feat: add support for shell builtins to command completion

programs/src/shell/tabcompletion.cpp

@@ -6,6 +6,7 @@
 
 #include <montauk/string.h>
 #include <montauk/syscall.h>
+#include "shell.h"
 
 #define RD_MAX 128
 
@@ -58,6 +59,7 @@ int get_completions(		// returns no. of results
 		int	arrayMax
 	) {
 	
+	// --- System commands (0:/os/*.elf) ----
 	const char* names[RD_MAX] 	= { };
 
 	int n = montauk::readdir("0:/os", names, RD_MAX);
@@ -89,5 +91,19 @@ int get_completions(		// returns no. of results
 		} 
 	}
 
+	// ---- Shell builtins ----
+	
+	size_t builtins_count = sizeof(shell_builtins) / sizeof(const char*);
+
+	for (size_t i = 0; i < builtins_count; i++) {
+		if (montauk::starts_with(shell_builtins[i], (const char*)string)) {
+			if (r > arrayMax)
+				break;
+			
+			array[r] = (char *)shell_builtins[i];
+			r++;
+		}
+	}
+
 	return r;
 }