Supporting the backspace

include/key_functions.h

@@ -26,6 +26,10 @@ typedef struct binding
 extern const key_function_t key_functions[];
 extern const binding_t emacs_bindings[];
 
+int buffer_get_display_pos(buffer_t *buffer);
+
+
 int self_insert_command(int key, buffer_t *buffer, env_t *env);
 int newline_command(int key, buffer_t *buffer, env_t *env);
-int eof_command(int key, buffer_t *buffer, env_t *env);
+int eof_command(int key, buffer_t *buffer, env_t *env);
+int backward_delete_char_command(int key, buffer_t *buffer, env_t *env);

src/key_bindings/basic_typing_functions.c

@@ -34,6 +34,18 @@ int self_insert_command(int key, buffer_t *buffer, env_t *env)
     return (0);
 }
 
+int backward_delete_char_command(int key, buffer_t *buffer, env_t *env)
+{
+    int len = buffer->buffer ? strlen(buffer->buffer) : 0;
+
+    if (buffer->pos == 0)
+        return (0);
+    buffer->pos--;
+    for (int i = buffer->pos; i < len; i++)
+        buffer->buffer[i] = buffer->buffer[i + 1];
+    return (0);
+}
+
 int newline_command(int key, buffer_t *buffer, env_t *env)
 {
     int ret;

src/key_bindings/default_bindings.c

@@ -14,11 +14,14 @@ const key_function_t key_functions[] = {
     {"self-insert-command", &self_insert_command},
     {"newline", &newline_command},
     {"enf-of-file", &eof_command},
+    {"backward-delete-char", &backward_delete_char_command},
     {NULL, NULL}
 };
 
 const binding_t emacs_bindings[] = {
     {'\n', &newline_command},
     {CTRL('d'), &eof_command},
+    {127, &backward_delete_char_command},
+    {KEY_BACKSPACE, &backward_delete_char_command},
     {0, NULL}
 };

src/shell.c

@@ -73,6 +73,7 @@ void start_shell(env_t *env)
             refresh();
             y = getcury(env->window);
             mvaddstr(y, buffer.startx, buffer.buffer);
+            clrtoeol();
             move(y, buffer_get_display_pos(&buffer));
             key = getch();
         } else