Add various utility functions

_reformat-common.bash

@@ -1,10 +1,71 @@
-function root() {
-    git rev-parse --show-toplevel
+function get_os() {
+    un=$(uname)
+
+    if [[ "$un" = "Linux" ]] ; then
+       echo -n "linux"
+       return 0
+    fi
+
+    if [[ "$un" = "Darwin" ]] ; then
+        echo -n "osx"
+        return 0
+    fi
 }
 
-wfroot() {
-    dir="$1"
-    cat "$dir/.root"
+OPERATING_SYSTEM=$(get_os)
+
+# For a given file, return its corresponding project root.
+function project_root() {
+    pushd $(dirname "$1") 2>&1 > /dev/null
+    out=$(git rev-parse --show-toplevel)
+    ret="$?"    
+    popd 2>&1 > /dev/null
+
+    if [[ "$ret" != "0" ]] ; then
+        echo -n ""
+        return 1
+    fi
+    
+    echo -n "$out"
+    return 0
+}
+
+# When run from a dir with would-format configured, return
+# would-format's own directory
+wf_root() {
+    arg=$(pwd)/bin/would-reformat.sh
+
+    pr=$(project_root $arg)
+
+    link="$pr/bin/would-reformat.sh"
+
+    original0=$(resolve_symlink "$link")
+    original=$(normalize_dir_of_file $original0)
+
+    out="$original"
+
+    echo "$out"
+    return 0
+}
+
+# FIXME: Make this bail if it fails
+function normalize_dir_of_file() {
+    out0=$(readlink -m "$1")
+
+    out=$(dirname "$out0")
+
+    echo -n "$out"
+    return 0
+}
+
+function resolve_symlink() {
+    if [[ "$OPERATING_SYSTEM" = "osx" ]] ; then
+        out=$(readlink "$1")
+    else 
+        out=$(readlink -f "$1")
+    fi 
+
+    echo "$out"
 }
 
 function custom_formatter() {