bcs: add ability to set context lines; clean up some expansions

GitOrigin-RevId: 718fc9bb92

tools/scripts/bcs.sh

@@ -3,11 +3,14 @@
 # Bad Code Search, with syntax highlighting.
 #
 # Sample usage:
-# bcs.sh --file Lines.*cs Vector3
+# bcs.sh --file "\.cs$" Vector3
 # bcs.sh -i new vector3
+# bcs.sh -C 10 new Vector3
 
 # 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"
@@ -22,6 +25,11 @@ case $key in
   GREP_FLAGS="-i"
   shift # past argument
   ;;
+  -C|--context)
+  CONTEXT="$2"
+  shift # past argument
+  shift # past value
+  ;;
   *)    # unknown option
   POSITIONAL+=("$1") # save it in an array for later
   shift # past argument
@@ -31,7 +39,7 @@ done
 set -- "${POSITIONAL[@]}" # restore positional parameters
 
 if [[ -z $@ ]]; then
-  echo 'Usage: bcs.sh [-i] [-f/--file FILE_PATTERN] QUERY'
+  echo 'Usage: bcs.sh [-i] [-f/--file FILE_PATTERN] [-C/--context NUM_LINES] QUERY'
   exit 1
 fi
 
@@ -40,23 +48,23 @@ fi
 QUERY=`echo $@ | sed -e "s/ /.*/g"`
 
 if [[ -n $FILE ]]; then
-  files=$(git ls-tree -r master --name-only | grep "$FILE")
+  files=$(git ls-tree -r master --name-only | grep "${FILE}")
   if [[ -z $files ]]; then
     echo "no files matched"
     exit 0
   fi
 
-  for file in `grep -l $GREP_FLAGS "$QUERY" $files`;
+  for file in `grep -l ${GREP_FLAGS} "${QUERY}" $files`;
   do
     echo $file:
     highlight --force --line-numbers -O xterm256 --stdout $file | \
-        grep -C 5 $GREP_FLAGS "$QUERY" --label=$file | perl -pne s%^--\$%$file:%
+        grep -C ${CONTEXT} ${GREP_FLAGS} "${QUERY}" --label=$file | perl -pne s%^--\$%$file:%
   done
 else
-  for file in `grep -l $GREP_FLAGS "$QUERY" $(git ls-tree -r master --name-only)`
+  for file in `grep -l ${GREP_FLAGS} "${QUERY}" $(git ls-tree -r master --name-only)`
   do
     echo $file:
     highlight --force --line-numbers -O xterm256 --stdout $file | \
-        grep -C 5 $GREP_FLAGS "$QUERY" --label=$file | perl -pne s%^--\$%$file:%
+        grep -C ${CONTEXT} ${GREP_FLAGS} "${QUERY}" --label=$file | perl -pne s%^--\$%$file:%
   done
 fi