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 [ "${OS}" = "Darwin" ]; then
+case "$OS" in
+Linux)
+  MACHINE=$(getconf LONG_BIT)
+  case "$MACHINE" in
+  64)   exec "${THIS_DIR}/ninja-linux64" "$@";;

[iannucci, 2012/12/11 00:25:34]

I might do something like:

32|64) exec "${THIS_DIR}/ninja-linux${MACHINE}" "$@";;

But I'm not sure how you feel about that.

[tony, 2012/12/11 00:34:52]

Done.

+  32)   exec "${THIS_DIR}/ninja-linux32" "$@";;
+  *)    echo Unknown architecture \($MACHINE\) -- unable to run ninja.
+        exit 1
+        ;;
+  esac
+  ;;
+Darwin)

[iannucci, 2012/12/11 00:25:34]

Maybe these can all be on one line each like for the case $MACHINE ones?

[tony, 2012/12/11 00:34:52]

Done.

   exec "${THIS_DIR}/ninja-mac" "$@"
-elif [[ ${OS} == CYGWIN* ]]; then
+  ;;
+CYGWIN*)
   exec cmd.exe /c `cygpath -t windows $0`.exe "$@"

[iannucci, 2012/12/11 00:25:34]

Should use $() over ``

[tony, 2012/12/11 00:34:52]

Done.

-elif [[ ${OS} == MINGW32* ]]; then
+  ;;
+MINGW32*)
   cmd.exe //c $0.exe "$@"
-else
+  ;;
+*)
   echo "Unsupported OS ${OS}"
   exit 1
-fi
-
+  ;;
+esac