bcs: add -x argument to specify a file extension

GitOrigin-RevId: 0fa5ad849d0462d085c29665276bcbc5cdf4944a

tools/scripts/bcs.sh

@@ -3,14 +3,17 @@
 # Bad Code Search, with syntax highlighting.
 #
 # Sample usage:
-# bcs.sh --file "\.cs$" Vector3
+# bcs.sh --file "Line" Vector3
 # bcs.sh -i new vector3
 # bcs.sh -C 10 new Vector3
+# bcs.sh -x py sprite
+# bcs.sh -i -x cs -f World spritebatch
 
 # https://stackoverflow.com/questions/192249/how-do-i-parse-command-line-arguments-in-bash
 POSITIONAL=()
 GREP_FLAGS=""
 CONTEXT=3
+
 while [[ $# -gt 0 ]]
 do
 key="$1"
@@ -21,6 +24,11 @@ case $key in
   shift # past argument
   shift # past value
   ;;
+  -x|--extension)
+  EXTENSION="\.$2\$"
+  shift # past argument
+  shift # past value
+  ;;
   -i|--ignore-case)
   GREP_FLAGS="-i"
   shift # past argument
@@ -39,7 +47,7 @@ done
 set -- "${POSITIONAL[@]}" # restore positional parameters
 
 if [[ -z $@ ]]; then
-  echo 'Usage: bcs.sh [-i] [-f/--file FILE_PATTERN] [-C/--context NUM_LINES] QUERY'
+  echo 'Usage: bcs.sh [-i] [-f/--file FILE_PATTERN] [-x/--extension EXTENSION] [-C/--context NUM_LINES] QUERY'
   exit 1
 fi
 
@@ -47,6 +55,10 @@ fi
 # We just turn spaces into "match anything", which kinda ignores the cruft.
 QUERY=`echo $@ | sed -e "s/ /.*/g"`
 
+if [[ -n $EXTENSION ]]; then
+  FILE="${FILE}.*${EXTENSION}"
+fi
+
 if [[ -n $FILE ]]; then
   files=$(git ls-tree -r master --name-only | grep "${FILE}")
   if [[ -z $files ]]; then