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adapt man.vim to work on plan9

	too many hardcoded stuff prevented the plugin to work.
	With this change, it is now possible to run :Man <keyword> and have
	man page displayed properly with colors

--- a/lib/vimfiles/ftplugin/man.vim

+++ b/lib/vimfiles/ftplugin/man.vim

@@ -41,13 +41,8 @@

 let s:man_tag_depth = 0

-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"

-else

-  let s:man_sect_arg = ""

-  let s:man_find_arg = "-w"

-endif

+let s:man_sect_arg = ""

+let s:man_find_arg = "-w"

 func <SID>PreGetPage(cnt)

   if a:cnt == 0

@@ -78,12 +73,12 @@

 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

+"  let where = system("/bin/man ".s:man_find_arg.' '.s:GetCmdArg(a:sect, a:page))

+"  if where !~ "^/"

+"    if matchstr(where, " [^ ]*$") !~ "^ /"

+"      return 0

+"    endif

+"  endif

   return 1

 endfunc

@@ -106,10 +101,10 @@

   if sect != "" && s:FindPage(sect, page) == 0

     let sect = ""

   endif

-  if s:FindPage(sect, page) == 0

-    echo "\nCannot find a '".page."'."

-    return

-  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(".")

@@ -143,7 +138,7 @@

   setl ma

   silent exec "norm 1GdG"

   let $MANWIDTH = winwidth(0)

-  silent exec "r!/usr/bin/man ".s:GetCmdArg(sect, page)." | col -b"

+  silent exec "r!/bin/man ".s:GetCmdArg(sect, page)." | sed 's/^     //' | col -b"

   " Remove blank lines from top and bottom.

   while getline(1) =~ '^\s*$'

     silent norm ggdd