Move GREP_OPTIONS building to bashrc

Shouldn't be exported because it changes the behaviour of grep(1), which
might have unwanted side effects in scripts

1 files changed, 35 insertions, 0 deletions

diff --git a/bash/bashrc.d/grep.bash b/bash/bashrc.d/grep.bash
index be201741..a242603d 100644
--- a/bash/bashrc.d/grep.bash
+++ b/bash/bashrc.d/grep.bash
@@ -1,3 +1,38 @@
+# Store grep(1)'s --help output in a variable
+grep_help=$(grep --help 2>/dev/null)
+
+# Use GREP_OPTIONS to add some useful options to grep(1) calls if applicable
+GREP_OPTIONS=
+case $grep_help in
+    *--binary-files*)
+        GREP_OPTIONS=${GREP_OPTIONS:+$GREP_OPTIONS }'--binary-files=without-match'
+        ;;
+esac
+case $grep_help in
+    *--exclude*)
+        for exclude in .gitignore .gitmodules ; do
+            GREP_OPTIONS=${GREP_OPTIONS:+$GREP_OPTIONS }'--exclude='$exclude
+        done
+        unset -v exclude
+        ;;
+esac
+case $grep_help in
+    *--exclude-dir*)
+        for exclude_dir in .cvs .git .hg .svn ; do
+            GREP_OPTIONS=${GREP_OPTIONS:+$GREP_OPTIONS }'--exclude-dir='$exclude_dir
+        done
+        unset -v exclude_dir
+        ;;
+esac
+
+# We're done parsing grep(1)'s --help output now
+unset -v grep_help
+
+# Export the grep(1) options if we decided on any
+if [ -n "$GREP_OPTIONS" ] ; then
+    export GREP_OPTIONS
+fi
+
 # Define function wrapper for grep(1) with --color option if GREP_COLORS is
 # set; checks that color is available in the terminal within the function
 if [[ ! -n $GREP_COLORS ]] ; then