background / foreground highlight

src/nvim.rs

@@ -1,6 +1,7 @@
 use neovim_lib::{Neovim, NeovimApi, Session};
 use std::io::{Result, Error, ErrorKind};
 use std::result;
+use std::collections::HashMap;
 use ui_model::UiModel;
 use rmp::Value;
 use rmp::value::Integer;
@@ -18,6 +19,8 @@ pub trait RedrawEvents {
     fn on_resize(&mut self, columns: u64, rows: u64);
 
     fn on_redraw(&self);
+
+    fn on_highlight_set(&mut self, attrs: &HashMap<String, Value>);
 }
 
 macro_rules! try_str {
@@ -110,7 +113,23 @@ fn call(method: &str, args: Vec<Value>) {
                 Ok(())
             });
         }
-        _ => println!("Event {}", method),
+        "highlight_set" => {
+            safe_call(move |ui| {
+                if let Value::Map(ref attrs) = args[0] {
+                    let attrs_map: HashMap<String, Value> = attrs.iter().map(|v| {
+                        match v {
+                            &(Value::String(ref key), ref value) => (key.clone(), value.clone()),
+                            _ => panic!("attribute key must be string"),
+                        }
+                    }).collect();
+                    ui.on_highlight_set(&attrs_map);
+                } else {
+                    panic!("Supports only map value as argument");
+                }
+                Ok(())
+            });
+        }
+        _ => println!("Event {}({:?})", method, args),
     };
 }
 

src/ui.rs

@@ -1,5 +1,10 @@
 use std::cell::RefCell;
 use std::thread;
+use std::collections::HashMap;
+use std::mem;
+
+use rmp::Value;
+use rmp::value::Integer;
 
 use cairo;
 use gtk;
@@ -9,7 +14,7 @@ use gdk;
 use gdk::EventKey;
 use neovim_lib::{Neovim, NeovimApi};
 
-use ui_model::UiModel;
+use ui_model::{UiModel, Attrs, Color};
 use nvim::RedrawEvents;
 
 thread_local!(pub static UI: RefCell<Ui> = {
@@ -25,6 +30,7 @@ pub struct Ui {
     pub model: UiModel,
     nvim: Option<Neovim>,
     drawing_area: DrawingArea,
+    cur_attrs: Option<Attrs>,
 }
 
 impl Ui {
@@ -33,6 +39,7 @@ impl Ui {
             model: UiModel::empty(),
             drawing_area: DrawingArea::new(),
             nvim: None,
+            cur_attrs: None,
         }
     }
 
@@ -104,6 +111,10 @@ fn gtk_draw(drawing_area: &DrawingArea, ctx: &cairo::Context) -> Inhibit {
     let width = drawing_area.get_allocated_width() as f64;
     let height = drawing_area.get_allocated_height() as f64;
 
+    ctx.set_source_rgb(0.0, 0.0, 0.0);
+    ctx.paint();
+    ctx.set_source_rgb(1.0, 1.0, 1.0);
+
     let font_face = cairo::FontFace::toy_create("",
                                                 cairo::enums::FontSlant::Normal,
                                                 cairo::enums::FontWeight::Normal);
@@ -113,11 +124,23 @@ fn gtk_draw(drawing_area: &DrawingArea, ctx: &cairo::Context) -> Inhibit {
     UI.with(|ui_cell| {
         let ui = ui_cell.borrow();
 
-        ctx.set_source_rgb(0.0, 0.0, 0.0);
         let mut line_y = font_extents.height;
-        for line in ui.model.lines() {
+        for line in ui.model.model() {
-            ctx.move_to(0.0, line_y);
+            ctx.move_to(0.0, line_y - font_extents.descent);
-            ctx.show_text(&line);
+            for cell in line {
+                let bg = &cell.attrs.background;
+                ctx.set_source_rgb(bg.0, bg.1, bg.2);
+                //ctx.set_source_rgb(1.0, 0.0 , 0.0);
+                let text_extents = ctx.text_extents(&cell.ch.to_string());
+                let current_point = ctx.get_current_point();
+                ctx.rectangle(current_point.0, line_y - font_extents.height, text_extents.width, font_extents.height);
+                ctx.fill();
+
+                 ctx.move_to(current_point.0, current_point.1);
+                let fg = &cell.attrs.foreground;
+                ctx.set_source_rgb(fg.0, fg.1, fg.2);
+                ctx.show_text(&cell.ch.to_string());
+            }
             line_y += font_extents.height;
         }
     });
@@ -131,7 +154,7 @@ impl RedrawEvents for Ui {
     }
 
     fn on_put(&mut self, text: &str) {
-        self.model.put(text);
+        self.model.put(text, &self.cur_attrs);
     }
 
     fn on_clear(&mut self) {
@@ -145,4 +168,26 @@ impl RedrawEvents for Ui {
     fn on_redraw(&self) {
         self.drawing_area.queue_draw();
     }
+
+    // highlight_set([Map([(String("bold"), Boolean(true)), (String("foreground"), Integer(U64(255)))])])
+    fn on_highlight_set(&mut self, attrs: &HashMap<String, Value>) {
+        let mut model_attrs = Attrs::new();
+        if let Some(&Value::Integer(Integer::U64(fg))) = attrs.get("foreground") {
+            model_attrs.foreground = split_color(fg);
+        }
+        if let Some(&Value::Integer(Integer::U64(fg))) = attrs.get("background") {
+            model_attrs.background = split_color(fg);
+        }
+        if attrs.contains_key("reverse") {
+            mem::swap(&mut model_attrs.foreground, &mut model_attrs.background);
+        }
+        self.cur_attrs = Some(model_attrs);
+    }
+}
+
+fn split_color(indexed_color: u64) -> Color {
+    let r = ((indexed_color >> 16) & 0xff) as f64;
+    let g = ((indexed_color >> 8) & 0xff) as f64;
+    let b = (indexed_color & 0xff) as f64;
+    Color(255.0 / r, 255.0 / g, 255.0 / b)
 }

src/ui_model.rs

@@ -1,10 +1,36 @@
+
+#[derive(Clone)]
+pub struct Color(pub f64, pub f64, pub f64);
+
+const COLOR_BLACK: Color = Color(0.0, 0.0, 0.0);
+const COLOR_WHITE: Color = Color(1.0, 1.0, 1.0);
+
+#[derive(Clone)]
+pub struct Attrs {
+    pub foreground: Color,
+    pub background: Color,
+}
+
+impl Attrs {
+    pub fn new() -> Attrs {
+        Attrs {
+            foreground: COLOR_WHITE,
+            background: COLOR_BLACK,
+        }
+    }
+}
+
 pub struct Cell {
-    ch: char,
+    pub ch: char,
+    pub attrs: Attrs,
 }
 
 impl Cell {
     pub fn new(ch: char) -> Cell {
-        Cell { ch: ch }
+        Cell {
+            ch: ch,
+            attrs: Attrs::new(),
+        }
     }
 
     fn clear(&mut self) {
@@ -43,8 +69,8 @@ impl UiModel {
         }
     }
 
-    pub fn lines(&self) -> Vec<String> {
+    pub fn model(&self) -> &Vec<Vec<Cell>> {
-        self.model.iter().map(|r| r.iter().map(|c| c.ch).collect::<String>()).collect()
+        &self.model
     }
 
     pub fn set_cursor(&mut self, row: u64, col: u64) {
@@ -52,8 +78,10 @@ impl UiModel {
         self.cur_row = row as usize;
     }
 
-    pub fn put(&mut self, text: &str) {
+    pub fn put(&mut self, text: &str, attrs: &Option<Attrs>) {
-        self.model[self.cur_row][self.cur_col].ch = text.chars().last().unwrap();
+        let mut cell = &mut self.model[self.cur_row][self.cur_col];
+        cell.ch = text.chars().last().unwrap();
+        cell.attrs = attrs.as_ref().map(|o| o.clone()).unwrap_or_else(|| Attrs::new());
         self.cur_col += 1;
     }