Handle mode-dependent cursor shape

Author: sakhnik

README.md

@@ -11,18 +11,20 @@ Turns out, it's quite easy to code after experiments with [SpyUI](https://github
 - [x] Improve redrawing by combining adjacent cells with the same hl_id
 - [x] Test MinGW build
 - [x] Setup GitHub actions to build for Win32
+- [x] Cursor shapes
 - [ ] Automatic testing
-- [ ] Cursor shapes
 - [ ] Properly close the editor when the window is about to be closed
 - [ ] Make redrawing atomic with flush
 - [ ] Handle special keys like arrows, functional keys
 - [ ] Handle the rest of highlight attributes
 - [ ] Handle errors and failures
 - [ ] Use pango for text layout
 - [ ] Allow selecting GUI font
+- [ ] Fast zoom with mouse wheel
 - [ ] Consider externalizing popup menus to add scrollbars
 - [ ] Configuration of fonts and behaviour tweaking (consider using lua)
 - [ ] Mouse support
 - [ ] Change mouse pointer on busy_start/busy_stop notifications
 - [ ] Create window after neovim has been launched and initialized to avoid white flash during startup
 - [ ] Setup automatic releases (win32, appimage)
+- [ ] Track mode_info

grid.vala

@@ -122,10 +122,17 @@ class Grid {
         if (cursor.row >= top && cursor.row < bot &&
             cursor.col >= left && cursor.col < right) {
             ctx.save ();
-            ctx.set_line_width (w * 0.1);
             ctx.set_tolerance (0.1);
+            ctx.set_line_width (w * 0.1);
             ctx.set_source_rgba (1.0, 1.0, 1.0, 0.5);
-            ctx.rectangle (cursor.col * w, cursor.row * h, w, h);
+            ctx.translate (cursor.col * w, cursor.row * h);
+            if (renderer.mode == "insert") {
+                ctx.rectangle (0, 0, 0.2 * w, h);
+            } else if (renderer.mode == "replace" || renderer.mode == "operator") {
+                ctx.rectangle (0, 0.75 * h, w, 0.25 * h);
+            } else {
+                ctx.rectangle (0, 0, w, h);
+            }
             ctx.fill ();
             ctx.restore ();
         }

hacks.c

@@ -0,0 +1,6 @@
+#include <msgpack/object.h>
+
+void my_print (msgpack_object o, FILE* out)
+{
+  return msgpack_object_print(out, o);
+}

meson.build

@@ -16,6 +16,7 @@ dependencies = [
 ]
 
 sources = files(
+    'hacks.c',
     'main.vala',
     'msgpack-rpc.vala',
     'renderer.vala',

renderer.vala

@@ -1,4 +1,7 @@
 
+// MessagePack.Object.print () is broken, and I can't fix the order of arguments
+//extern void my_print (MessagePack.Object o, GLib.FileStream out);
+
 class Renderer : GLib.Object {
 
     private unowned MsgpackRpc _rpc;
@@ -105,6 +108,10 @@ class Renderer : GLib.Object {
                 handler = grid_scroll;
             } else if (memEqual (subtype, "win_viewport".data)) {
                 // just info to display, can skip
+            } else if (memEqual (subtype, "mode_info_set".data)) {
+                //my_print (event[1], GLib.stdout);
+            } else if (memEqual (subtype, "mode_change".data)) {
+                handler = mode_change;
             } else {
                 print ("Ignoring redraw %.*s\n", subtype.length, subtype);
                 continue;
@@ -351,4 +358,12 @@ class Renderer : GLib.Object {
                 }
             });
     }
+
+    public string mode { get; private set; }
+
+    private void mode_change (MessagePack.Object[] event) {
+        unowned var m = event[0].str.str;
+        mode = "%.*s".printf (m.length, m);
+        changed (_cursor.row, _cursor.row + 1, _cursor.col, _cursor.col + 1);
+    }
 }