add copy, start on paste and text selections

src/dlib

@@ -1 +1 @@
-Subproject commit 2af4a293148aadac84d9fec3505d2adcdb747298
+Subproject commit 92c4f8eb665e9fc7a58dc9631bb6f26a0828a638

src/editor/buffer.d

@@ -15,12 +15,26 @@ struct FlatBuffer
 	LineStart[] line_starts;
 	u64         length;
 	u64         lf_count;
+
 	i64         buf_pos;
 	i64         offset;
 	i64         rows;
+
+	I64Vec2     sel;
+	SelectMode  sel_mode;
+
 	bool        dirty;
 }
 
+enum SelectMode
+{
+	None,
+	Normal,
+	Line,
+}
+
+alias SM = SelectMode;
+
 struct LineStart
 {
 	u64 pos;
@@ -98,6 +112,7 @@ CreateFlatBuffer(u8[] data)
 		data: buf,
 		length: cast(u64)data.length,
 		lf_count: CountLF(data),
+		sel: -1,
 	};
 
 	fb.tk = CreateTokenizer(&fb);
@@ -277,7 +292,42 @@ Insert(FlatBuffer* fb, u8[] insert, u64 length, u64 pos)
 
 	Reset(&fb.arena);
 
-	AdjustOffset(fb);
+	UpdateOffset(fb);
+}
+
+void
+ToggleSelection(FlatBuffer* fb, SelectMode mode)
+{
+	if(fb.sel_mode == SM.None)
+	{
+		StartSelection(fb, mode);
+	}
+	else
+	{
+		EndSelection(fb);
+	}
+}
+
+void
+StartSelection(FlatBuffer* fb, SelectMode mode)
+{
+	fb.sel_mode = mode;
+
+	if(mode == SM.Normal)
+	{
+		fb.sel = fb.buf_pos;
+	}
+	else if(mode == SM.Line)
+	{
+		fb.sel = CurrentLine(fb);
+	}
+}
+
+void
+EndSelection(FlatBuffer* fb)
+{
+	fb.sel      = -1;
+	fb.sel_mode = SM.None;
 }
 
 void
@@ -790,14 +840,30 @@ Move(FlatBuffer* fb, Input key, Modifier md)
 		}
 	}
 
-	AdjustOffset(fb);
+	UpdateOffset(fb);
-	U64Vec2 p = VecPos(fb);
+	UpdateSelection(fb);
+
+	Logf("selection %s", fb.sel.v);
 
 	return taken;
 }
 
 void
-AdjustOffset(FlatBuffer* fb)
+UpdateSelection(FlatBuffer* fb)
+{
+	if(fb.sel_mode == SM.Normal)
+	{
+		fb.sel.y = fb.buf_pos;
+	}
+
+	if(fb.sel_mode == SM.Line)
+	{
+		fb.sel.y = CurrentLine(fb);
+	}
+}
+
+void
+UpdateOffset(FlatBuffer* fb)
 {
 	if(fb.rows > 0) with(fb)
 	{

src/editor/editor.d

@@ -22,6 +22,7 @@ debug bool g_frame_continue = false;
 struct EditorCtx
 {
 	Arena      arena;
+	PlatformWindow* window;
 	UIPanel*   base_panel;
 	u64        panel_id;
 	EditState  state;
@@ -61,6 +62,23 @@ struct Editor
 	u64         line_offset;
 }
 
+struct ChangeStacks
+{
+	Arena         arena;
+	u64           current_pos;
+	u8[]          current_str;
+	u64           current_len;
+	EditorChange* undos;
+	EditorChange* redos;
+}
+
+struct EditorChange
+{
+	u8[]          str;
+	u64           pos;
+	EditorChange* next;
+}
+
 struct Command
 {
 	u8[]    name;
@@ -79,6 +97,8 @@ enum CmdType
 	OpenFile,
 	SaveFile,
 	CreateFile,
+	VSplit,
+	HSplit,
 }
 
 alias CT = CmdType;
@@ -148,6 +168,7 @@ InitEditorCtx(PlatformWindow* window)
 	InitUICtx(window);
 
 	EditorCtx ctx = {
+		window: window,
 		arena: CreateArena(MB(2)),
 		cmd: {
 			arena: CreateArena(MB(1)),
@@ -473,6 +494,9 @@ Shift(Modifier md)
 void
 HandleInputs(EditorCtx* ctx, Inputs* inputs)
 {
+	u8[] cb_text;
+	FlatBuffer* fb = !Nil(GetFocusedPanel()) ? &(GetFocusedPanel()).ed.buf : null;
+
 	for(auto node = inputs.list.first; node != null; node = node.next)
 	{
 		bool taken = false;
@@ -480,7 +504,6 @@ HandleInputs(EditorCtx* ctx, Inputs* inputs)
 		Input key      = node.value.key;
 		Modifier md    = node.value.md;
 		bool pressed   = node.value.pressed;
-		FlatBuffer* fb = !Nil(GetFocusedPanel()) ? &(GetFocusedPanel()).ed.buf : null;
 
 		if (pressed)
 		{
@@ -529,8 +552,18 @@ HandleInputs(EditorCtx* ctx, Inputs* inputs)
 						} break;
 					case v:
 						{
-							AddEditor(ctx, GetFocusedPanel(), A2D.X);
+							if(Ctrl(md))
-							taken = true;
+							{
+								cb_text = ClipboardText(ctx.window);
+							}
+							if(Shift(md))
+							{
+								ToggleSelection(fb, SM.Line);
+							}
+							else
+							{
+								ToggleSelection(fb, SM.Normal);
+							}
 						} break;
 					case c:
 						{
@@ -566,6 +599,11 @@ HandleInputs(EditorCtx* ctx, Inputs* inputs)
 	}
 
 	InsertInputToBuf(ctx);
+
+	if(cb_text.length > 0)
+	{
+		Insert(fb, cb_text, cb_text.length);
+	}
 }
 
 void
@@ -721,6 +759,14 @@ GetCommands(CmdPalette* cmd)
 			name: CastStr!(u8)("create"),
 			type: CT.CreateFile,
 		},
+		{
+			name: CastStr!(u8)("vsplit"),
+			type: CT.VSplit,
+		},
+		{
+			name: CastStr!(u8)("hsplit"),
+			type: CT.HSplit,
+		},
 	];
 
 	Reset(&cmd.arena);
@@ -770,16 +816,24 @@ HandleCmdMode(EditorCtx* ctx, InputEvent ev)
 	{
 		case Enter:
 			{
-				if(cmd.current.type == CT.None)
+				if(cmd.current.type == CT.None && cmd.commands.length > 0)
+				{
+					if(cmd.commands[cmd.selected].type == CT.OpenFile)
 					{
 						goto case Tab;
 					}
+					else
+					{
+						cmd.current = cmd.commands[cmd.selected];
+					}
+				}
+
+				UIPanel* p = GetFocusedPanel();
 
 				switch(cmd.current.type)
 				{
 					case CT.OpenFile:
 						{
-							UIPanel* p = GetFocusedPanel();
 							if(!Nil(p) && cmd.selected >= 0 && cmd.selected < cmd.opt_strs.length)
 							{
 								OpenFile(p.ed, cmd.opt_strs[cmd.selected]);
@@ -787,12 +841,15 @@ HandleCmdMode(EditorCtx* ctx, InputEvent ev)
 						} break;
 					case CT.SaveFile:
 						{
-							UIPanel* p = GetFocusedPanel();
 							if(!Nil(p))
 							{
 								SaveFile(p.ed, GetParam(cmd));
 							}
 						} break;
+					case CT.VSplit, CT.HSplit:
+						{
+							AddEditor(ctx, p, cmd.current.type == CT.VSplit ? A2D.X : A2D.Y);
+						} break;
 					default: break;
 				}
 
@@ -800,15 +857,10 @@ HandleCmdMode(EditorCtx* ctx, InputEvent ev)
 			} goto CmdInputEnd;
 		case Backspace:
 			{
-				if(cmd.icount > 0)
+				if(CondIncr!(-1)(cmd.icount > 0, &cmd.icount) && cmd.buffer[cmd.icount] == ' ')
-				{
-					cmd.icount -= 1;
-
-					if(cmd.buffer[cmd.icount] == ' ')
 				{
 					cmd.current = cast(Command)NO_CMD;
 				}
-				}
 			} break;
 		case Space:
 			{
@@ -827,17 +879,11 @@ HandleCmdMode(EditorCtx* ctx, InputEvent ev)
 			} break;
 		case Up:
 			{
-				if(cmd.selected > 0)
+				CondIncr!(-1)(cmd.selected > 0, &cmd.selected);
-				{
-					cmd.selected -= 1;
-				}
 			} break;
 		case Down:
 			{
-				if(cmd.selected < cmd.opt_strs.length-1)
+				CondIncr!(+1)(cmd.selected < cmd.opt_strs.length-1, &cmd.selected);
-				{
-					cmd.selected += 1;
-				}
 			} break;
 		mixin(TextLineCharCases());
 		default: break;

src/editor/ui.d

@@ -129,6 +129,7 @@ struct UICtx
 	UIStack!(f32)*              edge_softness;
 
 	i64                         highlighted_char;
+	I64Vec2                     selected;
 	u32                         tab_width;
 	f32                         text_size;
 
@@ -176,6 +177,7 @@ struct UIItem
 	UISize[2]       size_info;
 	Vec2            adjustment;
 	i64             highlighted_char;
+	I64Vec2         selected;
 
 	// Calculated Parameters
 	Vec4[4]         color;

src/editor/widgets.d

@@ -378,7 +378,16 @@ EditorView(UIPanel* panel)
 
 			Container(ScratchName(panel.id, "lines"), UISize(ST.Percentage, 1.0), UISize(ST.Percentage, 1.0), A2D.Y);
 			{
+				I64Vec2 sel   = ed.buf.sel;
+				if(sel.x > sel.y)
+				{
+					i64 t = sel.y;
+					sel.y = sel.x;
+					sel.x = t;
+				}
+
 				U64Vec2 pos   = VecPos(&ed.buf);
+				SelectMode sm = ed.buf.sel_mode;
 				u64 i         = 0;
 				for(LineBuffer* buf = ed.linebufs.first; buf != null; buf = buf.next, i += 1)
 				{
@@ -395,6 +404,10 @@ EditorView(UIPanel* panel)
 							Push!("highlighted_char")(pos.x);
 						}
 
+						if(sm == SM.Line && line_no >= sel.x && line_no <= sel.y)
+						{
+						}
+
 						TextPart* tp = WrappedTextLine(buf.text, panel.id, text_size, line_no, buf.style);
 						height += (text_size * tp.count);
 						if(TextClicked(tp))