config.phundrak.com/docs/scripts.org

#+TITLE: Custom Scripts
#+setupfile: headers
#+PROPERTY: header-args :exports code
#+PROPERTY: header-args:emacs-lisp :exports none :tangle no

* Custom Scripts
This file will present all the executable scripts I wrote. It is also their
original source code, all the following code snippets are exported and tangled
from this file to the actual executables.

** Autostart
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env bash" :mkdirp yes :tangle ~/.local/bin/autostart
:END:
Because I sometimes switch from window manager to window manager, creating a
script that handles by itself autostarting things for me is way easier than
rewriting every time the autostart part of my configuration. As you can every
instance will be launched asynchronously, and only if there is no other instance
of said command running.
#+NAME: autostart-table
| Command              | Arguments                                | Run once? |
|----------------------+------------------------------------------+-----------|
| ~pactl~                | ~load-module module-switch-on-connect~     |           |
| ~mpc~                  | ~stop~                                     | no        |
| ~xrdb~                 | ~-merge "$XDG_CONFIG_HOME"/X11/Xresources~ | no        |
| ~picom~                |                                          | yes       |
| ~numlockx~             | ~on~                                       | yes       |
| ~xfce-polkit~          |                                          | yes       |
| ~nm-applet~            |                                          | yes       |
| ~xwallpaper~           | ~--zoom "$(cat "$HOME"/.cache/wallpaper)"~ | no        |
| ~xss-lock~             | ~plock~                                    | yes       |
| ~/usr/lib/kdeconnectd~ |                                          | yes       |
| ~dunst~                |                                          | yes       |

#+NAME: autostart-gen
#+header: :wrap "src bash :exports code"
#+BEGIN_SRC emacs-lisp :var table=autostart-table :cache yes
(mapconcat (lambda (start-command)
             (let* ((clean-string (lambda (str) (replace-regexp-in-string "~" "" str)))
                    (command      (funcall clean-string (nth 0 start-command)))
                    (arguments    (funcall clean-string (nth 1 start-command)))
                    (oncep        (string= "yes" (nth 2 start-command)))
                    (full-command (replace-regexp-in-string
                                   " +"
                                   " "
                                   (format "%s %s &" command arguments))))

               (concat (format "which %s && %s"
                               command
                               (if (not oncep)
                                   full-command
                                 (format (concat "if pgrep -x %s ; then\n"
                                                 "    echo %s already running\n"
                                                 "else\n"
                                                 "    %s\n"
                                                 "    disown\n"
                                                 "fi")
                                         command
                                         command
                                         full-command))))))
           table
           "\n")
#+END_SRC

#+RESULTS[8c42a43989020c61050b2930ae60c81248c2dd44]: autostart-gen
#+begin_src bash :exports code
which pactl && pactl load-module module-switch-on-connect &
which mpc && mpc stop &
which xrdb && xrdb -merge "$XDG_CONFIG_HOME"/X11/Xresources &
which picom && if pgrep -x picom ; then
    echo picom already running
else
    picom &
    disown
fi
which numlockx && if pgrep -x numlockx ; then
    echo numlockx already running
else
    numlockx on &
    disown
fi
which xfce-polkit && if pgrep -x xfce-polkit ; then
    echo xfce-polkit already running
else
    xfce-polkit &
    disown
fi
which nm-applet && if pgrep -x nm-applet ; then
    echo nm-applet already running
else
    nm-applet &
    disown
fi
which xwallpaper && xwallpaper --zoom "$(cat "$HOME"/.cache/wallpaper)" &
which xss-lock && if pgrep -x xss-lock ; then
    echo xss-lock already running
else
    xss-lock plock &
    disown
fi
which /usr/lib/kdeconnectd && if pgrep -x /usr/lib/kdeconnectd ; then
    echo /usr/lib/kdeconnectd already running
else
    /usr/lib/kdeconnectd &
    disown
fi
which dunst && if pgrep -x dunst ; then
    echo dunst already running
else
    dunst &
    disown
fi
#+end_src

I also have an external sound card, a Scarlet 2i2 G3, that I would
like to use as my default audio output. However, it might not be
always connected, hence the following code:
#+NAME: default-soundcard
#+BEGIN_SRC bash
SOUNDCARD=$(pactl list short sinks | grep "Focusrite")
if [[ -n $SOUNDCARD ]]; then
    pactl set-default-sink "$(echo "$SOUNDCARD" | awk '{print $2}')"
fi
#+END_SRC

** cli utilities
*** Backup
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/backup
:END:
~backup~ is a very simple, one-liner script that will create a local
copy of a file and add the date at which it was copied in the
filename. You can see its source code here:
#+BEGIN_SRC sh
cp -r "$1" "$1.bak.$(date +%Y%m%d%H%M%S)"
#+END_SRC

*** CPU Scaling
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env bash" :mkdirp yes :tangle ~/.local/bin/cpu-scaling
:END:
As I am using a laptop, maximum performance isn’t always what I want.
Sometimes, it’s just better to have not so great but less
battery-demanding performance. It is possible to achieve this by
modifying the CPU governor with ~cpupower~. The [[https://wiki.archlinux.org/title/CPU_frequency_scaling#Scaling_governors][Arch Wiki]] has, as usual,
some superb documentation on this.

The following script asks the user through ~rofi~ which governor to
apply, and it relies on [[file:./scripts.md#askpass][askpass]] to retrieve the user’s password.
#+begin_src bash
governors=("performance" "powersave" "userspace" "ondemand" "conservative" "schedutil")
governor=$(printf "%s\n" "${governors[@]}" | rofi -dmenu)
sudo -A cpupower frequency-set -g "$governor"
#+end_src

*** docker-running
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :tangle ~/.local/bin/docker-running
:END:
As with =mu-unread= below, =docker-running= is a small and simple utility
for my StumpWM configuration which indicates how many Docker
containers are currently running.

#+begin_src sh
NB_CONTAINERS=$(docker ps -q | wc -l | tr -d '\n')
printf "^f3^f0 %d" $NB_CONTAINERS
#+end_src

*** Kamoji Generator
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :tangle ~/.local/bin/kamoji
:END:
This script comes straight from [[https://charm.sh/blog/kamoji-generator/][this blog post]] and generates kamoji. I
modified it a bit in order to work with either =xclipboard= or =wl-copy=
depending on whether I am in an X.org session or a Wayland session.

Note that it requires the =OPENAI_API_KEY= environment variable to be
set with a valid OpenAI key.
#+begin_src bash
# If the user passes '-h', '--help', or 'help' print out a little bit
# of help. text.
case "$1" in
    "-h" | "--help" | "help")
        printf 'Generate kaomojis on request.\n\n'
        printf 'Usage: %s [kind]\n' "$(basename "$0")"
        exit 1
        ;;
esac

# The user can pass an argument like "bear" or "angry" to specify the
# general kind of Kaomoji produced.
sentiment=""
if [[ $1 != "" ]]; then
    sentiment=" $1"
fi

# Ask mods to generate Kaomojis. Save the output in a variable.
kaomoji="$(mods "generate 10${sentiment} kaomojis. Number them and put each one on its own line.")"
if [[ $kaomoji == "" ]]; then
    exit 1
fi

# Pipe mods output to gum, so the user can choose the perfect kaomoji.
# Save that choice in a variable. Also note that we're using cut to
# drop the item number in front of the Kaomoji.
choice="$(echo "$kaomoji" | gum choose | cut -d ' ' -f 2)"
if [[ $choice == "" ]]; then
    exit 1
fi

# If the current session is Wayland, copy with wl-copy, otherwise copy
# with xclipboard
if [ "$XDG_SESSION_TYPE" = "wayland" ]
then printf '%s' "$choice" | wl-copy # Wayland
else printf '%s' "$choice" | xclip -sel clip # X11
fi

# We're done!
printf 'Copied %s to the clipboard\n' "$choice"
#+end_src

*** mu-unread
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :tangle ~/.local/bin/mu-unread
:END:
~mu-unread~ is a very simple utility that simply returns the amount of
unread emails I have through the use of ~mu~.

As you can see, the output string contains two font switchers for
StumpWM so I can switch from the main font to Siji for the character
contained between them: U+E072 (an email icon).
#+begin_src sh
UNREAD=$(mu find "flag:unread AND (maildir:/Inbox OR maildir:/Junk)" | wc -l)
printf "^f2^f0%s" "$UNREAD"
#+end_src

*** screenshot
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/screenshot
:END:
This is a utility only useful with Wayland for now, using =grim=, =slurp=
(in order to select which area of the screen I wish to capture) and
=wl-copy= (from =wl-clipboard=). It saves the screenshot in my
=$HOME/Pictures/Screenshots= directory with a name formatted as
=Screenshot_20230425_134550.png= if the screenshot was taken on the 25th
of April 2023 at 1:45:50PM. If the file already exists, the script
will suffix the name with an underscore followed by an incremental
number like =Screenshot_20230425_134550_1.png= or
=Screenshot_20230425_134550_2.png=.

If the argument =select= is passed to =screenshot=, as in =screenshot
select=, then use =slurp= to select the area to capture.
#+begin_src sh
OUTFILE_BASE="$HOME/Pictures/Screenshots/Screenshot_$(date +%Y%m%d)_$(date +%H%M%S)"
OUTFILE="$OUTFILE_BASE.png"
SUFFIX=0

while getopts ':cd:egs' OPTION; do
    case "$OPTION" in
        c )
            COPY="yes"
            ;;
        d )
            DELAY="$OPTARG"
            ;;
        e )
            EDIT="yes"
            ;;
        g )
            GIMP="yes"
            ;;
        s )
            SELECT="yes"
            ;;
        ? )
            echo "Usage: $(basename "$0") [-c] [-d DELAY] [-e] [-g] [-s]"
            exit 1
            ;;
    esac
done

if [ "$SELECT" = "yes" ]
then AREA="$(slurp)"
fi

if [ -n "$DELAY" ]
then sleep "$DELAY"
fi

if [ "$SELECT" = "yes" ]
then grim -g "$AREA" "$OUTFILE"
else grim "$OUTFILE"
fi

if [ "$EDIT" = "yes" ]
then swappy -f "$OUTFILE" -o "$OUTFILE"
fi

if [ "$GIMP" = "yes" ]
then gimp "$OUTFILE"
fi

if [ "$COPY" = "yes" ]
then wl-copy < "$OUTFILE"
fi

# wl-copy < "$OUTFILE"
#+end_src

*** sshbind
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/sshbind
:END:
Something that I did not know for quite some time, but that is
actually crazy useful about SSH is its ability to bind locally the
port of a remote machine, and vice versa. The syntax is actually very
simple, but I prefer a more intuitive way of writing it. Its usage is
~sshbind PORT FROMHOST TOHOST~.
#+BEGIN_SRC sh
ssh -L "$1:$3:$1" "$2" -N
#+END_SRC

*** Nsxiv key handler
:PROPERTIES:
:HEADER-ARGS: :mkdirp yes :tangle no :noweb yes
:END:
One thing I like with ~nsxiv~ is you can trigger different behaviours
based on keypresses. For instance, with my current nsxiv
configuration, if I press the space key followed by a character, it
can delete to the trashcan, delete definitively, or open the current
image in GIMP. All of that is done through one script file stored in
~$HOME/.config/nsxiv/exec/key-handler~. The fact it reacts to first
thespace bar instead of /Ctrl-x/ is because I use a custom version of
nsxiv I first modified to fit the bépo layout, and then I decided to
change the prefix to fit how I use Emacs and StumpWM. You can read the
PKGBUILD and my nsxiv patch [[https://labs.phundrak.com/phundrak/dotfiles/src/branch/master/Documents/code/PKGBUILDs/sxiv][in my dotfiles repo]].

#+header: :shebang "#!/usr/bin/env fish" :tangle ~/.config/nsxiv/exec/key-handler
#+begin_src fish
<<nsxiv-read-files>>

<<nsxiv-switch-statement>>
#+end_src

Here is a step by step explanation of the source code. First, we want
to store in the variable ~FILES~ all the files marked in nsxiv. This is
done with a ~while~ loop and the ~read~ command.
#+name: nsxiv-read-files
#+begin_src fish
while read file
    set -g FILES "$file" $FILES
end
#+end_src

We can then read from the first member of ~argv~ which key the user
pressed. Depending on it, we can choose what to execute.
#+name: nsxiv-switch-statement
#+begin_src fish
switch "$argv[1]"
    <<nsxiv-trash>>
    <<nsxiv-rm>>
    <<nsxiv-gimp>>
    <<nsxiv-jpeg>>
    <<nsxiv-rotate-clockwise>>
    <<nsxiv-rotate-counter-clockwise>>
    <<nsxiv-yank>>
end
#+end_src

The first option with the letter ~d~ is to move the file to the trash
can. For this, we use the ~trash~ command from ~trash-cli~.
#+name: nsxiv-trash
#+begin_src fish
case "d"
    trash $FILES
#+end_src

In case we want to definitively delete a file without using the trash
can, we can use ~rm~ instead when we press the ~D~ key.
#+name: nsxiv-rm
#+begin_src fish
case "D"
    rm $FILES
#+end_src

It’s not rare I want to modify an image I have open in nsxiv,
especially since screenshots are automatically open in this image
viewer aften they are taken. In that case, a simple command will do.
#+name: nsxiv-gimp
#+begin_src fish
case "g"
    gimp $FILES
#+end_src

Often, I use nsxiv to convert an image to a JPEG file, because my
internet connection is not that great and JPEG screenshots are faster
to upload than PNG screenshots. So what I do is for each file
selected, I take the base name of the file (i.e. remove its
extension), and then I use the ~convert~ command from ~imagemagik~ to
convert it from its original format to a JPG format --- ~imagemagik~
detects the formats based on the extension.
#+name: nsxiv-jpeg
#+begin_src fish
case "j"
    for f in $FILES
        set basename (echo "$f" | sed 's/\.[^.]*$//')
        convert "$f" "$basename.jpg"
    end
#+end_src

I have two commands to rotate my files, and both only differ by the
angle of rotation. Once again I rely on ~convert~ in both cases. To
rotate clockwise, this is the code needed.
#+name: nsxiv-rotate-clockwise
#+begin_src fish
case "r"
    for f in $FILES
        convert -rotate 90 "$f" "$f"
    end
#+end_src

On the other hand, to rotate counter-clockwise, we need this code:
#+name: nsxiv-rotate-counter-clockwise
#+begin_src fish
case "R"
    for f in $FILES
        convert -rotate 270 "$f" "$f"
    end
#+end_src

Lastly, when I want to copy a file, I just hit the ~y~ key for “yank”
(that’s a term from Emacs). For that, I rely on ~file~ to tell me the
mimetype of the image, then I can pass it to ~xclip~ along with the
filename to copy it to the clipboard. In this case, we only copy the
first of the selected files since the clipboard cannot hold several
files at once.
#+name: nsxiv-yank
#+begin_src fish
case "y"
    set FILE "$FILES[1]"
    set TYPE (file -i "$FILE" | sed -r 's|.*(image/[a-z]+);.*|\1|')
    xclip -sel clip -t "$TYPE" -i "$FILE"
#+end_src

*** Secure key generator
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :tangle ~/.local/bin/skg
:END:
#+begin_src bash
tr -cd '[:alnum:]' < /dev/urandom | fold -w 64 | head -n 1 | tr -d '\n'
#+end_src

*** Starwars
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/starwars
:END:
This is a one-liner that allows you to watch Star Wars episode 4 in ASCII art in
your terminal. Here is the code:
#+BEGIN_SRC sh
telnet towel.blinkenlights.nl
#+END_SRC

** Emacs stuff
*** Dired
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/bin/bash" :mkdirp yes :tangle ~/.local/bin/dired
:END:
This script allows me to open anything in dired from the command line.
#+BEGIN_SRC bash
emacsclient -c -a emacs -e "(dired \"$*\")"
#+END_SRC

*** Ediff
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/bin/bash" :mkdirp yes :tangle ~/.local/bin/ediff
:END:
I want Ediff as my merge tool, not just with Git but with other
programs tooa, such as =pacdiff=.
#+begin_src bash
emacsclient -c -a emacs -e "(ediff-files \"$1\" \"$2\")"
#+end_src

*** Emacsmail
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/bin/bash" :mkdirp yes :tangle ~/.local/bin/emacsmail
:END:
This short script is used in my =~/.local/share/applications/mu4e.desktop= file
in order to send to Emacs any ~mailto:~ requests made in my system.
#+BEGIN_SRC bash
emacsclient -c -n -a emacs -e "(browse-url-mail \"$*\")"
#+END_SRC

*** Restart Emacs
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/bin/bash" :mkdirp yes :tangle ~/.local/bin/restart-emacs
:END:
Believe me or not, it happens I restart Emacs. I generally start Emacs
manually with =emacs --daemon= because of an issue rendering =lsp-mode=
useless when started by the user systemd service.
#+begin_src bash
PID_EMACS=$(pidof emacs)
killall emacs
echo "Waiting for Emacs to be killed... (pid: $PID_EMACS)"
if timeout 30 tail --pid=$PID_EMACS -f /dev/null ; then
    emacs --daemon
else
    echo "Failed to kill Emacs after 30s"
fi
#+end_src

** Media
*** mp42webm
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/mp42webm
:END:
This function allows me to convert easily a MP4 video to the webm
format. Nothing too fancy here.
#+BEGIN_SRC sh
ffmpeg -i "$1" -c:v libvpx -crf 10 -b:v 1M -c:a libvorbis "$1".webm
#+END_SRC

*** youtube-dl wrappers
**** ytplay
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env bash" :mkdirp yes :tangle ~/.local/bin/ytplay
:END:
~ytplay~ is a simple script I’ve written that allows me to play in MPV
any YouTube video at the desired resolution. The script relies on
~dmenu~ (or ~rofi~ in dmenu-mode), ~youtube-dl~ and of course ~mpv~ itself.
#+BEGIN_SRC bash
URL=$(rofi -dmenu -i -p "Video URL")
if [ -z "$URL" ]; then
    echo "You need to provide a URL"
    exit 1
fi
RESOLUTION_CHOICE=$(yt-dlp --list-formats "$URL" | \
                        grep -E "webm.*[0-9]+x[0-9]" | \
                        awk '{print $3 " " $1}' | \
                        sort -gu | \
                        rofi -dmenu -i -p "Resolution")
mapfile -t RESOLUTION <<< "$RESOLUTION_CHOICE"
RESOLUTION_CODE=${RESOLUTION[0]}
mpv --ytdl-format="${RESOLUTION_CODE}+bestaudio/best" "$URL"
#+END_SRC

I’ll even add a ~.desktop~ entry for this script:
#+BEGIN_SRC conf-desktop :tangle ~/.local/share/applications/ytplay.desktop :mkdirp yes
[Desktop Entry]
Type=Application
Version=1.0
Name=ytplay (YouTube in mpv)
Comment=Play YouTube videos in mpv
Exec=/home/phundrak/.local/bin/ytplay
Path=/home/phundrak/.local/bin
Terminal=false
Categories=Media
#+END_SRC

** Misc
*** Broadway
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/broadway
:END:
This simple script launches broadwayd, a utility that renders GTK
applications as web apps, and a program displayed to broadway
directly.
#+begin_src sh
export display_screen=:5
broadwayd $display_screen &
GDK_BACKEND=broadway BROADWAY_DISPLAY=$display_screen "$@"
#+end_src

But let’s cut the middleman for most of my uses of Broadway.
#+begin_src sh :tangle ~/.local/bin/emacs-web
export display_screen=:5
broadwayd $display_screen &
GDK_BACKEND=broadway BROADWAY_DISPLAY=$display_screen emacs
#+end_src

** Plock
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/plock
:END:
~plock~ is a simple script that locks the screen with ~i3lock~ while setting as
the background image of the locked screen a corrupted screenshot of the screen
before it was locked.
#+BEGIN_SRC sh
TMPBG="/tmp/screen.png"
if [ "$XDG_SESSION_TYPE" = "wayland" ]
then
    SCREENER=grim
    LOCKER="swaylock -feF"
else
    SCREENER=scrot
    LOCKER="i3lock -ef"
fi

$SCREENER "$TMPBG"
corrupter -add 0 "$TMPBG" "$TMPBG"
$LOCKER -ti "$TMPBG"
rm $TMPBG
#+END_SRC

** Polybar-launch (Deprecated)                                       :noexport:
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env bash" :mkdirp yes :tangle ~/.local/bin/polybar-launch
:END:
This scripts allows the user to kill polybar and relaunch it, or to simply
launch it if polybar isn’t launched yet. First thing to do is kill all polybar
processes.
#+BEGIN_SRC bash
killall -q polybar
#+END_SRC

Now we have to wait untill all polybar processes have been shut down.
#+BEGIN_SRC bash
while pgrep -u $UID -x polybar >/dev/null; do sleep 1; done
#+END_SRC

Now that our system isn’t running polybar anymore, we’ll launch it again on all
of our screens. By the way, I have two bars, so I’ll have to lauch them both.
#+BEGIN_SRC bash
if type "xrandr"; then
    for m in $(xrandr --query | grep " connected" | cut -d" " -f1); do
        MONITOR=$m polybar --reload top &
        MONITOR=$m polybar --reload bottom &
    done
else
    polybar --reload top &
    polybar --reload bottom &
fi
#+END_SRC

And we’re done! Let’s just launch a notification polybar has been relaunched.
#+BEGIN_SRC bash
notify-send "Polybar restarted!" -a "polybar-launch"
#+END_SRC

** Rofi utilities
*** askpass
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/askpass
:END:
Askpass is a simple script that invokes ~rofi~ as a way to get from a GUI the
user’s sudo password. It is inspired by [[https://github.com/ODEX-TOS/tools/blob/master/rofi/askpass][this original tool]], rewritten in bash
and with [[https://wiki.archlinux.org/index.php/Rofi][rofi]] support instead of [[https://wiki.archlinux.org/index.php/Dmenu][dmenu]]. As you can see, this is a oneliner if we
ignore the initial shebang. This executable is pointed at by the
#+BEGIN_SRC sh
rofi -dmenu -password -no-fixed-num-lines -p $(printf "$*" | sed 's/://')
#+END_SRC

*** awiki
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/awiki
:END:
~awiki~ is a simple script used with ~rofi~ that relies on the ~arch-wiki-docs~
package in order to provide the user a way to quickly find and display any
English page from the Arch Wiki in a browser. The advantage of using this over
the ~wiki-search~ utility from the ~arch-wiki-lite~ package is you get instant
suggestion in rofi using fuzzy-search. The downside is rofi will only help you
find pages by their title, and it will not help you find keywords in the content
of said pages.

The first step is to create the list of all the pages that are currently stored
on disk. ~arch-wiki-docs~ stores them in ~/usr/share/doc/arch-wiki/html/en~. A
simple ~ls~ piped in three ~sed~ will give us a list of page titles. We then
pipe that into rofi in dmenu mode in order to choose the page we want to
display. By the way, setting the location of the HTML files will come in handy
later.
#+BEGIN_SRC sh
WLOCATION=/usr/share/doc/arch-wiki/html/en/
WPAGE=$(/bin/ls "$WLOCATION" | \
            sed -e 's/_/ /g' -e 's/\.html$//' -e 's|.*/\(.*\)|\1|' | \
            rofi -dmenu -p "Arch Wiki" -i)
WPAGE=$(echo $WPAGE | sed -r 's/\s+/_/g')
#+END_SRC

Now, all I need to do is to send this list into rofi and tell it to open the
result with our favorite browser with ~xdg-open~.
#+BEGIN_SRC sh
xdg-open "$WLOCATION$WPAGE.html"
#+END_SRC

*** dmenu
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/dmenu
:END:
I wrote this very simple script in order to replace =dmenu= with rofi’s
emulation of dmenu, since I prefer rofi’s appearance. It basically calls rofi’s
dmenu emulation with the arguments initially passed to dmenu.
#+BEGIN_SRC sh
rofi -dmenu "$*"
#+END_SRC

*** Emoji picker
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env bash" :mkdirp yes :tangle ~/.local/bin/rofi-emoji
:END:
The emoji picker is a simple bash script that uses rofi and
[[file:~/.config/emoji.txt][~/.config/emoji.txt]] to provide a small, local search for emojis. It is
relatively easy to build this file from the Unicode’s [[https://unicode.org/Public/emoji/15.0/emoji-test.txt][test file]]. Once
the emoji is selected, it is copied to the clipboard using =xclipboard=
when in a Xorg session or =wl-copy= from =wl-clipboard= when in a Wayland
session.
#+BEGIN_SRC bash
SELECTED_EMOJI=$(grep -v "#" ~/.config/emoji.txt | rofi -dmenu -p "Select emoji" -i | awk '{print $1}' | tr -d '\n')
if [ "$XDG_SESSION_TYPE" = "wayland" ]
then printf "%s" "$SELECTED_EMOJI" | wl-copy
else printf "%s" "$SELECTED_EMOJI" | xclip -sel clip
fi
#+END_SRC

Also, let’s send a notification telling the user the emoji has been copied!
#+BEGIN_SRC bash
if [ "$XDG_SESSION_TYPE" = "wayland" ]
then EMOJI=$(wl-paste)
else EMOJI=$(xclip -o)
fi

test -z "$EMOJI" && notify-send "No emoji copied" -u low && exit
EMOJI="$EMOJI copied to clipboard"
notify-send -u low "$EMOJI"
#+END_SRC

It is inspired from [[https://www.youtube.com/watch?v=UCEXY46t3OA][this video]] from [[https://lukesmith.xyz/][Luke Smith]].

*** rofi-ytdl
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env bash" :mkdirp yes :tangle ~/.local/bin/rofi-ytdl
:END:
This is just a simple wrapper around [[file:./scripts.md#ytdl-a-youtube-dl-wrapper][ytdl]] so I can easily download a
video from rofi, which we’ll use first to retrieve the URL of the
video we want to download, be it from YouTube or other website
supported by ~youtube-dl~.
#+BEGIN_SRC bash
URL=$(echo "Video to download:" | rofi -dmenu -i -p "Video to download:")
#+END_SRC

Now, if the variable ~URL~ is not empty (i.e. the user specified a link and did
not abort the operation), we’ll proceed to the download. Before it begins, we’ll
send a notification saying the download is about to begin. When the ~ytdl~
process ends, we’ll also send a notification notifying the user on the success
or failure of the download.
#+BEGIN_SRC bash
if [ -n "$URL" ]; then
    notify-send -u normal "YTDL" "Starting downloading\n$URL"
    if [[ $(ytdl "$URL") ]]
    then
        notify-send -u normal "YTDL" "Finished downloading!"
    else
        notify-send -u critical "YTDL" "Failed downloading\n$URL"
    fi
fi
#+END_SRC

** Wallpaper utilities
*** pape-update
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/pape-update
:END:
This little tool sets a random wallpaper using xwallpaper.
#+BEGIN_SRC sh
PAPESDIR=$HOME/Pictures/Wallpapers
PAPE=$(find "$PAPESDIR" -type f | sort -R | tail -1)
set-pape "$PAPE"
#+END_SRC

*** Select wallpaper
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/select-pape
:END:
This script is based on what ~nsxiv~ can do as an image viewer as well as
xwallpaper.
#+BEGIN_SRC sh
PAPE=$(nsxiv -orbft ~/Pictures/Wallpapers/*)
set-pape "$PAPE"
#+END_SRC

*** Set a wallpaper
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env bash" :mkdirp yes :tangle ~/.local/bin/set-pape
:END:
This utility is not meant to be called by the user directly, but rather by
scripts that may be written by the user. Its role is simple: check if the
provided wallpaper exists and if it is an image. If both requirements are met,
the path to this image is then stored in ~$XDG_CACHE_HOME/wallpaper~, or if this
variable is empty in ~$HOME/.cache/wallpaper~.
#+BEGIN_SRC sh
CACHEFILE=$([ -n "$XDG_CACHE_HOME" ] && echo "$XDG_CACHE_HOME/wallpaper" || echo "$HOME/.cache/wallpaper")
[[ -f $1 ]] &&                              \
    grep image <(file -b --mime-type "$1") && \
    echo "$1" > "$CACHEFILE"                    \
    && xwallpaper --zoom "$1"
#+END_SRC

** Wayland
*** Wayland Environment Variables Setup
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/way-env-setup
:END:
#+begin_src sh
#export GDK_BACKEND=wayland # May cause problems with some xorg applications
export TDESKTOP_DISABLE_GTK_INTEGRATION=1
export CLUTTER_BACKEND=wayland
export BEMENU_BACKEND=wayland

# Firefox
export MOZ_ENABLE_WAYLAND=1

#
# Qt environment
#
export QT_QPA_PLATFORM=wayland-egl #error with apps xcb
export QT_WAYLAND_FORCE_DPI=physical
export QT_WAYLAND_DISABLE_WINDOWDECORATION=1

#
# Elementary environment
#
export ELM_DISPLAY=wl
export ECORE_EVAS_ENGINE=wayland_egl
export ELM_ENGINE=wayland_egl
export ELM_ACCEL=opengl
# export ELM_SCALE=1

#
# SDL environment
#
export SDL_VIDEODRIVER=wayland

#
# Java environment
#
export _JAVA_AWT_WM_NONREPARENTING=1

export NO_AT_BRIDGE=1
export WINIT_UNIX_BACKEND=wayland
export DBUS_SESSION_BUS_ADDRESS
export DBUS_SESSION_BUS_PID
#+end_src

*** Qtile
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/launch-qtile
:END:
#+begin_src sh
export SDL_VIDEODRIVER=wayland
export XDG_SESSION_TYPE=wayland
export XDG_SESSION_DESKTOP=wlroots
export XDG_CURRENT_TYPE=wlroots
export XDG_CURRENT_DESKTOP=wlroots
. /etc/X11/xinit/xinitrc.d/50-systemd-user.sh
. way-env-setup
systemctl --user import-environment DISPLAY WAYLAND_DISPLAY XDG_CURRENT_DESKTOP
exec qtile start -b wayland
#+end_src

*** Newm
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/launch-newm
:END:
#+begin_src sh
export SDL_VIDEODRIVER=wayland
export XDG_SESSION_TYPE=wayland
export XDG_SESSION_DESKTOP=wlroots
export XDG_CURRENT_TYPE=wlroots
export XDG_CURRENT_DESKTOP=wlroots
. /etc/X11/xinit/xinitrc.d/50-systemd-user.sh
. way-env-setup
systemctl --user import-environment DISPLAY WAYLAND_DISPLAY XDG_CURRENT_DESKTOP
exec start-newm
#+end_src

*** Sway
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/swaybar-cmd
:END:
#+begin_src sh :tangle ~/.local/bin/launch-sway
export SDL_VIDEODRIVER=wayland
# export XDG_SESSION_TYPE=wayland
# export XDG_SESSION_DESKTOP=wlroots
# export XDG_CURRENT_TYPE=wlroots
export XDG_CURRENT_DESKTOP=sway
. /etc/X11/xinit/xinitrc.d/50-systemd-user.sh
. way-env-setup
systemctl --user import-environment DISPLAY WAYLAND_DISPLAY XDG_CURRENT_DESKTOP
exec sway --unsupported-gpu
#+end_src

Below is the script I use to display information in sway’s bar. It is
divided by functions that are then called all together. First, getting
the date is quite straightforward.
#+begin_src sh
sb_date() {
    echo "$(date +'%Y-%m-%d %H:%M:%S') | "
}
#+end_src

Then we can get what piece of audio is playing. Note however that
something will be displayed only if something is playing.
#+begin_src sh
sb_playerctl() {
    PLAYING=""
    if [ "$(playerctl status)" = "Playing" ]; then
        PLAYING_ARTIST="$(playerctl metadata xesam:artist)"
        PLAYING_TITLE="$(playerctl metadata xesam:title)"
        PLAYING=" $PLAYING_ARTIST - $PLAYING_TITLE | "
    fi
    echo "$PLAYING"
}
#+end_src

The battery is relatively straightforward too. I should however find
how to get estimates of battery time. I’m sure I can come up with
something, but for now I’m just too lazy.
#+begin_src sh
sb_battery() {
    CAPACITY="$(cat /sys/class/power_supply/BAT0/capacity)%"
    STATE="$(cat /sys/class/power_supply/BAT0/status)"
    echo "$CAPACITY ($STATE)"
}
#+end_src

Now comes an indicator for Docker containers which will be displayed
only if at least one is running.
#+begin_src sh
sb_docker() {
    DOCKER_RUNNING="$(docker ps -q | wc -l)"
    # echo "Docker: $DOCKER_RUNNING"
    if [ "$DOCKER_RUNNING" = "0" ]
    then echo ""
    else echo "Docker: $DOCKER_RUNNING | "
    fi
}
#+end_src

Finally, let’s display everything.
#+begin_src sh
echo "$(sb_docker)$(sb_playerctl)$(sb_date)$(sb_battery) "
#+end_src

** Weather
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/we
:END:
A quick and useful script I often use is a ~curl~ request to [[http://v2.wttr.in/][v2.wttr.in]] to get a
weather forecast in the terminal. By default, I want the request to be about the
city I live in, but it is also possible for the script to accept as its
arguments a search inquiry.
#+BEGIN_SRC sh
if [ $# -gt 0 ]; then
    SEARCH=$(printf "%s+" "$@")
    SEARCH=${SEARCH%+}
    curl "http://v2.wttr.in/~$SEARCH"
else
    curl "http://v2.wttr.in/Aubervilliers"
fi
#+END_SRC

** Wrappers
:PROPERTIES:
:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes
:END:
In order to avoid clutter in my =$HOME= directory, I have some wrappers
around some commands that simply add some options by default.

#+begin_src sh :tangle ~/.local/bin/adb
HOME="$XDG_DATA_HOME"/android /usr/bin/adb "$@"
#+end_src

#+begin_src sh :tangle ~/.local/bin/mbsync
/usr/bin/mbsync -c "$XDG_CONFIG_HOME"/isync/mbsyncrc "$@"
#+end_src

#+begin_src sh :tangle ~/.local/bin/wget
/usr/bin/wget --hsts-file="$XDG_DATA_HOME"/wget-hsts "$@"
#+end_src

#+begin_src sh :tangle ~/.local/bin/yarn
/usr/bin/yarn --use-yarnrc "$XDG_CONFIG_HOME"/yarn/config "$@"
#+end_src