So, I've been using home-brew for a little while on my macbook, and I noticed that after I installed a few things with it, my tab completion was REALLY slow.... A little poking around was in order.
First I looked in my ~/.bash_profile, and I saw the following
if [ -f $(brew --prefix)/etc/bash_completion ]; then
. $(brew --prefix)/etc/bash_completion
fi
That pointed me in the direction I needed to go... Lets run the subtle command to see where it points!
MacBook-Pro-2:puppet-sandbox dawiest$ brew --prefix
/usr/local
So lets see how many files (and lines) are contained in those files..
MacBook-Pro-2:bash_completion.d dawiest$ ls /usr/local/etc/bash_completion.d/ | wc -l
186
MacBook-Pro-2:puppet-sandbox dawiest$ find /usr/local/etc/bash_completion{,.d/*} |xargs wc -l | grep total
wc: /usr/local/etc/bash_completion.d/helpers: read: Is a directory
25412 total
Holy smokes! 186 files, with 25k lines! No wonder it takes so long!
After I opened up the list of files in the bash_completion.d/ directory, removed the ones I didn't care about (they are all just symlinks pointing back to ../../Cellar/bash-completion/1.3/etc/bash_completion.d/), my auto-complete's in my shell are noticeably faster!
MacBook-Pro-2:puppet-sandbox dawiest$ ls /usr/local/etc/bash_completion.d/ | wc -l
50
MacBook-Pro-2:puppet-sandbox dawiest$ find /usr/local/etc/bash_completion{,.d/*} |xargs wc -l | grep total
wc: /usr/local/etc/bash_completion.d/helpers: read: Is a directory
14115 total
50 files, and 14k lines to execute, but I think I have removed the biggest offenders. I should figure out a way to profile each of the scripts to see how long they each take to source! It may be better to find the biggest offenders, and remove them if they aren't part of your usual command set.
