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+#compdef stack
+# ------------------------------------------------------------------------------
+# Copyright (c) 2015 Github zsh-users - http://github.com/zsh-users
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in the
+#       documentation and/or other materials provided with the distribution.
+#     * Neither the name of the zsh-users nor the
+#       names of its contributors may be used to endorse or promote products
+#       derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL ZSH-USERS BE LIABLE FOR ANY
+# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# ------------------------------------------------------------------------------
+# Description
+# -----------
+#
+#  Completion script for stack (https://github.com/commercialhaskell/stack).
+#
+# ------------------------------------------------------------------------------
+# Authors
+# -------
+#
+#  * Toshiki Teramura <toshiki.teramura@gmail.com>
+#
+# ------------------------------------------------------------------------------
+
+_stack () {
+    _arguments \
+        --version'[Show version]' \
+        --help'[Show this help text]' \
+        '--docker*''[Run "stack --docker-help" for details]' \
+        --verbosity'[Verbosity: silent, error, warn, info, debug]' \
+        {-v,--verbose}'[Enable verbose mode: verbosity level "debug"]' \
+        --system-ghc'[Enable using the system installed GHC (on the PATH) if available and a matching version]' \
+        --no-system-ghc'[Disable using the system installed GHC (on the PATH) if available and a matching version]' \
+        --install-ghc'[Enable downloading and installing GHC if necessary (can be done manually with stack setup)]' \
+        --no-install-ghc'[Disable downloading and installing GHC if necessary (can be done manually with stack setup)]' \
+        --arch'[System architecture, e.g. i386, x86_64]' \
+        --os'[Operating system, e.g. linux, windows]' \
+        {-j,--jobs}'[Number of concurrent jobs to run]' \
+        --extra-include-dirs'[Extra directories to check for C header files]' \
+        --extra-lib-dirs'[Extra directories to check for libraries]' \
+        --skip-ghc-check'[Enable skipping the GHC version and architecture check]' \
+        --no-skip-ghc-check'[Disable skipping the GHC version and architecture check]' \
+        --skip-msys'[Enable skipping the local MSYS installation (Windows only)]' \
+        --no-skip-msys'[Disable skipping the local MSYS installation (Windows only)]' \
+        --resolver'[Override resolver in project file]' \
+        --no-terminal'[Override terminal detection in the case of running in a false terminal]' \
+        --stack-yaml'[Override project stack.yaml file (overrides any STACK_YAML environment variable)]' \
+        '*: :__stack_modes'
+}
+
+__stack_modes () {
+    _values \
+        'subcommand' \
+        'build[Build the project(s) in this directory/configuration]' \
+        'install[Build executables and install to a user path]' \
+        'test[Build and test the project(s) in this directory/configuration]' \
+        'bench[Build and benchmark the project(s) in this directory/configuration]' \
+        'haddock[Generate haddocks for the project(s) in this directory/configuration]' \
+        'new[Create a brand new project]' \
+        'init[Initialize a stack project based on one or more cabal packages]' \
+        'solver[Use a dependency solver to try and determine missing extra-deps]' \
+        'setup[Get the appropriate ghc for your project]' \
+        'path[Print out handy path information]' \
+        'unpack[Unpack one or more packages locally]' \
+        'update[Update the package index]' \
+        'upgrade[Upgrade to the latest stack (experimental)]' \
+        'upload[Upload a package to Hackage]' \
+        'dot[Visualize your projects dependency graph using Graphviz dot]' \
+        'exec[Execute a command]' \
+        'ghc[Run ghc]' \
+        'ghci[Run ghci in the context of project(s)]' \
+        'ide[Run ide-backend-client with the correct arguments]' \
+        'runghc[Run runghc]' \
+        'clean[Clean the local packages]' \
+        'docker[Subcommands specific to Docker use]'
+
+}