Before

1if has("autocmd")
2 au BufRead,BufNewFile *.wiki set filetype=mediawiki
3 au BufRead,BufNewFile *.wikipedia.org* set filetype=mediawiki
4 au BufRead,BufNewFile *.wikibooks.org* set filetype=mediawiki
5 au BufRead,BufNewFile *.wikimedia.org* set filetype=mediawiki
6endif
7

After

1if has("autocmd")
2 au BufRead,BufNewFile *.wiki set filetype=mediawiki
3 au BufRead,BufNewFile *.mediawiki set filetype=mediawiki
4 au BufRead,BufNewFile *.wikipedia.org* set filetype=mediawiki
5 au BufRead,BufNewFile *.wikibooks.org* set filetype=mediawiki
6 au BufRead,BufNewFile *.wikimedia.org* set filetype=mediawiki
7endif
8

Before

script_file
if_statement
if "if"
call_expression
identifier "has"
( "("
string_literal "\"autocmd\""
) ")"
body
autocmd_statement
autocmd "au"
au_event_list
au_event "BufRead"
, ","
au_event "BufNewFile"
pattern "*.wiki"
set_statement
set "set"
set_item
option_name "filetype"
= "="
set_value "mediawiki"
autocmd_statement
autocmd "au"
au_event_list
au_event "BufRead"
, ","
au_event "BufNewFile"
pattern "*.wikipedia.org*"
set_statement
set "set"
set_item
option_name "filetype"
= "="
set_value "mediawiki"
autocmd_statement
autocmd "au"
au_event_list
au_event "BufRead"
, ","
au_event "BufNewFile"
pattern "*.wikibooks.org*"
set_statement
set "set"
set_item
option_name "filetype"
= "="
set_value "mediawiki"
autocmd_statement
autocmd "au"
au_event_list
au_event "BufRead"
, ","
au_event "BufNewFile"
pattern "*.wikimedia.org*"
set_statement
set "set"
set_item
option_name "filetype"
= "="
set_value "mediawiki"
endif "endif"

After

script_file
if_statement
if "if"
call_expression
identifier "has"
( "("
string_literal "\"autocmd\""
) ")"
body
autocmd_statement
autocmd "au"
au_event_list
au_event "BufRead"
, ","
au_event "BufNewFile"
pattern "*.wiki"
set_statement
set "set"
set_item
option_name "filetype"
= "="
set_value "mediawiki"
autocmd_statement
autocmd "au"
au_event_list
au_event "BufRead"
, ","
au_event "BufNewFile"
pattern "*.mediawiki"
set_statement
set "set"
set_item
option_name "filetype"
= "="
set_value "mediawiki"
autocmd_statement
autocmd "au"
au_event_list
au_event "BufRead"
, ","
au_event "BufNewFile"
pattern "*.wikipedia.org*"
set_statement
set "set"
set_item
option_name "filetype"
= "="
set_value "mediawiki"
autocmd_statement
autocmd "au"
au_event_list
au_event "BufRead"
, ","
au_event "BufNewFile"
pattern "*.wikibooks.org*"
set_statement
set "set"
set_item
option_name "filetype"
= "="
set_value "mediawiki"
autocmd_statement
autocmd "au"
au_event_list
au_event "BufRead"
, ","
au_event "BufNewFile"
pattern "*.wikimedia.org*"
set_statement
set "set"
set_item
option_name "filetype"
= "="
set_value "mediawiki"
endif "endif"