Migrate zsh config to XDG base dir location

.zshenv still needs to live in ~ for bootstrapping, but everything else
is now squirrelled away in ~/.config/zsh instead.

Note that zplug still lives in ~/.zplug - it should be relocated too but
hasn't been yet.

.config/zsh/.zprofile

@@ -0,0 +1 @@
+zprofile

.config/zsh/.zshrc

@@ -0,0 +1 @@
+zshrc

.config/zsh/interactive/history

@@ -1,5 +1,5 @@
 #! zsh
-HISTFILE=~/.zsh/zhistory
+HISTFILE=$XDG_DATA_HOME/zsh/history
 HISTSIZE=50000
 SAVEHIST=$HISTSIZE
 

.config/zsh/interactive/iterm2

@@ -0,0 +1 @@
+../../../../../.iterm2_shell_integration.zsh

.config/zsh/login/fpath

@@ -1,5 +1,5 @@
 #! zsh
-fpath=(~/.zsh/functions $fpath)
+fpath=($ZDOTDIR/functions $fpath)
 
 # filter out duplicates, nonexistent directories, and . (the current directory)
 fpath=(${(u)^fpath:#.}(N))

.config/zsh/zplug

@@ -22,6 +22,6 @@ apply-trapd00r-colors() {
 	zstyle ':completion:*:default' list-colors ${(s.:.)LS_COLORS}
 }
 
-zplug ~/.zsh/interactive/\*, from:local
+zplug $ZDOTDIR/interactive/\*, from:local
 zplug check || zplug install
 zplug load

.config/zsh/zprofile

@@ -0,0 +1 @@
+for f in $ZDOTDIR/login/*(-.N); source $f

.config/zsh/zshenv

@@ -0,0 +1 @@
+for f in $ZDOTDIR/all/*(-.N); source $f

.config/zsh/zshrc

@@ -0,0 +1,2 @@
+source $ZDOTDIR/zplug
+[[ -o login ]] && for f in $ZDOTDIR/interactive+login/*(-.N); source $f

.stow-local-ignore

@@ -1,3 +1,2 @@
 ^/\.git
-^/\.stow-no-fold
 ^/README\.md

.stow-no-fold

@@ -1 +0,0 @@
-.zsh/zhistory

.zprofile

@@ -1 +0,0 @@
-for f in ~/.zsh/login/*(-.N); source $f

.zsh/interactive/iterm2

@@ -1 +0,0 @@
-../../../../.iterm2_shell_integration.zsh

.zshenv

@@ -1 +1,4 @@
-for f in ~/.zsh/all/*(-.N); source $f
+: ${XDG_CONFIG_HOME:=~/.config} ${XDG_CACHE_HOME:=~/.cache} ${XDG_DATA_HOME:=~/.local/share}
+export XDG_CONFIG_HOME XDG_CACHE_HOME XDG_DATA_HOME
+: ${ZDOTDIR:=$XDG_CONFIG_HOME/zsh}
+source $ZDOTDIR/zshenv

.zshrc

@@ -1,2 +0,0 @@
-source ~/.zsh/zplug
-[[ -o login ]] && for f in ~/.zsh/interactive+login/*(-.N); source $f