Teach various tools XDG Base Directory spec manners

.gitignore

@@ -1,2 +1,2 @@
 # Ignore all plugin files in subdirectories
-*/*
+*/

zshenv

@@ -20,7 +20,7 @@ PATH=$HOME/.local/bin:$PATH
 MANPATH=$HOME/.local/share/man:$MANPATH
 INFOPATH=$HOME/.local/share/info:$INFOPATH
 
-# Add ccache to the PATH and use XDG base dir paths
+# Add ccache compiler aliases to PATH and use XDG base dir paths
 if [ `uname` = Darwin ]; then
   [ -d /usr/local/opt/python/libexec/bin ] && \
     PATH=/usr/local/opt/python/libexec/bin:$PATH
@@ -75,3 +75,23 @@ export VIRTUAL_ENV_DISABLE_PROMPT=1
 # If pinentry-curses exists, use it for lastpass-cli
 which pinentry-curses &> /dev/null && \
   export LPASS_PINENTRY=pinentry-curses
+
+# Teach these some XDG Base Directory Spec manners
+which cargo &> /dev/null && \
+  export CARGO_HOME=$HOME/.local/share/cargo
+if which ccache &> /dev/null; then
+  export CCACHE_CONFIGPATH=$HOME/.config/ccache.conf
+  export CCACHE_DIR=$HOME/.cache/ccache
+fi
+which conan &> /dev/null && \
+  export CONAN_USER_HOME=$HOME/.local/share/conan
+which docker &> /dev/null && \
+  export DOCKER_CONFIG=$HOME/.local/share/docker
+export GTK_RC_FILES=$HOME/.config/gtk/gtkrc
+export GTK2_RC_FILES=$HOME/.config/gtk-2.0/gtkrc
+which rustup &> /dev/null && \
+  export RUSTUP_HOME=$HOME/.local/share/rustup
+export PYLINTHOME=$HOME/.cache/pylint
+# TODO: terminfo
+which wget &> /dev/null && \
+  export WGETRC=$HOME/.config/wgetrc