lurkingideas

1. Put your snippets into the file ~/.snips:

   { SUM=0; while read LINE; do SUM=$(($SUM+$LINE)); done; echo $SUM; }
   psql my_curren_project -U postgres
   ls /tmp #list the temp dir
   

2. Create a file which the bash completion will call to filter the file above:

   echo 'grep "$2" ~/.snips' > ~/snip-search
   chmod u+x ~/snip-search
   

3. Register the search script with the bash completion:

   complete -C ~/snip-search snip
   

4. Mask the command out to execute the line from the snip file:

   alias snip=''
   

Test the completion now!

snip temp<TAB>
snip ls /tmp #list the temp dir<ENTER>

httpd                    nsmail.tmp          ssh-pvHTOq1375
keyring-Bb1Hci           orbit-jbar          zim-jbar
liferea.jbar.1742237415  plugtmp
nsmail.html              pulse-Slp1tkJgs3ui

Cool, isn't it?

P.S. There is a readline binding which will look up a command line in your complete bash history: dynamic-complete-history. A very handy feature to be sure. It is even enabled by default but they chose a very unfortunate shortcut for it - Alt+Tab.