Make plot shell script nicer.

tools/plot-timer-events

Index: tools/plot-timer-events
diff --git a/tools/plot-timer-events b/tools/plot-timer-events
index 8db067d5f12c800df35dc5c4e6cffbf3743150d0..87ae0a087789320154f7fe684e12719e0b2b4691 100755
--- a/tools/plot-timer-events
+++ b/tools/plot-timer-events
@@ -10,29 +10,43 @@ do
 done
 
 tools_path=`cd $(dirname "$0");pwd`
-if [ ! "$D8_PATH" ]; then
+if test ! "$D8_PATH"; then
   d8_public=`which d8`
-  if [ -x "$d8_public" ]; then D8_PATH=$(dirname "$d8_public"); fi
+  if test -x "$d8_public"; then D8_PATH=$(dirname "$d8_public"); fi
 fi
-[ -n "$D8_PATH" ] || D8_PATH=$tools_path/..
+
+if test -n "$D8_PATH"; then
+  D8_PATH=$tools_path/..
+fi
+
 d8_exec=$D8_PATH/d8
 
-if [ ! -x "$d8_exec" ]; then
+if test ! -x "$d8_exec"; then
   D8_PATH=`pwd`/out/native
   d8_exec=$D8_PATH/d8
 fi
 
-if [ ! -x "$d8_exec" ]; then
+if test ! -x "$d8_exec"; then
   d8_exec=`grep -m 1 -o '".*/d8"' $log_file | sed 's/"//g'`
 fi
 
-if [ ! -x "$d8_exec" ]; then
+if test ! -x "$d8_exec"; then
   echo "d8 shell not found in $D8_PATH"
   echo "To build, execute 'make native' from the V8 directory"
   exit 1
 fi
 
-if [[ "$@" != *--distortion* ]]; then
+
+contains=0;
+for arg in "$@"; do
+  `echo "$arg" | grep -q "^--distortion"`
+  if test $? -eq 0; then
+    contains=1
+    break
+  fi
+done
+
+if test "$contains" -eq 0; then
   # Try to find out how much the instrumentation overhead is.
   calibration_log=calibration.log
   calibration_script="for (var i = 0; i < 1000000; i++) print();"
@@ -70,7 +84,7 @@ cat $log_file |
     -- $@ $options 2>/dev/null > timer-events.plot
 
 success=$?
-if [[ $success != 0 ]] ; then
+if test $success -ne 0; then
     cat timer-events.plot
 else
     cat timer-events.plot | gnuplot > timer-events.png