Fix mkcd alias, add some shellfunctions

cd is a built-in shell command that changes the internal shell state
via the chdir() syscall. This cannot be called from a script.

.config/zsh/.zshrc

@@ -100,7 +100,6 @@ alias la="\ls -lAGh --color --group-directories-first"
 alias less="less -x 4"
 alias ls="ls --color --group-directories-first"
 alias md="mkdir -p"
-alias mkcd="aliases mkcd"
 alias mv='mv -i'
 alias pkill="pkill -9"
 alias q="exit"
@@ -171,13 +170,15 @@ alias screencast="aliases screencast"
 alias stream="aliases stream"
 alias weather="curl -s 'https://wttr.in/dordrecht?q&n&p' | head -n -3"
 alias webmconvert="aliases webmconvert"
-alias workbench="GDK_SCALE=1 GDK_DPI_SCALE=1 mysql-workbench > /dev/null 2>&1 & disown"
+alias workbench="GDK_SCALE=1 GDK_DPI_SCALE=1 setsid -f -- mysql-workbench > /dev/null 2>&1"
 alias ytv="youtube-dl -f bestvideo\[height\<=\?1080\]+bestaudio/best"
 alias ytvb="youtube-dl -f bestvideo+bestaudio/best"
 alias yta="youtube-dl -f bestaudio/best -x --audio-format mp3 --audio-quality 0" # --embed-thumbnail"
 alias ytat="aliases ytaudio_thumbnail"
 
-zsh="/usr/share/zsh/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh"
-[ -f "$zsh" ] && source "$zsh"; unset zsh
+mkcd() { mkdir -p -- "$1" && cd -P -- "$1" || exit; }
+
+highlighting="/usr/share/zsh/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh"
+[ -f "$highlighting" ] && source "$highlighting"; unset highlighting
 
 [ -f "$ZDOTDIR/.zshrc_extended" ] && source "$ZDOTDIR/.zshrc_extended"

.local/bin/aliases

@@ -34,10 +34,6 @@ java_run () {
 	java -cp './out' "$1"
 }
 
-mkcd() {
-    mkdir -p "$1" && cd "$1" || exit
-}
-
 # Search for packages, by name only
 pacman_search() {
 	pacman -Ss "$1" --color=always | \
@@ -90,6 +86,16 @@ screencast() {
 	fi
 }
 
+sha384sum() {
+	tmpfile=$(mktemp)
+	curl -o "$tmpfile" "$1" && openssl dgst -sha384 -binary "$tmpfile" | openssl base64 -A
+	rm -f "$tmpfile"
+}
+
+shuffle() {
+	echo "$1" | fold -w 1 | shuf | tr -d '\n'
+}
+
 stream() {
 	QUALITY=${2:-"720p"}