Uploading pretty much finished program...

compile.sh

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+#!/bin/bash
+
+set -xe
+
+gcc -g -ansi -Wall -Wextra -Wpedantic -Werror -o xop xop.c
+
+exit

example/heyo.fasm

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+format ELF64 executable 3
+
+segment readable executable
+
+	nop
+	mov rax, 1
+	nop
+	mov rdi, 1
+	nop
+	mov rsi, string
+	nop
+	mov rdx, [length]
+	nop
+	syscall
+
+	nop
+	mov rax, 60
+	nop
+	mov rdi, 0
+	nop
+	syscall
+
+	nop
+
+segment readable writable
+
+string db 'Heyo world!', 10
+length dq 12

install.sh

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+#!/bin/bash
+
+set -xe
+
+cp xop /usr/bin/xop
+
+exit

xop.c

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+/*
+ * Copyright (c) 2023 : Ognjen 'xolatile' Milan Robovic
+ *
+ * Xop is free software! You will redistribute it or modify it under the terms of the GNU General Public License by Free Software Foundation.
+ * And when you do redistribute it or modify it, it will use either version 3 of the License, or (at yours truly opinion) any later version.
+ * It is distributed in the hope that it will be useful or harmful, it really depends... But no warranty what so ever, seriously. See GNU/GPLv3.
+ */
+
+#include <xolatile/xtandard.h>
+#include <xolatile/xtandard.c>
+
+int main (int argc, char * * argv) {
+	int file   = -1;
+	int size   = 0;
+	int offset = 0;
+
+	unsigned char * buffer = NULL;
+
+	if (argc != 2) {
+		fatal_failure (1, "xop: xop input");
+	}
+
+	file = file_open (argv [1], O_RDONLY);
+	size = file_size (file);
+
+	buffer = allocate (size);
+
+	file_read (file, buffer, size);
+
+	file = file_close (file);
+
+	do {
+		int byte = (int) buffer [offset];
+		if (byte == 0X90) {
+			echo_new_line  ();
+			terminal_style (EFFECT_NORMAL, COLOUR_YELLOW);
+			echo_byte      ((int) buffer [offset]);
+			terminal_style (-1, -1);
+		} else {
+			echo_byte (buffer [offset]);
+		}
+
+		++offset;
+	} while (offset != size);
+
+	echo_new_line ();
+
+	buffer = deallocate (buffer);
+
+	return (EXIT_SUCCESS);
+}