From 99142b0661ba8f54e1ff8dda035c67be54cac6a6 Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Mon, 9 Jan 2017 14:16:28 +0100
Subject: Backspace/delete and end-of-line cursor fix

---
 buffer.cpp | 34 ++++++++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

(limited to 'buffer.cpp')

diff --git a/buffer.cpp b/buffer.cpp
index f213e2f..cc93e00 100644
--- a/buffer.cpp
+++ b/buffer.cpp
@@ -16,6 +16,8 @@ Buffer::Buffer(Manager *manager)
 	:manager(manager){}
 
 void Buffer::receive(const Command &cmd){
+	//TODO: optimise the renewLayout's in this function
+
 	if(cmd[0]=="open_file"){
 		const string &fname=cmd[1];
 		filename=fname;
@@ -33,17 +35,37 @@ void Buffer::receive(const Command &cmd){
 			tb.insert(cursor.line,cursor.x,cmd[1][0]);
 			cursor.x++;
 		}
-		//TODO: optimise this
 		renewLayout(screen[0].line,screen[0].part,lastWidth,lastHeight);
 	} else if(cmd[0]=="insert_newline"){
 		tb.insert(cursor.line,cursor.x,'\n');
 		cursor.x=0;
 		cursor.line++;
-		//TODO: optimise this
 		renewLayout(screen[0].line,screen[0].part,lastWidth,lastHeight);
+	} else if(cmd[0]=="delete_backward"){
+		if(cursor.x==0&&cursor.line==0){
+			bel();
+		} else {
+			if(cursor.x>0){
+				cursor.x--;
+				tb.erase(cursor.line,cursor.x);
+			} else {
+				cursor.line--;
+				cursor.x=tb.lineLen(cursor.line);
+				tb.erase(cursor.line,cursor.x);
+			}
+			renewLayout(screen[0].line,screen[0].part,lastWidth,lastHeight);
+		}
+	} else if(cmd[0]=="delete_forward"){
+		if(cursor.line==tb.numLines()-1&&cursor.x==tb.lineLen(cursor.line)){
+			bel();
+		} else {
+			tb.erase(cursor.line,cursor.x);
+			renewLayout(screen[0].line,screen[0].part,lastWidth,lastHeight);
+		}
 	} else {
 		THROW("Unknown command");
 	}
+	cerr<<"New cursor is (line="<<cursor.line<<", x="<<cursor.x<<")"<<endl;
 }
 
 static string showChar(char c){
@@ -234,6 +256,14 @@ void Buffer::show(i64 atx,i64 aty,i64 width,i64 height){
 			}
 			screenX++;
 		}
+
+		//Maybe the cursor should be positioned AFTER this line
+		if(curScreenX==-1&&screen[y].line==cursor.line&&cursor.x==tb.lineLen(cursor.line)&&
+		   (y==(i64)screen.size()-1||screen[y+1].line>cursor.line)){
+			if(screenX==atx+width)curScreenX=screenX-1;
+			else curScreenX=screenX;
+			curScreenY=aty+y;
+		}
 	}
 	setstyle(&textStyle);
 	if(y<height)fillrect(atx,aty+y,width,height-y,' ');
-- 
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