diff --git a/.gitignore b/.gitignore
index 6c04b8b..1f52114 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,3 +34,5 @@ node_modules
 ssh/local.d/*
 !ssh/local.d/.gitkeep
 config/fish/fish_variables
+**/exports-secret.fish
+config/fish/completions/asdf.fish
diff --git a/config/exports b/config/exports
index f31e934..58191ff 100755
--- a/config/exports
+++ b/config/exports
@@ -489,4 +489,3 @@ export SQLITE_HISTORY="${XDG_CACHE_HOME}/sqlite_history"
 [ -f "$XDG_CONFIG_HOME/exports-local" ] && source "$XDG_CONFIG_HOME/exports-local"
 [ -f "$XDG_CONFIG_HOME/exports-$(hostname)" ] && source "$XDG_CONFIG_HOME/exports-$(hostname)"
 [ -f "$XDG_CONFIG_HOME/exports-$(hostname)-secret" ] && source "$XDG_CONFIG_HOME/exports-$(hostname)-secret"
-
diff --git a/config/fish/config.fish b/config/fish/config.fish
index b73fd2e..8cf4b82 100644
--- a/config/fish/config.fish
+++ b/config/fish/config.fish
@@ -2,13 +2,12 @@
 # │                     fish/config.fish                     │
 # ╰──────────────────────────────────────────────────────────╯
 
-# ASDF configuration code
-source $HOME/.local/asdf/asdf.fish
-
-fish_add_path $HOME/.local/bin
-fish_add_path $HOME/.local/share/nvim/mason/bin
-fish_add_path $HOME/.local/state/composer/vendor/bin
+test -e "$HOME/.config/fish/exports.fish" &&
+  source "$HOME/.config/fish/exports.fish"
 
 if status is-interactive
   # Commands to run in interactive sessions can go here
+
+  # Start tmux if not already running and not in SSH
+  open-tmux # defined in functions/open-tmux.fish
 end
diff --git a/config/fish/exports.fish b/config/fish/exports.fish
new file mode 100644
index 0000000..ea45b12
--- /dev/null
+++ b/config/fish/exports.fish
@@ -0,0 +1,210 @@
+#!/usr/bin/env fish
+
+# Set XDG environment variables
+test -z "$XDG_CONFIG_HOME" && set -x XDG_CONFIG_HOME "$HOME/.config"
+test -z "$XDG_DATA_HOME" && set -x XDG_DATA_HOME "$HOME/.local/share"
+test -z "$XDG_CACHE_HOME" && set -x XDG_CACHE_HOME "$HOME/.cache"
+test -z "$XDG_STATE_HOME" && set -x XDG_STATE_HOME "$HOME/.local/state"
+test -z "$XDG_BIN_HOME" && set -x XDG_BIN_HOME "$HOME/.local/bin"
+test -z "$XDG_RUNTIME_DIR" && set -x XDG_RUNTIME_DIR "$HOME/.local/run"
+
+# Set dotfiles directory
+test -z "$DOTFILES" && set -x DOTFILES "$HOME/.dotfiles"
+
+# Set other environment variables
+test -z "$EDITOR" && set -x EDITOR "nvim"
+test -z "$VISUAL" && set -x VISUAL "code"
+test -z "$HOSTNAME" && set -x HOSTNAME (hostname -s)
+
+# Add local bin to path
+fish_add_path "$XDG_BIN_HOME"
+
+# Set npm environment variables
+test -z "$NPM_CONFIG_PREFIX" && set -x NPM_CONFIG_PREFIX "$XDG_DATA_HOME/npm"
+fish_add_path "$NPM_CONFIG_PREFIX/bin"
+
+# Set yarn environment variables
+test -z "$YARN_GLOBAL_FOLDER" && set -x YARN_GLOBAL_FOLDER "$XDG_DATA_HOME/yarn"
+fish_add_path "$YARN_GLOBAL_FOLDER/bin"
+
+# Set mason environment variables
+test -z "$MASON_HOME" && set -x MASON_HOME "$XDG_DATA_HOME/nvim/mason"
+fish_add_path "$MASON_HOME/bin"
+
+# Set ASDF environment variables
+test -z "$ASDF_DATA_DIR" && set -x ASDF_DATA_DIR "$XDG_DATA_HOME/asdf"
+test -z "$ASDF_LOG_PATH" && set -x ASDF_LOG_PATH "$XDG_STATE_HOME/asdf/log"
+test -z "$ASDF_CONFIG_DIR" && set -x ASDF_CONFIG_DIR "$XDG_CONFIG_HOME/asdf"
+test -z "$ASDF_CONFIG_FILE" && set -x ASDF_CONFIG_FILE "$ASDF_CONFIG_DIR/asdfrc"
+
+## Default package files
+test -z "$ASDF_CRATE_DEFAULT_PACKAGES_FILE" && set -x ASDF_CRATE_DEFAULT_PACKAGES_FILE "$ASDF_CONFIG_DIR/cargo-packages"
+test -z "$ASDF_GEM_DEFAULT_PACKAGES_FILE" && set -x ASDF_GEM_DEFAULT_PACKAGES_FILE "$ASDF_CONFIG_DIR/gem-packages"
+test -z "$ASDF_GOLANG_DEFAULT_PACKAGES_FILE" && set -x ASDF_GOLANG_DEFAULT_PACKAGES_FILE "$ASDF_CONFIG_DIR/golang-packages"
+test -z "$ASDF_NPM_DEFAULT_PACKAGES_FILE" && set -x ASDF_NPM_DEFAULT_PACKAGES_FILE "$ASDF_CONFIG_DIR/npm-packages"
+test -z "$ASDF_PYTHON_DEFAULT_PACKAGES_FILE" && set -x ASDF_PYTHON_DEFAULT_PACKAGES_FILE "$ASDF_CONFIG_DIR/python-packages"
+
+## Plugin configuration
+set -x ASDF_DIRENV_IGNORE_MISSING_PLUGINS "1"
+set -x ASDF_GOLANG_MOD_VERSION_ENABLED "true"
+set -x ASDF_NODEJS_LEGACY_FILE_DYNAMIC_STRATEGY "latest_available"
+test -z "$ASDF_GOLANG_MOD_VERSION_ENABLED" && set -x ASDF_GOLANG_MOD_VERSION_ENABLED "true"
+
+## Load ASDF, if it exists
+test -f "$HOME/.local/asdf/asdf.fish" &&
+  source "$HOME/.local/asdf/asdf.fish" &&
+  asdf reshim &&
+  fish_add_path "$ASDF_DIR/shims"
+## If $HOME/.local/asdf/asdf.fish does not exist, show error message
+test -e "$HOME/.local/asdf/asdf.fish" || echo "ASDF not found"
+
+# Load ASDF completions
+test -d "$XDG_CONFIG_HOME/fish/completions" ||
+  mkdir -p "$XDG_CONFIG_HOME/fish/completions";
+test -e "$XDG_CONFIG_HOME/fish/completions/asdf.fish" ||
+  and ln -s "$ASDF_DIR/completions/asdf.fish" "$XDG_CONFIG_HOME/fish/completions/asdf.fish"
+
+# Set Neovim environment variables
+test -z "$NVIM_STATE" && set -x NVIM_STATE "$XDG_STATE_HOME/nvim"
+test -z "$NVIM_CONFIG_HOME" && set -x NVIM_CONFIG_HOME "$XDG_CONFIG_HOME/nvim"
+test -z "$NVIM_DATA_HOME" && set -x NVIM_DATA_HOME "$XDG_DATA_HOME/nvim"
+test -z "$NVIM_CACHE_HOME" && set -x NVIM_CACHE_HOME "$XDG_CACHE_HOME/nvim"
+test -z "$NVIM_LOG_PATH" && set -x NVIM_LOG_PATH "$NVIM_STATE/log"
+test -z "$NVIM_SESSION_PATH" && set -x NVIM_SESSION_PATH "$NVIM_STATE/session"
+test -z "$NVIM_SHADA_PATH" && set -x NVIM_SHADA_PATH "$NVIM_STATE/shada"
+test -z "$NVIM_UNDO_PATH" && set -x NVIM_UNDO_PATH "$NVIM_STATE/undo"
+
+# Ansible configuration
+# https://docs.ansible.com/ansible/latest/reference_appendices/config.html
+test -z "$ANSIBLE_HOME" && set -x ANSIBLE_HOME "$XDG_CONFIG_HOME/ansible"
+test -z "$ANSIBLE_CONFIG" && set -x ANSIBLE_CONFIG "$ANSIBLE_HOME/ansible.cfg"
+test -z "$ANSIBLE_GALAXY_CACHE_DIR" && set -x ANSIBLE_GALAXY_CACHE_DIR "$XDG_CACHE_HOME/ansible/galaxy_cache"
+x-dc "$ANSIBLE_HOME"
+x-dc "$ANSIBLE_GALAXY_CACHE_DIR"
+
+# AWS configuration
+test -z "$AWS_CONFIG_FILE" && set -x AWS_CONFIG_FILE "$XDG_STATE_HOME/aws/config"
+test -z "$AWS_SHARED_CREDENTIALS_FILE" && set -x AWS_SHARED_CREDENTIALS_FILE "$XDG_STATE_HOME/aws/credentials"
+test -z "$AWS_SESSION_TOKEN" && set -x AWS_SESSION_TOKEN "$XDG_STATE_HOME/aws/session_token"
+test -z "$AWS_DATA_PATH" && set -x AWS_DATA_PATH "$XDG_DATA_HOME/aws"
+test -z "$AWS_DEFAULT_OUTPUT" && set -x AWS_DEFAULT_OUTPUT "table"
+test -z "$AWS_CONFIGURE_KEYS" && set -x AWS_CONFIGURE_KEYS "true"
+test -z "$AWS_CONFIGURE_SESSION" && set -x AWS_CONFIGURE_SESSION "true"
+test -z "$AWS_CONFIGURE_SESSION_DURATION" && set -x AWS_CONFIGURE_SESSION_DURATION "7200"
+test -z "$AWS_CONFIGURE_SESSION_MFA" && set -x AWS_CONFIGURE_SESSION_MFA "true"
+test -z "$AWS_CONFIGURE_PROFILE" && set -x AWS_CONFIGURE_PROFILE "true"
+test -z "$AWS_CONFIGURE_PROMPT" && set -x AWS_CONFIGURE_PROMPT "true"
+test -z "$AWS_CONFIGURE_PROMPT_DEFAULT" && set -x AWS_CONFIGURE_PROMPT_DEFAULT "true"
+
+# Brew configuration
+test -z "$HOMEBREW_NO_ANALYTICS" && set -x HOMEBREW_NO_ANALYTICS "true"
+test -z "$HOMEBREW_NO_ENV_HINTS" && set -x HOMEBREW_NO_ENV_HINTS "true"
+test -z "$HOMEBREW_BUNDLE_MAS_SKIP" && set -x HOMEBREW_BUNDLE_MAS_SKIP "true"
+test -z "$HOMEBREW_BUNDLE_FILE" && set -x HOMEBREW_BUNDLE_FILE "$XDG_CONFIG_HOME/homebrew/Brewfile"
+
+# Set composer environment variables
+test -z "$COMPOSER_HOME" && set -x COMPOSER_HOME "$XDG_STATE_HOME/composer"
+test -z "$COMPOSER_BIN" && set -x COMPOSER_BIN "$COMPOSER_HOME/vendor/bin"
+fish_add_path "$COMPOSER_BIN"
+
+# direnv, https://direnv.net/
+# https://direnv.net/docs/hook.html
+# Set the hook to show the direnv message in a different color
+# export DIRENV_LOG_FORMAT=$'\033[2mdirenv: %s\033[0m'
+test -z "$DIRENV_LOG_FORMAT" && set -x DIRENV_LOG_FORMAT ''
+
+# docker, https://docs.docker.com/engine/reference/commandline/cli/
+test -z "$DOCKER_CONFIG" && set -x DOCKER_CONFIG "$XDG_CONFIG_HOME/docker"
+x-dc "$DOCKER_CONFIG"
+test -z "$DOCKER_HIDE_LEGACY_COMMANDS" && set -x DOCKER_HIDE_LEGACY_COMMANDS "true"
+# Docke: Disable snyk ad
+test -z "$DOCKER_SCAN_SUGGEST" && set -x DOCKER_SCAN_SUGGEST "false"
+
+# fzf
+test -z "$FZF_BASE" && set -x FZF_BASE "$XDG_CONFIG_HOME/fzf"
+test -z "$FZF_DEFAULT_OPTS" && set -x FZF_DEFAULT_OPTS '--height 40% --tmux bottom,40% --layout reverse --border top'
+
+# GnuPG
+# https://gnupg.org/documentation/manuals/gnupg/Invoking-GPG.html
+test -z "$GNUPGHOME" && set -x GNUPGHOME "$XDG_DATA_HOME/gnupg"
+
+# Go
+test -z "$GOPATH" && set -x GOPATH "$XDG_DATA_HOME/go"
+test -z "$GOBIN" && set -x GOBIN "$XDG_BIN_HOME"
+fish_add_path "$GOBIN"
+
+# NPM: Add npm packages to path
+if x-have node;
+  set -x NVM_NODE_BIN_DIR $(dirname $(which node))
+  fish_add_path "$NVM_NODE_BIN_DIR"
+end
+
+# 1Password
+test -z "$OP_CACHE" && set -x OP_CACHE "$XDG_STATE_HOME/1password"
+
+# Python
+test -z "$WORKON_HOME" && set -x WORKON_HOME "$XDG_DATA_HOME/virtualenvs"
+test -z "$PYENV_ROOT" && set -x PYENV_ROOT "$XDG_DATA_HOME/pyenv"
+fish_add_path "$PYENV_ROOT/bin"
+
+## Set poetry environment variables
+test -z "$POETRY_HOME" && set -x POETRY_HOME "$XDG_DATA_HOME/poetry"
+fish_add_path "$POETRY_HOME/bin"
+
+# Rust / cargo
+test -z "$CARGO_HOME" && set -x CARGO_HOME "$XDG_DATA_HOME/cargo"
+test -z "$CARGO_BIN_HOME" && set -x CARGO_BIN_HOME "$XDG_BIN_HOME"
+test -z "$RUSTUP_HOME" && set -x RUSTUP_HOME "$XDG_DATA_HOME/rustup"
+set -x RUST_WITHOUT "clippy,docs,rls"
+fish_add_path "$CARGO_BIN_HOME"
+fish_add_path "$XDG_SHARE_HOME/bob/nvim-bin"
+
+# screen
+# https://www.gnu.org/software/screen/manual/screen.html
+test -z "$SCREENRC" && set -x SCREENRC "$XDG_CONFIG_HOME/misc/screenrc"
+
+# Sonarlint
+test -z "$SONARLINT_HOME" && set -x SONARLINT_HOME "$XDG_DATA_HOME/sonarlint"
+test -z "$SONARLINT_BIN" && set -x SONARLINT_BIN "$XDG_BIN_HOME"
+test -z "$SONARLINT_USER_HOME" && set -x SONARLINT_USER_HOME "$XDG_DATA_HOME/sonarlint"
+
+# Terraform
+test -z "$TF_DATA_DIR" && set -x TF_DATA_DIR "$XDG_STATE_HOME/terraform"
+test -z "$TF_CLI_CONFIG_FILE" && set -x TF_CLI_CONFIG_FILE "$XDG_CONFIG_HOME/terraform/terraformrc"
+test -z "$TF_PLUGIN_CACHE_DIR" && set -x TF_PLUGIN_CACHE_DIR "$XDG_CACHE_HOME/terraform/plugin-cache"
+
+# tmux
+# https://tmux.github.io/
+test -z "$TMUX_TMPDIR" && set -x TMUX_TMPDIR "$XDG_STATE_HOME/tmux"
+test -z "$TMUX_CONF_DIR" && set -x TMUX_CONF_DIR "$XDG_CONFIG_HOME/tmux"
+test -z "$TMUX_PLUGINS" && set -x TMUX_PLUGINS "$TMUX_CONF_DIR/plugins"
+test -z "$TMUX_CONF" && set -x TMUX_CONF "$TMUX_CONF_DIR/tmux.conf"
+test -z "$TMUX_PLUGIN_MANAGER_PATH" && set -x TMUX_PLUGIN_MANAGER_PATH "$TMUX_PLUGINS"
+
+# tms
+# https://github.com/jrmoulton/tmux-sessionizer
+test -z "$TMS_CONFIG_FILE" && set -x TMS_CONFIG_FILE "$XDG_CONFIG_HOME/tms/config.toml"
+
+# wakatime
+# https://github.com/wakatime/wakatime-cli
+test -z "$WAKATIME_HOME" && set -x WAKATIME_HOME "$XDG_STATE_HOME/wakatime"
+x-dc "$WAKATIME_HOME"
+
+# misc
+test -z "$CHEAT_USE_FZF" && set -x CHEAT_USE_FZF "true"
+test -z "$SQLITE_HISTORY" && set -x SQLITE_HISTORY "$XDG_CACHE_HOME/sqlite/sqlite_history"
+
+# Source exports-secret.fish if it exists
+if test -f "$DOTFILES/config/fish/exports-secret.fish"
+  source "$DOTFILES/config/fish/exports-secret.fish"
+end
+
+# Source $DOTFILES/hosts/$HOSTNAME/config/fish/exports.fish if it exists
+if test -f "$DOTFILES/hosts/$HOSTNAME/config/fish/exports.fish"
+  source "$DOTFILES/hosts/$HOSTNAME/config/fish/exports.fish"
+end
+
+# Source $DOTFILES/hosts/$HOSTNAME/config/fish/exports-secret.fish if it exists
+if test -f "$DOTFILES/hosts/$HOSTNAME/config/fish/exports-secret.fish"
+  source "$DOTFILES/hosts/$HOSTNAME/config/fish/exports-secret.fish"
+end
diff --git a/config/fish/functions/open-tmux.fish b/config/fish/functions/open-tmux.fish
new file mode 100644
index 0000000..c0ee247
--- /dev/null
+++ b/config/fish/functions/open-tmux.fish
@@ -0,0 +1,10 @@
+# Description: Open tmux session if not already open
+# Dependencies: tmux
+# Usage: open-tmux
+function open-tmux --wraps='tmux attach-session -t main || tmux new-session -s main' --description 'open tmux session'
+  if test -z "$SSH_TTY"
+    if not set -q TMUX
+      tmux attach-session -t main || tmux new-session -s main
+    end
+  end
+end