diff --git a/plugins/fz/LICENSE b/plugins/fz/LICENSE
new file mode 100644
index 00000000..c135c6fc
--- /dev/null
+++ b/plugins/fz/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017 Henry Chang
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/plugins/fz/README-zh.md b/plugins/fz/README-zh.md
new file mode 100644
index 00000000..fd9b1fd5
--- /dev/null
+++ b/plugins/fz/README-zh.md
@@ -0,0 +1,144 @@
+# fz
+
+完全不須再綁定其他熱鍵，fz 無縫接軌地為 [z](https://github.com/rupa/z) 的 tab 自動完成（自動補全、自動補完、tab completion）加上模糊搜尋功能。使用者可以透過此程式在歷史目錄中自由跳躍。支援 Bash 與 zsh。
+
+* [展示](#展示)
+* [安裝程序](#安裝程序)
+   * [macOS](#macos)
+      * [Bash](#bash)
+      * [zsh](#zsh)
+   * [Ubuntu](#ubuntu)
+      * [Bash](#bash-1)
+      * [zsh](#zsh-1)
+* [使用說明](#使用說明)
+* [相關資訊](#相關資訊)
+* [授權條款](#授權條款)
+
+## 展示
+
+![示意圖](fz-demo.gif)
+
+## 安裝程序
+
+由 shell 中 source 對應的程式檔案即可使用。但因本程式仰仗 [z](https://github.com/rupa/z) 與 [fzf](https://github.com/junegunn/fzf)，故此二者亦須一併安裝至系統中。
+
+注意：`fz` 需在 `z` 之後 source。
+
+### macOS
+
+#### Bash
+
+1. 經由 [Homebrew](https://brew.sh/) 安裝 fzf：
+
+    ```sh
+    brew install fzf
+    ```
+
+2. 下載 z 與 fz：
+
+    ```sh
+    mkdir ~/.bash_completion.d
+    curl "https://raw.githubusercontent.com/rupa/z/master/{z.sh}" \
+        -o ~/.bash_completion.d/"#1"
+    curl "https://raw.githubusercontent.com/changyuheng/fz/master/{fz.sh}" \
+        -o ~/.bash_completion.d/z"#1"
+    ```
+
+3. 在 `~/.bashrc` 中加入以下資訊：
+
+    ```sh
+    if [ -d ~/.bash_completion.d ]; then
+      for file in ~/.bash_completion.d/*; do
+        . $file
+      done
+    fi
+    ```
+
+#### zsh
+
+1. 經由 [Homebrew](https://brew.sh/) 安裝 fzf：
+
+    ```sh
+    brew install fzf
+    ```
+
+2. 透過 [zplug](https://github.com/zplug/zplug) 部署 z 與 fz。將以下資訊加入 `~/.zshrc`：
+
+    ```sh
+    zplug "changyuheng/fz", defer:1
+    zplug "rupa/z", use:z.sh
+    ```
+
+### Ubuntu
+
+#### Bash
+
+1. 安裝 fzf：
+
+    ```sh
+    git clone --depth 1 https://github.com/junegunn/fzf.git ~/.fzf
+    ~/.fzf/install
+    ```
+
+2. 下載 z 與 fz：
+
+    ```sh
+    mkdir ~/.bash_completion.d
+    curl "https://raw.githubusercontent.com/rupa/z/master/{z.sh}" \
+        -o ~/.bash_completion.d/"#1"
+    curl "https://raw.githubusercontent.com/changyuheng/fz/master/{fz.sh}" \
+        -o ~/.bash_completion.d/z"#1"
+    ```
+
+3. 在 `~/.bashrc` 中加入以下資訊：
+
+    ```sh
+    if [ -d ~/.bash_completion.d ]; then
+      for file in ~/.bash_completion.d/*; do
+        . $file
+      done
+    fi
+    ```
+
+#### zsh
+
+1. 安裝 fzf：
+
+    ```sh
+    git clone --depth 1 https://github.com/junegunn/fzf.git ~/.fzf
+    ~/.fzf/install
+    ```
+
+2. 透過 [zplug](https://github.com/zplug/zplug) 部署 z 與 fz。將以下資訊加入 `~/.zshrc`：
+
+    ```sh
+    zplug "changyuheng/fz", defer:1
+    zplug "rupa/z", use:z.sh
+    ```
+
+## 使用說明
+
+```
+z [dir name slug]<TAB>
+zz [dir name slug]<TAB>
+```
+
+- 程式的功能與 [z](https://github.com/rupa/z) 雷同。`zz` 指令限制搜尋範圍為當前目錄及其子目錄。
+- `tab`/`shift-tab`、`ctrl-n`/`ctrl-p`、`ctrl-j`/`ctrl-k` 選擇下一個、上一個選項。`Enter` 確定。
+- `FZ_CMD=z` 指定指令名稱。預設為 `z`。
+- `FZ_SUBDIR_CMD=zz` 指定指令名稱。預設為 `zz`。
+- `FZ_SUBDIR_TRAVERSAL=0` 關閉子目錄補完。預設為開啟。
+- `FZ_CASE_INSENSITIVE=0` 關閉子目錄補完不限大小寫。預設為開啟。
+- `FZ_ABBREVIATE_HOME=0` 不展開 `~` 變數。預設為展開。
+
+## 相關資訊
+
+- [cdr](https://github.com/willghatch/zsh-cdr) + [zaw](https://github.com/zsh-users/zaw)
+- fzf 的[自動完成說明](https://github.com/junegunn/fzf#fuzzy-completion-for-bash-and-zsh)及其[維基頁面](https://github.com/junegunn/fzf/wiki)
+- [fasd](https://github.com/clvv/fasd)
+- [autojump](https://github.com/wting/autojump)
+- [命令行上的narrowing（随着输入逐步减少备选项）工具](http://www.cnblogs.com/bamanzi/p/cli-narrowing-tools.html)
+
+## 授權條款
+
+本軟體以 [MIT 授權條款](LICENSE)授權。
diff --git a/plugins/fz/README.md b/plugins/fz/README.md
new file mode 100644
index 00000000..65b4623b
--- /dev/null
+++ b/plugins/fz/README.md
@@ -0,0 +1,161 @@
+# fz
+
+A shell plugin that seamlessly adds fuzzy search to tab completion of
+[z](https://github.com/rupa/z),
+lets you easy to jump around among your historical directories.
+Not any additional key binding is needed. Currently supports Bash and zsh.
+
+* [Demo](#demo)
+* [Installation](#installation)
+   * [macOS](#macos)
+      * [Bash](#bash)
+      * [zsh](#zsh)
+   * [Ubuntu](#ubuntu)
+      * [Bash](#bash-1)
+      * [zsh](#zsh-1)
+* [Usage](#usage)
+* [See Also](#see-also)
+* [License](#license)
+
+## Demo
+
+![gif-demo](fz-demo.gif)
+
+## Installation
+
+By simply sourcing corresponding script file for your shell, you're all set.
+However, this plugin is sitting on top of [z](https://github.com/rupa/z) and
+[fzf](https://github.com/junegunn/fzf), so you must have them installed as well.
+
+N.B. `fz` needs to be sourced after `z`.
+
+### macOS
+
+#### Bash
+
+1. Install fzf via [Homebrew](https://brew.sh/).
+
+    ```sh
+    brew install fzf
+    ```
+
+2. Download z and fz.
+
+    ```sh
+    mkdir ~/.bash_completion.d
+    curl "https://raw.githubusercontent.com/rupa/z/master/{z.sh}" \
+        -o ~/.bash_completion.d/"#1"
+    curl "https://raw.githubusercontent.com/changyuheng/fz/master/{fz.sh}" \
+        -o ~/.bash_completion.d/z"#1"
+    ```
+
+3. Add the following content to `~/.bashrc`:
+
+    ```sh
+    if [ -d ~/.bash_completion.d ]; then
+      for file in ~/.bash_completion.d/*; do
+        . $file
+      done
+    fi
+    ```
+
+#### zsh
+
+1. Install fzf via [Homebrew](https://brew.sh/).
+
+    ```sh
+    brew install fzf
+    ```
+
+2. Install z and fz via [zplug](https://github.com/zplug/zplug).
+    Add the following content to `~/.zshrc`:
+
+    ```sh
+    zplug "changyuheng/fz", defer:1
+    zplug "rupa/z", use:z.sh
+    ```
+
+### Ubuntu
+
+#### Bash
+
+1. Install fzf.
+
+    ```sh
+    git clone --depth 1 https://github.com/junegunn/fzf.git ~/.fzf
+    ~/.fzf/install
+    ```
+
+2. Download z and fz.
+
+    ```sh
+    mkdir ~/.bash_completion.d
+    curl "https://raw.githubusercontent.com/rupa/z/master/{z.sh}" \
+        -o ~/.bash_completion.d/"#1"
+    curl "https://raw.githubusercontent.com/changyuheng/fz/master/{fz.sh}" \
+        -o ~/.bash_completion.d/z"#1"
+    ```
+
+3. Add the following content to `~/.bashrc`:
+
+    ```sh
+    if [ -d ~/.bash_completion.d ]; then
+      for file in ~/.bash_completion.d/*; do
+        . $file
+      done
+    fi
+    ```
+
+#### zsh
+
+1. Install fzf.
+
+    ```sh
+    git clone --depth 1 https://github.com/junegunn/fzf.git ~/.fzf
+    ~/.fzf/install
+    ```
+
+2. Install z and fz via [zplug](https://github.com/zplug/zplug).
+    Add the following content to `~/.zshrc`:
+
+    ```sh
+    zplug "changyuheng/fz", defer:1
+    zplug "rupa/z", use:z.sh
+    ```
+
+## Usage
+
+```
+z [dir name slug]<TAB>
+zz [dir name slug]<TAB>
+```
+
+- The function of fz is pretty much like what it is of
+    [z](https://github.com/rupa/z).
+    `zz` limits the search base starting from current working directory.
+    Check z’s doc for more information.
+- `tab`/`shift-tab`, `ctrl-n`/`ctrl-p`, `ctrl-j`/`ctrl-k`,
+    for next and previous item. `Enter` for selection.
+    Check fzf’s [doc](https://github.com/junegunn/fzf#search-syntax)
+    for the search syntaxes.
+- `FZ_CMD=z` specifies command name of `fz`. Default is `z`.
+- `FZ_SUBDIR_CMD=zz` specifies command name for subdirectory only `z`.
+    Default is `zz`.
+- `FZ_SUBDIR_TRAVERSAL=0` disables subdirectory completion.
+    Default is enabled.
+- `FZ_CASE_INSENSITIVE=0` disables case-insensitive subdirectory completion.
+    Default is enabled.
+- `FZ_ABBREVIATE_HOME=0` disables abbreviating `~`.  Default is enabled.
+
+## See Also
+
+- [cdr](https://github.com/willghatch/zsh-cdr) + [zaw](https://github.com/zsh-users/zaw)
+- fzf’s [readme of completion](https://github.com/junegunn/fzf#fuzzy-completion-for-bash-and-zsh)
+    and its [wiki](https://github.com/junegunn/fzf/wiki)
+- [fasd](https://github.com/clvv/fasd)
+- [autojump](https://github.com/wting/autojump)
+- [命令行上的narrowing（随着输入逐步减少备选项）工具](http://www.cnblogs.com/bamanzi/p/cli-narrowing-tools.html)
+
+## License
+
+This software is licensed under a [MIT License](LICENSE).
diff --git a/plugins/fz/fz-demo.gif b/plugins/fz/fz-demo.gif
new file mode 100644
index 00000000..d293cc4f
Binary files /dev/null and b/plugins/fz/fz-demo.gif differ
diff --git a/plugins/fz/fz.bash b/plugins/fz/fz.bash
new file mode 120000
index 00000000..cd78f6a1
--- /dev/null
+++ b/plugins/fz/fz.bash
@@ -0,0 +1 @@
+fz.sh
\ No newline at end of file
diff --git a/plugins/fz/fz.plugin.zsh b/plugins/fz/fz.plugin.zsh
new file mode 120000
index 00000000..cd78f6a1
--- /dev/null
+++ b/plugins/fz/fz.plugin.zsh
@@ -0,0 +1 @@
+fz.sh
\ No newline at end of file
diff --git a/plugins/fz/fz.sh b/plugins/fz/fz.sh
new file mode 100644
index 00000000..df272970
--- /dev/null
+++ b/plugins/fz/fz.sh
@@ -0,0 +1,297 @@
+[[ -n "$FZ_CMD" ]] || FZ_CMD=z
+[[ -n "$FZ_SUBDIR_CMD" ]] || FZ_SUBDIR_CMD=zz
+
+[[ -n "$FZ_HISTORY_CD_CMD" ]] || FZ_HISTORY_CD_CMD=_z
+[[ -n "$FZ_SUBDIR_HISTORY_CD_CMD" ]] || FZ_SUBDIR_HISTORY_CD_CMD="_z -c"
+
+[[ -n "$FZ_HISTORY_LIST_GENERATOR" ]] \
+  || FZ_HISTORY_LIST_GENERATOR=__fz_generate_matched_history_list
+[[ -n "$FZ_SUBDIR_HISTORY_LIST_GENERATOR" ]] \
+  || FZ_SUBDIR_HISTORY_LIST_GENERATOR=__fz_generate_matched_subdir_history_list
+
+[[ -n "$FZ_SUBDIR_TRAVERSAL" ]] || FZ_SUBDIR_TRAVERSAL=1
+[[ -n "$FZ_CASE_INSENSITIVE" ]] || FZ_CASE_INSENSITIVE=1
+[[ -n "$FZ_ABBREVIATE_HOME" ]] || FZ_ABBREVIATE_HOME=1
+
+alias ${FZ_CMD}='_fz'
+alias ${FZ_SUBDIR_CMD}='_fzz'
+
+__fz_generate_matched_subdir_list() {
+  local dir seg starts_with_dir
+  if [[ "$1" == */ ]]; then
+    dir="$1"
+    find -L "$(cd "$dir" 2>/dev/null && pwd)" -mindepth 1 -maxdepth 1 -type d \
+        2>/dev/null | while read -r line; do
+      base="${line##*/}"
+      if [[ "$base" == .* ]]; then
+        continue
+      fi
+      echo "$line"
+    done
+  else
+    dir=$(dirname -- "$1")
+    seg=$(basename -- "$1")
+    if [[ "$FZ_CASE_INSENSITIVE" == "1" ]]; then
+      seg=$(echo "$seg" | tr '[:upper:]' '[:lower:]')
+    fi
+    starts_with_dir=$( \
+      find -L "$(cd "$dir" 2>/dev/null && pwd)" -mindepth 1 -maxdepth 1 \
+          -type d 2>/dev/null | while read -r line; do \
+        base="${line##*/}"
+        if [[ "$seg" != .* && "$base" == .* ]]; then
+          continue
+        fi
+        if [[ "$FZ_CASE_INSENSITIVE" != "1" ]]; then
+          if [[ "$base" == "$seg"* ]]; then
+            echo "$line"
+          fi
+        else
+          if [[ -n "$BASH_VERSION" ]]; then
+            if [[ "${base,,}" == "${seg,,}"* ]]; then
+              echo "$line"
+            fi
+          elif [[ -n "$ZSH_VERSION" ]]; then
+            if [[ "${base:l}" == "${seg:l}"* ]]; then
+              echo "$line"
+            fi
+          fi
+        fi
+      done
+    )
+    if [ -n "$starts_with_dir" ]; then
+      echo "$starts_with_dir"
+    else
+      find -L "$(cd "$dir" 2>/dev/null && pwd)" -mindepth 1 -maxdepth 1 \
+          -type d 2>/dev/null | while read -r line; do \
+        base="${line##*/}"
+        if [[ "$seg" != .* && "$base" == .* ]]; then
+          continue
+        fi
+        if [[ "$FZ_CASE_INSENSITIVE" != "1" ]]; then
+          if [[ "$base" == *"$seg"* ]]; then
+            echo "$line"
+          fi
+        else
+          if [[ -n "$BASH_VERSION" ]]; then
+            if [[ "${base,,}" == *"${seg,,}"* ]]; then
+              echo "$line"
+            fi
+          elif [[ -n "$ZSH_VERSION" ]]; then
+            if [[ "${base:l}" == *"${seg:l}"* ]]; then
+              echo "$line"
+            fi
+          fi
+        fi
+      done
+    fi
+  fi
+}
+
+__fz_generate_matched_history_list() {
+  _z -l $@ 2>&1 | while read -r line; do
+    if [[ "$line" == common:* ]]; then continue; fi
+    # Reverse the order and cut off the scores
+    echo "$line"
+  done | sed '1!G;h;$!d' | cut -b 12-
+}
+
+__fz_generate_matched_subdir_history_list() {
+  __fz_generate_matched_history_list -c "$@"
+}
+
+__fz_generate_matches() {
+  local cmd histories subdirs
+
+  if [[ -n "$BASH_VERSION" ]]; then
+    cmd=$([[ "${COMP_WORDS[0]}" =~ [[:space:]]*([^[:space:]]|[^[:space:]].*[^[:space:]])[[:space:]]* ]]; \
+      echo -n "${BASH_REMATCH[1]}")
+  elif [[ -n "$ZSH_VERSION" ]]; then
+    cmd=(${(z)LBUFFER})
+    cmd=${cmd[1]}
+  fi
+
+  if [[ "$cmd" == "$FZ_CMD" ]]; then
+    if [[ "$FZ_ABBREVIATE_HOME" == "1" ]]; then
+      if [ "$FZ_SUBDIR_TRAVERSAL" == "1" ]; then
+        cat <("$FZ_HISTORY_LIST_GENERATOR" "$@") \
+          <(__fz_generate_matched_subdir_list "$@") \
+          | sed '/^$/d' | sed -e "s,^$HOME,~," | awk '!seen[$0]++'
+      else
+        cat <("$FZ_HISTORY_LIST_GENERATOR" "$@") \
+          | sed '/^$/d' | sed -e "s,^$HOME,~," | awk '!seen[$0]++'
+      fi
+    else
+      if [ "$FZ_SUBDIR_TRAVERSAL" == "1" ]; then
+        cat <("$FZ_HISTORY_LIST_GENERATOR" "$@") \
+          <(__fz_generate_matched_subdir_list "$@") \
+          | sed '/^$/d' | awk '!seen[$0]++'
+      else
+        cat <("$FZ_HISTORY_LIST_GENERATOR" "$@") \
+          | sed '/^$/d' | awk '!seen[$0]++'
+      fi
+    fi
+  elif [[ "$cmd" == "$FZ_SUBDIR_CMD" ]]; then
+    histories=$("$FZ_SUBDIR_HISTORY_LIST_GENERATOR" "$@")
+    if [[ "$FZ_ABBREVIATE_HOME" == "1" ]]; then
+      if [ "$FZ_SUBDIR_TRAVERSAL" == "1" ]; then
+        cat <("$FZ_SUBDIR_HISTORY_LIST_GENERATOR" "$@") \
+          <(__fz_generate_matched_subdir_list "$@") \
+          | sed '/^$/d' | sed -e "s,^$HOME,~," | awk '!seen[$0]++'
+      else
+        cat <("$FZ_SUBDIR_HISTORY_LIST_GENERATOR" "$@") \
+          | sed '/^$/d' | sed -e "s,^$HOME,~," | awk '!seen[$0]++'
+      fi
+    else
+      if [ "$FZ_SUBDIR_TRAVERSAL" == "1" ]; then
+        cat <("$FZ_SUBDIR_HISTORY_LIST_GENERATOR" "$@") \
+          <(__fz_generate_matched_subdir_list "$@") \
+          | sed '/^$/d' | awk '!seen[$0]++'
+      else
+        cat <("$FZ_SUBDIR_HISTORY_LIST_GENERATOR" "$@") \
+          | sed '/^$/d' | awk '!seen[$0]++'
+      fi
+    fi
+  fi
+}
+
+__fz_bash_completion() {
+  COMPREPLY=()
+
+  local selected slug
+  eval "slug=${COMP_WORDS[@]:(-1)}"
+
+  if [[ "$(__fz_generate_matches "$slug" | head | wc -l)" -gt 1 ]]; then
+    selected=$(__fz_generate_matches "$slug" \
+      | FZF_DEFAULT_OPTS="--height ${FZF_TMUX_HEIGHT:-40%} --reverse \
+      --bind 'shift-tab:up,tab:down' $FZF_DEFAULT_OPTS" fzf)
+  elif [[ "$(__fz_generate_matches "$slug" | head | wc -l)" -eq 1 ]]; then
+    selected=$(__fz_generate_matches "$slug")
+  else
+    return
+  fi
+
+  if [[ -n "$selected" ]]; then
+    if [[ "$FZ_ABBREVIATE_HOME" == "1" ]]; then
+      selected=${selected/#\~/$HOME}
+    fi
+    selected=$(printf %q "$selected")
+    if [[ "$selected" != */ ]]; then
+      selected="${selected}/"
+    fi
+    if [[ "$FZ_ABBREVIATE_HOME" == "1" ]]; then
+      selected=${selected/#$HOME/\~}
+    fi
+    COMPREPLY=( "$selected" )
+  fi
+
+  printf '\e[5n'
+}
+
+__fz_zsh_completion() {
+  setopt localoptions noshwordsplit noksh_arrays noposixbuiltins nonomatch
+  local args cmd selected slug
+
+  args=(${(z)LBUFFER})
+  cmd=${args[1]}
+
+  if [[ "$cmd" != "$FZ_CMD" && "$cmd" != "$FZ_SUBDIR_CMD" ]] \
+      || [[ "$cmd" == "$FZ_CMD" && "$LBUFFER" =~ "^\s*$FZ_CMD$" ]] \
+      || [[ "$cmd" == "$FZ_SUBDIR_CMD" && "$LBUFFER" =~ "^\s*$FZ_SUBDIR_CMD$" ]]; then
+    zle ${__fz_zsh_default_completion:-expand-or-complete}
+    return
+  fi
+
+  if [[ "${#args}" -gt 1 ]]; then
+    eval "slug=${args[-1]}"
+  fi
+
+  if [[ "$(__fz_generate_matches "$slug" | head | wc -l)" -gt 1 ]]; then
+    selected=$(__fz_generate_matches "$slug" \
+      | FZF_DEFAULT_OPTS="--height ${FZF_TMUX_HEIGHT:-40%} --reverse \
+      --bind 'shift-tab:up,tab:down' $FZF_DEFAULT_OPTS" fzf)
+  elif [[ "$(__fz_generate_matches "$slug" | head | wc -l)" -eq 1 ]]; then
+    selected=$(__fz_generate_matches "$slug")
+  else
+    return
+  fi
+
+  if [[ -n "$selected" ]]; then
+    if [[ "$FZ_ABBREVIATE_HOME" == "1" ]]; then
+      selected=${selected/#\~/$HOME}
+    fi
+    selected="${(q)selected}"
+    if [[ "$selected" != */ ]]; then
+      selected="${selected}/"
+    fi
+    if [[ "$FZ_ABBREVIATE_HOME" == "1" ]]; then
+      selected=${selected/#$HOME/\~}
+    fi
+    LBUFFER="$cmd $selected"
+  fi
+
+  zle redisplay
+  typeset -f zle-line-init >/dev/null && zle zle-line-init
+}
+
+__fz_init_bash_completion() {
+  # Enable redrawing line by printf '\e[5n'
+  bind '"\e[0n": redraw-current-line'
+
+  complete -o nospace -F __fz_bash_completion "$FZ_CMD"
+  complete -o nospace -F __fz_bash_completion "$FZ_SUBDIR_CMD"
+}
+
+__fz_init_zsh_completion() {
+  [ -n "$__fz_zsh_default_completion" ] || {
+    binding=$(bindkey '^I')
+    # $binding[(s: :w)2]
+    # The command substitution and following word splitting to determine the
+    # default zle widget for ^I formerly only works if the IFS parameter contains
+    # a space via $binding[(w)2]. Now it specifically splits at spaces, regardless
+    # of IFS.
+    # It’s not compatitable with bash so use awk instead.
+    [[ $binding =~ 'undefined-key' ]] \
+      || __fz_zsh_default_completion=$(echo "$binding" | awk '{print $2}')
+    unset binding
+  }
+  zle -N __fz_zsh_completion
+  bindkey '^I' __fz_zsh_completion
+}
+
+_fz() {
+  local rc
+  if [[ "$($FZ_HISTORY_LIST_GENERATOR "$@" | head | wc -l)" -gt 0 ]]; then
+    "$FZ_HISTORY_CD_CMD" "$@"
+  elif [[ "$FZ_SUBDIR_TRAVERSAL" -ne 0 ]]; then
+    err=$(cd "${@: -1}" 2>&1)
+    rc=$?
+    if ! cd "${@: -1}" 2>/dev/null; then
+      echo ${err#* } >&2
+      return $rc
+    fi
+  fi
+}
+
+_fzz() {
+  local rc
+  if [[ "$($FZ_SUBDIR_HISTORY_LIST_GENERATOR "$@" | head | wc -l)" -gt 0 ]]; then
+    if [[ -n "$BASH_VERSION" ]]; then
+      $FZ_SUBDIR_HISTORY_CD_CMD "$@"
+    elif [[ -n "$ZSH_VERSION" ]]; then
+      ${=FZ_SUBDIR_HISTORY_CD_CMD} "$@"
+    fi
+  elif [[ "$FZ_SUBDIR_TRAVERSAL" -ne 0 ]]; then
+    err=$(cd "${@: -1}" 2>&1)
+    rc=$?
+    if ! cd "${@: -1}" 2>/dev/null; then
+      echo ${err#* } >&2
+      return $rc
+    fi
+  fi
+}
+
+if [[ -n "$BASH_VERSION" ]]; then
+  __fz_init_bash_completion
+elif [[ -n "$ZSH_VERSION" ]]; then
+  __fz_init_zsh_completion
+fi