1 files changed, 149 insertions, 0 deletions
diff --git a/plugin/polyglot.vim b/plugin/polyglot.vim
new file mode 100644
index 00000000..db2976e6
--- /dev/null
+++ b/plugin/polyglot.vim
@@ -0,0 +1,149 @@
+" Heuristically set expandtab and shiftwidth options
+"
+" Modified version of vim-sleuth:
+"   - tabstop is not set, it's up to user to set it
+"   - check maximum of 32 lines, instead of 1024
+"   - check maximum 6 files, instead of 20
+"   - check maximum of 2 filer per directory level, instead of 8
+"   - check maximum of 3 directory levels
+"   - check only to the nearest .git, .hg, or .svn directory
+"   - globs are concatenated for performance
+if exists('g:polyglot_disabled') && index(g:polyglot_disabled, 'autoindent') != -1
+  finish
+endif
+
+if exists("g:loaded_polyglot") || v:version < 700 || &cp
+  finish
+endif
+
+let g:loaded_sleuth = 1
+let g:loaded_polyglot = 1
+
+function! s:guess(lines) abort
+  let options = {}
+  let ccomment = 0
+  let podcomment = 0
+  let triplequote = 0
+  let backtick = 0
+  let xmlcomment = 0
+  let minindent = 10
+  let spaces_minus_tabs = 0
+
+  for line in a:lines
+    if !len(line) || line =~# '^\s*$'
+      continue
+    endif
+
+    if line =~# '^\s*/\*'
+      let ccomment = 1
+    endif
+    if ccomment
+      if line =~# '\*/'
+        let ccomment = 0
+      endif
+      continue
+    endif
+
+    if line =~# '^=\w'
+      let podcomment = 1
+    endif
+    if podcomment
+      if line =~# '^=\%(end\|cut\)\>'
+        let podcomment = 0
+      endif
+      continue
+    endif
+
+    if triplequote
+      if line =~# '^[^"]*"""[^"]*$'
+        let triplequote = 0
+      endif
+      continue
+    elseif line =~# '^[^"]*"""[^"]*$'
+      let triplequote = 1
+    endif
+
+    if backtick
+      if line =~# '^[^`]*`[^`]*$'
+        let backtick = 0
+      endif
+      continue
+    elseif &filetype ==# 'go' && line =~# '^[^`]*`[^`]*$'
+      let backtick = 1
+    endif
+
+    if line =~# '^\s*<\!--'
+      let xmlcomment = 1
+    endif
+    if xmlcomment
+      if line =~# '-->'
+        let xmlcomment = 0
+      endif
+      continue
+    endif
+
+    let spaces_minus_tabs += line[0] == "\t" ? 1 : -1
+
+    if line[0] == "\t"
+      setlocal noexpandtab
+      return 1
+    elseif line[0] == " "
+      let indent = len(matchstr(line, '^ *'))
+      if indent % 2 == 0 && indent < minindent
+        let minindent = indent
+      endif
+    endif
+  endfor
+
+  if minindent < 10
+    setlocal expandtab
+    let &shiftwidth=minindent
+    return 1
+  endif
+
+  return 0
+endfunction
+
+function! s:detect_indent() abort
+  if &buftype ==# 'help'
+    return
+  endif
+
+  if s:guess(getline(1, 32))
+    return
+  endif
+  let pattern = sleuth#GlobForFiletype(&filetype)
+  if len(pattern) == 0
+    return
+  endif
+  let pattern = '{' . pattern . ',.git,.svn,.hg}'
+  let dir = expand('%:p:h')
+  let level = 3
+  while isdirectory(dir) && dir !=# fnamemodify(dir, ':h') && level > 0
+    for neighbor in glob(dir . '/' . pattern, 0, 1)[0:level]
+      " Do not consider directories above .git, .svn or .hg
+      if fnamemodify(neighbor, ":h:t")[0] == "."
+        return
+      endif
+      if neighbor !=# expand('%:p') && filereadable(neighbor)
+        if s:guess(readfile(neighbor, '', 32))
+          return
+        endif
+      endif
+    endfor
+
+    let dir = fnamemodify(dir, ':h')
+    let level -= 1
+  endwhile
+endfunction
+
+setglobal smarttab
+
+if !exists('g:did_indent_on')
+  filetype indent on
+endif
+
+augroup polyglot
+  autocmd!
+  autocmd FileType * call s:detect_indent()
+augroup END