_width + center_area_width + right_area_width);
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// This is how much padding space it would take on either side to align the center area to the middle.
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let center_margin = (width - center_area_width) / 2;
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let left_spacers = if left_area_width < center_margin && right_area_width < center_margin {
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// Align the center area to the middle if there is enough space on both sides.
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center_margin - left_area_width
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} else {
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// Otherwise split the available space evenly and use it as margin.
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// The center element won't be aligned to the middle but it will be evenly
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// spaced between the left and right areas.
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total_spacers / 2
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};
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let right_spacers = total_spacers - left_spacers;
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statusline.append(&mut left);
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statusline.push(" ".repeat(left_spacers).into());
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statusline.append(&mut center);
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statusline.push(" ".repeat(right_spacers).into());
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statusline.append(&mut right);
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} else if right_area_width > 0 && sides_space_required <= width {
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let side_areas_width = left_area_width + right_area_width;
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statusline.append(&mut left);
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statusline.push(" ".repeat(width - side_areas_width).into());
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statusline.append(&mut right);
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} else if left_area_width <= width {
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statusline.append(&mut left);
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}
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statusline.into()
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}
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fn get_render_function<'a>(
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element_id: StatusLineElementID,
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) -> impl Fn(&RenderContext) -> Spans<'a> {
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match element_id {
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helix_view::editor::StatusLineElement::Mode => render_mode,
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helix_view::editor::StatusLineElement::Spinner => render_lsp_spinner,
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helix_view::editor::StatusLineElement::FileBaseName => render_file_base_name,
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helix_view::editor::StatusLineElement::FileName => render_file_name,
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helix_view::editor::StatusLineElement::FileAbsolutePath => render_file_absolute_path,
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helix_view::editor::StatusLineElement::FileModificationIndicator => {
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render_file_modification_indicator
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}
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helix_view::editor::StatusLineElement::ReadOnlyIndicator => render_read_only_indicator,
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helix_view::editor::StatusLineElement::FileEncoding => render_file_encoding,
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helix_view::editor::StatusLineElement::FileLineEnding => render_file_line_ending,
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helix_view::editor::StatusLineElement::FileType => render_file_type,
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helix_view::editor::StatusLineElement::Diagnostics => render_diagnostics,
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helix_view::editor::StatusLineElement::WorkspaceDiagnostics => render_workspace_diagnostics,
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helix_view::editor::StatusLineElement::Selections => render_selections,
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helix_view::editor::StatusLineElement::PrimarySelectionLength => {
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render_primary_selection_length
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}
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helix_view::editor::StatusLineElement::Position => render_position,
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helix_view::editor::StatusLineElement::PositionPercentage => render_position_percentage,
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helix_view::editor::StatusLineElement::TotalLineNumbers => render_total_line_numbers,
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helix_view::editor::StatusLineElement::Separator => render_separator,
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helix_view::editor::StatusLineElement::Spacer => render_spacer,
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helix_view::editor::StatusLineElement::VersionControl => render_version_control,
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helix_view::editor::StatusLineElement::Register => render_register,
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}
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}
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fn render_mode<'a>(context: &RenderContext) -> Spans<'a> {
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let visible = context.focused;
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let config = context.editor.config();
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let modenames = &config.statusline.mode;
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let modename = if visible {
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match context.editor.mode() {
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Mode::Insert => modenames.insert.clone(),
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Mode::Select => modenames.select.clone(),
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Mode::Normal => modenames.normal.clone(),
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}
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} else {
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// If not focused, explicitly leave an empty space.
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" ".into()
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};
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let modename = format!(" {} ", modename);
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if visible && config.color_modes {
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Span::styled(
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modename,
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match context.editor.mode() {
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Mode::Insert => context.editor.theme.get("ui.statusline.insert"),
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Mode::Select => context.editor.theme.get("ui.statusline.select"),
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Mode::Normal => context.editor.theme.get("ui.statusline.normal"),
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},
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)
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.into()
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} else {
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Span::raw(modename).into()
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}
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}
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// TODO think about handling multiple language servers
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fn render_lsp_spinner<'a>(context: &RenderContext) -> Spans<'a> {
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let language_server = context.doc.language_servers().next();
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Span::raw(
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language_server
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.and_then(|srv| {
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context
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.spinners
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.get(srv.id())
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.and_then(|spinner| spinner.frame())
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})
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// Even if there's no spinner; reserve its space to avoid elements frequently shifting.
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.unwrap_or(" ")
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.to_string(),
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)
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.into()
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}
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fn render_diagnostics<'a>(context: &RenderContext) -> Spans<'a> {
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let (warnings, errors) = context
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.doc
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.diagnostics()
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.iter()
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.fold((0, 0), |mut counts, diag| {
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use helix_core::diagnostic::Severity;
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match diag.severity {
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Some(Severity::Warning) => counts.0 += 1,
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Some(Severity::Error) | None => counts.1 += 1,
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_ => {}
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}
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counts
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});
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let mut output = Spans::default();
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if warnings > 0 {
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output.0.push(Span::styled(
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"●".to_string(),
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context.editor.theme.get("warning"),
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));
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output.0.push(Span::raw(format!(" {} ", warnings)));
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}
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if errors > 0 {
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output.0.push(Span::styled(
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"●".to_string(),
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context.editor.theme.get("error"),
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));
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output.0.push(Span::raw(format!(" {} ", errors)));
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}
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output
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}
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fn render_workspace_diagnostics<'a>(context: &RenderContext) -> Spans<'a> {
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let (warnings, errors) =
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context
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.editor
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.diagnostics
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.values()
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.flatten()
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.fold((0, 0), |mut counts, (diag, _)| {
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match diag.severity {
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Some(DiagnosticSeverity::WARNING) => counts.0 += 1,
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Some(DiagnosticSeverity::ERROR) | None => counts.1 += 1,
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_ => {}
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}
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counts
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});
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let mut output = Spans::default();
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if warnings > 0 || errors > 0 {
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output.0.push(Span::raw(" W "));
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}
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if warnings > 0 {
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output.0.push(Span::styled(
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"●".to_string(),
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context.editor.theme.get("warning"),
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));
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output.0.push(Span::raw(format!(" {} ", warnings)));
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}
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if errors > 0 {
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output.0.push(Span::styled(
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"●".to_string(),
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context.editor.theme.get("error"),
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));
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output.0.push(Span::raw(format!(" {} ", errors)));
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}
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output
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}
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fn render_selections<'a>(context: &RenderContext) -> Spans<'a> {
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let count = context.doc.selection(context.view.id).len();
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Span::raw(format!(
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" {} sel{} ",
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count,
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if count == 1 { "" } else { "s" }
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))
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.into()
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}
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fn render_primary_selection_length<'a>(context: &RenderContext) -> Spans<'a> {
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let tot_sel = context.doc.selection(context.view.id).primary().len();
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Span::raw(format!(
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" {} char{} ",
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tot_sel,
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if tot_sel == 1 { "" } else { "s" }
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))
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.into()
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}
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fn get_position(context: &RenderContext) -> Position {
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coords_at_pos(
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context.doc.text().slice(..),
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context
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.doc
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.selection(context.view.id)
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.primary()
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.cursor(context.doc.text().slice(..)),
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)
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}
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fn render_position<'a>(context: &RenderContext) -> Spans<'a> {
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let position = get_position(context);
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Span::raw(format!(" {}:{} ", position.row + 1, position.col + 1)).into()
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}
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fn render_total_line_numbers<'a>(context: &RenderContext) -> Spans<'a> {
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let total_line_numbers = context.doc.text().len_lines();
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Span::raw(format!(" {} ", total_line_numbers)).into()
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}
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fn render_position_percentage<'a>(context: &RenderContext) -> Spans<'a> {
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let position = get_position(context);
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let maxrows = context.doc.text().len_lines();
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Span::raw(format!("{}%", (position.row + 1) * 100 / maxrows)).into()
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}
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fn render_file_encoding<'a>(context: &RenderContext) -> Spans<'a> {
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let enc = context.doc.encoding();
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if enc != encoding::UTF_8 {
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Span::raw(format!(" {} ", enc.name())).into()
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} else {
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Spans::default()
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}
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}
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fn render_file_line_ending<'a>(context: &RenderContext) -> Spans<'a> {
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use helix_core::LineEnding::*;
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let line_ending = match context.doc.line_ending {
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Crlf => "CRLF",
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LF => "LF",
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#[cfg(feature = "unicode-lines")]
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VT => "VT", // U+000B -- VerticalTab
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#[cfg(feature = "unicode-lines")]
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FF => "FF", // U+000C -- FormFeed
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#[cfg(feature = "unicode-lines")]
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CR => "CR", // U+000D -- CarriageReturn
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#[cfg(feature = "unicode-lines")]
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Nel => "NEL", // U+0085 -- NextLine
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#[cfg(feature = "unicode-lines")]
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LS => "LS", // U+2028 -- Line Separator
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#[cfg(feature = "unicode-lines")]
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PS => "PS", // U+2029 -- ParagraphSeparator
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};
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Span::raw(format!(" {} ", line_ending)).into()
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}
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fn render_file_type<'a>(context: &RenderContext) -> Spans<'a> {
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let file_type = context.doc.language_name().unwrap_or(DEFAULT_LANGUAGE_NAME);
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Span::raw(format!(" {} ", file_type)).into()
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}
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fn render_file_name<'a>(context: &RenderContext) -> Spans<'a> {
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let title = {
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let rel_path = context.doc.relative_path();
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let path = rel_path
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.as_ref()
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.map(|p| p.to_string_lossy())
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.unwrap_or_else(|| SCRATCH_BUFFER_NAME.into());
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format!(" {} ", path)
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};
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Span::raw(title).into()
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}
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fn render_file_absolute_path<'a>(context: &RenderContext) -> Spans<'a> {
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let title = {
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let path = context.doc.path();
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let path = path
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.as_ref()
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.map(|p| p.to_string_lossy())
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.unwrap_or_else(|| SCRATCH_BUFFER_NAME.into());
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format!(" {} ", path)
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};
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Span::raw(title).into()
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}
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fn render_file_modification_indicator<'a>(context: &RenderContext) -> Spans<'a> {
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let title = (if context.doc.is_modified() {
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"[+]"
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} else {
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" "
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})
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.to_string();
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Span::raw(title).into()
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}
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fn render_read_only_indicator<'a>(context: &RenderContext) -> Spans<'a> {
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let title = if context.doc.readonly {
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" [readonly] "
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} else {
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""
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}
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.to_string();
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Span::raw(title).into()
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}
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fn render_file_base_name<'a>(context: &RenderContext) -> Spans<'a> {
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let title = {
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let rel_path = context.doc.relative_path();
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let path = rel_path
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.as_ref()
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.and_then(|p| p.file_name().map(|s| s.to_string_lossy()))
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.unwrap_or_else(|| SCRATCH_BUFFER_NAME.into());
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format!(" {} ", path)
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};
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Span::raw(title).into()
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}
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fn render_separator<'a>(context: &RenderContext) -> Spans<'a> {
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let sep = &context.editor.config().statusline.separator;
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Span::styled(
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sep.to_string(),
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context.editor.theme.get("ui.statusline.separator"),
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)
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.into()
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}
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fn render_spacer<'a>(_context: &RenderContext) -> Spans<'a> {
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Span::raw(" ").into()
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}
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fn render_version_control<'a>(context: &RenderContext) -> Spans<'a> {
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let head = context
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.doc
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.version_control_head()
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.unwrap_or_default()
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.to_string();
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Span::raw(head).into()
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}
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fn render_register<'a>(context: &RenderContext) -> Spans<'a> {
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if let Some(reg) = context.editor.selected_register {
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Span::raw(format!(" reg={} ", reg)).into()
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} else {
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Spans::default()
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}
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}
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