diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7800b818c4..f4dc0d6160 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -32,7 +32,7 @@ there are a number of additional things to keep in mind.
    - Prefer `zstyle` over environment variables for configuration.
    - Prefer (( ... )) over [[ ... ]] for arithmetic expression.
    - Use the function keyword to define functions.
-   - The 80 character hard limit can be waved for readability.
+   - The 80 character hard limit can be waived for readability.
 
 #### Using an Alternative zprezto Directory
 
diff --git a/README.md b/README.md
index 18bcfcce4e..552784bae7 100644
--- a/README.md
+++ b/README.md
@@ -33,10 +33,11 @@ version is 4.3.11.
      done
      ```
 
-     Note: If you already have any of the given config files, ln will error. In
-     simple cases you can add `source "${ZDOTDIR:-$HOME}/.zprezto/init.zsh"` to
-     the bottom of your `.zshrc` to load prezto but keep your config intact. For
-     more complicated setups, it is recommended that you back up your original
+     Note: If you already have any of the given configuration files, `ln` will
+     cause error. In simple cases you can load prezto by adding the line
+     `source "${ZDOTDIR:-$HOME}/.zprezto/init.zsh"` to the bottom of your
+     `.zshrc` and keep the rest of your Zsh configuration intact. For more
+     complicated setups, it is recommended that you back up your original
      configs and replace them with the provided prezto runcoms.
 
   4. Set Zsh as your default shell:
@@ -89,6 +90,10 @@ accompanying README files to learn of what is available.
      window or tab.
 
      ![sorin theme][2]
+     Note that the 'git' module may be required for special symbols to appear,
+     such as those on the right of the above image. Add `'git'` to the `pmodule`
+     list (under `zstyle ':prezto:load' pmodule \` in your *~/.zpreztorc*) to
+     enable this module.
 
 ### External Modules
 
@@ -99,7 +104,7 @@ accompanying README files to learn of what is available.
      Note that module names need to be unique or they will cause an error when
      loading.
 
-     ```console
+     ```sh
      zstyle ':prezto:load' pmodule-dirs $HOME/.zprezto-contrib
      ```
 
@@ -126,6 +131,6 @@ This project is licensed under the MIT License.
 [3]: http://git-scm.com
 [4]: https://github.com
 [5]: http://gitimmersion.com
-[6]: http://gitref.org
+[6]: https://git.github.io/git-reference/
 [7]: http://www.bash2zsh.com/zsh_refcard/refcard.pdf
 [8]: http://grml.org/zsh/zsh-lovers.html
diff --git a/modules/README.md b/modules/README.md
index 1c2cdc54d8..1ff4e61225 100644
--- a/modules/README.md
+++ b/modules/README.md
@@ -20,7 +20,7 @@ Integrates zsh-autosuggestions into Prezto.
 Command-Not-Found
 -----------------
 
-Loads the command-not-found tool on Debian-based distributions.
+Loads the command-not-found tool on macOS or Debian-based distributions.
 
 Completion
 ----------
@@ -122,7 +122,7 @@ Initializes OCaml package management.
 OSX
 ---
 
-Defines Mac OS X aliases and functions.
+Defines macOS aliases and functions.
 
 Pacman
 ------
@@ -132,7 +132,7 @@ Provides aliases and functions for the Pacman package manager and frontends.
 Perl
 ----
 
-Enables local Perl module installation on Mac OS X and defines alises.
+Enables local Perl module installation on macOS and defines alises.
 
 Prompt
 ------
diff --git a/modules/archive/README.md b/modules/archive/README.md
index 600ff15d0e..c9806ea591 100644
--- a/modules/archive/README.md
+++ b/modules/archive/README.md
@@ -31,9 +31,9 @@ installed:
   - *.7z* requires `7za`.
   - *.deb* requires `ar`, `tar`.
 
-Additionally, if `pigz` and/or `pbzip2` are installed, `archive` will use them over
-their traditional counterparts, `gzip` and `bzip2` respectively, to take full advantage
-of all available CPU cores for compression.
+Additionally, if `pigz` and/or `pbzip2` are installed, `archive` will use them
+over their traditional counterparts, `gzip` and `bzip2` respectively, to take
+full advantage of all available CPU cores for compression.
 
 Alternatives
 ------------
diff --git a/modules/archive/functions/archive b/modules/archive/functions/archive
index 0e3bb616bf..fab409e2c0 100644
--- a/modules/archive/functions/archive
+++ b/modules/archive/functions/archive
@@ -8,11 +8,11 @@
 
 # function archive {
 
-local archive_name dir_to_archive _gzip_bin _bzip2_bin
+local archive_name path_to_archive _gzip_bin _bzip2_bin
 
-if (( $# != 2 )); then
+if (( $# < 2 )); then
   cat >&2 <<EOF
-usage: $0 [archive_name.zip] [/path/to/include/into/archive]
+usage: $0 [archive_name.zip] [/path/to/include/into/archive ...]
 
 Where 'archive.zip' uses any of the following extensions:
 
@@ -28,14 +28,8 @@ fi
 
 # strip the path, just in case one is provided for some reason
 archive_name="${1:t}"
-# use absolute paths, and follow symlinks
-dir_to_archive="${2}"
-
-# if the directory doesn't exist, quit. Nothing to archive
-if [[ ! -e "${dir_to_archive}" ]]; then
-  print "$0: file or directory not valid: ${dir_to_archive}" >&2
-  return 1
-fi
+# let paths be handled by actual archive helper
+path_to_archive="${@:2}"
 
 # here, we check for dropin/multi-threaded replacements
 # this should eventually be moved to modules/archive/init.zsh
@@ -53,14 +47,14 @@ else
 fi
 
 case "${archive_name}" in
-  (*.tar.gz|*.tgz) tar -cvf "${archive_name}" --use-compress-program="${_gzip_bin}" "${dir_to_archive}" ;;
-  (*.tar.bz2|*.tbz|*.tbz2) tar -cvf "${archive_name}" --use-compress-program="${_bzip2_bin}" "${dir_to_archive}" ;;
-  (*.tar.xz|*.txz) tar -cvJf "${archive_name}" "${dir_to_archive}" ;;
-  (*.tar.lzma|*.tlz) tar -cvf "${archive_name}" --lzma "${dir_to_archive}" ;;
-  (*.tar) tar -cvf "${archive_name}" "${dir_to_archive}" ;;
-  (*.zip|*.jar) zip -r "${archive_name}" "${dir_to_archive}" ;;
-  (*.rar) rar a "${archive_name}" "${dir_to_archive}" ;;
-  (*.7z) 7za a "${archive_name}" "${dir_to_archive}" ;;
+  (*.tar.gz|*.tgz) tar -cvf "${archive_name}" --use-compress-program="${_gzip_bin}" "${=path_to_archive}" ;;
+  (*.tar.bz2|*.tbz|*.tbz2) tar -cvf "${archive_name}" --use-compress-program="${_bzip2_bin}" "${=path_to_archive}" ;;
+  (*.tar.xz|*.txz) tar -cvJf "${archive_name}" "${=path_to_archive}" ;;
+  (*.tar.lzma|*.tlz) tar -cvf "${archive_name}" --lzma "${=path_to_archive}" ;;
+  (*.tar) tar -cvf "${archive_name}" "${=path_to_archive}" ;;
+  (*.zip|*.jar) zip -r "${archive_name}" "${=path_to_archive}" ;;
+  (*.rar) rar a "${archive_name}" "${=path_to_archive}" ;;
+  (*.7z) 7za a "${archive_name}" "${=path_to_archive}" ;;
   (*.gz) print "\n.gz is only useful for single files, and does not capture permissions. Use .tar.gz" ;;
   (*.bz2) print "\n.bzip2 is only useful for single files, and does not capture permissions. Use .tar.bz2" ;;
   (*.xz) print "\n.xz is only useful for single files, and does not capture permissions. Use .tar.xz" ;;
diff --git a/modules/autosuggestions/README.md b/modules/autosuggestions/README.md
index ad0f7eced9..48f9852887 100644
--- a/modules/autosuggestions/README.md
+++ b/modules/autosuggestions/README.md
@@ -1,8 +1,3 @@
-Autosuggestions
----------------
-
-Integrates zsh-autosuggestions into Prezto.
-
 Autosuggestions
 ===============
 
@@ -46,6 +41,14 @@ To set the query found color, add the following line to *zpreztorc*:
 zstyle ':prezto:module:autosuggestions:color' found ''
 ```
 
+Troubleshooting
+---------------
+
+### Autosuggestions from previous sessions don't show up
+
+For autosuggestions from previous shell sessions to work, please make sure you
+also have the `history` module enabled.
+
 Authors
 -------
 
diff --git a/modules/command-not-found/README.md b/modules/command-not-found/README.md
index 7775c92621..ee5a94d6d5 100644
--- a/modules/command-not-found/README.md
+++ b/modules/command-not-found/README.md
@@ -3,11 +3,12 @@ Command-Not-Found
 
 When you try to use a command that is not available locally, searches
 the package manager for a package offering that command and suggests
-the proper install command. 
+the proper install command.
 
-Debian-based and Arch Linux-based distributions use the [`command-not-found`][1] tool.
+Debian and Arch Linux based distributions use the [`command-not-found`][1] tool.
 
-macOS uses Homebrew's [`command-not-found` clone][2]. Note that you also need to [follow the instructions to tap the `command-not-found` homebrew repository][3].
+macOS uses Homebrew's [`command-not-found` clone][2]. Note that you also need to
+[follow the instructions][3] to tap the `command-not-found` homebrew repository.
 
 
 Authors
diff --git a/modules/command-not-found/init.zsh b/modules/command-not-found/init.zsh
index 0e778031f1..f3d7ea6287 100644
--- a/modules/command-not-found/init.zsh
+++ b/modules/command-not-found/init.zsh
@@ -12,9 +12,30 @@ if [[ -s '/etc/zsh_command_not_found' ]]; then
 # Load command-not-found on Arch Linux-based distributions.
 elif [[ -s '/usr/share/doc/pkgfile/command-not-found.zsh' ]]; then
   source '/usr/share/doc/pkgfile/command-not-found.zsh'
-# Load command-not-found on Mac OS X when homebrew tap is configured.
-elif (( $+commands[brew] )) && brew command command-not-found-init > /dev/null 2>&1; then
-  eval "$(brew command-not-found-init)"
+# Load command-not-found on macOS when Homebrew tap is configured.
+# To avoid performance penalty, we do not use Homebrew's ruby based command
+# lookup mechanism (viz., `brew command command-not-found-init`) and instead
+# `find` it ourselves from `TAP_DIRECTORY` defined internally in Homebrew.
+elif (( $+commands[brew] )); then
+  cnf_command=(
+    "$(brew --repository 2> /dev/null)"/Library/Taps/*/*/cmd/brew-command-not-found-init(|.rb)(.N)
+  )
+  if (( $#cnf_command )); then
+    cache_file="${TMPDIR:-/tmp}/prezto-brew-command-not-found-cache.$UID.zsh"
+
+    if [[ "${${(@o)cnf_command}[1]}" -nt "$cache_file" \
+          || "${ZDOTDIR:-$HOME}/.zpreztorc" -nt "$cache_file" \
+          || ! -s "$cache_file" ]]; then
+      # brew command-not-found-init is slow; cache its output.
+      brew command-not-found-init >! "$cache_file" 2> /dev/null
+    fi
+
+    source "$cache_file"
+
+    unset cache_file
+  fi
+
+  unset cnf_command
 # Return if requirements are not found.
 else
   return 1
diff --git a/modules/completion/README.md b/modules/completion/README.md
index 7efb3d96a8..dc2b9b837a 100644
--- a/modules/completion/README.md
+++ b/modules/completion/README.md
@@ -6,6 +6,19 @@ the [zsh-completions][1] project.
 
 This module must be loaded **after** the *utility* module.
 
+Options
+-------
+
+  - `COMPLETE_IN_WORD` complete from both ends of a word.
+  - `ALWAYS_TO_END` move cursor to the end of a completed word.
+  - `PATH_DIRS` perform path search even on command names with slashes.
+  - `AUTO_MENU` show completion menu on a successive tab press.
+  - `AUTO_LIST` automatically list choices on ambiguous completion.
+  - `AUTO_PARAM_SLASH` if completed parameter is a directory, add a trailing slash.
+  - `EXTENDED_GLOB` needed for file modification glob modifiers with compinit.
+  - `MENU_COMPLETE` do not autoselect the first completion entry.
+  - `FLOW_CONTROL` disable start/stop characters in shell editor.
+
 Settings
 --------
 
diff --git a/modules/completion/init.zsh b/modules/completion/init.zsh
index e2cc2d4472..07acf13bf3 100644
--- a/modules/completion/init.zsh
+++ b/modules/completion/init.zsh
@@ -99,7 +99,7 @@ zstyle ':completion:*:history-words' remove-all-dups yes
 zstyle ':completion:*:history-words' list false
 zstyle ':completion:*:history-words' menu yes
 
-# Environmental Variables
+# Environment Variables
 zstyle ':completion::*:(-command-|export):*' fake-parameters ${${${_comps[(I)-value-*]#*,}%%,*}:#-*-}
 
 # Populate hostname completion. But allow ignoring custom entries from static
@@ -107,7 +107,7 @@ zstyle ':completion::*:(-command-|export):*' fake-parameters ${${${_comps[(I)-va
 zstyle -a ':prezto:module:completion:*:hosts' etc-host-ignores '_etc_host_ignores'
 
 zstyle -e ':completion:*:hosts' hosts 'reply=(
-  ${=${=${=${${(f)"$(cat {/etc/ssh_,~/.ssh/known_}hosts(|2)(N) 2> /dev/null)"}%%[#| ]*}//\]:[0-9]*/ }//,/ }//\[/ }
+  ${=${=${=${${(f)"$(cat {/etc/ssh/ssh_,~/.ssh/}known_hosts(|2)(N) 2> /dev/null)"}%%[#| ]*}//\]:[0-9]*/ }//,/ }//\[/ }
   ${=${(f)"$(cat /etc/hosts(|)(N) <<(ypcat hosts 2> /dev/null))"}%%(\#${_etc_host_ignores:+|${(j:|:)~_etc_host_ignores}})*}
   ${=${${${${(@M)${(f)"$(cat ~/.ssh/config 2> /dev/null)"}:#Host *}#Host }:#*\**}:#*\?*}}
 )'
diff --git a/modules/directory/init.zsh b/modules/directory/init.zsh
index 47191dfe4f..8abc1e2407 100644
--- a/modules/directory/init.zsh
+++ b/modules/directory/init.zsh
@@ -16,7 +16,6 @@ setopt PUSHD_IGNORE_DUPS    # Do not store duplicates in the stack.
 setopt PUSHD_SILENT         # Do not print the directory stack after pushd or popd.
 setopt PUSHD_TO_HOME        # Push to home directory when no argument is given.
 setopt CDABLE_VARS          # Change directory to a path stored in a variable.
-setopt AUTO_NAME_DIRS       # Auto add variable-stored paths to ~ list.
 setopt MULTIOS              # Write to multiple descriptors.
 setopt EXTENDED_GLOB        # Use extended globbing syntax.
 unsetopt CLOBBER            # Do not overwrite existing files with > and >>.
diff --git a/modules/editor/README.md b/modules/editor/README.md
index c27e8642c0..d5280c45f5 100644
--- a/modules/editor/README.md
+++ b/modules/editor/README.md
@@ -1,7 +1,17 @@
 Editor
 ======
 
-Sets key bindings.
+Sets editor specific key bindings options and variables.
+
+Options
+-------
+
+  - `BEEP` beep on error in line editor.
+
+Variables
+---------
+
+  - `WORDCHARS` treat a given set of characters as part of a word.
 
 Settings
 --------
diff --git a/modules/editor/init.zsh b/modules/editor/init.zsh
index ed57a102fa..085947ef61 100644
--- a/modules/editor/init.zsh
+++ b/modules/editor/init.zsh
@@ -14,8 +14,7 @@ fi
 # Options
 #
 
-# Beep on error in line editor.
-setopt BEEP
+setopt BEEP                     # Beep on error in line editor.
 
 #
 # Variables
@@ -242,6 +241,27 @@ function glob-alias {
 }
 zle -N glob-alias
 
+# Toggle the comment character at the start of the line. This is meant to work
+# around a buggy implementation of pound-insert in zsh.
+#
+# This is currently only used for the emacs keys because vi-pound-insert has
+# been reported to work properly.
+function pound-toggle {
+  if [[ "$BUFFER" = '#'* ]]; then
+    # Because of an oddity in how zsh handles the cursor when the buffer size
+    # changes, we need to make this check before we modify the buffer and let
+    # zsh handle moving the cursor back if it's past the end of the line.
+    if [[ $CURSOR != $#BUFFER ]]; then
+      (( CURSOR -= 1 ))
+    fi
+    BUFFER="${BUFFER:1}"
+  else
+    BUFFER="#$BUFFER"
+    (( CURSOR += 1 ))
+  fi
+}
+zle -N pound-toggle
+
 # Reset to default key bindings.
 bindkey -d
 
@@ -277,6 +297,12 @@ if (( $+widgets[history-incremental-pattern-search-backward] )); then
     history-incremental-pattern-search-forward
 fi
 
+# Toggle comment at the start of the line. Note that we use pound-toggle which
+# is similar to pount insert, but meant to work around some issues that were
+# being seen in iTerm.
+bindkey -M emacs "$key_info[Escape];" pound-toggle
+
+
 #
 # Vi Key Bindings
 #
@@ -296,6 +322,9 @@ else
   bindkey -M vicmd "/" history-incremental-search-forward
 fi
 
+# Toggle comment at the start of the line.
+bindkey -M vicmd "#" vi-pound-insert
+
 #
 # Emacs and Vi Key Bindings
 #
diff --git a/modules/environment/README.md b/modules/environment/README.md
index b0d579bb45..15ee95922c 100644
--- a/modules/environment/README.md
+++ b/modules/environment/README.md
@@ -5,9 +5,6 @@ Sets general shell options and defines environment variables.
 
 This module must be loaded first.
 
-Environment Variables
----------------------
-
 Contributors
 ------------
 
@@ -15,6 +12,39 @@ This module **MUST NOT** rely on any command not built in Zsh.
 
 Non-interactive environment variables should be defined in [`zshenv`][1].
 
+Options
+-------
+
+### General
+
+  - `COMBINING_CHARS` combine zero-length punctuation characters (accents) with
+    the base character.
+  - `INTERACTIVE_COMMENTS` enable comments in interactive shell.
+  - `RC_QUOTES` allow 'Henry''s Garage' instead of 'Henry'\''s Garage'.
+  - `MAIL_WARNING` don't print a warning message if a mail file has been accessed.
+
+### Jobs
+
+  - `LONG_LIST_JOBS` list jobs in the long format by default.
+  - `AUTO_RESUME` attempt to resume existing job before creating a new process.
+  - `NOTIFY` report status of background jobs immediately.
+  - `BG_NICE` don't run all background jobs at a lower priority.
+  - `HUP` don't kill jobs on shell exit.
+  - `CHECK_JOBS` don't report on jobs when shell exit.
+
+Variables
+---------
+
+### Termcap
+
+  - `LESS_TERMCAP_mb` begins blinking.
+  - `LESS_TERMCAP_md` begins bold.
+  - `LESS_TERMCAP_me` ends mode.
+  - `LESS_TERMCAP_se` ends standout-mode.
+  - `LESS_TERMCAP_so` begins standout-mode.
+  - `LESS_TERMCAP_ue` ends underline.
+  - `LESS_TERMCAP_us` begins underline.
+
 Authors
 -------
 
diff --git a/modules/environment/init.zsh b/modules/environment/init.zsh
index 79e98a4a24..7ae8c4f6a6 100644
--- a/modules/environment/init.zsh
+++ b/modules/environment/init.zsh
@@ -14,7 +14,7 @@
 # paste had a regression. Additionally, 5.2 added bracketed-paste-url-magic
 # which is generally better than url-quote-magic so we load that when possible.
 autoload -Uz is-at-least
-if [[ ${ZSH_VERSION} != 5.1.1 ]]; then
+if [[ ${ZSH_VERSION} != 5.1.1 && ${TERM} != "dumb" ]]; then
   if is-at-least 5.2; then
     autoload -Uz bracketed-paste-url-magic
     zle -N bracketed-paste bracketed-paste-url-magic
@@ -32,10 +32,11 @@ fi
 # General
 #
 
-setopt COMBINING_CHARS    # Combine zero-length punctuation characters (accents)
-                          # with the base character.
-setopt RC_QUOTES          # Allow 'Henry''s Garage' instead of 'Henry'\''s Garage'.
-unsetopt MAIL_WARNING     # Don't print a warning message if a mail file has been accessed.
+setopt COMBINING_CHARS      # Combine zero-length punctuation characters (accents)
+                            # with the base character.
+setopt INTERACTIVE_COMMENTS # Enable comments in interactive shell.
+setopt RC_QUOTES            # Allow 'Henry''s Garage' instead of 'Henry'\''s Garage'.
+unsetopt MAIL_WARNING       # Don't print a warning message if a mail file has been accessed.
 
 #
 # Jobs
diff --git a/modules/fasd/init.zsh b/modules/fasd/init.zsh
index 113a8716f0..37babd8e3e 100644
--- a/modules/fasd/init.zsh
+++ b/modules/fasd/init.zsh
@@ -20,7 +20,9 @@ fi
 #
 
 cache_file="${TMPDIR:-/tmp}/prezto-fasd-cache.$UID.zsh"
-if [[ "${commands[fasd]}" -nt "$cache_file" || ! -s "$cache_file"  ]]; then
+if [[ "${commands[fasd]}" -nt "$cache_file" \
+      || "${ZDOTDIR:-$HOME}/.zpreztorc" -nt "$cache_file" \
+      || ! -s "$cache_file"  ]]; then
   # Set the base init arguments.
   init_args=(zsh-hook)
 
diff --git a/modules/git/README.md b/modules/git/README.md
index bd67f712cc..e4425fab22 100644
--- a/modules/git/README.md
+++ b/modules/git/README.md
@@ -67,7 +67,7 @@ zstyle ':prezto:module:git:alias' skip 'yes'
   - `gcm` records changes to the repository with the given message.
   - `gcS` records changes to the repository. (Signed)
   - `gcSa` stages all modified and deleted files. (Signed)
-  - `gcSm` records changes to the repository with the given message. (Signed)  - `gco`  checks out a branch or paths to work tree.
+  - `gcSm` records changes to the repository with the given message. (Signed)
   - `gcam` stages all modified and deleted files, and records changes to the repository with the given message.
   - `gco` checks out a branch or paths to work tree.
   - `gcO` checks out hunks from the index or the tree interactively.
@@ -81,7 +81,10 @@ zstyle ':prezto:module:git:alias' skip 'yes'
      commits.
   - `gcR` removes the *HEAD* commit.
   - `gcs` displays various types of objects.
+  - `gcsS` displays commits with GPG signature.
   - `gcl` lists lost commits.
+  - `gcy` displays commits yet to be applied to upstream in the short format.
+  - `gcY` displays commits yet to be applied to upstream.
 
 ### Conflict
 
@@ -218,6 +221,7 @@ zstyle ':prezto:module:git:alias' skip 'yes'
   - `glg` displays the graph log.
   - `glb` displays the brief commit log.
   - `glc` displays the commit count for each contributor in descending order.
+  - `glS` displays the log and checks the validity of signed commits.
 
 ### Merge
 
@@ -231,7 +235,8 @@ zstyle ':prezto:module:git:alias' skip 'yes'
 ### Push
 
   - `gp` updates remote refs along with associated objects.
-  - `gpf` forcefully updates remote refs along with associated objects.
+  - `gpf` forcefully updates remote refs along with associated objects using the safer `--force-with-lease` option.
+  - `gpF` forcefully updates remote refs along with associated objects using the riskier `--force` option.
   - `gpa` updates remote branches along with associated objects.
   - `gpA` updates remote branches and tags along with associated objects.
   - `gpt` updates remote tags along with associated objects.
@@ -288,6 +293,13 @@ zstyle ':prezto:module:git:alias' skip 'yes'
   - `gSu` fetches and merges the latest changes for all submodule.
   - `gSx` removes a submodule.
 
+### Tag
+
+  - `gt` lists tags or creates tag.
+  - `gtl` lists tags matching pattern.
+  - `gts` creates a signed tag.
+  - `gtv` validate a signed tag.
+
 ### Working directory
 
   - `gws` displays working-tree status in the short format.
@@ -307,9 +319,10 @@ zstyle ':prezto:module:git:alias' skip 'yes'
 
 The following aliases may shadow system commands:
 
-  - `gpt` shadows the [GUID partition table maintenance utility][4].
-  - `gs` shadows the [Ghostscript][5].
   - `gb` shadows the [GB][9].
+  - `gm` shadows the [Graphics Magick image processor][11].
+  - `gpt` shadows the [GUID partition table maintenance utility][4].
+  - `gs` shadows the [Ghostscript interpreter and previewer][5].
 
 If you frequently use the above commands, you may wish to remove said aliases
 from this module or to disable them at the bottom of the zshrc with `unalias`.
@@ -434,9 +447,10 @@ Authors
 [2]: https://github.com/defunkt/hub
 [3]: https://www.github.com
 [4]: http://www.manpagez.com/man/8/gpt/
-[5]: http://linux.die.net/man/1/gs
+[5]: http://www.manpagez.com/man/1/gs/
 [6]: https://github.com/sorin-ionescu/prezto/issues
 [7]: https://github.com/sorin-ionescu/prezto/issues/219
 [8]: http://www.kernel.org/pub/software/scm/git/docs/git-log.html
 [9]: https://getgb.io/
 [10]: https://github.com/blog/985-git-io-github-url-shortener
+[11]: http://www.manpagez.com/man/1/gm/
diff --git a/modules/git/alias.zsh b/modules/git/alias.zsh
index 4a5789fe1d..89ba558733 100644
--- a/modules/git/alias.zsh
+++ b/modules/git/alias.zsh
@@ -68,7 +68,10 @@ if ! zstyle -t ':prezto:module:git:alias' skip 'yes'; then
   alias gcr='git revert'
   alias gcR='git reset "HEAD^"'
   alias gcs='git show'
+  alias gcsS='git show --pretty=short --show-signature'
   alias gcl='git-commit-lost'
+  alias gcy='git cherry -v --abbrev'
+  alias gcY='git cherry -v'
 
   # Conflict (C)
   alias gCl='git --no-pager diff --name-only --diff-filter=U'
@@ -188,6 +191,7 @@ if ! zstyle -t ':prezto:module:git:alias' skip 'yes'; then
   alias glg='git log --topo-order --all --graph --pretty=format:"${_git_log_oneline_format}"'
   alias glb='git log --topo-order --pretty=format:"${_git_log_brief_format}"'
   alias glc='git shortlog --summary --numbered'
+  alias glS='git log --show-signature'
 
   # Merge (m)
   alias gm='git merge'
@@ -250,6 +254,12 @@ if ! zstyle -t ':prezto:module:git:alias' skip 'yes'; then
   alias gSu='git submodule foreach git pull origin master'
   alias gSx='git-submodule-remove'
 
+  # Tag (t)
+  alias gt='git tag'
+  alias gtl='git tag -l'
+  alias gts='git tag -s'
+  alias gtv='git verify-tag'
+
   # Working Copy (w)
   alias gws='git status --ignore-submodules=${_git_status_ignore_submodules} --short'
   alias gwS='git status --ignore-submodules=${_git_status_ignore_submodules}'
diff --git a/modules/git/functions/_git-hub-browse b/modules/git/functions/_git-hub-browse
index 9e6d6f0d5c..075314bb90 100644
--- a/modules/git/functions/_git-hub-browse
+++ b/modules/git/functions/_git-hub-browse
@@ -8,7 +8,7 @@
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
 #
 
-if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
   return 1
 fi
 
@@ -21,7 +21,7 @@ _arguments -C -s -S \
 
 case "$state" in
   (remote)
-    remotes=($(git config --get-regexp 'remote.*.url' | cut -d. -f2))
+    remotes=($(command git config --get-regexp 'remote.*.url' | cut -d. -f2))
 
     _describe -t branch 'remotes' remotes && ret=0
   ;;
@@ -29,7 +29,7 @@ case "$state" in
     remote="$words[(($CURRENT - 1))]"
 
     branches_or_tags=($(
-      git ls-remote --heads --tags "$remote" 2> /dev/null | cut -f2
+      command git ls-remote --heads --tags "$remote" 2> /dev/null | cut -f2
     ))
 
     branches=(HEAD ${${(M)branches_or_tags[@]##refs/heads/?##}##refs/heads/})
@@ -39,7 +39,7 @@ case "$state" in
     _describe -t tag 'tags' tags && ret=0
   ;;
   (file)
-    files=(${(0)"$(_call_program files git ls-files -z --exclude-standard 2> /dev/null)"})
+    files=(${(0)"$(_call_program files command git ls-files -z --exclude-standard 2> /dev/null)"})
     _wanted file expl 'file' _multi_parts - / files && ret=0
   ;;
 esac
diff --git a/modules/git/functions/_git-info b/modules/git/functions/_git-info
index 1e21bfeb1a..ef6d97026b 100644
--- a/modules/git/functions/_git-info
+++ b/modules/git/functions/_git-info
@@ -8,7 +8,7 @@
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
 #
 
-if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
   return 1
 fi
 
diff --git a/modules/git/functions/_git-submodule-move b/modules/git/functions/_git-submodule-move
index 44eddb5402..5f2122c4d1 100644
--- a/modules/git/functions/_git-submodule-move
+++ b/modules/git/functions/_git-submodule-move
@@ -8,7 +8,7 @@
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
 #
 
-if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
   return 1
 fi
 
@@ -25,7 +25,7 @@ case "$state" in
     while IFS=$'\n' read submodule; do
       submodules+=("$submodule")
     done < <(
-      git config --file "$(git-root)/.gitmodules" --list \
+      command git config --file "$(git-root)/.gitmodules" --list \
         | grep '.path=' \
         | cut -d= -f2-
     )
diff --git a/modules/git/functions/_git-submodule-remove b/modules/git/functions/_git-submodule-remove
index 87bd7cb006..819dfd8e36 100644
--- a/modules/git/functions/_git-submodule-remove
+++ b/modules/git/functions/_git-submodule-remove
@@ -8,7 +8,7 @@
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
 #
 
-if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
   return 1
 fi
 
@@ -18,7 +18,7 @@ local submodule
 while IFS=$'\n' read submodule; do
   submodules+=("$submodule")
 done < <(
-  git config --file "$(git-root)/.gitmodules" --list \
+  command git config --file "$(git-root)/.gitmodules" --list \
     | grep '.path=' \
     | cut -d= -f2-
 )
diff --git a/modules/git/functions/git-branch-current b/modules/git/functions/git-branch-current
index cadb6f63df..3cf2e191d1 100644
--- a/modules/git/functions/git-branch-current
+++ b/modules/git/functions/git-branch-current
@@ -7,12 +7,12 @@
 
 # function git-branch-current {
 
-if ! git rev-parse 2> /dev/null; then
+if ! command git rev-parse 2> /dev/null; then
   print "$0: not a repository: $PWD" >&2
   return 1
 fi
 
-local ref="$(git symbolic-ref HEAD 2> /dev/null)"
+local ref="$(command git symbolic-ref HEAD 2> /dev/null)"
 
 if [[ -n "$ref" ]]; then
   print "${ref#refs/heads/}"
diff --git a/modules/git/functions/git-commit-lost b/modules/git/functions/git-commit-lost
index 62789ac916..1f086d3b95 100644
--- a/modules/git/functions/git-commit-lost
+++ b/modules/git/functions/git-commit-lost
@@ -7,15 +7,15 @@
 
 # function git-commit-lost {
 
-if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
   print "$0: not a repository work tree: $PWD" >&2
   return 1
 fi
 
-git fsck 2> /dev/null \
+command git fsck 2> /dev/null \
   | grep "^dangling commit" \
   | awk '{print $3}' \
-  | git log \
+  | command git log \
       --date-order \
       --no-walk \
       --stdin \
diff --git a/modules/git/functions/git-dir b/modules/git/functions/git-dir
index fdb515c5d4..aacaaa8866 100644
--- a/modules/git/functions/git-dir
+++ b/modules/git/functions/git-dir
@@ -7,7 +7,7 @@
 
 # function git-dir {
 
-local git_dir="${$(git rev-parse --git-dir):A}"
+local git_dir="${$(command git rev-parse --git-dir):A}"
 
 if [[ -n "$git_dir" ]]; then
   print "$git_dir"
diff --git a/modules/git/functions/git-hub-browse b/modules/git/functions/git-hub-browse
index a365a5a9ae..cb3fc60de8 100644
--- a/modules/git/functions/git-hub-browse
+++ b/modules/git/functions/git-hub-browse
@@ -7,7 +7,7 @@
 
 # function git-hub-browse {
 
-if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
   print "$0: not a repository work tree: $PWD" >&2
   return 1
 fi
@@ -15,7 +15,7 @@ fi
 local remotes remote references reference file url
 
 remote="${1:-origin}"
-remotes=($(git config --get-regexp 'remote.*.url' | cut -d. -f2))
+remotes=($(command git config --get-regexp 'remote.*.url' | cut -d. -f2))
 
 if (( $remotes[(i)$remote] == $#remotes + 1 )); then
   print "$0: remote not found: $remote" >&2
@@ -23,14 +23,14 @@ if (( $remotes[(i)$remote] == $#remotes + 1 )); then
 fi
 
 url=$(
-  git config --get "remote.${remote}.url" \
+  command git config --get "remote.${remote}.url" \
     | sed -En "s/(git|https?)(@|:\/\/)github.com(:|\/)(.+)\/(.+).git/https:\/\/github.com\/\4\/\5/p"
 )
 
 reference="${${2:-$(git-branch-current)}:-HEAD}"
 references=(
   HEAD
-  ${$(git ls-remote --heads --tags "$remote" | awk '{print $2}')##refs/(heads|tags)/}
+  ${$(command git ls-remote --heads --tags "$remote" | awk '{print $2}')##refs/(heads|tags)/}
 )
 
 if (( $references[(i)$reference] == $#references + 1 )); then
@@ -39,7 +39,7 @@ if (( $references[(i)$reference] == $#references + 1 )); then
 fi
 
 if [[ "$reference" == 'HEAD' ]]; then
-  reference="$(git rev-parse HEAD 2> /dev/null)"
+  reference="$(command git rev-parse HEAD 2> /dev/null)"
 fi
 
 file="$3"
diff --git a/modules/git/functions/git-info b/modules/git/functions/git-info
index d27365c243..fe8ca2acd9 100644
--- a/modules/git/functions/git-info
+++ b/modules/git/functions/git-info
@@ -178,15 +178,15 @@ function git-info {
   typeset -gA git_info
 
   # Return if not inside a Git repository work tree.
-  if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+  if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
     return 1
   fi
 
   if (( $# > 0 )); then
     if [[ "$1" == [Oo][Nn] ]]; then
-      git config --bool prompt.showinfo true
+      command git config --bool prompt.showinfo true
     elif [[ "$1" == [Oo][Ff][Ff] ]]; then
-      git config --bool prompt.showinfo false
+      command git config --bool prompt.showinfo false
     else
       print "usage: $0 [ on | off ]" >&2
     fi
@@ -194,7 +194,7 @@ function git-info {
   fi
 
   # Return if git-info is disabled.
-  if ! is-true "${$(git config --bool prompt.showinfo):-true}"; then
+  if ! is-true "${$(command git config --bool prompt.showinfo):-true}"; then
     return 1
   fi
 
@@ -204,7 +204,7 @@ function git-info {
   # Format commit.
   zstyle -s ':prezto:module:git:info:commit' format 'commit_format'
   if [[ -n "$commit_format" ]]; then
-    commit="$(git rev-parse HEAD 2> /dev/null)"
+    commit="$(command git rev-parse HEAD 2> /dev/null)"
     if [[ -n "$commit" ]]; then
       zformat -f commit_formatted "$commit_format" "c:$commit"
     fi
@@ -212,10 +212,17 @@ function git-info {
 
   # Format stashed.
   zstyle -s ':prezto:module:git:info:stashed' format 'stashed_format'
-  if [[ -n "$stashed_format" && -f "$(git-dir)/refs/stash" ]]; then
-    stashed="$(git stash list 2> /dev/null | wc -l | awk '{print $1}')"
-    if [[ -n "$stashed" ]]; then
-      zformat -f stashed_formatted "$stashed_format" "S:$stashed"
+  if [[ -n "$stashed_format" ]]; then
+    commondir=""
+    if [[ -f "$(git-dir)/commondir" ]]; then
+      commondir="$(<$(git-dir)/commondir)"
+      [[ "$commondir" =~ ^/ ]] || commondir="$(git-dir)/$commondir"
+    fi
+    if [[ -f "$(git-dir)/refs/stash" || ( -n "$commondir" && -f "$commondir/refs/stash" ) ]]; then
+      stashed="$(command git stash list 2> /dev/null | wc -l | awk '{print $1}')"
+      if [[ -n "$stashed" ]]; then
+        zformat -f stashed_formatted "$stashed_format" "S:$stashed"
+      fi
     fi
   fi
 
@@ -229,7 +236,7 @@ function git-info {
   fi
 
   # Get the branch.
-  branch="${$(git symbolic-ref HEAD 2> /dev/null)#refs/heads/}"
+  branch="${$(command git symbolic-ref HEAD 2> /dev/null)#refs/heads/}"
 
   # Format branch.
   zstyle -s ':prezto:module:git:info:branch' format 'branch_format'
@@ -240,7 +247,7 @@ function git-info {
   # Format position.
   zstyle -s ':prezto:module:git:info:position' format 'position_format'
   if [[ -z "$branch" && -n "$position_format" ]]; then
-    position="$(git describe --contains --all HEAD 2> /dev/null)"
+    position="$(command git describe --contains --all HEAD 2> /dev/null)"
     if [[ -n "$position" ]]; then
       zformat -f position_formatted "$position_format" "p:$position"
     fi
@@ -250,7 +257,7 @@ function git-info {
   zstyle -s ':prezto:module:git:info:remote' format 'remote_format'
   if [[ -n "$branch" && -n "$remote_format" ]]; then
     # Gets the remote name.
-    remote_cmd='git rev-parse --symbolic-full-name --verify HEAD@{upstream}'
+    remote_cmd='command git rev-parse --symbolic-full-name --verify HEAD@{upstream}'
     remote="${$(${(z)remote_cmd} 2> /dev/null)##refs/remotes/}"
     if [[ -n "$remote" ]]; then
       zformat -f remote_formatted "$remote_format" "R:$remote"
@@ -261,7 +268,7 @@ function git-info {
   zstyle -s ':prezto:module:git:info:behind' format 'behind_format'
   if [[ -n "$branch" && ( -n "$ahead_format" || -n "$behind_format" ) ]]; then
     # Gets the commit difference counts between local and remote.
-    ahead_and_behind_cmd='git rev-list --count --left-right HEAD...@{upstream}'
+    ahead_and_behind_cmd='command git rev-list --count --left-right HEAD...@{upstream}'
 
     # Get ahead and behind counts.
     ahead_and_behind="$(${(z)ahead_and_behind_cmd} 2> /dev/null)"
@@ -290,7 +297,7 @@ function git-info {
     if [[ -n "$indexed_format" ]]; then
       ((
         indexed+=$(
-          git diff-index \
+          command git diff-index \
             --no-ext-diff \
             --name-only \
             --cached \
@@ -310,7 +317,7 @@ function git-info {
     if [[ -n "$unindexed_format" ]]; then
       ((
         unindexed+=$(
-          git diff-files \
+          command git diff-files \
             --no-ext-diff \
             --name-only \
             --ignore-submodules=${ignore_submodules:-none} \
@@ -328,7 +335,7 @@ function git-info {
     if [[ -n "$untracked_format" ]]; then
       ((
         untracked+=$(
-          git ls-files \
+          command git ls-files \
             --other \
             --exclude-standard \
             2> /dev/null \
@@ -343,7 +350,7 @@ function git-info {
     (( dirty = indexed + unindexed + untracked ))
   else
     # Use porcelain status for easy parsing.
-    status_cmd="git status --porcelain --ignore-submodules=${ignore_submodules:-none}"
+    status_cmd="command git status --porcelain --ignore-submodules=${ignore_submodules:-none}"
 
     # Get current status.
     while IFS=$'\n' read line; do
diff --git a/modules/git/functions/git-root b/modules/git/functions/git-root
index f749457205..643f346b36 100644
--- a/modules/git/functions/git-root
+++ b/modules/git/functions/git-root
@@ -7,7 +7,7 @@
 
 # function git-root {
 
-local root="$(git rev-parse --show-toplevel 2> /dev/null)"
+local root="$(command git rev-parse --show-toplevel 2> /dev/null)"
 
 if [[ -n "$root" ]]; then
   print "$root"
diff --git a/modules/git/functions/git-stash-clear-interactive b/modules/git/functions/git-stash-clear-interactive
index 71468aa0e0..cc665a1829 100644
--- a/modules/git/functions/git-stash-clear-interactive
+++ b/modules/git/functions/git-stash-clear-interactive
@@ -7,7 +7,7 @@
 
 # function git-stash-clear-interactive {
 
-if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
   print "$0: not a repository work tree: $PWD" >&2
   return 1
 fi
@@ -15,10 +15,10 @@ fi
 local stashed
 
 if [[ -f "$(git-dir)/refs/stash" ]]; then
-  stashed="$(git stash list 2> /dev/null | wc -l | awk '{print $1}')"
+  stashed="$(command git stash list 2> /dev/null | wc -l | awk '{print $1}')"
   if (( $stashed > 0 )); then
     if read -q "?Clear $stashed stashed state(s) [y/N]? "; then
-      git stash clear
+      command git stash clear
     fi
   fi
 fi
diff --git a/modules/git/functions/git-stash-dropped b/modules/git/functions/git-stash-dropped
index 2a0b7a94e7..d9e759e872 100644
--- a/modules/git/functions/git-stash-dropped
+++ b/modules/git/functions/git-stash-dropped
@@ -7,15 +7,15 @@
 
 # function git-stash-dropped {
 
-if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
   print "$0: not a repository work tree: $PWD" >&2
   return 1
 fi
 
-git fsck --unreachable 2> /dev/null \
+command git fsck --unreachable 2> /dev/null \
   | grep 'commit' \
   | awk '{print $3}' \
-  | git log \
+  | command git log \
       --pretty=format:${_git_log_oneline_format} \
       --extended-regexp \
       --grep="${1:-(WIP )?[Oo]n [^:]+:}" \
diff --git a/modules/git/functions/git-stash-recover b/modules/git/functions/git-stash-recover
index 5cc949a730..6cb5416e6c 100644
--- a/modules/git/functions/git-stash-recover
+++ b/modules/git/functions/git-stash-recover
@@ -7,7 +7,7 @@
 
 # function git-stash-recover {
 
-if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
   print "$0: not a repository work tree: $PWD" >&2
   return 1
 fi
@@ -15,8 +15,8 @@ fi
 local commit
 
 for commit in "$@"; do
-  git update-ref \
-    -m "$(git log -1 --pretty="format:%s" "$commit")" refs/stash "$commit"
+  command git update-ref \
+    -m "$(command git log -1 --pretty="format:%s" "$commit")" refs/stash "$commit"
 done
 
 # }
diff --git a/modules/git/functions/git-submodule-move b/modules/git/functions/git-submodule-move
index ec6048e68e..746f46e512 100644
--- a/modules/git/functions/git-submodule-move
+++ b/modules/git/functions/git-submodule-move
@@ -7,7 +7,7 @@
 
 # function git-submodule-move {
 
-if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
   print "$0: not a repository work tree: $PWD" >&2
   return 1
 elif [[ "$PWD" != "$(git-root)" ]]; then
@@ -19,7 +19,7 @@ local src="$1"
 local dst="$2"
 local url
 
-url="$(git config --file "$(git-root)/.gitmodules" --get "submodule.${src}.url")"
+url="$(command git config --file "$(git-root)/.gitmodules" --get "submodule.${src}.url")"
 
 if [[ -z "$url" ]]; then
   print "$0: submodule not found: $src" >&2
@@ -29,7 +29,7 @@ fi
 mkdir -p "${dst:h}"
 
 git-submodule-remove "$src"
-git submodule add "$url" "$dst"
+command git submodule add "$url" "$dst"
 
 return 0
 
diff --git a/modules/git/functions/git-submodule-remove b/modules/git/functions/git-submodule-remove
index 2490e78c87..c8c11aa8c3 100644
--- a/modules/git/functions/git-submodule-remove
+++ b/modules/git/functions/git-submodule-remove
@@ -7,22 +7,22 @@
 
 # function git-submodule-remove {
 
-if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
   print "$0: not a repository work tree: $PWD" >&2
   return 1
 elif [[ "$PWD" != "$(git-root)" ]]; then
   print "$0: must be run from the root of the work tree" >&2
   return 1
-elif ! git config --file .gitmodules --get "submodule.${1}.path" &>/dev/null; then
+elif ! command git config --file .gitmodules --get "submodule.${1}.path" &> /dev/null; then
   print "$0: submodule not found: $1" >&2
   return 1
 fi
 
-git config --file "$(git-dir)/config" --remove-section "submodule.${1}" &>/dev/null
-git config --file "$(git-root)/.gitmodules" --remove-section "submodule.${1}" &>/dev/null
-git add .gitmodules
+command git config --file "$(git-dir)/config" --remove-section "submodule.${1}" &> /dev/null
+command git config --file "$(git-root)/.gitmodules" --remove-section "submodule.${1}" &> /dev/null
+command git add .gitmodules
 
-git rm --cached -rf "${1}"
+command git rm --cached -rf "${1}"
 rm -rf "${1}"
 rm -rf "$(git-dir)/modules/${1}"
 
diff --git a/modules/gnu-utility/init.zsh b/modules/gnu-utility/init.zsh
index cbf9a4baa8..4675a3ca56 100644
--- a/modules/gnu-utility/init.zsh
+++ b/modules/gnu-utility/init.zsh
@@ -15,16 +15,16 @@ fi
 
 _gnu_utility_cmds=(
   # Coreutils
-  '[' 'base64' 'basename' 'cat' 'chcon' 'chgrp' 'chmod' 'chown'
+  '[' 'b2sum' 'base32' 'base64' 'basename' 'cat' 'chcon' 'chgrp' 'chmod' 'chown'
   'chroot' 'cksum' 'comm' 'cp' 'csplit' 'cut' 'date' 'dd' 'df'
   'dir' 'dircolors' 'dirname' 'du' 'echo' 'env' 'expand' 'expr'
   'factor' 'false' 'fmt' 'fold' 'groups' 'head' 'hostid' 'id'
-  'install' 'join' 'kill' 'link' 'ln' 'logname' 'ls' 'md5sum'
-  'mkdir' 'mkfifo' 'mknod' 'mktemp' 'mv' 'nice' 'nl' 'nohup' 'nproc'
-  'od' 'paste' 'pathchk' 'pinee' 'pr' 'printenv' 'printf' 'ptx'
+  'install' 'join' 'kill' 'link' 'ln' 'logname' 'ls' 'md5sum' 'mkdir'
+  'mkfifo' 'mknod' 'mktemp' 'mv' 'nice' 'nl' 'nohup' 'nproc'
+  'numfmt' 'od' 'paste' 'pathchk' 'pinky' 'pr' 'printenv' 'printf' 'ptx'
   'pwd' 'readlink' 'realpath' 'rm' 'rmdir' 'runcon' 'seq' 'sha1sum'
   'sha224sum' 'sha256sum' 'sha384sum' 'sha512sum' 'shred' 'shuf'
-  'sleep' 'sort' 'split' 'stat' 'stty' 'sum' 'sync' 'tac' 'tail'
+  'sleep' 'sort' 'split' 'stat' 'stdbuf' 'stty' 'sum' 'sync' 'tac' 'tail'
   'tee' 'test' 'timeout' 'touch' 'tr' 'true' 'truncate' 'tsort'
   'tty' 'uname' 'unexpand' 'uniq' 'unlink' 'uptime' 'users' 'vdir'
   'wc' 'who' 'whoami' 'yes'
diff --git a/modules/history/README.md b/modules/history/README.md
index 3dc9a26423..d020688a56 100644
--- a/modules/history/README.md
+++ b/modules/history/README.md
@@ -3,13 +3,6 @@ History
 
 Sets [history][1] options and defines history aliases.
 
-Variables
----------
-
-  - `HISTFILE` stores the path to the history file.
-  - `HISTSIZE` stores the maximum number of events to save in the internal history.
-  - `SAVEHIST` stores the maximum number of events to save in the history file.
-
 Options
 -------
 
@@ -26,6 +19,13 @@ Options
   - `HIST_VERIFY` does not execute immediately upon history expansion.
   - `HIST_BEEP` beeps when accessing non-existent history.
 
+Variables
+---------
+
+  - `HISTFILE` stores the path to the history file.
+  - `HISTSIZE` stores the maximum number of events to save in the internal history.
+  - `SAVEHIST` stores the maximum number of events to save in the history file.
+
 Aliases
 -------
 
diff --git a/modules/history/init.zsh b/modules/history/init.zsh
index 31db4c5b3a..db357b0259 100644
--- a/modules/history/init.zsh
+++ b/modules/history/init.zsh
@@ -6,14 +6,6 @@
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
 #
 
-#
-# Variables
-#
-
-HISTFILE="${ZDOTDIR:-$HOME}/.zhistory"       # The path to the history file.
-HISTSIZE=10000                   # The maximum number of events to save in the internal history.
-SAVEHIST=10000                   # The maximum number of events to save in the history file.
-
 #
 # Options
 #
@@ -31,6 +23,14 @@ setopt HIST_SAVE_NO_DUPS         # Do not write a duplicate event to the history
 setopt HIST_VERIFY               # Do not execute immediately upon history expansion.
 setopt HIST_BEEP                 # Beep when accessing non-existent history.
 
+#
+# Variables
+#
+
+HISTFILE="${ZDOTDIR:-$HOME}/.zhistory"  # The path to the history file.
+HISTSIZE=10000                   # The maximum number of events to save in the internal history.
+SAVEHIST=10000                   # The maximum number of events to save in the history file.
+
 #
 # Aliases
 #
diff --git a/modules/homebrew/README.md b/modules/homebrew/README.md
index 98a3444c19..2a37553d15 100644
--- a/modules/homebrew/README.md
+++ b/modules/homebrew/README.md
@@ -1,7 +1,16 @@
 Homebrew
 ========
 
-Defines Homebrew aliases.
+Defines Homebrew specific environment variables and aliases.
+
+Variables
+---------
+
+Execute the following to list the environment variables loaded in the shell:
+
+```sh
+brew shellenv
+```
 
 Aliases
 -------
@@ -20,12 +29,9 @@ Aliases
 ### Homebrew Cask
 
   - `cask` is aliased to `brew cask`.
-  - `caskc` cleans up old cached downloads.
-  - `caskC` cleans up all cached downloads.
   - `caski` installs a cask.
   - `caskl` lists installed casks.
   - `casko` lists casks which have an update available.
-  - `casks` searches for a cask.
   - `caskx` uninstalls a cask.
 
 Authors
diff --git a/modules/homebrew/init.zsh b/modules/homebrew/init.zsh
index e517c0a5e0..056f1fb5db 100644
--- a/modules/homebrew/init.zsh
+++ b/modules/homebrew/init.zsh
@@ -10,6 +10,17 @@ if [[ "$OSTYPE" != (darwin|linux)* ]]; then
   return 1
 fi
 
+#
+# Variables
+#
+
+# Load standard Homebrew shellenv into the shell session. 
+# Load 'HOMEBREW_' prefixed variables only. Avoid loading 'PATH' related
+# variables as they are already handled in standard zsh configuration.
+if (( $+commands[brew] )); then
+  eval "${(@M)${(f)"$(brew shellenv 2> /dev/null)"}:#export HOMEBREW*}"
+fi
+
 #
 # Aliases
 #
@@ -21,15 +32,25 @@ alias brewi='brew install'
 alias brewl='brew list'
 alias brewo='brew outdated'
 alias brews='brew search'
-alias brewu='brew update && brew upgrade'
-alias brewx='brew remove'
+alias brewu='brew upgrade'
+alias brewx='brew uninstall'
 
 # Homebrew Cask
 alias cask='brew cask'
-alias caskc='brew cask cleanup --outdated'
-alias caskC='brew cask cleanup'
+alias caskc='hb_deprecated brew cask cleanup'
+alias caskC='hb_deprecated brew cask cleanup'
 alias caski='brew cask install'
 alias caskl='brew cask list'
 alias casko='brew cask outdated'
-alias casks='brew cask search'
+alias casks='hb_deprecated brew cask search'
 alias caskx='brew cask uninstall'
+
+function hb_deprecated {
+  local cmd="${@[3]}"
+  local cmd_args="${@:4}"
+
+  printf "'brew cask %s' has been deprecated, " "${cmd}"
+  printf "using 'brew %s' instead\n" "${cmd}"
+
+  command brew "${cmd}" "${=cmd_args}"
+}
diff --git a/modules/node/functions/node-info b/modules/node/functions/node-info
index 22ac31bd5c..9feca3e16e 100644
--- a/modules/node/functions/node-info
+++ b/modules/node/functions/node-info
@@ -19,6 +19,8 @@ if (( $+functions[nvm_version] )); then
   version="${$(nvm_version)#v}"
 elif (( $+commands[nodenv] )); then
   version="${${$(nodenv version)#v}[(w)0]}"
+elif (( $+commands[node] )) ; then
+  version="${$(node -v)#v}"  
 fi
 
 if [[ "$version" != (none|) ]]; then
diff --git a/modules/node/init.zsh b/modules/node/init.zsh
index 578c642436..f452ec5a53 100644
--- a/modules/node/init.zsh
+++ b/modules/node/init.zsh
@@ -11,8 +11,10 @@ if [[ -s "$HOME/.nvm/nvm.sh" ]]; then
   source "$HOME/.nvm/nvm.sh"
 
 # Load package manager installed NVM into the shell session.
-elif (( $+commands[brew] )) && [[ -d "$(brew --prefix nvm 2> /dev/null)" ]]; then
+elif (( $+commands[brew] )) && \
+  [[ -d "${nvm_prefix::="$(brew --prefix 2> /dev/null)"/opt/nvm}" ]]; then
   source "$(brew --prefix nvm)/nvm.sh"
+  unset nvm_prefix
 
 # Load manually installed nodenv into the shell session.
 elif [[ -s "$HOME/.nodenv/bin/nodenv" ]]; then
@@ -28,16 +30,28 @@ elif (( ! $+commands[node] )); then
   return 1
 fi
 
-# Load NPM completion.
-if (( $+commands[npm] )); then
-  cache_file="${TMPDIR:-/tmp}/prezto-node-cache.$UID.zsh"
+# Load NPM and known helper completions.
+typeset -A compl_commands=(
+  npm   'npm completion'
+  grunt 'grunt --completion=zsh'
+  gupl  'gulp --completion=zsh'
+)
 
-  if [[ "$commands[npm]" -nt "$cache_file" || ! -s "$cache_file" ]]; then
-    # npm is slow; cache its output.
-    npm completion >! "$cache_file" 2> /dev/null
-  fi
+for compl_command in "${(k)compl_commands[@]}"; do
+  if (( $+commands[$compl_command] )); then
+    cache_file="${TMPDIR:-/tmp}/prezto-$compl_command-cache.$UID.zsh"
 
-  source "$cache_file"
+    # Completion commands are slow; cache their output if old or missing.
+    if [[ "$commands[$compl_command]" -nt "$cache_file" \
+          || "${ZDOTDIR:-$HOME}/.zpreztorc" -nt "$cache_file" \
+          || ! -s "$cache_file" ]]; then
+      command ${=compl_commands[$compl_command]} >! "$cache_file" 2> /dev/null
+    fi
 
-  unset cache_file
-fi
+    source "$cache_file"
+
+    unset cache_file
+  fi
+done
+
+unset compl_command{s,}
diff --git a/modules/osx/README.md b/modules/osx/README.md
index 870b486408..1f93a2c332 100644
--- a/modules/osx/README.md
+++ b/modules/osx/README.md
@@ -1,7 +1,7 @@
 OSX
 ===
 
-Defines [Mac OS X][1] aliases and functions.
+Defines [macOS][1] aliases and functions.
 
 Settings
 --------
@@ -34,8 +34,8 @@ Functions
   - `tab` creates a new tab (works in both _Terminal_ and [_iTerm_][3]).
   - `ql` previews files in Quick Look.
   - `osx-rm-dir-metadata` deletes .DS\_Store, \_\_MACOSX cruft.
-  - `osx-ls-download-history` displays the Mac OS X download history.
-  - `osx-rm-download-history` deletes the Mac OS X download history.
+  - `osx-ls-download-history` displays the macOS download history.
+  - `osx-rm-download-history` deletes the macOS download history.
 
 Authors
 -------
diff --git a/modules/osx/functions/osx-ls-download-history b/modules/osx/functions/osx-ls-download-history
index ba6a40c7ea..8b6eaab260 100644
--- a/modules/osx/functions/osx-ls-download-history
+++ b/modules/osx/functions/osx-ls-download-history
@@ -1,5 +1,5 @@
 #
-# Displays the Mac OS X download history.
+# Displays the macOS download history.
 #
 # Authors:
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
diff --git a/modules/osx/functions/osx-rm-download-history b/modules/osx/functions/osx-rm-download-history
index c6a368cafb..068ba3db93 100644
--- a/modules/osx/functions/osx-rm-download-history
+++ b/modules/osx/functions/osx-rm-download-history
@@ -1,5 +1,5 @@
 #
-# Deletes the Mac OS X download history.
+# Deletes the macOS download history.
 #
 # Authors:
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
diff --git a/modules/osx/init.zsh b/modules/osx/init.zsh
index edf6ed3d5f..f7871ca718 100644
--- a/modules/osx/init.zsh
+++ b/modules/osx/init.zsh
@@ -1,5 +1,5 @@
 #
-# Defines Mac OS X aliases and functions.
+# Defines macOS aliases and functions.
 #
 # Authors:
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
diff --git a/modules/pacman/README.md b/modules/pacman/README.md
index 855c8efad3..a619a74777 100644
--- a/modules/pacman/README.md
+++ b/modules/pacman/README.md
@@ -8,23 +8,20 @@ Settings
 --------
 
 It is possible to use a Pacman frontend with the pacman aliases provided by this
-package as long as that frontend supports the same command line options (Such as
-[Pacaur][2] or [Yaourt][3]).
+package as long as that frontend supports the same command line options (The
+[AUR Helpers][2] page has a good comparison which lists if the command line
+options are pacman compatible).
 
-To enable a Pacman frontend, for example, [Pacaur][2], add the following line to
-*zpreztorc*:
+Please note that installing packages with an AUR Helper is not officially
+supported by Archlinux. It is currently recommended to manually build AUR
+packages using the [provided instructions][3]. The [aurutils][4] project has a
+set of small utilities to make this easier.
 
-```sh
-zstyle ':prezto:module:pacman' frontend 'pacaur'
-```
-
-If you have enabled color globally in *zpreztorc*, you may disable it for certain
-commands.
-
-To disable `yaourt` highlighting, add the following line to *zpreztorc*:
+To enable a Pacman frontend, add the following line to *zpreztorc*, substituting
+`pacman_frontend` with the name of the frontent:
 
 ```sh
-zstyle ':prezto:module:pacman:yaourt' color 'no'
+zstyle ':prezto:module:pacman' frontend 'pacman_frontend'
 ```
 
 Aliases
@@ -50,28 +47,23 @@ Aliases
 
 ### Frontends
 
-#### Yaourt
-
-Note that there are currently potential security concerns relating to yaourt, so
-other frontends are recommended.
-
-  - `pacc` manages *.pac\** files.
-
 Functions
 ---------
 
+  - `aurget` clone an aur package
   - `pacman-list-explicit` lists explicitly installed pacman packages.
   - `pacman-list-disowned` lists pacman disowned files.
 
 Authors
 -------
 
-*The authors of this module should be contacted via the [issue tracker][4].*
+*The authors of this module should be contacted via the [issue tracker][5].*
 
   - [Benjamin Boudreau](https://github.com/dreur)
   - [Sorin Ionescu](https://github.com/sorin-ionescu)
 
 [1]: http://www.archlinux.org/pacman/
-[2]: https://github.com/rmarquis/pacaur
-[3]: http://archlinux.fr/yaourt-en
-[4]: https://github.com/sorin-ionescu/prezto/issues
+[2]: https://wiki.archlinux.org/index.php/AUR_helpers#Comparison_table
+[3]: https://wiki.archlinux.org/index.php/Arch_User_Repository#Installing_packages
+[4]: https://github.com/AladW/aurutils
+[5]: https://github.com/sorin-ionescu/prezto/issues
diff --git a/modules/pacman/init.zsh b/modules/pacman/init.zsh
index a5cacf2c44..88c977f6b3 100644
--- a/modules/pacman/init.zsh
+++ b/modules/pacman/init.zsh
@@ -23,10 +23,6 @@ zstyle -s ':prezto:module:pacman' frontend '_pacman_frontend'
 
 if (( $+commands[$_pacman_frontend] )); then
   alias pacman="$_pacman_frontend"
-
-  if [[ -s "${0:h}/${_pacman_frontend}.zsh" ]]; then
-    source "${0:h}/${_pacman_frontend}.zsh"
-  fi
 else
   _pacman_frontend='pacman'
   _pacman_sudo='sudo '
@@ -81,4 +77,12 @@ fi
 # upgrades outdated packages.
 alias pacU="${_pacman_sudo}${_pacman_frontend} --sync --refresh --sysupgrade"
 
+function aurget {
+  local target_dir="$1"
+  if [[ -n "$2" ]]; then
+    target_dir="$2"
+  fi
+  git clone "https://aur.archlinux.org/$1" "$target_dir"
+}
+
 unset _pacman_{frontend,sudo}
diff --git a/modules/pacman/yaourt.zsh b/modules/pacman/yaourt.zsh
deleted file mode 100644
index 819fad16be..0000000000
--- a/modules/pacman/yaourt.zsh
+++ /dev/null
@@ -1,18 +0,0 @@
-#
-# Defines Yaourt aliases.
-#
-# Authors:
-#   Sorin Ionescu <sorin.ionescu@gmail.com>
-#
-
-#
-# Aliases
-#
-
-# Disable color.
-if ! zstyle -t ':prezto:module:pacman:yaourt' color; then
-  alias pacman='yaourt --nocolor'
-fi
-
-# Manages .pac* files.
-alias pacc='yaourt -C'
diff --git a/modules/perl/README.md b/modules/perl/README.md
index 092c922478..67f2a17798 100644
--- a/modules/perl/README.md
+++ b/modules/perl/README.md
@@ -1,14 +1,14 @@
 Perl
 ====
 
-Enables local [Perl][1] module installation on Mac OS X and defines aliases.
+Enables local [Perl][1] module installation on macOS and defines aliases.
 
 Local Module Installation
 -------------------------
 
 Perl versions older than 5.14 do not support the local installation of Perl
 modules natively. This module allows for local installation of Perl modules on
-Mac OS X in *~/Library/Perl/5.12* by altering the environment.
+macOS in *~/Library/Perl/5.12* by altering the environment.
 
 ### Usage
 
diff --git a/modules/perl/init.zsh b/modules/perl/init.zsh
index ffd5f0dfd8..b7a794797a 100644
--- a/modules/perl/init.zsh
+++ b/modules/perl/init.zsh
@@ -1,5 +1,5 @@
 #
-# Enables local Perl module installation on Mac OS X and defines aliases.
+# Enables local Perl module installation on macOS and defines aliases.
 #
 # Authors:
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
@@ -43,7 +43,7 @@ if [[ "$OSTYPE" == darwin* ]]; then
   perl_path="$HOME/Library/Perl/5.12"
 
   if [[ -f "$perl_path/lib/perl5/local/lib.pm" ]]; then
-    if [[ ! -s "$cache_file" ]]; then
+    if [[ "${ZDOTDIR:-$HOME}/.zpreztorc" -nt "$cache_file" || ! -s "$cache_file" ]]; then
       perl -I$perl_path/lib/perl5 -Mlocal::lib=$perl_path >! "$cache_file"
     fi
 
diff --git a/modules/prompt/functions/prompt_minimal_setup b/modules/prompt/functions/prompt_minimal_setup
index 7456ffdb1d..b600768bd0 100644
--- a/modules/prompt/functions/prompt_minimal_setup
+++ b/modules/prompt/functions/prompt_minimal_setup
@@ -47,4 +47,13 @@ function prompt_minimal_setup {
   RPROMPT=''
 }
 
+function prompt_minimal_preview {
+  local +h PROMPT=''
+  local +h RPROMPT=''
+  local +h SPROMPT=''
+
+  editor-info 2> /dev/null
+  prompt_preview_theme 'minimal'
+}
+
 prompt_minimal_setup "$@"
diff --git a/modules/prompt/functions/prompt_smiley_setup b/modules/prompt/functions/prompt_smiley_setup
index 3066a2dc2b..3d41b3af46 100644
--- a/modules/prompt/functions/prompt_smiley_setup
+++ b/modules/prompt/functions/prompt_smiley_setup
@@ -36,7 +36,7 @@ function prompt_smiley_precmd {
 
 function prompt_smiley_setup {
   unsetopt XTRACE KSH_ARRAYS
-  prompt_opts=(percent subst)
+  prompt_opts=(cr percent sp subst)
 
   # Add hook for calling git-info before each command.
   add-zsh-hook precmd prompt_smiley_precmd
diff --git a/modules/prompt/functions/prompt_sorin_setup b/modules/prompt/functions/prompt_sorin_setup
index 30e71a9285..14f8858c1c 100644
--- a/modules/prompt/functions/prompt_sorin_setup
+++ b/modules/prompt/functions/prompt_sorin_setup
@@ -144,16 +144,17 @@ function prompt_sorin_setup {
   zstyle ':prezto:module:git:info:keys' format \
     'status' '%b %p %c:%s%A%B%S%a%d%m%r%U%u'
 
+  # Set python-info parameters.
+  zstyle ':prezto:module:python:info:virtualenv' format '%f%F{3}(%v)%F{7} '
+
   # Set up non-zero return value display
   local show_return="✘ "
   # Default is to show the return value
   if zstyle -T ':prezto:module:prompt' show-return-val; then
     show_return+='%? '
   fi
-  # Set python-info format
-  zstyle ':prezto:module:python:info:virtualenv' format '%f%F{3}(%v)%F{7} '
 
-  # Get the async worker set up
+  # Get the async worker set up.
   _sorin_cur_git_root=''
 
   _prompt_sorin_git=''
diff --git a/modules/prompt/functions/prompt_steeef_setup b/modules/prompt/functions/prompt_steeef_setup
index b241f9aa35..ca39f9321d 100644
--- a/modules/prompt/functions/prompt_steeef_setup
+++ b/modules/prompt/functions/prompt_steeef_setup
@@ -72,6 +72,9 @@ function prompt_steeef_setup {
   local unstaged_format="${_prompt_steeef_colors[2]}●%f"
   local staged_format="${_prompt_steeef_colors[5]}●%f"
 
+  # Set editor-info parameters.
+  zstyle ':prezto:module:editor:info:keymap:primary' format '$'
+
   # Set vcs_info parameters.
   zstyle ':vcs_info:*' enable bzr git hg svn
   zstyle ':vcs_info:*:prompt:*' check-for-changes true
@@ -87,8 +90,17 @@ function prompt_steeef_setup {
   # Define prompts.
   PROMPT="
 ${_prompt_steeef_colors[3]}%n%f at ${_prompt_steeef_colors[2]}%m%f in ${_prompt_steeef_colors[5]}%~%f "'${vcs_info_msg_0_}'"
-"'$python_info[virtualenv]'"$ "
+"'$python_info[virtualenv]${editor_info[keymap]} '
   RPROMPT=''
 }
 
+function prompt_steeef_preview {
+  local +h PROMPT=''
+  local +h RPROMPT=''
+  local +h SPROMPT=''
+
+  editor-info 2> /dev/null
+  prompt_preview_theme 'steeef'
+}
+
 prompt_steeef_setup "$@"
diff --git a/modules/python/README.md b/modules/python/README.md
index e7b72c480b..121ea37395 100644
--- a/modules/python/README.md
+++ b/modules/python/README.md
@@ -6,7 +6,9 @@ Enables local Python and local Python package installation.
 Settings
 --------
 
-This module supports virtual environments from conda and virtualenvwrapper. By default, only virtualenvwrapper is enabled. To disable virtualenvwrapper, add the following to *zpreztorc*.
+This module supports virtual environments from conda and virtualenvwrapper. By
+default, only virtualenvwrapper is enabled. To disable virtualenvwrapper, add
+the following to *zpreztorc*.
 
 ```sh
 zstyle ':prezto:module:python' skip-virtualenvwrapper-init 'on'
@@ -52,8 +54,8 @@ virtualenvwrapper
 
 [`virtualenvwrapper`][2] is a frontend to the popular [`virtualenv`][3] utility.
 
-`virtualenv` creates isolated Python environments and `virtualenvwrapper` provides
-convenient shell functions to create, switch, and manage them.
+`virtualenv` creates isolated Python environments and `virtualenvwrapper`
+provides convenient shell functions to create, switch, and manage them.
 
 ### Usage
 
diff --git a/modules/python/init.zsh b/modules/python/init.zsh
index 94eeab7987..44043f1c35 100644
--- a/modules/python/init.zsh
+++ b/modules/python/init.zsh
@@ -7,19 +7,22 @@
 #   Patrick Bos <egpbos@gmail.com>
 #
 
-# Load manually installed pyenv into the shell session.
-if [[ -s "$HOME/.pyenv/bin/pyenv" ]]; then
+# Load manually installed pyenv into the path
+if [[ -n "$PYENV_ROOT" && -s "$PYENV_ROOT/bin/pyenv" ]]; then
+  path=("$PYENV_ROOT/bin" $path)
+elif [[ -s "$HOME/.pyenv/bin/pyenv" ]]; then
   path=("$HOME/.pyenv/bin" $path)
-  export PYENV_ROOT=$(pyenv root)
-  eval "$(pyenv init -)"
+fi
 
-# Load package manager installed pyenv into the shell session.
-elif (( $+commands[pyenv] )); then
-  export PYENV_ROOT=$(pyenv root)
-  eval "$(pyenv init -)"
+# Load pyenv into the current python session
+if (( $+commands[pyenv] )); then
+  if [[ -z "$PYENV_ROOT" ]]; then
+    export PYENV_ROOT=$(pyenv root)
+  fi
+  eval "$(pyenv init - --no-rehash zsh)"
 
 # Prepend PEP 370 per user site packages directory, which defaults to
-# ~/Library/Python on Mac OS X and ~/.local elsewhere, to PATH. The
+# ~/Library/Python on macOS and ~/.local elsewhere, to PATH. The
 # path can be overridden using PYTHONUSERBASE.
 else
   if [[ -n "$PYTHONUSERBASE" ]]; then
@@ -57,7 +60,7 @@ function _python-workon-cwd {
   local ENV_NAME=""
   if [[ -f "$PROJECT_ROOT/.venv" ]]; then
     ENV_NAME="$(cat "$PROJECT_ROOT/.venv")"
-  elif [[ -f "$PROJECT_ROOT/.venv/bin/activate" ]];then
+  elif [[ -f "$PROJECT_ROOT/.venv/bin/activate" ]]; then
     ENV_NAME="$PROJECT_ROOT/.venv"
   elif [[ "$PROJECT_ROOT" != "." ]]; then
     ENV_NAME="${PROJECT_ROOT:t}"
@@ -82,6 +85,7 @@ function _python-workon-cwd {
 # Load auto workon cwd hook
 if zstyle -t ':prezto:module:python:virtualenv' auto-switch 'yes'; then
   # Auto workon when changing directory
+  autoload -Uz add-zsh-hook
   add-zsh-hook chpwd _python-workon-cwd
 fi
 
@@ -92,8 +96,11 @@ if (( $+VIRTUALENVWRAPPER_VIRTUALENV || $+commands[virtualenv] )) && \
   # Set the directory where virtual environments are stored.
   export WORKON_HOME="${WORKON_HOME:-$HOME/.virtualenvs}"
 
-  # Disable the virtualenv prompt.
-  VIRTUAL_ENV_DISABLE_PROMPT=1
+  # Disable the virtualenv prompt. Note that we use the magic value used by the
+  # pure prompt because there's some additional logic in that prompt which tries
+  # to figure out if a user set this variable and disable the python portion of
+  # that prompt based on it which is the exact opposite of what we want to do.
+  export VIRTUAL_ENV_DISABLE_PROMPT=12
 
   # Create a sorted array of available virtualenv related 'pyenv' commands to
   # look for plugins of interest. Scanning shell '$path' isn't enough as they
@@ -105,7 +112,7 @@ if (( $+VIRTUALENVWRAPPER_VIRTUALENV || $+commands[virtualenv] )) && \
 
   if (( $pyenv_plugins[(i)virtualenv-init] <= $#pyenv_plugins )); then
     # Enable 'virtualenv' with 'pyenv'.
-    eval "$(pyenv virtualenv-init -)"
+    eval "$(pyenv virtualenv-init - zsh)"
 
     # Optionally activate 'virtualenvwrapper' plugin when available.
     if (( $pyenv_plugins[(i)virtualenvwrapper(_lazy|)] <= $#pyenv_plugins )); then
@@ -143,18 +150,23 @@ fi
 
 # Load PIP completion.
 if (( $#commands[(i)pip(|[23])] )); then
-  cache_file="${TMPDIR:-/tmp}/prezto-python-cache.$UID.zsh"
+  cache_file="${TMPDIR:-/tmp}/prezto-pip-cache.$UID.zsh"
 
   # Detect and use one available from among 'pip', 'pip2', 'pip3' variants
   pip_command="$commands[(i)pip(|[23])]"
 
-  if [[ "$pip_command" -nt "$cache_file" || ! -s "$cache_file" ]]; then
+  if [[ "$pip_command" -nt "$cache_file" \
+        || "${ZDOTDIR:-$HOME}/.zpreztorc" -nt "$cache_file" \
+        || ! -s "$cache_file" ]]; then
     # pip is slow; cache its output. And also support 'pip2', 'pip3' variants
     $pip_command completion --zsh \
-      | sed -e "s|compctl -K [-_[:alnum:]]* pip|& pip2 pip3|" >! "$cache_file" 2> /dev/null
+      | sed -e "s/\(compctl -K [-_[:alnum:]]* pip\).*/\1{,2,3}{,.{0..9}}/" \
+      >! "$cache_file" \
+      2> /dev/null
   fi
 
   source "$cache_file"
+
   unset cache_file pip_command
 fi
 
diff --git a/modules/rsync/README.md b/modules/rsync/README.md
index b418780b87..77d78ea54c 100644
--- a/modules/rsync/README.md
+++ b/modules/rsync/README.md
@@ -3,7 +3,7 @@ Rsync
 
 Defines [rsync][1] aliases.
 
-Mac OS X users are encouraged to use [Bombich's rsync][2], which has HFS+
+macOS users are encouraged to use [Bombich's rsync][2], which has HFS+
 enhancements.
 
 Aliases
diff --git a/modules/rsync/init.zsh b/modules/rsync/init.zsh
index 3afebdb4dd..b3010ede32 100644
--- a/modules/rsync/init.zsh
+++ b/modules/rsync/init.zsh
@@ -14,14 +14,15 @@ fi
 # Aliases
 #
 
-_rsync_cmd='rsync --verbose --progress --human-readable --compress --archive --hard-links --one-file-system'
+_rsync_cmd='rsync --verbose --progress --human-readable --compress --archive \
+  --hard-links --one-file-system'
 
 if grep -q 'xattrs' <(rsync --help 2>&1); then
   _rsync_cmd="${_rsync_cmd} --acls --xattrs"
 fi
 
-# Mac OS X and HFS+ Enhancements
-# http://help.bombich.com/kb/overview/credits#opensource
+# macOS and HFS+ Enhancements
+# https://bombich.com/kb/ccc5/credits
 if [[ "$OSTYPE" == darwin* ]] && grep -q 'file-flags' <(rsync --help 2>&1); then
   _rsync_cmd="${_rsync_cmd} --crtimes --fileflags --protect-decmpfs --force-change"
 fi
diff --git a/modules/ruby/init.zsh b/modules/ruby/init.zsh
index 3f666c3e0b..4ede36675f 100644
--- a/modules/ruby/init.zsh
+++ b/modules/ruby/init.zsh
@@ -25,9 +25,14 @@ elif (( $+commands[rbenv] )); then
 
 # Load package manager installed chruby into the shell session.
 elif (( $+commands[chruby-exec] )); then
-  source "${commands[chruby-exec]:h:h}/share/chruby/chruby.sh"
+  if (( ! $+functions[chruby] )); then
+    source "${commands[chruby-exec]:h:h}/share/chruby/chruby.sh"
+  fi
+
   if zstyle -t ':prezto:module:ruby:chruby' auto-switch; then
-    source "${commands[chruby-exec]:h:h}/share/chruby/auto.sh"
+    if (( ! $+functions[chruby_auto] )); then
+      source "${commands[chruby-exec]:h:h}/share/chruby/auto.sh"
+    fi
 
     # If a default Ruby is set, switch to it.
     chruby_auto
diff --git a/modules/syntax-highlighting/README.md b/modules/syntax-highlighting/README.md
index 5dad5bbad9..7a5a30c356 100644
--- a/modules/syntax-highlighting/README.md
+++ b/modules/syntax-highlighting/README.md
@@ -3,9 +3,14 @@ Syntax Highlighting
 
 Integrates [zsh-syntax-highlighting][1] into Prezto.
 
-This module should be loaded *second to last*, where last is the *prompt*
-module, unless used in conjuncture with the *history-substring-search* module
-where it must be loaded **before** it.
+This module should be loaded before the *prompt* module.
+
+Additionally, if this module is used in conjunction with the
+*history-substring-search* module, this module must be loaded **before** the
+*history-substring-search* module.
+
+To elaborate: The relative order of loading the modules would be 
+'syntax-highlighting', 'history-substring-search' and 'prompt'.
 
 Contributors
 ------------
diff --git a/modules/tmux/README.md b/modules/tmux/README.md
index 3d742ba684..0738d7cfad 100644
--- a/modules/tmux/README.md
+++ b/modules/tmux/README.md
@@ -62,7 +62,7 @@ Aliases
 Caveats
 -------
 
-On Mac OS X, launching tmux can cause the error **launch_msg(...): Socket is not
+On macOS, launching tmux can cause the error **launch_msg(...): Socket is not
 connected** to be displayed, which can be fixed by installing
 [reattach-to-user-namespace][3], available in [Homebrew][4], and adding the
 following to *tmux.conf*:
@@ -71,7 +71,7 @@ following to *tmux.conf*:
 set-option -g default-command "reattach-to-user-namespace -l $SHELL -l"
 ```
 
-Furthermore, tmux is known to cause **kernel panics** on Mac OS X. A discussion
+Furthermore, tmux is known to cause **kernel panics** on macOS. A discussion
 about this and Prezto has already been [opened][2].
 
 Authors
diff --git a/modules/tmux/init.zsh b/modules/tmux/init.zsh
index a361a6a60b..fb56d07603 100644
--- a/modules/tmux/init.zsh
+++ b/modules/tmux/init.zsh
@@ -23,7 +23,7 @@ if ([[ "$TERM_PROGRAM" = 'iTerm.app' ]] && \
   _tmux_iterm_integration='-CC'
 fi
 
-if [[ -z "$TMUX" && -z "$EMACS" && -z "$VIM" && -z "$INSIDE_EMACS" ]] && ( \
+if [[ -z "$TMUX" && -z "$EMACS" && -z "$VIM" && -z "$INSIDE_EMACS" && -z "$VSCODE_PID" ]] && ( \
   ( [[ -n "$SSH_TTY" ]] && zstyle -t ':prezto:module:tmux:auto-start' remote ) ||
   ( [[ -z "$SSH_TTY" ]] && zstyle -t ':prezto:module:tmux:auto-start' local ) \
 ); then
diff --git a/modules/utility/README.md b/modules/utility/README.md
index 84e81f5c28..3b25b3a75b 100644
--- a/modules/utility/README.md
+++ b/modules/utility/README.md
@@ -8,8 +8,8 @@ Settings
 
 ### Highlighting
 
-If you have enabled color globally in *zpreztorc*, you may disable it for certain
-commands.
+If you have enabled color globally in *zpreztorc*, you may disable it for
+certain commands.
 
 To disable `ls` color, add the following line to *zpreztorc*; when coloring is
 disabled, type indicators (\*, /, =>, @, =, |, %) will be appended to entries.
@@ -18,6 +18,12 @@ disabled, type indicators (\*, /, =>, @, =, |, %) will be appended to entries.
 zstyle ':prezto:module:utility:ls' color 'no'
 ```
 
+To disable GNU coreutils `ls` to list directories grouped first, add the following line to *zpreztorc*:
+
+```sh
+zstyle ':prezto:module:utility:ls' dirs-first 'no'
+```
+
 To disable `diff` highlighting, add the following line to *zpreztorc*:
 
 ```sh
@@ -109,7 +115,8 @@ Aliases
 
 ### Resource Usage
 
-  - `df` displays free disk space using human readable units (aliases to `pydf`, if installed).
+  - `df` displays free disk space using human readable units (aliases to `pydf`,
+    if installed).
   - `du` displays disk usage using human readable units.
   - `top` displays information about processes.
   - `topc` displays information about processes sorted by CPU usage.
diff --git a/modules/utility/functions/wdiff b/modules/utility/functions/wdiff
index c93ead1c6d..ebfad0b82f 100644
--- a/modules/utility/functions/wdiff
+++ b/modules/utility/functions/wdiff
@@ -17,7 +17,7 @@ function wdiff {
         "$@" \
       | sed 's/^\(@@\( [+-][[:digit:]]*,[[:digit:]]*\)\{2\} @@\)$/;5;6m\10m/g'
     elif (( $+commands[git] )); then
-      git --no-pager diff --color=auto --no-ext-diff --no-index --color-words "$@"
+      command git --no-pager diff --color=auto --no-ext-diff --no-index --color-words "$@"
     else
       command wdiff "$@"
     fi
diff --git a/modules/utility/init.zsh b/modules/utility/init.zsh
index 1ccf13b73d..6b07bf0f9e 100644
--- a/modules/utility/init.zsh
+++ b/modules/utility/init.zsh
@@ -73,13 +73,19 @@ fi
 # ls
 if is-callable 'dircolors'; then
   # GNU Core Utilities
-  alias ls='ls --group-directories-first'
+
+  if zstyle -T ':prezto:module:utility:ls' dirs-first; then
+    alias ls="${aliases[ls]:-ls} --group-directories-first"
+  fi
 
   if zstyle -t ':prezto:module:utility:ls' color; then
-    if [[ -s "$HOME/.dir_colors" ]]; then
-      eval "$(dircolors --sh "$HOME/.dir_colors")"
-    else
-      eval "$(dircolors --sh)"
+    # Call dircolors to define colors if they're missing
+    if [[ -z "$LS_COLORS" ]]; then
+      if [[ -s "$HOME/.dir_colors" ]]; then
+        eval "$(dircolors --sh "$HOME/.dir_colors")"
+      else
+        eval "$(dircolors --sh)"
+      fi
     fi
 
     alias ls="${aliases[ls]:-ls} --color=auto"
@@ -89,11 +95,15 @@ if is-callable 'dircolors'; then
 else
   # BSD Core Utilities
   if zstyle -t ':prezto:module:utility:ls' color; then
-    # Define colors for BSD ls.
-    export LSCOLORS='exfxcxdxbxGxDxabagacad'
+    # Define colors for BSD ls if they're not already defined
+    if [[ -z "$LSCOLORS" ]]; then
+      export LSCOLORS='exfxcxdxbxGxDxabagacad'
+    fi
 
-    # Define colors for the completion system.
-    export LS_COLORS='di=34:ln=35:so=32:pi=33:ex=31:bd=36;01:cd=33;01:su=31;40;07:sg=36;40;07:tw=32;40;07:ow=33;40;07:'
+    # Define colors for the completion system if they're not already defined
+    if [[ -z "$LS_COLORS" ]]; then
+      export LS_COLORS='di=34:ln=35:so=32:pi=33:ex=31:bd=36;01:cd=33;01:su=31;40;07:sg=36;40;07:tw=32;40;07:ow=33;40;07:'
+    fi
 
     alias ls="${aliases[ls]:-ls} -G"
   else
@@ -121,7 +131,7 @@ if zstyle -t ':prezto:module:utility:grep' color; then
   alias grep="${aliases[grep]:-grep} --color=auto"
 fi
 
-# Mac OS X Everywhere
+# macOS Everywhere
 if [[ "$OSTYPE" == darwin* ]]; then
   alias o='open'
 elif [[ "$OSTYPE" == cygwin* ]]; then
@@ -151,12 +161,7 @@ elif (( $+commands[wget] )); then
 fi
 
 # Resource Usage
-if (( $+commands[pydf] )); then
-  alias df=pydf
-else
-  alias df='df -kh'
-fi
-
+alias df='df -kh'
 alias du='du -kh'
 
 if [[ "$OSTYPE" == (darwin*|*bsd*) ]]; then
diff --git a/runcoms/README.md b/runcoms/README.md
index 9df890e51a..29d9f8a98d 100644
--- a/runcoms/README.md
+++ b/runcoms/README.md
@@ -10,7 +10,7 @@ in */etc* by default.
 
 User-local configuration files have the same name as their global counterparts
 but are prefixed with a dot (hidden). Zsh looks for these files in the path
-stored in the `$ZDOTDIR` environmental variable. However, if said variable is
+stored in the `$ZDOTDIR` environment variable. However, if said variable is
 not defined, Zsh will use the user's home directory.
 
 File Descriptions
diff --git a/runcoms/zlogout b/runcoms/zlogout
index 56b6b5515e..b5d9858c08 100644
--- a/runcoms/zlogout
+++ b/runcoms/zlogout
@@ -8,11 +8,12 @@
 # Execute code only if STDERR is bound to a TTY.
 [[ -o INTERACTIVE && -t 2 ]] && {
 
-# Print the message.
-cat <<-EOF
+SAYINGS=(
+    "So long and thanks for all the fish.\n  -- Douglas Adams"
+    "Good morning! And in case I don't see ya, good afternoon, good evening and goodnight.\n  --Truman Burbank"
+)
 
-Thank you. Come again!
-  -- Dr. Apu Nahasapeemapetilon
-EOF
+# Print a randomly-chosen message:
+echo $SAYINGS[$(($RANDOM % ${#SAYINGS} + 1))]
 
 } >&2
diff --git a/runcoms/zpreztorc b/runcoms/zpreztorc
index 84074215d8..c6d9a18242 100644
--- a/runcoms/zpreztorc
+++ b/runcoms/zpreztorc
@@ -98,7 +98,7 @@ bindkey "^s" history-incremental-search-forward
 # zstyle ':prezto:module:history-substring-search' globbing-flags ''
 
 #
-# OS X
+# macOS
 #
 
 # Set the keyword used by `mand` to open man pages in Dash.app
@@ -129,13 +129,6 @@ zstyle ':prezto:module:prompt' theme 'psomasundar'
 # return codes. This is not supported by all prompts.
 # zstyle ':prezto:module:prompt' show-return-val 'yes'
 
-#
-# Ruby
-#
-
-# Auto switch the Ruby version on directory change.
-# zstyle ':prezto:module:ruby:chruby' auto-switch 'yes'
-
 #
 # Python
 #
@@ -146,6 +139,13 @@ zstyle ':prezto:module:prompt' theme 'psomasundar'
 # Automatically initialize virtualenvwrapper if pre-requisites are met.
 # zstyle ':prezto:module:python:virtualenv' initialize 'yes'
 
+#
+# Ruby
+#
+
+# Auto switch the Ruby version on directory change.
+# zstyle ':prezto:module:ruby:chruby' auto-switch 'yes'
+
 #
 # Screen
 #