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+# Necessary to add this line and keep it at the top of my ~/.zshrc to ensure
+# that Tramp works as expected. This was taken from here:
+# https://www.emacswiki.org/emacs/TrampMode
+[[ $TERM == "dumb" ]] && unsetopt zle && PS1='$ ' && return
+
+source ~/antigen.zsh
+
+# Helper functions
+# TODO: Find a way to share these functions across zsh files.
+defensively_source() {
+  # Checks if the file exists before sourcing it
+  if [ -f $1 ]; then
+    source $1
+  else
+    "Cannot source: $1. Aborting..."
+  fi
+}
+
+command_exists() {
+  # Predicate to check if the command exists
+  command -v $1 >/dev/null
+}
+
+# TODO: remove this from here
+export DOTFILES=$HOME/Dropbox/dotfiles
+
+# Load the oh-my-zsh library
+antigen use oh-my-zsh
+
+# Bundles from robbyrussell's oh-my-zsh repo.
+antigen bundle git
+antigen bundle extract         # extracts archives polymorphically
+antigen bundle zsh-completions # extracts archives polymorphically
+
+# Syntax highlighting
+antigen bundle zsh-users/zsh-syntax-highlighting
+
+# Theming
+case $(hostname) in
+  # desktop
+  wpcarro.lon.corp.google.com)
+    antigen theme frisk;;
+  # cloudtop
+  wpcarro.c.googlers.com)
+    antigen theme cloud;;
+  # laptop
+  wpcarro2)
+    antigen theme refined;;
+  # acer NixOS laptop
+  acer-manjaro)
+    antigen theme frisk;;
+esac
+
+# Leave this last
+antigen apply
+
+# Configure fzf
+if command_exists fzf-share; then
+  source "$(fzf-share)/key-bindings.zsh"
+
+  fzf-locate-widget() {
+    # Press M-i to search entire locate database with fzf.
+    local selected
+    if selected=$(locate / | fzf); then
+      LBUFFER+=$selected
+    fi
+    zle redisplay
+  }
+  zle -N fzf-locate-widget
+  bindkey '\ei' fzf-locate-widget
+
+else
+  defensively_source "/usr/share/fzf/key-bindings.zsh"
+fi
+
+# Configure fasd
+eval "$(fasd --init auto)"
+
+# the above line slows tab-completion down dramatically because it attemtps to
+# autocomplete for the 600k+ users found in `compgen -u`. Below is a fix which
+# also restores the function of `cd ~<tab>` to display only ZSH Named
+# Directories.
+zstyle ':completion:*' users root $USER
+
+# Avoiding the defensive source because I want to ensure these files are
+# available.
+source "$DOTFILES/configs/shared/variables.zsh"
+source "$DOTFILES/configs/shared/aliases.zsh"
+source "$DOTFILES/configs/shared/functions.zsh"
+source "$DOTFILES/configs/shared/zle.zsh"
+
+preexec() {
+  # `preexec` runs before every command is run.
+  update_x11_forwarding
+}
+
+defensively_source ~/.rvm/scripts/rvm         # Ruby
+defensively_source ~/.opam/opam-init/init.zsh # OCaml
+defensively_source ~/.ghcup/env               # Haskell
+defensively_source /etc/bash_completion.d/g4d # Google's g4d