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" Try to determine filetype by examining actual file contents; read as little
" as possible, and try to keep things simple and specific to what I typically
" work on, and will expect to be syntax-highlighted.
" Read first line
let s:line = getline(1)
" If it's not a shebang, we're done
if s:line !~# '\m^#!'
finish
endif
" AWK
if s:line =~# '\m\<[gm]\?awk\>'
setfiletype awk
" Perl 5
elseif s:line =~# '\m\<perl\>'
setfiletype perl
" Perl 6
elseif s:line =~# '\m\<perl6\>'
setfiletype perl6
" PHP
elseif s:line =~# '\m\<php\>'
setfiletype php
" Python
elseif s:line =~# '\m\<python[23]\>'
setfiletype python
" sed
elseif s:line =~# '\m\<sed\>'
setfiletype sed
" Bash
elseif s:line =~# '\m\<bash\>'
let b:is_bash = 1
setfiletype sh
" Korn shell
elseif s:line =~# '\m\<\(m\|pd\)\?ksh\(93\)\?\>'
let b:is_kornshell = 1
setfiletype sh
" POSIX/Bourne shell
elseif s:line =~# '\m\<sh\>'
let b:is_posix = 1
setfiletype sh
endif
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