serhii.net

Random / TODO / Linux

I should really rewrite my timer function to be a) Python, b) better than the current version.

# Timer in zsh
tm() {
    local DATE=$(date +'%H:%M:%S %d/%m')
    local N="$1"; shift
  (utimer -c > ~/s/sounds/outbash $N && mpg123 -q ~/s/sounds/tib.mp3  &
      zenity --info --title="Time's Up" --text="${*:-BING} \n\n $DATE")
}

utimer seeing minutes as m while everyone else (timew especially) wanting minutes as min makes me crazy.

Intellij idea

I can remove the tree of files by doubleclicking the tabs!

Intellij idea debugging paste

<Ctrl-Shift-V> gives a nice choice of things to paste, first thing being the current content of the buffer. The others I assume are historical.

Quotes in german / Random / Interesting / TODO

punctuation - What is the correct way to denote a quotation in German? - German Language Stack Exchange TODO read

Intellij idea almost-tree tabs

In Tabs Config you can select a small font for them and move them to the left instead of top.

Intellij idea project dependencies / maven / magic

I had two projects, one used code from the other one. The other one is also compiled jars gotten via maven. Had an issue that it used the maven one instead of the manually imported one I wanted it to use, even though Ctrl+Click took me to the ‘right’ directory with the files I wanted it to see.

Sorted out via Project Structure -> Modules -> $modulename -> dependencies, where I deleted the maven one and pointed it to the imported folder/project

Random / quotes / coronavirus

People seem to have a naïve view of what “cured” means: someone “gets sick”, is treated, and then returns to the status quo ante. Thus there is little concern about catching the disease (or any disease) when you are not in an “at risk” group.

But hospital discharge just means the treatment you get stops being worth the time/money. Ideally you finish convalescing at home. But any consequential damage isn’t ignored, as if you just had had a dented panel replaced on your car.

Once I understood this error some of the discussion about dealing with the virus made sense.¹

Indeed.

Work / OCR

Paper about the common OCR errors, containing statistical info about them and having nice clear lists w/ probabilities.

German, English

Stachelbeere – Wikipedia ist Крыжовник. English - Gooseberry.

Libreoffice Calc

Libreoffice Calc automatically replaces “ß”<->“ss”, unless you tick “Match case”.

Intellij idea opening files in splits

You can drag and drop files to the split you want to open them into.

Magic numbers in hash functions

algorithm - Reason for 5381 number in DJB hash function? - Stack Overflow is a nice answer about why numbers may be chosen.

Random / podcasts / quotes

• MLOps. Entwurf, Entwicklung, Betrieb – INNOQ

• Unix culture values code which is useful to other programmers, while Windows culture values code which is useful to non-programmers. ¹

• Crippleware - Wikipedia means that “vital features of the program such as printing or the ability to save files are disabled until the user purchases a registration key”

English

treble - …triple.

Intellij idea search through debugger

I can search through the variables in the debugger by just typing, without any / shortcut.

Edit distance

String Similarity Algorithms Compared | by Appaloosa Store | Medium compares different edit distance algos, TODO

Random / interesting

Third-party doctrine - Wikipedia - is a United States legal doctrine that holds that people who voluntarily give information to third parties—such as banks, phone companies, internet service providers (ISPs), and e-mail servers—have “no reasonable expectation of privacy.”

Keyboard layout / compose

Changed line to setxkbmap -option -option 'grp:rctrl_toggle, compose:rwin, compose:paus' v5,ruua &, now the Pause key works as compose too. Will check whether the RWIN works back at home with the keyboard that has a RWIN. ¹

vim macro

For markdown references, updated my old @R macro to add an additional /Enter before the actual reference part, so it’s gets parsed correctly:

`let @R = ‘viw"oyi[^^[^[^[^[A]^[^[^[Go^M[^^[^[^[^[“opA]: ^[^[^[^[’et @R = ‘viw"oyi[^A]Go

For the ^M/Enter, I used the old <C-v><Enter> trick. ²

intellij toolbox app

The Toolbox app is actually not bad at all and quite easy to use and the things it installs can actually be run from CLI. It also recognized my manually downloaded intellij - which raises the question how did it do that.

EDIT Do 17 Sep 2020 07:29:48 CEST: but of course the environment variables set in ~/.zshrc are not going to be set if you launch the toobox app not via CLI. ~/idea/bin/idea.sh remains my favourite method.

maven documentation / skipping tests

Maven Surefire Plugin – Skipping Tests has nice info and its readable, and I should read through the maven documentation sometime.

To skip maven tests: mvn install -DskipTests

Qutebrowser devtools

1. Are not enabled if I don’t import the virtualenv before running qutebrowser
2. Can be happily moved to a separate window by :devtools window

taskwarrior

Added these two nice functions to zsh, for work and not-work:

tt () {task s project:w  "$*"}
th () {task s \(sprint.is:$(date +%-V) or sprint:c \) project.not:w "$*"}

Timewarrior / timew

If I track something tagged ‘daily’ it sees it as <duration> and I get syntax error.

German

Randfälle - edge cases; TODO add to anki

Random

• Quirky Escape Rooms. - EscapeVenture

• Sioux - Wikipedia:

The name is sometimes said to be derived from an Ojibwe exonym for the Sioux meaning “little snakes” (compare nadowe “big snakes”, used for the Iroquois).

Random / quotes / meditation

However, in general, when meditating, you take the mind as you find it and work from there. There’s no particular way the mind has to be. (Reddit)

Identify an unknown process in linux

Found something called “HUNT” in htop taking A LOT of my CPU. Process with randomized name - Unix & Linux Stack Exchange:

Check its process ID, and look at ls -l /proc/process_id/ to see e.g. what the executable is (the exe symlink).

exe symlink pointed to /usr/sbin/huntd, which was easy to Google, and which turned up to be one of the bsdgames I tested earlier that still had its daemon running. I’ll remember this trick.

(Why did it take so much memory is still a mystery but I’m not that interested to check).

Random / Interesting / patterns

“If it takes water lilies that double their spread every day 50 days to cover the entire lake, on what day would they cover a half of that lake?”

The answer, obviously, is day 49. More to the point, day 45 would have had only seen the lilies cover 3,125% of the lake. Day 40 would have had been 0,0976% - from that little of an amount, the lilies would proceed to take over the entire lake in 10 more days.

So, it’s the same way with this pandemic. I think there now enough of an evidence from anywhere in the world to say that absent an (effective, early) intervention to lower R0 inside the country, it takes about 3,5 months for the virus to blow up into a devastating contagion. ¹

Intellij idea environment variables

Intellij reads environment variables only at startup, and there’s no way to refresh them. Even “Restart”-ing it via the menu didn’t help, I think I need to physically restart the process.

UPD: Even restarting the process doesn’t work if I don’t (re)start zsh (and make it read the new variables in .zshrc) in the terminal where it’s running! Which actually makes sense.

Intellij idea git annotate

VCS -> Git -> Annotate is basically git blame. It shows the last person who modified each particular line and when.

Qutebrowser ‘open in private window’

:open -p {url} opens url in private window. qutebrowser --temp-basedir -s content.private_browsing true also works.

Random / Interesting / Languages

Circumfix - Wikipedia is when something gets added both to the beginning and the end of a word; same cluster as prefixes/suffixes. Examples are German “ge…t” and “най…чший” for German/Russian.

Random / IT

Diving in the current codebase I’m reading through, I realize just how awesome are tests to understand unknown code. The usual “change stuff and see what happens” is much easier if it’s all nicely insulated, with hardcoded values, and providing examples of how to use the code. I’ll remember this.

qutebrowser

To finally save my answers to the notifications, added config.load_autoconfig() to config.py as per qutebrowser/configuring.asciidoc at master · qutebrowser/qutebrowser

Java jar/fatjar shaded dependency

libraries - What is a shaded Java dependency? - Software Engineering Stack Exchange

Shading dependencies is the process of including and renaming dependencies (thus relocating the classes & rewriting affected bytecode & resources) to create a private copy that you bundle alongside your own code.

To Shade a library is to take the contents files of said library, put them in your own jar, and change their package. This is different from packaging which is simply shipping the libraries files in side your own jar without relocating them to a different package.

Recovering corrupt textfiles / strings / fc builtin shell command

How to fix and recover zsh: corrupt history file /home/…/.zsh_history error

strings .zsh_history_old > .zsh_history
fc -R .zsh_history

strings gives the strings (=printable characters) in a file;

fc

fc is freaking awesome. Linux and Unix fc command tutorial with examples | George Ornbo

Running fc opens a text editor w/ the last command, closing it runs the command you edited. On my box it opens vim. This is so going to help me with long commands oh my God. Much better than the faux-vim syntax that I have in zsh. I’ll be able to use ci) and other things I always missed.

fc -l, fc -l 100, fc -l 100 200 lists the last commands ran (or a range). fc -ln doesn’t print their numbers. -d gives timestamps, -f for full timestamp in US format, -fE for the usual one.

Intellij / Java / Maven

• $JAVA_HOME does not get necessarily set and has to be set in maven runner settings (Build/exec/dev -> build tools -> maven), or in environment variables.
• Maven goals’ order sometimes matters (who knew)

History is happening