[pph contrib] Add support for multiple spawn patterns in repro_fail (issue4571061)

[dnovillo at google dot com (Diego Novillo)]

So I had to go back to grep|sed instead of just sed because I want
to use extended regexps supported by grep -E.  In pph this is useful
so that you can specify patterns that match both the writing and the
reading of the PPH files.

I'm thinking that this script is better written in python, but that
may make it less generic and I don't know whether we accept python in
gcc/contrib.  Alex?

Committed to pph branch.


Diego.


	* repro_fail: Add support for patterns matching multiple spawns.

diff --git a/contrib/repro_fail b/contrib/repro_fail
index d5bce04..8100456 100755
--- a/contrib/repro_fail
+++ b/contrib/repro_fail
@@ -1,6 +1,6 @@
-#!/bin/bash
+#!/bin/bash -eu
 #
-# Script to reproduce a test failure from a dejagnu .log file
+# Script to reproduce a test failure from a dejagnu .log file.
 #
 # Contributed by Diego Novillo <dnovillo@google.com>
 #
@@ -23,6 +23,13 @@
 # the Free Software Foundation, 51 Franklin Street, Fifth Floor,
 # Boston, MA 02110-1301, USA.
 
+# This script will search a line starting with 'spawn' that includes the
+# pattern you are looking for (typically a source file name).
+#
+# Once it finds that pattern, it re-executes the whole command
+# in the spawn line.  If the pattern matches more than one spawn
+# command, it asks which one you want.
+
 if [ $# -lt 2 ] ; then
     echo "usage: $0 pattern file.log [additional-args]"
     echo
@@ -32,18 +39,44 @@ if [ $# -lt 2 ] ; then
     exit 1
 fi
 
-set -e
-pattern=$1
-logf=$2
+pattern="$1"
+logf="$2"
 shift 2
-args="$@"
-line=$(grep "^spawn .*$pattern" $logf | sed -e "s:^spawn ::")
 
-if [ "$line" = "" ] ; then
-    echo "Could not find a spawn command for pattern $1"
+# Find the commands in LOGF that reference PATTERN.
+lines=$(grep -E "^spawn .*$pattern" $logf | sed -e 's/^spawn //')
+if [ -z "$lines" ] ; then
+    echo "Could not find a spawn command for pattern $pattern"
     exit 1
 fi
 
-set -x +e
-$line $args
-exit $?
+# Collect all the command lines into the COMMANDS array.
+old_IFS="$IFS"
+IFS="
"
+num_lines=0
+for line in $lines ; do
+    num_lines=$[$num_lines + 1]
+    echo "[$num_lines] $line"
+    commands[$num_lines]=$line
+done
+
+# If we found more than one line for PATTERN, ask which one we should run.
+cmds_to_run='0'
+if [ $num_lines -gt 1 ] ; then
+    echo
+    echo
+    echo -n "Enter the list of commands to run or '0' to run them all: "
+    read cmds_to_run
+fi
+if [ "$cmds_to_run" = "0" ] ; then
+    cmds_to_run=$(seq 1 $num_lines)
+fi
+IFS="$old_IFS"
+
+# Finally, execute all the commands we were told to execute.
+for cmd_num in $cmds_to_run ; do
+    cmd=${commands[$cmd_num]}
+    set -x +e
+    $cmd "$@"
+    set +x -e
+done

--
This patch is available for review at http://codereview.appspot.com/4571061