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Mathematics and computer science

locatepm

By Daniel Șuteu February 20, 2012

Find installed Perl modules matching a regular expression. It's very fast and efficient.

Download: https://github.com/trizen/perl-scripts/blob/master/Finders/locatepm

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Daniel Șuteu

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YouTube Viewer

By Daniel Șuteu March 02, 2012

# GTK YouTube Viewer This application came to life in 12 September 2010 as my first GTK2/Glade learning project.

Its scope is to search and play YouTube videos in a native player. It comes with various search options; it can search for videos, playlists and/or channels. The videos are streamed directly in a selected video player at the best resolution (customizable) and with closed-captions (if available).

By default, the application comes with support for three video players: MPV (recommended), MPlayer and VLC, and it allows the addition of more players inside the configuration file.

For a better experience, the application also comes with built-in authentication support, using the OAuth 2.0 mechanism. After inserting the authentication token, a new tab will appear, named "My panel", which has the following buttons:
SubscriptionsFavorited videosLiked videosDisliked videosUploadsLog outFor more details (+screenshots), see also:
http://www.webupd8.org/2015/02/youtube-viewer-comp…

obmenu-generator

By Daniel Șuteu February 21, 2012

obmenu-generator is a simple, lightweight, easily configurable Perl script that generates a full Openbox XML-menu based upon the information present in *.desktop application files (related to fbmenugen and menutray).

It has full support for icons (respecting the current icon theme) and can generate either a static or a dynamic menu.

The parsing of the *.desktop files is provided by the Linux::DesktopFiles module.

In a dynamic menu, the entries are updated automatically when a new application is installed or when the current icon theme is changed by the user.

Starting with version 0.61, obmenu-generator introduced a new smart-cache system which will store all the required data from the *.destkop files in a new cache.db file, which is also updated automatically when a new application is (re)installed or when the config.pl or schema.pl are changed. With the new cache-system in place, a full menu with icons is generated in ~8ms (compared to ~60ms before).

In version 0.80, we introduced ye…

Partial sums of arithmetical functions

By Daniel Șuteu November 25, 2018

In this post I would like to present some interesting generalized formulas for computing the partial sums of some arithmetical functions.

Interesting exercises and identities in number theory

By Daniel Șuteu August 19, 2018

In this post I would like to present some interesting exercises in number theory, along with some curious formulas and identities for some number-theoretic functions.

alsi

By Daniel Șuteu August 10, 2012

alsi is a system information tool, designed for Arch Linux, related to archey and screenfetch, but more configurable.

All the configuration files are in: ~/.config/alsi

For example, to configure it for Gentoo, get the gentoo logo and put it in alsi.logo file, change something in alsi.output and alsi.conf files (if necessary) and then execute: alsi -f -l -c1=blue -c2=purple

Result:

1. Changing alsi.output:

my$b="\b\b\b\b";[{HARDCODED=>"\b\e[1;37m\e[41mTHIS IS ALSI\e[0m"},{OS=>$b.'%13sOS:%s %s'},# Operating system{HOSTNAME=>$b.'%4sHostname:%s %s'},# Hostname{UPTIME=>$b.'%9sUptime:%s %s'},# Uptime{KERNEL=>$b.'%9sKernel:%s %s'},# Kernel version{SHELL=>$b.'%10sShell:%s %s'},# Shell{PACKAGES=>$b.'%sPackages:%s %s'},# Number of installed packages{WM_DE=>$b."%13s%s:%s %s"},# WM or DE{GTK2_THEME=>$b.'%10sTheme:%s %s'},# Gtk2 theme{GTK2_ICON_THEME=>

obbrowser

By Daniel Șuteu December 29, 2012

obbrowser is a very simple script which displays files and directories in the Openbox menu. It recursively browse the filesystem through openbox3 pipe menus. (related to fbrowse-tray)

The following line needs to be added inside the menu.xml file:
<menu id="obbrowser /my/dir" label="Disk" execute="obbrowser"/>

Or, if you are using the obmenu-generator, add the following line inside the schema.pl file:
{pipe => ['obbrowser /my/dir', 'Disk', 'drive-harddisk']},

The script supports a large variety of icons, thanks to File::MimeInfo module.

Github: https://github.com/trizen/obbrowser
AUR link: https://aur.archlinux.org/packages/obbrowser/

Simple version, in C++:
https://github.com/trizen/cpp-learning/blob/master/openbox-pipefs.cpp

Simpler version, in Go:
https://github.com/trizen/go-learning/blob/master/openbox-pipefs.go

menutray

By Daniel Șuteu February 21, 2012

Menutray is a simple menu generator (related to obmenu-generator and fbmenugen).

It generates a Perl script containing all the applications from the /usr/share/applications directory, ordered on categories. It also provides a schema file for customization.

Starting with version 0.42, menutray supports Gtk3 with the --gtk3 option.

Github: https://github.com/trizen/menutray
AUR Link: https://aur.archlinux.org/packages/menutray/

Continued fraction factorization method

By Daniel Șuteu October 28, 2018

Prime factorization of composite integers has many applications in number theory, especially in computing some important arithmetic functions for large inputs.

One such function is the Euler's totient function `φ(n)`, which it's practically impossible to compute for very large composite values of `n`, if the prime factorization of `n` is not known.

This led to the creation of public-key cryptography systems (such as the RSA algorithm), which are systems responsible for secure communication online and rely on the assumption that it's very hard to factorize a large integer `n` that is the product of two large random prime numbers.

The publication of the RSA algorithm led to an increasing interest in factoring large integers, which also resulted in the creation of several new factorization algorithms, none of which, however, is able to efficiently factorize an RSA modulo of more than `1024` bits.

fbmenugen

By Daniel Șuteu February 21, 2012

fbmenugen is a simple menu generator for the Fluxbox WM (related to menutray and obmenu-generator).

It generates a valid Fluxbox menu file with the applications from the /usr/share/applications directory, ordered on categories. It also provides a configuration file that allows the user to customize the menu.

Github: https://github.com/trizen/fbmenugen
AUR Link: https://aur.archlinux.org/packages/fbmenugen/

Creating a programming language

By Daniel Șuteu August 23, 2015

In this post we're going to look over the main things required in designing and implementing a programming language.

# Overview Before writing any code and before designing any language construct, we need to think about the core of the language that we want to create. The core of the language is the most important part which defines the language itself.

We also have to choose a programming paradigm for our language from the following list:
imperativedeclarativefunctionalobject-orientedprocedurallogicsymbolic
A language can have more than one paradigm. For example, it can be imperative and object-oriented at the same time. This are called multi-paradigm languages.

After this two criteria are met, we can start thinking about a syntax for our language and begin carefully to design language constructs and implement them.
In order to implement our programming language, we need to write a parser which creates an abstract syntax tree (AST) from our source code. The abstract syntax tree is…

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