repo: Add XDG user dirs config + Update zsh hashes

Create named directories to every visible folder in $HOME for greater
portability.
Set the CDABLE_VARS zsh option.

.config/zsh/plugins/alias.zsh

@@ -112,18 +112,27 @@
 	alias date='env LC_TIME=tk_TM date'
 
 # Named directories
-	hash -d docs=~/docs
-	hash -d down=~/downloads
-	hash -d pics=~/pics
-	hash -d proj=~/projs
+	for dir in "$HOME"/[^.]*(/); do
+		[[ ! ${dir:t} =~ " " ]] || continue
+		hash -d ${dir:t}="$dir"
+	done
 
-	hash -d cheat=~docs/cheat_sheets
-	hash -d dot{,s}=~proj/dotfiles
-	hash -d uni=~docs/uni
-	hash -d work=~docs/work
-
-	# Use the first match in ~uni/[0-9][0-9]-{So,Wi}Se sorted in descending
-	# numeric order (most recent semester). The echo is necessary as else
-	# filename generation will include the wise= and nothing is matched. TODO!
-	hash -d sose="$(echo ~uni/[0-9][0-9]-SoSe(NnOn[1]))"
-	hash -d wise="$(echo ~uni/[0-9][0-9]-WiSe(NnOn[1]))"
+	hash="$(xdg-user-dir DOCUMENTS 2>/dev/null || echo docs)"
+	hash="$(basename "$hash")"
+	if (( $+nameddirs[$hash] )); then
+		hash -d cheat=~$hash/cheat_sheets
+		hash -d uni=~$hash/uni
+		hash -d work=~$hash/work
+	fi
+	unset hash
+	if (( $+nameddirs[projs] )); then
+		hash -d dot{,s}=~projs/dotfiles
+	fi
+	if (( $+nameddirs[uni] )); then
+		# Use the first match in ~uni/[0-9][0-9]-{So,Wi}Se sorted in descending
+		# numeric order (most recent semester). The echo is necessary as else
+		# filename generation will include the wise= and nothing is matched.
+		# TODO!
+		hash -d sose="$(echo ~uni/[0-9][0-9]-SoSe(NnOn[1]))"
+		hash -d wise="$(echo ~uni/[0-9][0-9]-WiSe(NnOn[1]))"
+	fi