Allow autostow.sh to selectively ignore directories

By default autostow.sh ignores assets/ and bootstrap/ directories. This
behavior can be changed through the `AUTOSTOW_IGNORED_DIRS` environment
variable. It should contain the name of the directories to ignore,
separated by a `:`.

bootstrap/.config/bootstrap/autostow.sh

@@ -6,8 +6,43 @@
 #
 # Invokes stow for every folder within this repository, and that's it.
 
+ignore="${AUTOSTOW_IGNORED_DIRS:-"bootstrap:assets"}"
+
+main() {
+  case "$1" in
+  -s | --stow)
+    have_stow
+    echo "Creating dotfile symlinks ................................................."
+    stow_dirs
+    echo "Done creating symlinks ...................................................."
+    exit 0
+    ;;
+  -d | --delete)
+    have_stow
+    echo "Removing dotfile symlinks ................................................."
+    unstow_dirs
+    echo "Done removing symlinks ...................................................."
+    exit 0
+    ;;
+  -v | --version)
+    printf "System bootstrap script.\n\n©Marty Oehme\n\nVersion: 0.2\n"
+    ;;
+  -h | --help | *)
+    usage
+    exit 0
+    ;;
+  esac
+  shift
+}
+
 stow_dirs() {
   for d in */; do
+
+    if is_ignored "$d"; then
+      printf "ignoring %s\n" "$d"
+      continue
+    fi
+
     printf "stowing %s\n" "$d"
     stow -S -t ~ "$d"
   done
@@ -15,11 +50,27 @@ stow_dirs() {
 
 unstow_dirs() {
   for d in */; do
+
+    if is_ignored "$d"; then
+      printf "ignoring %s\n" "$d"
+      continue
+    fi
+
     printf "unstowing %s\n" "$d"
     stow -D -t ~ "$d"
   done
 }
 
+is_ignored() {
+  IFS=":"
+  for ign in $ignore; do
+    if [ "$ign" == "$1" ] || [ "$ign/" == "$1" ]; then
+      return 0
+    fi
+  done
+  return 1
+}
+
 have_stow() {
   if ! type stow >/dev/null 2>&1; then
     printf "GNU stow needs to be installed for this script to function. Please install stow through your package manager.\n"
@@ -46,28 +97,4 @@ usage() {
     ""
 }
 
-main() {
-  case "$1" in
-  -s | --stow)
-    have_stow
-    echo "Creating dotfile symlinks ................................................."
-    stow_dirs
-    echo "Done creating symlinks ...................................................."
-    exit 0
-    ;;
-  -d | --delete)
-    have_stow
-    echo "Removing dotfile symlinks ................................................."
-    unstow_dirs
-    echo "Done removing symlinks ...................................................."
-    exit 0
-    ;;
-  -h | --help | *)
-    usage
-    exit 0
-    ;;
-  esac
-  shift
-}
-
 main "$@"