oh-my-zsh.sh

# Protect against non-zsh execution of Oh My Zsh (use POSIX syntax here)
[ -n "$ZSH_VERSION" ] || {
  # ANSI formatting function (\033[<code>m)
  # 0: reset, 1: bold, 4: underline, 22: no bold, 24: no underline, 31: red, 33: yellow
  omz_f() {
    [ $# -gt 0 ] || return
    IFS=";" printf "\033[%sm" $*
  }
  # If stdout is not a terminal ignore all formatting
  [ -t 1 ] || omz_f() { :; }

  omz_ptree() {
    # Get process tree of the current process
    pid=$$; pids="$pid"
    while [ ${pid-0} -ne 1 ] && ppid=$(ps -e -o pid,ppid | awk "\$1 == $pid { print \$2 }"); do
      pids="$pids $pid"; pid=$ppid
    done

    # Show process tree
    case "$(uname)" in
    Linux) ps -o ppid,pid,command -f -p $pids 2>/dev/null ;;
    Darwin|*) ps -o ppid,pid,command -p $pids 2>/dev/null ;;
    esac

    # If ps command failed, try Busybox ps
    [ $? -eq 0 ] || ps -o ppid,pid,comm | awk "NR == 1 || index(\"$pids\", \$2) != 0"
  }

  {
    shell=$(ps -o pid,comm | awk "\$1 == $$ { print \$2 }")
    printf "$(omz_f 1 31)Error:$(omz_f 22) Oh My Zsh can't be loaded from: $(omz_f 1)${shell}$(omz_f 22). "
    printf "You need to run $(omz_f 1)zsh$(omz_f 22) instead.$(omz_f 0)\n"
    printf "$(omz_f 33)Here's the process tree:$(omz_f 22)\n\n"
    omz_ptree
    printf "$(omz_f 0)\n"
  } >&2

  return 1
}

# If ZSH is not defined, use the current script's directory.
[[ -z "$ZSH" ]] && export ZSH="${${(%):-%x}:a:h}"

# Set ZSH_CACHE_DIR to the path where cache files should be created
# or else we will use the default cache/
if [[ -z "$ZSH_CACHE_DIR" ]]; then
  ZSH_CACHE_DIR="$ZSH/cache"
fi

# Make sure $ZSH_CACHE_DIR is writable, otherwise use a directory in $HOME
if [[ ! -w "$ZSH_CACHE_DIR" ]]; then
  ZSH_CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/oh-my-zsh"
fi

# Create cache and completions dir and add to $fpath
mkdir -p "$ZSH_CACHE_DIR/completions"
(( ${fpath[(Ie)"$ZSH_CACHE_DIR/completions"]} )) || fpath=("$ZSH_CACHE_DIR/completions" $fpath)

# Check for updates on initial load...
source "$ZSH/tools/check_for_upgrade.sh"

# Initializes Oh My Zsh

# add a function path
fpath=("$ZSH/functions" "$ZSH/completions" $fpath)

# Load all stock functions (from $fpath files) called below.
autoload -U compaudit compinit zrecompile

# Set ZSH_CUSTOM to the path where your custom config files
# and plugins exists, or else we will use the default custom/
if [[ -z "$ZSH_CUSTOM" ]]; then
    ZSH_CUSTOM="$ZSH/custom"
fi

is_plugin() {
  local base_dir=$1
  local name=$2
  builtin test -f $base_dir/plugins/$name/$name.plugin.zsh \
    || builtin test -f $base_dir/plugins/$name/_$name
}

# Add all defined plugins to fpath. This must be done
# before running compinit.
for plugin ($plugins); do
  if is_plugin "$ZSH_CUSTOM" "$plugin"; then
    fpath=("$ZSH_CUSTOM/plugins/$plugin" $fpath)
  elif is_plugin "$ZSH" "$plugin"; then
    fpath=("$ZSH/plugins/$plugin" $fpath)
  else
    echo "[oh-my-zsh] plugin '$plugin' not found"
  fi
done

# Figure out the SHORT hostname
if [[ "$OSTYPE" = darwin* ]]; then
  # macOS's $HOST changes with dhcp, etc. Use ComputerName if possible.
  SHORT_HOST=$(scutil --get ComputerName 2>/dev/null) || SHORT_HOST="${HOST/.*/}"
else
  SHORT_HOST="${HOST/.*/}"
fi

# Save the location of the current completion dump file.
if [[ -z "$ZSH_COMPDUMP" ]]; then
  ZSH_COMPDUMP="${ZDOTDIR:-$HOME}/.zcompdump-${SHORT_HOST}-${ZSH_VERSION}"
fi

# Construct zcompdump OMZ metadata
zcompdump_revision="#omz revision: $(builtin cd -q "$ZSH"; git rev-parse HEAD 2>/dev/null)"
zcompdump_fpath="#omz fpath: $fpath"

# Delete the zcompdump file if OMZ zcompdump metadata changed
if ! command grep -q -Fx "$zcompdump_revision" "$ZSH_COMPDUMP" 2>/dev/null \
   || ! command grep -q -Fx "$zcompdump_fpath" "$ZSH_COMPDUMP" 2>/dev/null; then
  command rm -f "$ZSH_COMPDUMP"
  zcompdump_refresh=1
fi

if [[ "$ZSH_DISABLE_COMPFIX" != true ]]; then
  source "$ZSH/lib/compfix.zsh"
  # Load only from secure directories
  compinit -i -d "$ZSH_COMPDUMP"
  # If completion insecurities exist, warn the user
  handle_completion_insecurities &|
else
  # If the user wants it, load from all found directories
  compinit -u -d "$ZSH_COMPDUMP"
fi

# Append zcompdump metadata if missing
if (( $zcompdump_refresh )) \
  || ! command grep -q -Fx "$zcompdump_revision" "$ZSH_COMPDUMP" 2>/dev/null; then
  # Use `tee` in case the $ZSH_COMPDUMP filename is invalid, to silence the error
  # See https://github.com/ohmyzsh/ohmyzsh/commit/dd1a7269#commitcomment-39003489
  tee -a "$ZSH_COMPDUMP" &>/dev/null <<EOF

$zcompdump_revision
$zcompdump_fpath
EOF
fi
unset zcompdump_revision zcompdump_fpath zcompdump_refresh

# zcompile the completion dump file if the .zwc is older or missing.
if command mkdir "${ZSH_COMPDUMP}.lock" 2>/dev/null; then
  zrecompile -q -p "$ZSH_COMPDUMP"
  command rm -rf "$ZSH_COMPDUMP.zwc.old" "${ZSH_COMPDUMP}.lock" 
fi

# Load all of the config files in ~/oh-my-zsh that end in .zsh
# TIP: Add files you don't want in git to .gitignore
for config_file ("$ZSH"/lib/*.zsh); do
  custom_config_file="$ZSH_CUSTOM/lib/${config_file:t}"
  [[ -f "$custom_config_file" ]] && config_file="$custom_config_file"
  source "$config_file"
done
unset custom_config_file

# Load all of the plugins that were defined in ~/.zshrc
for plugin ($plugins); do
  if [[ -f "$ZSH_CUSTOM/plugins/$plugin/$plugin.plugin.zsh" ]]; then
    source "$ZSH_CUSTOM/plugins/$plugin/$plugin.plugin.zsh"
  elif [[ -f "$ZSH/plugins/$plugin/$plugin.plugin.zsh" ]]; then
    source "$ZSH/plugins/$plugin/$plugin.plugin.zsh"
  fi
done
unset plugin

# Load all of your custom configurations from custom/
for config_file ("$ZSH_CUSTOM"/*.zsh(N)); do
  source "$config_file"
done
unset config_file

# Load the theme
is_theme() {
  local base_dir=$1
  local name=$2
  builtin test -f $base_dir/$name.zsh-theme
}

if [[ -n "$ZSH_THEME" ]]; then
  if is_theme "$ZSH_CUSTOM" "$ZSH_THEME"; then
    source "$ZSH_CUSTOM/$ZSH_THEME.zsh-theme"
  elif is_theme "$ZSH_CUSTOM/themes" "$ZSH_THEME"; then
    source "$ZSH_CUSTOM/themes/$ZSH_THEME.zsh-theme"
  elif is_theme "$ZSH/themes" "$ZSH_THEME"; then
    source "$ZSH/themes/$ZSH_THEME.zsh-theme"
  else
    echo "[oh-my-zsh] theme '$ZSH_THEME' not found"
  fi
fi