pet: Your Personal Expenses Tracker | Together C & C++ | Page 1

hexed spruce Jul 16, 2024, 1:32 PM

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Hello everyone 👋 so, sometime back I made a graphical program to help people in recording their daily expenses. It stores the expenses in a SQLite3 database and uses Nuklear for its UI
Recently I made QoL improvements to it but yk, with every project, without users, it vanishes,
So, the project is open source under the zlib license (similar to GLFW's)

https://codeberg.org/limisi/pet

Check it out and tell me whatchu think 🙃

if you just want to have a feel of the UI you can check out the documentation of a previous version here
https://limisi.srht.site/docs/pet_v2_user_manual.html (includes screen shots 🙃)

rn, I'm looking to add encryption and authentication 'cause its financial data so it should be secure by default, but I'd really like help with this 😄

other than that I'm working on being able to filter expenses by date range

finally, I need a system to enable people to add, edit or delete tags

so yeah, kindly do check it out and tell me what comes to you, I want as much scrutiny as possible on code quality 😤💪 do not hold back, I wish to improve

Also if you have ideas of how things can be done different, do tell me

Also, if you find any bugs/ inconsistencies 😤 let me at 'em 😤, they will be squashed (if my skill issues permit 😱)

Codeberg.org

pet

A lightweight graphical desktop app to keep track of your expenses.

hexed spruce Jul 23, 2024, 7:18 AM

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I added a link to a video demo: https://www.youtube.com/watch?v=Pj-LODYVz14

YouTube

Emmanuel Limisi

pet v2.5 changes demo

A demonstration of what is new in pet v2.5, particularly with updating and deleting expenses.

▶ Play video

vernal junco Jul 23, 2024, 4:22 PM

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very nice!

hexed spruce Jul 23, 2024, 4:57 PM

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vernal junco very nice!

Thank youu!

hexed spruce Aug 25, 2024, 5:16 PM

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Roadmap

Implement password, user authentication and partial encryption using monocypher for string encryption
write platform specific random number generation code to jumble prices when stored (unless a library already exists for this)
write out UI for tags and tags operations (add, edit and delete)
add analytics which allows you to see a graph of tags against money and can be filtered using dates
analytics: allow someone to see graph of how much they've spent on an item over a time period

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With these down, a version 3.0 can be released

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Analytics design mockup

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Tags UI and new settings window mockup

hexed spruce Aug 27, 2024, 6:18 PM

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Got UI shifting to work 😁

hexed spruce Aug 29, 2024, 9:22 AM

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adding tags is now supported 😁

hexed spruce Aug 29, 2024, 2:56 PM

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Now supports editing tags 😁 (i.e updating and deleting)

mild flame Sep 20, 2024, 1:02 PM

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;compile -O2 -march=znver3 -mtune=znver3 -std=gnu23

#include <stdio.h>
int days_in_month (int y, int m)
{
    return (0x3f & 0x3bbeedc)
           + (((0x3bbeedc ^ (((y & 0x3) || !(y % 0x64)
           && (y % 0x190)) << 4)) >> (m << 1)) & 0x3);
}

int main(void) {
    printf("%d\n", days_in_month(1900, 2));
}

vestal tapirBOT Sep 20, 2024, 1:02 PM

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Program Output

mild flame Sep 20, 2024, 1:05 PM

#

;compile -O2 -march=znver3 -mtune=znver3 -std=gnu23

#include <stdio.h>
int days_in_month (int y, int m)
{
    return (0x3f & 0x3bbeedc)
           + (((0x3bbeedc ^ (((y & 0x3) || !(y % 0x64)
           && (y % 0x190)) << 4)) >> (m << 1)) & 0x3);
}

int main(void) {
    printf("%d\n", days_in_month(2000, 2));
}

vestal tapirBOT Sep 20, 2024, 1:05 PM

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Program Output

mild flame Sep 20, 2024, 1:06 PM

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let me deobfuscate a bit

hexed spruce Sep 20, 2024, 1:13 PM

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However what makes it wrong though ?

mild flame Sep 20, 2024, 1:22 PM

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;compile -O2 -march=znver3 -mtune=znver3 -std=gnu23

#include <stdio.h>
int days_in_month (int year, int month)
{
    unsigned y = year;
    unsigned m = month;
    return 28U + (
        0x03U & (
            0x3bbeedcU ^ (
                ((y & 0x3U)  ||
                !(y % 100U)  &&
                 (y % 400U)) << 4U
            )
        ) >> (m << 1U)
    );
}

int main(void) {
    printf("%d\n%d\n%d\n%d\n%d\n%d\n%d\n%d\n%d\n%d\n%d\n%d\n",
           days_in_month(2000,  1), days_in_month(2000,  2), days_in_month(2000,  3),
           days_in_month(2000,  4), days_in_month(2000,  5), days_in_month(2000,  6),
           days_in_month(2000,  7), days_in_month(2000,  8), days_in_month(2000,  9),
           days_in_month(2000, 10), days_in_month(2000, 11), days_in_month(2000, 12));
}

vestal tapirBOT Sep 20, 2024, 1:23 PM

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Program Output

mild flame Sep 20, 2024, 1:23 PM

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hmm guess i didn't break it

mild flame Sep 20, 2024, 1:23 PM

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hexed spruce However what makes it wrong though ?

you don't use the 100 and 400 year rule

#

;compile -O2

#include <stdbool.h>
#include <stdio.h>
static int
days_in_month (unsigned y,
               unsigned m)
{
    return 28U + (
        0x03U & (
            0x3bbeedcU ^ (
                ((y & 0x3U)  ||
                !(y % 100U)  &&
                 (y % 400U)) << 4U
            )
        ) >> (m << 1U)
    );
}

static bool
date_is_valid (int year,
               int month,
               int day)
{
    return year >= 1 && month >= 1 && month <= 12 && day >= 1 &&
           day <= days_in_month((unsigned)year, (unsigned)month);
}

int main(void) {
    int d[] = {2024, 9, 20};
    printf("%d-%02d-%02d is %svalid\n", d[0], d[1], d[2],
           date_is_valid(d[0], d[1], d[2]) ? "" : "in");
}

vestal tapirBOT Sep 20, 2024, 1:36 PM

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Program Output

2024-09-20 is valid

hexed spruce Sep 20, 2024, 5:23 PM

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mild flame you don't use the 100 and 400 year rule

I do though ... int leap_year = (!(year % 4) && ((year % 100))) || !(year % 400);

mild flame Sep 20, 2024, 6:35 PM

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hexed spruce I do though ... ``int leap_year = (!(year % 4) && ((year % 100))) || !(year % 40...

I might have missed that, but i thought i didn't see it

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https://codeberg.org/limisi/pet/src/commit/ad5e500b82aa65dab89df240b83299b519977c83/dates.c#L46 it's not here

Codeberg.org

pet/dates.c at ad5e500b82aa65dab89df240b83299b519977c83

hexed spruce Sep 20, 2024, 6:43 PM

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mild flame I might have missed that, but i thought i didn't see it

Ahh, great catch

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That didn' cross my mind actually

mild flame Sep 20, 2024, 6:49 PM

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Btw feel free to use my totally self-documenting and not cursed implementation. It's the same exact formula but uses a lookup table where each month length info is a 2-bit field

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Conveniently 0b11 == 3 == 31-28

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So you can fit all 12 in 24 bits

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;compile -O2

#include <stdbool.h>
#include <stdio.h>

static int
days_in_month (unsigned y,
               unsigned m)
{
    return (int)(28U + (
        0x03U & (
            0x3bbeedcU ^ (
                ((y & 0x3U)  ||
                !(y % 100U)  &&
                 (y % 400U)) << 4U
            )
        ) >> (m << 1U)
    ));
}

static bool
date_is_valid (int year,
               int month,
               int day)
{
    return year >= 1 && month >= 1 && month <= 12 && day >= 1 &&
           day <= days_in_month((unsigned)year, (unsigned)month);
}

int main(void) {
    int d[] = {2024, 9, 20};
    printf("%d-%02d-%02d is %svalid\n", d[0], d[1], d[2],
           date_is_valid(d[0], d[1], d[2]) ? "" : "in");
}