change rotdir to use ed(1)

.scripts/tools/rotdir

@@ -1,3 +1,16 @@
 #!/bin/sh
-# Give this script a filename argument. Returns PWD rotated with that file first.
-ls "$PWD" | awk "BEGIN { lines = \"\"; m = 0; } /^$1$/ { m = 1; } { if (!m) { if (lines) { lines = lines\"\n\"; } lines = lines\"\"\$0; } else { print \$0; } } END { print lines; }"
+if [ -z "$1" ]; then
+	echo usage: rotdir regex 2>&1
+	exit 1;
+fi
+
+ed -s <<EOF
+# Read in all files in the current dir
+r !find "$PWD" -maxdepth 1
+# Search all lines for regex, move to top
+g/$1/m0
+# Print all lines
+,p
+# Force quit
+Q
+EOF