wip: Move to new rendering structure.

1 files changed, 311 insertions, 0 deletions

diff --git a/helix-term/src/editor_view.rs b/helix-term/src/editor_view.rs
new file mode 100644
index 00000000..0181623a
--- /dev/null
+++ b/helix-term/src/editor_view.rs
@@ -0,0 +1,311 @@
+use crate::application::text_color;
+use crate::commands;
+use crate::compositor::{Component, Compositor, EventResult};
+use crate::keymap::{self, Keymaps};
+use crossterm::{
+    cursor,
+    event::{read, Event, EventStream, KeyCode, KeyEvent},
+};
+use helix_view::{document::Mode, Document, Editor, Theme, View};
+use std::borrow::Cow;
+use tui::{
+    backend::CrosstermBackend,
+    buffer::Buffer as Surface,
+    layout::Rect,
+    style::{Color, Modifier, Style},
+};
+
+use helix_core::{indent::TAB_WIDTH, syntax::HighlightEvent, Position, Range, State};
+
+pub struct EditorView {
+    keymap: Keymaps,
+}
+
+impl EditorView {
+    pub fn new() -> Self {
+        Self {
+            keymap: keymap::default(),
+        }
+    }
+    pub fn render_view(
+        &self,
+        view: &mut View,
+        viewport: Rect,
+        surface: &mut Surface,
+        theme: &Theme,
+    ) {
+        const OFFSET: u16 = 7; // 1 diagnostic + 5 linenr + 1 gutter
+        let area = Rect::new(OFFSET, 0, viewport.width - OFFSET, viewport.height - 2); // - 2 for statusline and prompt
+        self.render_buffer(view, area, surface, theme);
+        let area = Rect::new(0, viewport.height - 2, viewport.width, 1);
+        self.render_statusline(view, viewport, surface, theme);
+    }
+
+    // TODO: ideally not &mut View but highlights require it because of cursor cache
+    pub fn render_buffer(
+        &self,
+        view: &mut View,
+        viewport: Rect,
+        surface: &mut Surface,
+        theme: &Theme,
+    ) {
+        //  clear with background color
+        surface.set_style(viewport, theme.get("ui.background"));
+
+        // TODO: inefficient, should feed chunks.iter() to tree_sitter.parse_with(|offset, pos|)
+        let source_code = view.doc.text().to_string();
+
+        let last_line = view.last_line();
+
+        let range = {
+            // calculate viewport byte ranges
+            let start = view.doc.text().line_to_byte(view.first_line);
+            let end = view.doc.text().line_to_byte(last_line)
+                + view.doc.text().line(last_line).len_bytes();
+
+            start..end
+        };
+
+        // TODO: range doesn't actually restrict source, just highlight range
+        // TODO: cache highlight results
+        // TODO: only recalculate when state.doc is actually modified
+        let highlights: Vec<_> = match view.doc.syntax.as_mut() {
+            Some(syntax) => {
+                syntax
+                    .highlight_iter(source_code.as_bytes(), Some(range), None, |_| None)
+                    .unwrap()
+                    .collect() // TODO: we collect here to avoid double borrow, fix later
+            }
+            None => vec![Ok(HighlightEvent::Source {
+                start: range.start,
+                end: range.end,
+            })],
+        };
+        let mut spans = Vec::new();
+        let mut visual_x = 0;
+        let mut line = 0u16;
+        let visible_selections: Vec<Range> = view
+            .doc
+            .state
+            .selection()
+            .ranges()
+            .iter()
+            // TODO: limit selection to one in viewport
+            // .filter(|range| !range.is_empty()) // && range.overlaps(&Range::new(start, end + 1))
+            .copied()
+            .collect();
+
+        'outer: for event in highlights {
+            match event.unwrap() {
+                HighlightEvent::HighlightStart(span) => {
+                    spans.push(span);
+                }
+                HighlightEvent::HighlightEnd => {
+                    spans.pop();
+                }
+                HighlightEvent::Source { start, end } => {
+                    // TODO: filter out spans out of viewport for now..
+
+                    let start = view.doc.text().byte_to_char(start);
+                    let end = view.doc.text().byte_to_char(end); // <-- index 744, len 743
+
+                    let text = view.doc.text().slice(start..end);
+
+                    use helix_core::graphemes::{grapheme_width, RopeGraphemes};
+
+                    let style = match spans.first() {
+                        Some(span) => theme.get(theme.scopes()[span.0].as_str()),
+                        None => Style::default().fg(Color::Rgb(164, 160, 232)), // lavender
+                    };
+
+                    // TODO: we could render the text to a surface, then cache that, that
+                    // way if only the selection/cursor changes we can copy from cache
+                    // and paint the new cursor.
+
+                    let mut char_index = start;
+
+                    // iterate over range char by char
+                    for grapheme in RopeGraphemes::new(&text) {
+                        // TODO: track current char_index
+
+                        if grapheme == "\n" {
+                            visual_x = 0;
+                            line += 1;
+
+                            // TODO: with proper iter this shouldn't be necessary
+                            if line >= viewport.height {
+                                break 'outer;
+                            }
+                        } else if grapheme == "\t" {
+                            visual_x += (TAB_WIDTH as u16);
+                        } else {
+                            // Cow will prevent allocations if span contained in a single slice
+                            // which should really be the majority case
+                            let grapheme = Cow::from(grapheme);
+                            let width = grapheme_width(&grapheme) as u16;
+
+                            // TODO: this should really happen as an after pass
+                            let style = if visible_selections
+                                .iter()
+                                .any(|range| range.contains(char_index))
+                            {
+                                // cedar
+                                style.clone().bg(Color::Rgb(128, 47, 0))
+                            } else {
+                                style
+                            };
+
+                            let style = if visible_selections
+                                .iter()
+                                .any(|range| range.head == char_index)
+                            {
+                                style.clone().bg(Color::Rgb(255, 255, 255))
+                            } else {
+                                style
+                            };
+
+                            // ugh, improve with a traverse method
+                            // or interleave highlight spans with selection and diagnostic spans
+                            let style = if view.doc.diagnostics.iter().any(|diagnostic| {
+                                diagnostic.range.0 <= char_index && diagnostic.range.1 > char_index
+                            }) {
+                                style.clone().add_modifier(Modifier::UNDERLINED)
+                            } else {
+                                style
+                            };
+
+                            // TODO: paint cursor heads except primary
+
+                            surface.set_string(
+                                viewport.x + visual_x,
+                                viewport.y + line,
+                                grapheme,
+                                style,
+                            );
+
+                            visual_x += width;
+                        }
+
+                        char_index += 1;
+                    }
+                }
+            }
+        }
+
+        let style: Style = theme.get("ui.linenr");
+        let warning: Style = theme.get("warning");
+        let last_line = view.last_line();
+        for (i, line) in (view.first_line..last_line).enumerate() {
+            if view.doc.diagnostics.iter().any(|d| d.line == line) {
+                surface.set_stringn(0, i as u16, "●", 1, warning);
+            }
+
+            surface.set_stringn(1, i as u16, format!("{:>5}", line + 1), 5, style);
+        }
+    }
+
+    pub fn render_statusline(
+        &self,
+        view: &View,
+        viewport: Rect,
+        surface: &mut Surface,
+        theme: &Theme,
+    ) {
+        let mode = match view.doc.mode() {
+            Mode::Insert => "INS",
+            Mode::Normal => "NOR",
+            Mode::Goto => "GOTO",
+        };
+        // statusline
+        surface.set_style(
+            Rect::new(0, viewport.y, viewport.height, 1),
+            theme.get("ui.statusline"),
+        );
+        surface.set_string(1, viewport.y, mode, text_color());
+
+        if let Some(path) = view.doc.path() {
+            surface.set_string(6, viewport.y, path.to_string_lossy(), text_color());
+        }
+
+        surface.set_string(
+            viewport.width - 10,
+            viewport.y,
+            format!("{}", view.doc.diagnostics.len()),
+            text_color(),
+        );
+    }
+}
+
+use crate::compositor::Context;
+
+impl Component for EditorView {
+    fn handle_event(&mut self, event: Event, cx: &mut Context) -> EventResult {
+        match event {
+            Event::Resize(width, height) => {
+                // TODO: simplistic ensure cursor in view for now
+                // TODO: loop over views
+                if let Some(view) = cx.editor.view_mut() {
+                    view.size = (width, height);
+                    view.ensure_cursor_in_view()
+                };
+                EventResult::Consumed(None)
+            }
+            Event::Key(event) => {
+                if let Some(view) = cx.editor.view_mut() {
+                    let keys = vec![event];
+                    // TODO: sequences (`gg`)
+                    let mode = view.doc.mode();
+                    // TODO: handle count other than 1
+                    let mut cx = commands::Context {
+                        view,
+                        executor: cx.executor,
+                        count: 1,
+                        callback: None,
+                    };
+
+                    match mode {
+                        Mode::Insert => {
+                            if let Some(command) = self.keymap[&Mode::Insert].get(&keys) {
+                                command(&mut cx);
+                            } else if let KeyEvent {
+                                code: KeyCode::Char(c),
+                                ..
+                            } = event
+                            {
+                                commands::insert::insert_char(&mut cx, c);
+                            }
+                        }
+                        mode => {
+                            if let Some(command) = self.keymap[&mode].get(&keys) {
+                                command(&mut cx);
+
+                                // TODO: simplistic ensure cursor in view for now
+                            }
+                        }
+                    }
+                    // appease borrowck
+                    let callback = cx.callback.take();
+
+                    view.ensure_cursor_in_view();
+
+                    EventResult::Consumed(callback)
+                } else {
+                    EventResult::Ignored
+                }
+            }
+            Event::Mouse(_) => EventResult::Ignored,
+        }
+    }
+
+    fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) {
+        // SAFETY: we cheat around the view_mut() borrow because it doesn't allow us to also borrow
+        // theme. Theme is immutable mutating view won't disrupt theme_ref.
+        let theme_ref = unsafe { &*(&cx.editor.theme as *const Theme) };
+        if let Some(view) = cx.editor.view_mut() {
+            self.render_view(view, area, surface, theme_ref);
+        }
+
+        // TODO: drop unwrap
+        // TODO: !!! self.render_cursor(cx.editor.view().unwrap(), None, viewport);
+    }
+}