The build watcher: Automatically rebuild Pelican content as files change.

Makefile

# Changes gather, and now my watch begins.
# It shall not end until my death.
# I shall live and die at my post. 
# I am the process in the darkness. 
# I am the watcher on the files. 
# I am the shield that guards the realms of the build dir. 

watch:
        @which inotifywait || (echo "Please install inotifywait";exit 2)
        @while true ; do \
                inotifywait -r . -e create,delete,move,modify || break; \
                $(MAKE) html || break;\
        done