Clean up the style in the ninja shell wrapper.

ninja

 #!/bin/bash
 
 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 OS="$(uname -s)"
 THIS_DIR="$(dirname "${0}")"
 
-if [ "${OS}" = "Linux" ]; then
-  machine=$(getconf LONG_BIT)
-  if [[ "$machine" = "64" ]]; then
-    exec "${THIS_DIR}/ninja-linux64" "$@"
-  elif [[ "$machine" = "32" ]]; then
-    exec "${THIS_DIR}/ninja-linux32" "$@"
-  else
-    echo Unknown architecture \($machine\) -- unable to run ninja.
-    exit 1
-  fi
-elif [ "${OS}" = "Darwin" ]; then
-  exec "${THIS_DIR}/ninja-mac" "$@"
-elif [[ ${OS} == CYGWIN* ]]; then
-  exec cmd.exe /c `cygpath -t windows $0`.exe "$@"
-elif [[ ${OS} == MINGW32* ]]; then
-  cmd.exe //c $0.exe "$@"
-else
-  echo "Unsupported OS ${OS}"
-  exit 1
-fi
-
+case "$OS" in
+Linux)

[M-A Ruel, 2012/12/11 17:43:46]

Please align at +2 and the inner at +4.

[tony, 2012/12/11 17:53:33]

Done.

+  MACHINE=$(getconf LONG_BIT)
+  case "$MACHINE" in
+  32|64)   exec "${THIS_DIR}/ninja-linux${MACHINE}" "$@";;

[M-A Ruel, 2012/12/11 17:43:46]

Same

+  *)       echo Unknown architecture \($MACHINE\) -- unable to run ninja.
+           exit 1
+           ;;
+  esac
+  ;;
+Darwin)    exec "${THIS_DIR}/ninja-mac" "$@";;
+CYGWIN*)   exec cmd.exe /c $(cygpath -t windows $0).exe "$@";;
+MINGW32*)  cmd.exe //c $0.exe "$@";;
+*)         echo "Unsupported OS ${OS}"
+           exit 1;;
+esac