Make plot shell script nicer.

tools/plot-timer-events

 #!/bin/sh
 
 # find the name of the log file to process, it must not start with a dash.
 log_file="v8.log"
 for arg in "$@"
 do
   if ! expr "X${arg}" : "^X-" > /dev/null; then
     log_file=${arg}
   fi
 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();"
 
   $d8_exec --nocrankshaft --prof --logfile $calibration_log \
        --log-timer-events -e "$calibration_script" > /dev/null
   t_1_start=`grep "timer-event-start,\"V8.Execute\"" $calibration_log  \
        | tail -n1 | awk -F, '{print $3}'`
   t_1_end=`grep "timer-event-end,\"V8.Execute\"" $calibration_log  \
        | tail -n1 | awk -F, '{print $3}'`
@@ skipping 17 matching lines @@
 fi
 
 cat $log_file |
     $d8_exec $tools_path/csvparser.js $tools_path/splaytree.js \
     $tools_path/codemap.js $tools_path/profile.js $tools_path/profile_view.js \
     $tools_path/logreader.js $tools_path/tickprocessor.js \
     $tools_path/profviz/composer.js $tools_path/profviz/stdio.js \
     -- $@ $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
 fi
 
 rm -f timer-events.plot