android file transfer on linux (mtp)

mtp through kde is not working properly, so use:

 sudo apt-get install android-file-transfer

Mercurial (hg), git, subversion (svn) repository size comparison

Compared git, mercurial, and subversion for local-only repository to use for local history of notes, and other personal non-shared files, e.g. financial log, for which the edit history is useful. 

 Mercurial turned out to be the most space efficient, especially for binary files. For subversion there's also overhead for local working copy tracking, which is a copy, so your working copy occupies 2x space + repository space. 

Empty repository sizes (with du command): 

116K .git/ 9 directories, 17 files 

28K .hg 3 directories, 3 files

empty svn repo du: 160K, 10 directories, 28 files 

140K .svn/ 

After adding a gimp .xcf 45M file, each new commit increases git's and svn's repositories to almost the same size, as if each commit contains an individual copy, while the hg repo increases slightly as if only a binary diff is stored. After two edits the repository sizes are: 

git: 91M

hg: 39M

svn: 129M 

So Mercurial is a clear winner here, and suitable for binary data without LFS-like hacks.

Steam on Linux xbox controller troubleshooting

If the gamepad is not detected or controller buttons are not working as expected in the game  try to use the following settings.

Right click on game name in the list, choose CONTROLLER tab, click Controller General Settings, mark "Xbox configuration support", click "Back". In the OVERRIDE FOR <game name> select "Use default settings". In the list below: Xbox Controller Enabled, default setting.

In the GENERAL tab make sure "Enable the Steam Overlay while in-game" is enabled (click to trigger it off/on just to make sure it works).

Now games such as Blasphemous, Broforce will work with the gamepad as expected.

neovim setup for development, beancount

https://neovim.io/ -- use tar with linux binaries or compile from source (not checked).

Install packer: https://github.com/wbthomason/packer.nvim

Setup lspconfig: https://github.com/neovim/nvim-lspconfig

run :PackerSync on changes to plugins.lua

setup https://github.com/matze/beancount-language-server

pip install neovim

Use CTRL-X-CTRL-O in insert mode.

flatpak: cannot add flathub repo on kubuntu 20.04 LTS: TLS support is not available

error: Can't load uri https://flathub.org/repo/flathub.flatpakrepo: TLS support is not available
 

Fix: need to set env. var:

 GIO_MODULE_DIR=/usr/lib/x86_64-linux-gnu/gio/modules/ flatpak -v remote-add --if-not-exists flathub
https://flathub.org/repo/flathub.flatpakrepo

XMP metadata manipulation

Add a new tag into existing subject tags in the .xmp sidecar:

exiv2 -M 'set Xmp.digiKam.TagsList my-new-tag'  mo xxx.JPG.xmp

exiv2 -M 'set Xmp.dc.subject my-new-tag'  mo xxx.JPG.xmp

 

Print specific tag:

exiv2 -g TagsList pr xxx.JPG.xmp
 

dlang vs rust comparison (based on alimg)

Comparing dmd, ldc, rust based on the same algorithm implementation:

https://github.com/exhu/alimg/tree/master/dmd

https://github.com/exhu/alimg/tree/master/bufdither-rust

rust version is the fastest (2.5 s) vs dmd's 5 secs, ldc's 2.9 s.

rust version also consumes less memory:

Maximum resident set size (kbytes): 3716

Elapsed (wall clock) time (h:mm:ss or m:ss): 0:02.50
 

DMD: 

Maximum resident set size (kbytes): 5380

Elapsed (wall clock) time (h:mm:ss or m:ss): 0:05.28

LDC: 

Elapsed (wall clock) time (h:mm:ss or m:ss): 0:02.91

Maximum resident set size (kbytes): 8044

 

The D programming language version turned out to be easy and quick to implement as it was very close to Java/C++.

The Rust version took very long time to implement, as it required considerably more time to learn Rust's basics.