Minor program improvements

src/kernel/kmain.c

@@ -33,6 +33,7 @@ int kmain(int retvalue)
   clear();
 
   colorputs(ascii_title, 10);
+  colorputs("   by @xamidev - star the repo for a cookie!\n\n", 11);
 
   // TODO: Grub modules to load programs
   

src/kernel/shell.c

@@ -21,7 +21,7 @@ void shell_install()
     }
     else if (strcmp(input_buffer, "help") == 0)
     {
-        printf("This is the Blank Operating System\ndesigned for fun by xamidev\n\nCommand help:\n\n\thelp - shows this message\n\tpanic - makes the kernel panic\n\twords - generates random words\n\tprimes - computes prime numbers\n");
+        printf("help\tpanic\twords\tprimes\trainbow\tclear\n");
     }
     else if (strcmp(input_buffer, "panic") == 0)
     {
@@ -35,6 +35,14 @@ void shell_install()
     {
 	    program_primes();
     }
+    else if (strcmp(input_buffer, "rainbow") == 0)
+    {
+	program_rainbow();
+    }
+    else if (strcmp(input_buffer, "clear") == 0)
+    {
+	program_clear();
+    }
     else {
 	printf("Unknown command %s\n", input_buffer);
     }

src/programs/misc.c

@@ -0,0 +1,31 @@
+// Miscellaneous small programs
+
+#include "../libc/stdio.h"
+
+// Print a rainbow colorful text for testing
+
+#define BUF_SIZE 256
+#define COLORS 20
+
+void program_rainbow()
+{
+	char input_buffer[BUF_SIZE];
+	puts("What to print? ");
+	get_input(input_buffer, BUF_SIZE);	
+	puts("\n");
+
+	for (int i=0; i<COLORS; i++)
+	{
+		colorputs(input_buffer, i);
+		puts("\n");
+	}	
+}
+
+// Clear the terminal
+
+#define ROWS 25
+
+void program_clear()
+{	
+	for (int i=0; i<ROWS; i++) scroll(1);
+}

src/programs/primes.c

@@ -1,5 +1,6 @@
 #include "../libc/stdint.h"
 #include "../libc/stdio.h"
+#include "../kernel/system.h"
 
 #define PRIMES_MAX 1000000
 
@@ -18,6 +19,7 @@ void program_primes()
 		{
 				printf("%d ", x);	
 		}
+		delay(2);
 	}
 	puts("\n");
 }

src/programs/programs.h

@@ -4,4 +4,7 @@
 void program_words();
 void program_primes();
 
+// Misc
+void program_rainbow();
+void program_clear();
 #endif