M main.c → main.c

@@ -5,12 +5,22 @@ #include <poll.h>
 #include <termios.h>
 #include <unistd.h>
 
-void move_cursor(int direction) {
+void move_cursor(int direction, uint8_t *pos, int len) {
   if (direction == -1) {
+    if (*pos != 0) {
+      *pos -= 1;
+    } else {
+      return;
+    }
     printf("\x0D ");
     printf("\x0D\x1B[1A>");
     printf("\x0D");
   } else if (direction == 1) {
+    if (*pos != len - 1) {
+      *pos += 1;
+    } else {
+      return;
+    }
     printf("\x0D ");
     printf("\x0D\x1B[1B>");
     printf("\x0D");
@@ -36,18 +46,21 @@ }
 
 void return_term(struct termios *old) { tcsetattr(STDIN_FILENO, TCSANOW, old); }
 
-void menu() {
+int menu(char **elements, int len) {
   struct pollfd poller[1];
 
   poller[0].fd = STDIN_FILENO;
   poller[0].events = POLLIN;
 
-  printf(" hallo\n felix\n lass\n minecraft\n spielen\n");
-  printf("\x1B[5A>\x0D");
+  for (int i = 0; i < len; i++) {
+    printf(" %s\n", elements[i]);
+  }
+
+  printf("\x1B[%dA>\x0D", len);
   fflush(stdout);
 
-  uint8_t run = 1;
-  while (run) {
+  uint8_t pos = 0;
+  while (1) {
     int events = poll(poller, 1, -1);
     if (events > 0 && poller[0].revents & POLLIN) {
       char buffer[10];
@@ -56,14 +69,20 @@ if (length > 0) {
         uint8_t i;
         for (i = 0; i < length; i++) {
           if (buffer[i] == 'q')
-            run = 0;
+            return -1;
           else if (buffer[i] == 'j') {
-            move_cursor(1);
+            move_cursor(1, &pos, len);
           } else if (buffer[i] == 'k') {
-            move_cursor(-1);
+            move_cursor(-1, &pos, len);
+          } else if (buffer[i] == 'o') {
+            return pos;
           }
         }
+      } else {
+        return -1;
       }
+    } else {
+      return -1;
     }
   }
 }
@@ -71,8 +90,15 @@
 int main() {
   struct termios old = setup_term();
 
-  menu();
+  static char *elements[] = {"hi", "hello", "what's up"};
+
+  int seli = menu(elements, 3);
+  if (seli < 0) {
+    printf("ERROR: menu failed");
+    return 1;
+  }
 
   return_term(&old);
+  printf("%s", elements[seli]);
   return 0;
 }