Inclusionary patterns: -I

The `-I` flag serves as an "undo" for the `-e` pattern. It overrides any
matching exclusions, allowing for temporary
listing/installation/removal.

For example, if you want to try a `.pythonrc` but leave it in your
`EXCLUDES` in rcrc(5), you can do:

    rcup -Ipythonrc pythonrc

1 files changed, 6 insertions, 1 deletions

diff --git a/bin/rcdn b/bin/rcdn
index 66e064f..a7fb81d 100755
--- a/bin/rcdn
+++ b/bin/rcdn
@@ -10,10 +10,12 @@ handle_command_line() {
   local dotfiles_dirs=
   local files=
   local excludes=
+  local includes=
 
-  while getopts Vqve:t:d: opt; do
+  while getopts VqvI:e:t:d: opt; do
     case "$opt" in
       e) excludes="$excludes $OPTARG";;
+      I) includes="$includes $OPTARG";;
       t) arg_tags="$arg_tags $OPTARG" ;;
       v) verbosity=$(($verbosity + 1));;
       q) verbosity=$(($verbosity - 1));;
@@ -38,6 +40,9 @@ handle_command_line() {
   for exclude in $excludes; do
     LS_ARGS="$LS_ARGS -e $exclude"
   done
+  for include in $includes; do
+    LS_ARGS="$LS_ARGS -I $include"
+  done
   LS_ARGS="$LS_ARGS $files"
 
   $DEBUG "LS_ARGS: $LS_ARGS"