Smarter PWD is an improved pwd for long paths. If your command line prompt displays current path, it is a bit annoying when you go into a really deep directory: your cursor will be placed almost at the right side of the terminal window, leaving almost no space for user input and forcing a jump to a new line. SPWD is a replacement for full path command (with \w in Bash), that will generate a trimmed pwd that fits to a fixed width.
For example, take a look at this typical path:
$ cd /tmp
$ mkdir -p lorem/ipsum/dolor/sit/amet/consectetur/adipisicing/elit/sed/do/eiusmod
$ PS1='$(spwd -m 40)$ '
/tmp$ cd lorem/ipsum/dolor/sit/
/tmp/lorem/ipsum/dolor/sit$ cd amet/consectetur/adipisicing/elit/
/t/l/i/d/s/a/c/adipisicing/elit$ cd sed/do/eiusmod/
/t/l/i/d/s/a/c/a/elit/sed/do/eiusmod$ pwd
/tmp/lorem/ipsum/dolor/sit/amet/consectetur/adipisicing/elit/sed/do/eiusmod
As you can see, the path parts are reduced to their first letter, until the full string is smaller than 40 characters. The last part is never trimmed. The shortest version of the previous path will be /t/l/i/d/s/a/c/a/e/s/d/eiusmod.
You can force that the minimal path is always used with spwd -m 1.
SPWD is written in plain C to reduce overhead as much as possible.
Clone the repository and compile the program
$ cd /some/path
$ git clone https://github.com/ayosec/spwd.git
$ cd spwd
$ make
Then, edit your shell initialization script (like ~/.bashrc), and make a call to swpd. If your $PS1 variable is defined with something like
export PS1='\u@\h:\w\$ '
You have to replace the \w string with $(/some/path/spwd/spwd -m 40), like
export PS1='\u@\h:$(/some/path/spwd/spwd -m 40)\$ '
Reload the session and enjoy your shorter paths.