add bcs.sh (Bad Code Search)

fixes #22.

GitOrigin-RevId: f13bee397fc4bfc957f07cb89d1766ee55ae0415

tools/scripts/bcs.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+
+# Bad Code Search, with syntax highlighting.
+#
+# Sample usage:
+# bcs.sh --file Lines.*cs Vector3
+# bcs.sh -i new vector3
+
+# https://stackoverflow.com/questions/192249/how-do-i-parse-command-line-arguments-in-bash
+POSITIONAL=()
+while [[ $# -gt 0 ]]
+do
+key="$1"
+
+case $key in
+  -f|--file)
+  FILE="$2"
+  shift # past argument
+  shift # past value
+  ;;
+  -i|--ignore-case)
+  GREP_FLAGS="-i"
+  shift # past argument
+  ;;
+  *)    # unknown option
+  POSITIONAL+=("$1") # save it in an array for later
+  shift # past argument
+  ;;
+esac
+done
+set -- "${POSITIONAL[@]}" # restore positional parameters
+
+if [[ -z $@ ]]; then
+  echo 'Usage: bcs.sh [-i] [-f/--file FILE_PATTERN] QUERY'
+  exit 1
+fi
+
+# highlight(1) sticks some ANSI cruft into the output.
+# We just turn spaces into "match anything", which kinda ignores the cruft.
+QUERY=`echo $@ | sed -e "s/ /.*/g"`
+
+if [[ -n $FILE ]]; then
+  files=$(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`;
+  do
+    echo $file:
+    highlight --force --line-numbers -O xterm256 --stdout $file | \
+        grep -C 5 $GREP_FLAGS "$QUERY" --label=$file | perl -pne s%^--\$%$file:%
+  done
+else
+  for file in `grep -l $GREP_FLAGS "$QUERY" $(git ls-tree -r master --name-only)`
+  do
+    echo $file:
+    highlight --force --line-numbers -O xterm256 --stdout $file | \
+        grep -C 5 $GREP_FLAGS "$QUERY" --label=$file | perl -pne s%^--\$%$file:%
+  done
+fi