improvement(builder): make regex more specific

So it matches `.git` but not `..git..`.

Also makes a few other tweaks:

- ignore 4913 from watching: vim creates this sometimes
- improve inotifywait command

builder.sh

@@ -7,7 +7,12 @@ cmd="--html-url-extension-style=indexify site.yml"
 srcdir="modules"
 buildir="public"
 previewpidfile="preview.pid"
-inotifyignore=".git*"
+
+# 4913: for vim users, vim creates a temporary file to test it can write to
+# directory
+# https://groups.google.com/g/vim_dev/c/sppdpElxY44
+# .git: so we don't get rebuilds each time git metadata changes
+inotifyignore="\.git.*|4913"
 
 watch_and_build () {
     if ! command -v inotifywait > /dev/null
@@ -29,12 +34,12 @@ watch_and_build () {
             # temporary files that are updated regularly and so on, so better
             # to get the list from git. It'll also look at global gitingore
             # settings and so on.
-            inotifyignore="$(git status -s --ignored | grep '^!!' | sed -e 's/^!! //' -e 's:/:\*:' | tr '\n' '|')${inotifyignore}"
+            inotifyignore="$(git status -s --ignored | grep '^!!' | sed -e 's/^!! //' | tr '\n' '|')${inotifyignore}"
         fi
 
         while true
         do
-            echo "Watching current directory (excluding ${inotifyignore}) for changes and re-building as required. Use Ctrl C to stop."
+            echo "Watching current directory (excluding: ${inotifyignore}) for changes and re-building as required. Use Ctrl C to stop."
             inotifywait -q --exclude "($inotifyignore)" -e modify,create,delete,move -r . && echo "Change detected, rebuilding.." && build
         done
     fi