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Kaan Genç 2020-09-28 03:47:53 -04:00
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(sift :move {#"^img/(.*)" "public/img/$1"})
(sift :to-resource #{#"^extra/(.*)"})
(sift :move {#"^extra/(.*)" "public/extra/$1"})
(garden :styles-var 'site.styles/base :output-to "public/main.css")
(garden :styles-var 'site.styles/base :output-to "main.css")
(perun/render :renderer 'site.core/page)
(perun/sitemap :filename "sitemap.xml")
(sift :move {#"^public/(.*)" "$1"})))

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---
title: Writing a Program in Bash
date: 2015-04-12
---
I don't really know why, but writing code in Bash makes me kinda anxious. It feels really old, outdated, and confusing. Why can't a function return a string? And no classes, or even data types? After getting confused, usually, I just end up switching to Python.
<!--more-->
But this time, I decided to stick with Bash. And I am surprised. It is unbelievebly good. I must say, now I understand the Unix philosophy much better. Having small programs doing one thing very good allows you to combine the power of those programs in your scripts. You think your favourite programming language has a lot of libraries? Well, bash has access to more. The entire Unix ecosystem powers bash. Converting videos, taking screenshots, sending mails, downloading and processing pages; there are already command line tools for all of that, and you have great access to all of them.
The program I've started writing is called [WoWutils](https://github.com/SeriousBug/WoWutils). And I'm still shocked at just how much functionality I have added with so little code. If you are considering writing a program in Bash too, just go through with it. It really is very powerful.

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---
title: Emacs and extensibility
date: 2015-10-06
---
Update: I've put the small Emacs tools I have written to a
[gist](https://gist.github.com/91c38ddde617b98ffbcb).
I have been using Emacs for some time, and I really love it. The
amount of power it has, and the customizability is incredible. What
other editor allow you to connect to a server over SSH and edit files,
which is what I am doing to write this post. How many editors or IDE's
have support for so many languages?
<!--more-->
One thing I didn't know in the past, however, is extensibility of
Emacs. I mean, I do use a lot of packages, but I had never written
Elisp and I didn't know how hard or easy it would be. But after
starting to learn Clojure a bit, and feeling more comfortable with
lots of parenthesis, I decided to extend Emacs a bit to make it fit
myself better.
The first thing I added is an "insert date" function. I use Emacs to
take notes during lessons -using Org-mode- and I start every note with
the date of the lesson. Sure, glancing at the date to the corner of my
screen and writing it down takes just a few seconds, but why not write
a command to do it for me? Here is what I came up with:
```commonlisp
(defun insert-current-date ()
"Insert the current date in YYYY-MM-DD format."
(interactive)
(shell-command "date +'%Y-%m-%d'" t))
```
Now that was easy and convenient. And being able to write my first
piece of Elisp so easily was really fun, so I decided to tackle
something bigger.
It is not rare that I need to compile and run a single C file. Nothing
fancy, no libraries, no makefile, just a single C file to compile and
run. I searched around the internet like "Emacs compile and run C", but
couldn't find anything. I had been doing this by opening a shell in
Emacs and compiling/running the program, but again, why not automate
it?
The code that follows is not really good. "It works" is as good as it
gets really, and actually considering that this is the first
substantial Elisp I have written, that is pretty impressive -for the
language and Emacs, which are both very helpful and powerful- I think.
```commonlisp
(require 's)
(defun compile-run-buffer ()
"Compile and run buffer."
(interactive)
(let* ((split-file-path (split-string buffer-file-name "/"))
(file-name (car (last split-file-path)))
(file-name-noext (car (split-string file-name "[.]")))
(buffer-name (concat "compile-run: " file-name-noext))
(buffer-name* (concat "*" buffer-name "*")))
(make-comint buffer-name "gcc" nil "-Wall" "-Wextra" "-o" file-name-noext file-name)
(switch-to-buffer-other-window buffer-name*)
(set-process-sentinel (get-buffer-process (current-buffer))
(apply-partially
'(lambda (prog-name proc even)
(if (s-suffix? "finished\n" even)
(progn
(insert "Compilation successful.\n\n")
(comint-exec (current-buffer) prog-name (concat "./" prog-name) nil nil))
(insert (concat "Compilation failed!\n" even))))
file-name-noext))))
```
Again, the code is not really good. I'm uploading it here right now
because I'm actually very excited that I wrote this. Just now I can
think of ways to improve this, for example moving the compiler and the
flags to variables so that they can be customized. I could also
improve the presentation, because strings printed by this function,
comint and the running programs mixes up. I'll update this blog post
if I get to updating the code.
If this is your first time hearing about Emacs, this post may look
very confusing. I don't to Emacs any justice here, so do check it out
somewhere like [Emacs rocks](http://emacsrocks.com/). On the other
hand, if you have been looking a functionality like this, hope this
helps. If you have any suggestions about the code, I'd love to hear
them, you can find my email on the "about me" page. Anyway, have a
good day!

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---
title: Taking Backups with Duplicity
date: 2015-05-16
---
I wanted to start taking backups for some time, but I haven't had the time to do any research and set everything up. After reading another [horror story that was saved by backups](https://www.reddit.com/r/linuxmasterrace/comments/35ljcq/couple_of_days_ago_i_did_rm_rf_in_my_home/), I decided to start taking some backups.
<!--more-->
After doing some research on backup options, I decided on [duplicity](http://duplicity.nongnu.org/). The backups are compressed, encrypted and incremental, both saving space and ensuring security. It supports both local and ssh files(as well as many other protocols), so it has everything I need.
I first took a backup into my external hard drive, then VPS. The main problem I encountered was that duplicity uses [paramiko](https://github.com/paramiko/paramiko) for ssh, but it wasn't able to negotiate a key exchange algorithm with my VPS. Luckily, duplicity also supports [pexpect](http://pexpect.sourceforge.net/pexpect.html), which uses OpenSSH. If you encounter the same problem, you just need to tell duplicity to use pexpect backend by prepending your url with `pexpect+`, like `pexpect+ssh://example.com`.
Duplicity doesn't seem to have any sort of configuration files of itself, so I ended up writing a small bash script to serve as a sort of configuration, and also keep me from running duplicity with wrong args. I kept forgetting to add an extra slash to `file://`, causing duplicity to backup my home directory into my home directory! :D
If anyone is interested, here's the script:
```bash
#!/bin/bash
if [[ $(id -u) != "0" ]]; then
read -p "Backup should be run as root! Continue? [y/N]" yn
case $yn in
[Yy]*) break;;
*) exit;;
esac
fi
if [[ $1 = file://* ]]; then
echo "Doing local backup."
ARGS="--no-encryption"
if [[ $1 = file:///* ]]; then
URL=$1
else
echo "Use absolute paths for backup."
exit 1
fi
elif [[ $1 = scp* ]]; then
echo "Doing SSH backup."
ARGS="--ssh-askpass"
URL="pexpect+$1"
else
echo "Unknown URL, use scp:// or file://"
exit 1
fi
if [[ -n "$1" ]]; then
duplicity $ARGS --exclude-filelist /home/kaan/.config/duplicity-files /home/kaan "$URL/backup"
else
echo "Please specify a location to backup into."
exit 1
fi
```

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---
title: Emacs as an operating system
date: 2016-04-14
modified: 2016-05-29
---
Emacs is sometimes jokingly called a good operating system with a bad
text editor. Over the last year, I found myself using more and more of
Emacs, so I decided to try out how much of an operating system it
is. Of course, operating system here is referring to the programs that
the user interacts with, although I would love to try out some sort of
Emacs-based kernel.
<!--more-->
# Emacs as a terminal emulator / multiplexer
Terminals are all about text, and Emacs is all about text as well. Not
only that, but Emacs is also very good at running other processes and
interacting with them. It is no surprise, I think, that Emacs works
well as a terminal emulator.
Emacs comes out of the box with `shell` and `term`. Both of these
commands run the shell of your choice, and give you a buffer to
interact with it. Shell gives you a more emacs-y experience, while
term overrides all default keymaps to give you a full terminal
experience.
![Emacs as a terminal emulator](/img/emacs-terminal.png)
To use emacs as a full terminal, you can bind these to a key in your
window manager. I'm using i3, and my keybinding looks like this:
```
bindsym $mod+Shift+Return exec --no-startup-id emacs --eval "(shell)"
```
You can also create a desktop file to have a symbol to run this on a
desktop environment. Try putting the following text in a file at
`~/.local/share/applications/emacs-terminal.desktop`:
```
[Desktop Entry]
Name=Emacs Terminal
GenericName=Terminal Emulator
Comment=Emacs as a terminal emulator.
Exec=emacs --eval '(shell)'
Icon=emacs
Type=Application
Terminal=false
StartupWMClass=Emacs
```
If you want to use term instead, replace `(shell)` above with `(term "/usr/bin/bash")`.
A very useful feature of terminal multiplexers is the ability to leave
the shell running, even after the terminal is closed, or the ssh
connection has dropped if you are connection over that. Emacs can also
achieve this with it's server-client mode. To use that, start emacs
with `emacs --daemon`, and then create a terminal by running
`emacsclient -c --eval '(shell)'`. Even after you close emacsclient,
since Emacs itself is still running, you can run the same command
again to get back to your shell.
One caveat is that if there is a terminal/shell already running, Emacs
will automatically open that whenever you try opening a new one. This
can be a problem if you are using Emacs in server-client mode, or want
to have multiple terminals in the same window. In that case, you can
either do `M-x rename-uniquely` to change the name of the existing
terminal, which will make Emacs create a new one next time, or you can
add that to hook in your `init.el` to always have that behaviour:
```lisp
(add-hook 'shell-mode-hook 'rename-uniquely)
(add-hook 'term-mode-hook 'rename-uniquely)
```
# Emacs as a shell
Of course, it is not enough that Emacs works as a terminal
emulator. Why not use Emacs as a shell directly, instead of bash/zsh?
Emacs has you covered for that too. You can use eshell, which is a
shell implementation, completely written in Emacs Lisp. All you need
to do is press `M-x eshell`.
![Eshell, Emacs shell](/img/eshell.png)
The upside is that eshell can evaluate and expand lisp expressions, as
well as redirecting the output to Emacs buffers. The downside is
however, eshell is not feature complete. It lacks some features such
as input redirection, and the documentation notes that it is
inefficient at piping output between programs.
If you want to use eshell instead of shell or term, you can replace
`shell` in the examples of terminal emulator section with `eshell`.
# Emacs as a mail cilent
[Zawinski's Law](http://www.catb.org/~esr/jargon/html/Z/Zawinskis-Law.html):
Every program attempts to expand until it can read mail. Of course, it
would be disappointing for Emacs to not handle mail as well.
Emacs already ships with some mail capability. To get a full
experience however, I'd recommend using
[mu4e](http://www.djcbsoftware.nl/code/mu/mu4e.html) (mu for emacs). I
have personally set up [OfflineIMAP](http://www.offlineimap.org/) to
retrieve my emails, and mu4e gives me a nice interface on top of that.
![mu4e, mail client](/img/mu4e.png)
I'm not going to talk about the configurations of these programs, I'd
recommend checking out their documentations. Before ending this
section, I also want to mention
[mu4e-alert](https://github.com/iqbalansari/mu4e-alert) though.
# Emacs as a feed reader (RSS/Atom)
Emacs handles feeds very well too. The packages I'm using here are
[Elfeed](https://github.com/skeeto/elfeed) and
[Elfeed goodies](https://github.com/algernon/elfeed-goodies). Emacs
can even show images in the feeds, so it covers everything I need from
a feed reader.
![Elfeed, feed reader](/img/elfeed.png)
# Emacs as a file manager
Why use a different program to manage your files when you can use
Emacs? Emacs ships with dired, as well as image-dired. This gives you
a file browser, with optional image thumbnail support.
# Emacs as a document viewer
Want to read a pdf? Need a program to do a presentation? Again, Emacs.
![Docview, document viewer](/img/docview.png)
Emacs comes with
[DocView](https://www.gnu.org/software/emacs/manual/html_node/emacs/Document-View.html)
which has support for PDF, OpenDocument and Microsoft Office files. It
works surprisingly well.
Also, [PDF Tools](https://github.com/politza/pdf-tools) brings even
more PDF viewing capabilities to Emacs, including annotations, text
search and outline. After installing PDF Tools, Emacs has become my
primary choice for reading PDF files.
# Emacs as a browser
Emacs comes out of box with
[eww](https://www.gnu.org/software/emacs/manual/html_node/eww/index.html#Top),
a text-based web browser with support for images as well.
![eww, browser](/img/eww.png)
Honestly, I don't think I'll be using Emacs to browse the web. But
still, it is nice that the functionality is there.
# Emacs as a music player
Emacs can also act as a music player thanks to
[EMMS](https://www.gnu.org/software/emms/), Emacs MultiMedia
System. If you are wondering, it doesn't play the music by itself but
instead uses other players like vlc or mpd.
It has support for playlists, and can show thumbnails as well. For the
music types, it supports whatever the players it uses support, which
means that you can basically use file type.
# Emacs as a IRC client
I don't use IRC a lot, but Emacs comes out of the box with support for
that as well thanks to
[ERC](https://www.emacswiki.org/emacs?action=browse;oldid=EmacsIrcClient;id=ERC).
![erc, Emacs IRC client](/img/erc.png)
# Emacs as a text editor
Finally, Emacs also can work well as a text editor.
Emacs is a pretty fine text editor out of the box, but I want to
mention some packages here.
First,
[multiple cursors](https://github.com/magnars/multiple-cursors.el). Multiple
cursors mode allows you to edit text at multiple places at the same
time.
I also want to mention
[undo-tree](http://www.dr-qubit.org/emacs.php#undo-tree). It acts like
a mini revision control system, allowing you to undo and redo without
ever losing any text.
Another great mode is
[iy-go-to-char](https://github.com/doitian/iy-go-to-char). It allows
you to quickly jump around by going to next/previous occurrances of a
character. It is very useful when you are trying to move around a
line.
[Ace Jump Mode](https://github.com/winterTTr/ace-jump-mode/) allows
you to jump around the visible buffers. It can jump around based on
initial characters of words, or jump to specific lines. It can also
jump from one buffer to another, which is very useful when you have
several buffers open in your screen.
![Ace Jump Mode](/img/ace-jump-mode.png)
Finally, I want to mention [ag.el](https://github.com/Wilfred/ag.el),
which is an Emacs frontend for the silver searcher. If you don't know
about ag, it is a replacement for grep that recursively searches
directories, and has some special handling for projects, and is very
fast.
# Emacs as an IDE
People sometimes compare Emacs to IDE's and complain that a text
editor such as Emacs doesn't have enough features. What they are
forgetting, of course, is that Emacs is an operating system, and we
can have an IDE in it as well.
There are different packages for every language, so I'll be only
speaking on language agnostic ones.
For interacting with git, [magit](http://magit.vc/) is a wonderful
interface.
![Magit, Git Porcelain](/img/magit.png)
For auto-completion, [Company mode](https://company-mode.github.io/)
works wonders. I rely heavily on completion while writing code, and
company mode has support for anything I tried writing.
If you like having your code checked as you type,
[flycheck](https://www.flycheck.org/) has you covered. It has support
for many tools and languages.
![Company Mode and Flycheck](/img/company-flycheck.png)

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@ -76,5 +76,5 @@ above the university mean for classes of similar size.
![A picture from a 3-D video game, showing a river flowing into the sea. The text "The Land Itself" is overlayed on the sea.](/img/game-cover.jpg)\
</a>
On my free time, I develop small indie video games and release them open source.
In my free time, I develop small indie video games and release them open source.
</div>

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---
title: Motion Interpolation, 24 FPS to 60 FPS with mpv, VapourSynth and MVTools
date: 2015-07-18
modified: 2015-07-20
---
Watching videos at 60 FPS is great. It makes the video significantly smoother and much more enjoyable. Sadly, lots of movies and TV shows are still at 24 FPS. However, I recently discovered that it is actually possible to interpolate the extra frames by using motion interpolation, and convert a video from 24 FPS to 60 FPS in real time. While it is far from perfect, I think the visual artifacts are a reasonable tradeoff for high framerate.
<!--more-->
Firstly, what we need is mpv with VapourSynth enabled, and MVTools plugin for VapourSynth. VapourSynth must be enabled while compiling mpv. I adopted an AUR package [mpv-vapoursynth](https://aur4.archlinux.org/packages/mpv-vapoursynth/) which you can use if you are on Arch. Otherwise, all you need to do is use `--enable-vapoursynth` flag when doing `./waf --configure`. They explain the compilation on their [repository](https://github.com/mpv-player/mpv), so look into there if you are compiling yourself.
After that, we need MVTools plugin for VapourSynth. This is available on Arch via [vapoursynth-plugin-mvtools](https://www.archlinux.org/packages/community/x86_64/vapoursynth-plugin-mvtools/), otherwise you can find their repository [here](https://github.com/dubhater/vapoursynth-mvtools). There is also a [PPA for Ubuntu](https://launchpad.net/~djcj/+archive/ubuntu/vapoursynth) where you can find `vapoursynth-extra-plugins`, but I haven't used it myself so I can't comment on it.
After both of these are enabled, we need a script to use MVTools from VapourSynth. There is one written by Niklas Haas, which you can find here as [mvtools.vpy](https://github.com/haasn/gentoo-conf/blob/master/home/nand/.mpv/filters/mvtools.vpy). Personally, I tweaked the block sizes and precision to my liking, as well as removing the resolution limit he added. I'll put the modified version here:
```python
# vim: set ft=python:
import vapoursynth as vs
core = vs.get_core()
clip = video_in
dst_fps = display_fps
# Interpolating to fps higher than 60 is too CPU-expensive, smoothmotion can handle the rest.
while (dst_fps > 60):
dst_fps /= 2
# Skip interpolation for 60 Hz content
if not (container_fps > 59):
src_fps_num = int(container_fps * 1e8)
src_fps_den = int(1e8)
dst_fps_num = int(dst_fps * 1e4)
dst_fps_den = int(1e4)
# Needed because clip FPS is missing
clip = core.std.AssumeFPS(clip, fpsnum = src_fps_num, fpsden = src_fps_den)
print("Reflowing from ",src_fps_num/src_fps_den," fps to ",dst_fps_num/dst_fps_den," fps.")
sup = core.mv.Super(clip, pel=1, hpad=8, vpad=8)
bvec = core.mv.Analyse(sup, blksize=8, isb=True , chroma=True, search=3, searchparam=1)
fvec = core.mv.Analyse(sup, blksize=8, isb=False, chroma=True, search=3, searchparam=1)
clip = core.mv.BlockFPS(clip, sup, bvec, fvec, num=dst_fps_num, den=dst_fps_den, mode=3, thscd2=12)
clip.set_output()
```
At this point, you should be able to try this out as suggested in the script. To set this up more permanently, I'd suggest placing this script as `~/.config/mpv/mvtools.vpy`, and also writing the following as `~/.config/mpv/mpv.conf`:
```
hwdec=no
vf=vapoursynth=~/.config/mpv/mvtools.vpy
```
Now, whenever you open mpv, it will always use motion interpolation.
The result is fairly good. I noticed some significant artifacts while watching anime, but it works well with movies. I'm guessing that it is harder to track the motion in animations since they are generally exaggerated.
One thing to keep in mind, however, is performance. With `rel=2`, viewing a 1080p video results in around 90% CPU usage across all cores and 1.6 GBs of ram on my Intel i7 4700MQ. With `rel=1`, CPU usage goes down to about 60% per core. This process is very heavy on the processor, and you may have trouble unless you have a fast CPU.

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---
title: Switching to pass
date: 2015-03-30
---
For some time, I used LastPass to store my passwords. While LastPass works well, it doesn't fit into the keyboard driven setup I have. I have been looking into alternatives for some time, I looked into KeePassX but just like LastPass, it doesn't give me any ways to set up keyboard shortcuts. On the other hand, and I recently came across [pass](http://www.passwordstore.org/), and it provides everything I want.
<!--more-->
Pass uses GPG keys to encrypt the passwords, and git to keep revisions and backups. It integrates well with the shell, and there is a dmenu script, a Firefox plugin and an Android app. All the passwords are just GPG enrypted files, stored in some folders anyway, so you don't need anything special to work with them.
![passmenu, the dmenu pass script](/static/passmenu.png)
So first, I needed to migrate my passwords from LastPass to pass. The website lists some scripts for migration, but sadly I missed that when I first looked at the page. So I decided to write a [python script to handle the migration](https://gist.github.com/SeriousBug/e9f33873d10ad944cbe6) myself. It inserts all passwords in `domain/username` format, and if there is any extra data written, it is added after the password as well. Secure notes are placed into their own folder, and any "Generated Password for ..." entries are skipped. If you're migrating from LastPass to pass, feel free to give it a try. If you are taking an export from their website however, do make sure that there is no whitespace before and after the csv.
![Password Store, the pass Android app](/static/password_store.png)
I certainly recommend trying out pass. It works very well, and it fits in with the unix philosophy.

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@ -1,9 +1,11 @@
(ns site.core
(:require [hiccup.page :as hp]
[garden.core :as gc]))
(:require [hiccup.page :as hp]))
(defn page [data]
(defn format-time [time] (.format (-> time .toInstant (.atZone (java.time.ZoneId/systemDefault)) .toLocalDate) (java.time.format.DateTimeFormatter/ofPattern "MMM d, yyyy")))
(defn page [{global-meta :meta posts :entries post :entry}]
(hp/html5
[:head
[:meta {:charset "utf-8"}]
@ -12,7 +14,6 @@
[:link {:href
"https://fonts.googleapis.com/css2?family=Ubuntu:ital,wght@0,400;0,700;1,400;1,700&display=swap"
:rel "stylesheet"}]
(when (= "index" (-> data :entry :slug))
[:div.sidebar.column
[:img.picture {:alt "A photo of Kaan Genç, after his OOPSLA 2019 talk." :src "/img/profile.jpg"}]
[:div.name "Kaan Genç"]
@ -21,7 +22,15 @@
[:div.affiliation "The Ohio State University"]
[:span [:a.email {:href "mailto:genc.5@osu.edu"} "genc.5@osu.edu"] [:a.gpg {:href "/extra/kaangenc.gpg"} "GPG key"]]
[:a.github {:href "https://github.com/SeriousBug"} "Github"]
[:a.github {:href "https://twitter.com/KaanGencCS"} "Twitter"]
[:a.researchr {:href "https://conf.researchr.org/profile/kaangenc"} "Researchr"]
[:a.cv {:href "/extra/cv.pdf"} "CV"]])
[:a.cv {:href "/extra/cv.pdf"} "CV"]]
(if (= "index" (:slug post))
;; Index page
[:div.main.column (:content post)]
;; Blog post
[:div.main.column
(-> data :entry :content)]))
[:h1.post-title (:title post)]
[:div.date "Written at " (-> post :date format-time)]
(when (:modified post) [:div.modified "Last edited at " (-> post :modified format-time)])
(:content post)])))

View file

@ -11,7 +11,7 @@
["h1:not(:first-child)" {:margin-top "2em"}]
[:h2 {:font-size "1.3em"}]
[:h3 {:font-size "1.15em"}]
["img, .img" {:border-radius "5px"}]
["img, .img" {:border-radius "5px" :max-width "100%"}]
[:.sidebar
{:max-width "300px"}
[">a,span" {:display "block" :padding "10px 0"}]