Question

After reading usr_43 in VIM manual, I created ~/.vim/ftplugin

The manual said to check my runtimepath, the result

runtimepath=~/.vim,/var/lib/vim/addons,/usr/share/vim/vimfiles,/usr/share/vim/vim73,/usr/share/vim/vimfiles/after,/var/lib/vim/addons/after,~/.vim/after

Is the ftplugin under the runtimepath, or do I need to add ‘~/.vim/ftplugin’ into the runtimepath?

And then I tried to detect sql3 files:

vim ~/.vim/ftplugin/sqlte3.vim

if exists("b:did_ftplugin")                                                                         
    echo "yes : did_ftpplugin"                                                                            
    finish                                                                                          
elseif                                                                                              
    echo "no : did_ftplugin"                                                                         
endif                                                                                               

let b:did_ftplugin = 1                                                                              

if did_filetype()   
    echo "yes : did_filetype"                                                                                    
    finish                                                                                          
elseif                                                                                              
    echo "no : do file type"                                                                         
endif   

if getline(1) =~ '^#!*[/\\]sqlite3\>'                                                               
    setf sql3                                                                                       
    echo "sqlite3 file"                                                                             
elseif                                                                                              
    echo "not sqlite3 file"                                                                         
endif

after that I did ‘vim ~/test.sql3’

I thought to get some output to verify my workflow, but I get nothing.

How do I get the output from ~/.vim/ftplugin/sqlte3.vim?

Answer 1

Filetype plugin is a wrong place to put code like

if getline(1) =~ '^#!*[/\\]sqlite3\>'
    setf sql3
    echo "sqlite3 file"
elseif

What you should do is to add this to ftdetect/sql3.vim:

autocmd BufRead,BufNewFile * :if getline(1)=~#'^#!.*[/\\]sqlite3\>' | set ft=sql3.vim | endif

. Also note that if you want to have sql3 filetype, then ftplugin must also be named sql3.vim, not sqlite3.vim like in your example. Filename of ftdetect plugin does not really matter, this is just an agreement that for ftdetect files detecting one filetype their name should match detected filetype.