From 66b97546e27ab481608595b308c8607998f799a5 Mon Sep 17 00:00:00 2001
From: Aaron Fischer <aaron.fischer@marbis.net>
Date: Fri, 5 Oct 2018 11:29:30 +0200
Subject: [PATCH] Make the editor insert text!

---
 kilo.c | 44 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 41 insertions(+), 3 deletions(-)

diff --git a/kilo.c b/kilo.c
index a3f872c..20cb239 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,
@@ -201,13 +202,13 @@ void editorUpdateRow(erow *row) {
   }
 
   free(row->render);
-  row->render = malloc(row->size + tabs*(KILO_TAB_STOP-1) + 1);
+  row->render = malloc(row->size + tabs*(KILO_TAB_STOP - 1) + 1);
 
   int idx = 0;
   for (j=0; j<row->size; j++) {
     if (row->chars[j] == '\t') {
       row->render[idx++] = ' ';
-      while (idx%KILO_TAB_STOP != 0) row->render[idx++] = ' ';
+      while (idx % KILO_TAB_STOP != 0) row->render[idx++] = ' ';
     } else {
       row->render[idx++] = row->chars[j];
     }
@@ -232,6 +233,26 @@ 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) {
@@ -277,7 +298,7 @@ void abFree(struct abuf *ab) {
 /*** output ***/
 
 void editorScroll() {
-  E.rx = E.cx;
+  E.rx = 0;
   if (E.cy < E.numrows) {
     E.rx = editorRowCxToRx(&E.row[E.cy], E.cx);
   }
@@ -435,6 +456,10 @@ void editorProcessKeypress() {
   int c = editorReadKey(); // Blocking!
 
   switch (c) {
+    case '\r':
+      /* TODO */
+      break;
+
     case CTRL_KEY('q'):
       write(STDOUT_FILENO, "\x1b[2J", 4);
       write(STDOUT_FILENO, "\x1b[H", 3);
@@ -451,6 +476,12 @@ void editorProcessKeypress() {
       }
       break;
 
+    case BACKSPACE:
+    case CTRL_KEY('h'):
+    case DEL_KEY:
+      /* TODO */
+      break;
+
     case PAGE_UP:
     case PAGE_DOWN:
       {
@@ -472,6 +503,13 @@ void editorProcessKeypress() {
       editorMoveCursor(c);
       break;
 
+    case CTRL_KEY('l'):
+    case '\x1b':
+      break;
+
+    default:
+      editorInsertChar(c);
+      break;
   }
 }