init

CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.20)
+project(editor)
+
+set(CMAKE_CXX_STANDARD 17)
+
+add_executable(editor kilo.cpp)

kilo.cpp

@@ -0,0 +1,78 @@
+/*** Includes ***/
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+
+/** defines ***/
+#define CTRL_KEY(k) ((k) & 0x1f)
+
+
+/*** data ***/
+struct termios orig_termios;
+
+/*** terminal ***/
+void die(const char *s){
+    perror(s);
+    exit(1);
+}
+
+void disableRawMode() {
+    if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) == -1){
+        die("tcsetattr");
+    }
+}
+
+void enableRawMode() {
+    if(tcgetattr(STDIN_FILENO, &orig_termios) == -1) die("tcgetattr");
+
+    atexit(disableRawMode);
+
+    struct termios raw = orig_termios;
+    raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
+    raw.c_oflag &= ~(OPOST);
+    raw.c_cflag |= (CS8);
+    raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
+    raw.c_cc[VMIN] = 0;
+    raw.c_cc[VTIME] = 1;
+    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) die("tcsetattr");
+}
+
+char editorReadKey() {
+    int nread;
+    char c;
+    while ((nread = read(STDIN_FILENO, &c, 1)) != 1){
+        if (nread == -1 && errno != EAGAIN) die("read");
+    }
+    return c;
+}
+
+/*** output ***/
+void editorRefreshScreen() {
+    write(STDOUT_FILENO, "\x1b[2J", 4); // Clear Screen
+    write(STDOUT_FILENO, "\x1b[H",3); // Cursor Position home
+}
+
+
+/*** input ***/
+void editorProcessKeypress() {
+    char c = editorReadKey();
+    switch (c) {
+        case CTRL_KEY('q'):
+            exit(0);
+            break;
+    }
+}
+
+/*** init ***/
+int main() {
+    enableRawMode();
+
+    while(1) {
+        editorRefreshScreen();
+        editorProcessKeypress();
+    }
+    return 0;
+}