" Vim filetype plugin file
" Language: man
" Maintainer: SungHyun Nam <[email protected]>
" Last Change: 2013 Jul 17

" To make the ":Man" command available before editing a manual page, source
" this script from your startup vimrc file.

" If 'filetype' isn't "man", we must have been called to only define ":Man".
if &filetype == "man"

" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
finish
endif
let b:did_ftplugin = 1

" Ensure Vim is not recursively invoked (man-db does this)
" when doing ctrl-[ on a man page reference.
if exists("$MANPAGER")
let $MANPAGER = ""
endif

" allow dot and dash in manual page name.
setlocal iskeyword+=\.,-

" Add mappings, unless the user didn't want this.
if !exists("no_plugin_maps") && !exists("no_man_maps")
if !hasmapto('<Plug>ManBS')
nmap <buffer> <LocalLeader>h <Plug>ManBS
endif
nnoremap <buffer> <Plug>ManBS :%s/.\b//g<CR>:setl nomod<CR>''

nnoremap <buffer> <c-]> :call <SID>PreGetPage(v:count)<CR>
nnoremap <buffer> <c-t> :call <SID>PopPage()<CR>
endif

let b:undo_ftplugin = "setlocal iskeyword<"

endif

if exists(":Man") != 2
com -nargs=+ Man call s:GetPage(<f-args>)
nmap <Leader>K :call <SID>PreGetPage(0)<CR>
endif

" Define functions only once.
if !exists("s:man_tag_depth")

let s:man_tag_depth = 0

let s:man_sect_arg = ""
let s:man_find_arg = "-w"
try
if !has("win32") && $OSTYPE !~ 'cygwin\|linux' && system('uname -s') =~ "SunOS" && system('uname -r') =~ "^5"
let s:man_sect_arg = "-s"
let s:man_find_arg = "-l"
endif
catch /E145:/
" Ignore the error in restricted mode
endtry

func <SID>PreGetPage(cnt)
if a:cnt == 0
let old_isk = &iskeyword
setl iskeyword+=(,)
let str = expand("<cword>")
let &l:iskeyword = old_isk
let page = substitute(str, '(*\(\k\+\).*', '\1', '')
let sect = substitute(str, '\(\k\+\)(\([^()]*\)).*', '\2', '')
if match(sect, '^[0-9 ]\+$') == -1
let sect = ""
endif
if sect == page
let sect = ""
endif
else
let sect = a:cnt
let page = expand("<cword>")
endif
call s:GetPage(sect, page)
endfunc

func <SID>GetCmdArg(sect, page)
if a:sect == ''
return a:page
endif
return s:man_sect_arg.' '.a:sect.' '.a:page
endfunc

func <SID>FindPage(sect, page)
let where = system("/usr/bin/man ".s:man_find_arg.' '.s:GetCmdArg(a:sect, a:page))
if where !~ "^/"
if matchstr(where, " [^ ]*$") !~ "^ /"
return 0
endif
endif
return 1
endfunc

func <SID>GetPage(...)
if a:0 >= 2
let sect = a:1
let page = a:2
elseif a:0 >= 1
let sect = ""
let page = a:1
else
return
endif

" To support: nmap K :Man <cword>
if page == '<cword>'
let page = expand('<cword>')
endif

if sect != "" && s:FindPage(sect, page) == 0
let sect = ""
endif
if s:FindPage(sect, page) == 0
echo "\nCannot find a '".page."'."
return
endif
exec "let s:man_tag_buf_".s:man_tag_depth." = ".bufnr("%")
exec "let s:man_tag_lin_".s:man_tag_depth." = ".line(".")
exec "let s:man_tag_col_".s:man_tag_depth." = ".col(".")
let s:man_tag_depth = s:man_tag_depth + 1

" Use an existing "man" window if it exists, otherwise open a new one.
if &filetype != "man"
let thiswin = winnr()
exe "norm! \<C-W>b"
if winnr() > 1
exe "norm! " . thiswin . "\<C-W>w"
while 1
if &filetype == "man"
break
endif
exe "norm! \<C-W>w"
if thiswin == winnr()
break
endif
endwhile
endif
if &filetype != "man"
new
setl nonu fdc=0
endif
endif
silent exec "edit $HOME/".page.".".sect."~"
" Avoid warning for editing the dummy file twice
setl buftype=nofile noswapfile

setl ma nonu nornu nofen
silent exec "norm 1GdG"
let $MANWIDTH = winwidth(0)
silent exec "r!/usr/bin/man ".s:GetCmdArg(sect, page)." | col -b"
" Remove blank lines from top and bottom.
while getline(1) =~ '^\s*$'
silent norm ggdd
endwhile
while getline('$') =~ '^\s*$'
silent norm Gdd
endwhile
1
setl ft=man nomod
setl bufhidden=hide
setl nobuflisted
endfunc

func <SID>PopPage()
if s:man_tag_depth > 0
let s:man_tag_depth = s:man_tag_depth - 1
exec "let s:man_tag_buf=s:man_tag_buf_".s:man_tag_depth
exec "let s:man_tag_lin=s:man_tag_lin_".s:man_tag_depth
exec "let s:man_tag_col=s:man_tag_col_".s:man_tag_depth
exec s:man_tag_buf."b"
exec s:man_tag_lin
exec "norm ".s:man_tag_col."|"
exec "unlet s:man_tag_buf_".s:man_tag_depth
exec "unlet s:man_tag_lin_".s:man_tag_depth
exec "unlet s:man_tag_col_".s:man_tag_depth
unlet s:man_tag_buf s:man_tag_lin s:man_tag_col
endif
endfunc

endif

" vim: set sw=2: