cli handler pr

[BAOELIETRAN]

Pull request name goes here

• What:

Handling the prompt from user

• Whenever user run the file with a random argument, a prompt will pop up.

• Declare new function smoldb_input_buf_read to put the content of the user's input into the buffer of the InputBuf struct, and also set the length of the buffer.

• Declare new function prompt_prototype to receive the check the argument, read the user's input, and handle the request.

• Why:

Declare new functions for the prototype of the prompt.

• How:

Declare new functions, and handle the edge cases of the prompt, such as if user type "mogging", the program will exit.

• Misc:

I think we should discuss how to make the prompt more colorful and interesting, like moving figure or sth?

• Tags:

@huynguyen-and-friend-projects/everyone

---

Pull request by: Bao Ngo

[nguyenhuy0905]

Here's a random trick to create colorful prompt: use ANSI escape codes. Imma just "steal" my old code and paste it here:

#define RESET_ALL "\033[0m"

/* List of colors */

#define BLACK "\033[30m"
#define RED "\033[31m"
#define GREEN "\033[32m"
#define YELLOW "\033[33m"
#define BLUE "\033[34m"
#define MAGNETA "\033[35m"
#define CYAN "\033[36m"
#define WHITE "\033[37m"
#define DEFAULT_COLOR "\033[39m"

/* List of formats */

#define BOLD "\033[1m"
#define DIM "\033[2m"
#define ITALIC "\033[3m"
#define UNDERLINE "\033[4m"
#define STRIKETHROUGH "\033[9m"

How you would use these is like so: Say you want to print "Hello World" in red,

printf("\033[31m" "Hello World\n" "\033[0m");

or, if you paste all the #defines above into your source code:

printf(RED "Hello World\n" RESET_ALL);

The "\033[0m" (aka, RESET_ALL in this case) is important, otherwise, the next printf will still show red even though you didn't specify a color.

EDIT: sometimes you see people use \x1b instead of \033 as the prefix. It will yield the same result, so far as I'm aware, anyways.

[nguyenhuy0905]

Another trick, here's how you would make a progress bar:

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
    uint progress = 0;
    while(progress <= 100){
        printf("\r%d%%  ", progress);
        for(int i = 0; i <= progress; i += 10){
            printf("#");
        }
        progress += 10;
        sleep(1);
        fflush(stdout);
    }
    printf("\n");

    return EXIT_SUCCESS;
}

The output is something of:

30% ###

On Windows machine, change the unistd include to windows, and change sleep to Sleep. Although, I dunno what we may be using a progress bar for.

[nguyenhuy0905]

It's quite disheartening to say this, and maybe I'm too strict here, but the animation, while cool, doesn't enhance user experience, but kinda hammers it, due to the loading time. :disappointed:

Also, print functions are considered very "expensive" on the processor, due to it being a syscall.

If you're a recruiter, you would prefer more practical tools, right? :smile:

There are some minor issues like memory leaks, which I can fix for you. But the big ones, like animation, is up to your decision. Were it me, I would save the changes on a different branch first, then change this branch's code to be more pragmatic. That way, you won't lose the cool stuff.

Lastly, I think we shall remove the "explanatory" comments? These ones:

I suggest that, the parts of the code you don't understand, you should copy that part of the code into a, say, text file. I prefer Markdown because you can get syntax-highlighting like this:

std::print("Isn't it cool that we get some syntax highlights?");
while(true){
  SomeClassToCauseMemLeak* evil = new SomeClassToCauseMemLeak;
}

Then, write a detailed explanation below the code snippet.

Anyways, really nice effort!

[nguyenhuy0905]

@BAOELIETRAN also, check my implementation of BTree. I got it working (halfway) already. Thanks a lot for your motivation to write this hell of a data structure. Your implementation (as well as mine) is of course, not perfect, but still, that gave me the motivation necessary. It took me a few days and 2 rewrites just to get search() and insert() on mine work properly.

I just force-push my BTree implementation onto a separate repository in this organization lol.

Here's the link to my BTree implementation

[nguyenhuy0905]

@BAOELIETRAN in case you're still working on this PR. You have a merge conflict here, unfortunately :disappointed:. Before you proceed, you should resolve the merge conflicts first.