Force some directories to be symlinks

Typically a directory structure is copied instead of symlinked, while
files are symlinked. However, some cases require symlinked dirs: git
submodules, vim plugins, and so on.

This introduces a `SYMLINK_DIRS` option for rcrc(5) that takes a
space-separated list of "exclude patterns". Any directory matching these
patterns is symlinked.

This also introduces a `-S` argument for lsrc(1), rcup(1), and rcdn(1).
This argument takes a pattern, for one-off directory symlinking. It can
be repeated.

This also introduces `-S` and `-s` for mkrc(1). `-S` will re-install the
files as symlinks, and `-s` will not.

This does work with `-C`, though perhaps unintuitively - we don't know
what the user means in this case. However, it will not crash.

Bug: `-s` does not work right if `SYMLINK_DIRS` is set. Bug #36
addresses this.

1 files changed, 6 insertions, 1 deletions

diff --git a/bin/rcup b/bin/rcup
index f5c9459..5ba4822 100755
--- a/bin/rcup
+++ b/bin/rcup
@@ -104,9 +104,10 @@ handle_command_line() {
   local excludes=
   local includes=
   local always_copy=0
+  local symlink_dirs=
   REPLACE_ALL=0
 
-  while getopts CVqvfhikKI:x:t:d: opt; do
+  while getopts CVqvfhikKI:x:S:t:d: opt; do
     case "$opt" in
       C) always_copy=1 ;;
       d) dotfiles_dirs="$dotfiles_dirs $OPTARG" ;;
@@ -118,6 +119,7 @@ handle_command_line() {
       K) run_hooks=0 ;;
       q) verbosity=$(($verbosity - 1)) ;;
       t) arg_tags="$arg_tags $OPTARG" ;;
+      S) symlink_dirs="$symlink_dirs $OPTARG";;
       v) verbosity=$(($verbosity + 1)) ;;
       V) version=1 ;;
       x) excludes="$excludes $OPTARG" ;;
@@ -148,6 +150,9 @@ handle_command_line() {
   for include in $includes; do
     LS_ARGS="$LS_ARGS -I $include"
   done
+  for symlink_dir in $symlink_dirs; do
+    LS_ARGS="$LS_ARGS -S $symlink_dir"
+  done
   LS_ARGS="$LS_ARGS $files"
 
   $DEBUG "LS_ARGS: $LS_ARGS"