From 061ddbc5b57ef38de6e49efb5e855ca57ab44cf6 Mon Sep 17 00:00:00 2001
From: Timothy Warren <twarren@nabancard.com>
Date: Tue, 20 Aug 2019 09:03:04 -0400
Subject: [PATCH] Enable entering some characters

---
 kilo.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/kilo.c b/kilo.c
index a818810..1c0ec8b 100644
--- a/kilo.c
+++ b/kilo.c
@@ -24,6 +24,7 @@
 #define CTRL_KEY(k) ((k) & 0x1f)
 
 enum editorKey {
+	BACKSPACE = 127,
 	ARROW_LEFT = 1000,
 	ARROW_RIGHT,
 	ARROW_UP,
@@ -312,6 +313,32 @@ void editorAppendRow(char *s, size_t len)
 	E.numrows++;
 }
 
+void editorRowInsertChar(erow *row, int at, int c)
+{
+	if (at < 0 || at > row->size)
+	{
+		at = row->size;
+	}
+
+	row->chars = realloc(row->chars, row->size + 2);
+	memmove(&row->chars[at + 1], &row->chars[at], row->size - at + 1);
+	row->size++;
+	row->chars[at] = c;
+	editorUpdateRow(row);
+}
+
+/*** editor operations ***/
+
+void editorInsertChar(int c)
+{
+	if (E.cy == E.numrows)
+	{
+		editorAppendRow("", 0);
+	}
+	editorRowInsertChar(&E.row[E.cy], E.cx, c);
+	E.cx++;
+}
+
 /*** file i/o ***/
 void editorOpen(char *filename)
 {
@@ -603,6 +630,10 @@ void editorProcessKeypress()
 
 	switch (c)
 	{
+		case '\r':
+			/* TODO */
+		break;
+
 		case CTRL_KEY('q'):
 			write(STDOUT_FILENO, "\x1b[2J", 4);
 			write(STDOUT_FILENO, "\x1b[H", 3);
@@ -620,6 +651,12 @@ void editorProcessKeypress()
 			}
 		break;
 
+		case BACKSPACE:
+		case CTRL_KEY('h'):
+		case DEL_KEY:
+			/* TODO */
+		break;
+
 		case PAGE_UP:
 		case PAGE_DOWN: {
 			if (c == PAGE_UP)
@@ -649,6 +686,14 @@ void editorProcessKeypress()
 		case ARROW_RIGHT:
 			editorMoveCursor(c);
 		break;
+
+		case CTRL_KEY('l'):
+		case '\x1b':
+			break;
+
+		default:
+			editorInsertChar(c);
+		break;
 	}
 }