Add comments and licence.

Make some functions local to script as recommanded in ':help write-plugin'

tslime.vim

@@ -1,3 +1,15 @@
+" Tslime.vim. Send portion of buffer to tmux instance
+" Maintainer: C.Coutinho <kikijump [at] gmail [dot] com>
+" Licence:    DWTFYWTPL
+
+if exists("g:tslime_loaded")
+  finish
+endif
+
+let g:tslime_loaded = 1
+
+" Main function.
+" Use it in your script if you want to send text to a tmux session.
 function! Send_to_Tmux(text)
   if !exists("b:tmux_sessionname") || !exists("b:tmux_windowname")
     if exists("g:tmux_sessionname") && exists("g:tmux_windowname")
@@ -7,7 +19,7 @@ function! Send_to_Tmux(text)
         let b:tmux_panenumber = g:tmux_panenumber
       end
     else
-      call Tmux_Vars()
+      call <SID>Tmux_Vars()
     end
   end
 
@@ -21,19 +33,23 @@ function! Send_to_Tmux(text)
   call system("tmux paste-buffer -t " . target)
 endfunction
 
+" Session completion
 function! Tmux_Session_Names(A,L,P)
   return system("tmux list-sessions | sed -e 's/:.*$//'")
 endfunction
 
+" Window completion
 function! Tmux_Window_Names(A,L,P)
   return system("tmux list-windows -t" . b:tmux_sessionname . ' | grep -e "^\w:" | sed -e "s/ \[[0-9x]*\]$//"')
 endfunction
 
+" Pane completion
 function! Tmux_Pane_Numbers(A,L,P)
   return system("tmux list-panes -t " . b:tmux_sessionname . ":" . b:tmux_windowname . " | sed -e 's/:.*$//'")
 endfunction
 
-function! Tmux_Vars()
+" set tslime.vim variables
+function! s:Tmux_Vars()
   let b:tmux_sessionname = input("session name: ", "", "custom,Tmux_Session_Names")
   let b:tmux_windowname = substitute(input("window name: ", "", "custom,Tmux_Window_Names"), ":.*$" , '', 'g')
 
@@ -55,4 +71,4 @@ endfunction
 vmap <C-c><C-c> "ry :call Send_to_Tmux(@r)<CR>
 nmap <C-c><C-c> vip<C-c><C-c>
 
-nmap <C-c>v :call Tmux_Vars()<CR>
+nmap <C-c>v :call <SID>Tmux_Vars()<CR>