Support multiple source directories

The `rcup` and `mkrc` commands now support multiple source directories.
This is useful for sharing dotfiles between friends, spliting dotfiles
into private and public ones, or other such situations.

In `mkrc` this support means that you can specify the destination
directory for your dotfile, either from the command-line or from you
`~/.rcrc` configuration.

In `rcup` this means that it will recur through all source directories,
in order, creating the symlinks as needed. This means that duplicated
files will not be overridden. The order can be specified by the `-d`
option, which can be repeated, or by the `DOTFILES_DIRS` option in your
`~/.rcrc` configuration. The `-d` option overrides the configuration.

For example, this configuration file will update from the two
directories in order:

    DOTFILES_DIRS="/home/mike/.dotfiles/public /home/mike/.dotfiles/private"

Any source directories that don't exist are skipped.

1 files changed, 41 insertions, 22 deletions

diff --git a/bin/rcup b/bin/rcup
index 0569997..64626b3 100755
--- a/bin/rcup
+++ b/bin/rcup
@@ -5,14 +5,12 @@
 REPLACE_ALL=0
 
 DEST_DIR=$HOME
-DOTFILES_DIR=$HOME/.dotfiles
+DEFAULT_DOTFILES_DIR=$HOME/.dotfiles
 HOSTNAME=`hostname -s`
-HOST_FILES=$DOTFILES_DIR/host-$HOSTNAME
 DEBUG=:
 PRINT=echo
 VERBOSE=:
 PROMPT=echo
-DIR_STACK=":$DOTFILES_DIR"
 MKDIR=mkdir
 LN=ln
 RM=rm
@@ -138,11 +136,13 @@ handle_command_line() {
   arg_tags=""
   verbosity=0
   version=0
-  while getopts Vqvt: opt; do
+  dotfiles_dirs=
+  while getopts Vqvt:d: opt; do
     case "$opt" in
       t) arg_tags="$arg_tags $OPTARG";;
       v) verbosity=$(($verbosity + 1));;
       q) verbosity=$(($verbosity - 1));;
+      d) dotfiles_dirs="$dotfiles_dirs $OPTARG";;
       V) version=1
     esac
   done
@@ -173,6 +173,10 @@ handle_command_line() {
     TAGS=$arg_tags
   fi
 
+  if [ "x$dotfiles_dirs" != "x" ]; then
+    DOTFILES_DIRS=$dotfiles_dirs
+  fi
+
   FILES=$@
 }
 
@@ -183,34 +187,49 @@ fi
 . `dirname $0`/../libexec/rcm/rcm.sh
 handle_command_line $*
 
-cd $DOTFILES_DIR
+if [ "x$DOTFILES_DIRS" = "x" ]; then
+  DOTFILES_DIRS="$DOTFILES_DIRS $DEFAULT_DOTFILES_DIR"
+fi
+
+for DOTFILES_DIR in $DOTFILES_DIRS; do
 
-for file in ${FILES:-*}; do
-  host_portion=`echo $file | sed -e 's/host-.*/host-/'`
-  tag_portion=`echo $file | sed -e 's/tag-.*/tag-/'`
-  if ! metafile $file $host_portion $tag_portion; then
-    handle_file $file $DEST_DIR $DOTFILES_DIR 0
+  if [ ! -d $DOTFILES_DIR ]; then
+    $VERBOSE "skipping non-existent directory: $DOTFILES_DIR" 
+    continue
   fi
-done
 
-cd $DOTFILES_DIR
+  cd $DOTFILES_DIR
+  DIR_STACK=":$DOTFILES_DIR"
 
-if [ -d $HOST_FILES ]; then
-  pushdir `basename $HOST_FILES`
   for file in ${FILES:-*}; do
-    handle_file $file $DEST_DIR $HOST_FILES 0
+    host_portion=`echo $file | sed -e 's/host-.*/host-/'`
+    tag_portion=`echo $file | sed -e 's/tag-.*/tag-/'`
+    if ! metafile $file $host_portion $tag_portion; then
+      handle_file $file $DEST_DIR $DOTFILES_DIR 0
+    fi
   done
-  popdir
-fi
 
-cd $DOTFILES_DIR
+  cd $DOTFILES_DIR
 
-for tag in $TAGS; do
-  if [ -d tag-$tag ]; then
-    pushdir `basename tag-$tag`
+  host_files=$DOTFILES_DIR/host-$HOSTNAME
+  if [ -d $host_files ]; then
+    pushdir `basename $host_files`
     for file in ${FILES:-*}; do
-      handle_file $file $DEST_DIR $DOTFILES_DIR/tag-$tag 0
+      handle_file $file $DEST_DIR $host_files 0
     done
     popdir
   fi
+
+  cd $DOTFILES_DIR
+
+  for tag in $TAGS; do
+    if [ -d tag-$tag ]; then
+      pushdir `basename tag-$tag`
+      for file in ${FILES:-*}; do
+        handle_file $file $DEST_DIR $DOTFILES_DIR/tag-$tag 0
+      done
+      popdir
+    fi
+  done
+
 done