1 files changed, 120 insertions, 0 deletions
diff --git a/indent/make.vim b/indent/make.vim
new file mode 100644
index 00000000..35918121
--- /dev/null
+++ b/indent/make.vim
@@ -0,0 +1,120 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim indent file
+" Language:             Makefile
+" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
+" Latest Revision:      2007-05-07
+
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetMakeIndent()
+setlocal indentkeys=!^F,o,O,<:>,=else,=endif
+setlocal nosmartindent
+
+if exists("*GetMakeIndent")
+  finish
+endif
+
+let s:comment_rx = '^\s*#'
+let s:rule_rx = '^[^ \t#:][^#:]*:\{1,2}\%([^=:]\|$\)'
+let s:continued_rule_rx = '^[^#:]*:\{1,2}\%([^=:]\|$\)'
+let s:continuation_rx = '\\$'
+let s:assignment_rx = '^\s*\h\w*\s*[+?]\==\s*\zs.*\\$'
+let s:folded_assignment_rx = '^\s*\h\w*\s*[+?]\=='
+" TODO: This needs to be a lot more restrictive in what it matches.
+let s:just_inserted_rule_rx = '^\s*[^#:]\+:\{1,2}$'
+let s:conditional_directive_rx = '^ *\%(ifn\=\%(eq\|def\)\|else\)\>'
+let s:end_conditional_directive_rx = '^\s*\%(else\|endif\)\>'
+
+function s:remove_continuation(line)
+  return substitute(a:line, s:continuation_rx, "", "")
+endfunction
+
+function GetMakeIndent()
+  " TODO: Should this perhaps be v:lnum -1?
+"  let prev_lnum = prevnonblank(v:lnum - 1)
+  let prev_lnum = v:lnum - 1
+  if prev_lnum == 0
+    return 0
+  endif
+  let prev_line = getline(prev_lnum)
+
+  let prev_prev_lnum = prev_lnum - 1
+  let prev_prev_line = prev_prev_lnum != 0 ? getline(prev_prev_lnum) : ""
+
+  " TODO: Deal with comments.  In comments, continuations aren't interesting.
+  if prev_line =~ s:continuation_rx
+    if prev_prev_line =~ s:continuation_rx
+      return indent(prev_lnum)
+    elseif prev_line =~ s:rule_rx
+      return shiftwidth()
+    elseif prev_line =~ s:assignment_rx
+      call cursor(prev_lnum, 1)
+      if search(s:assignment_rx, 'W') != 0
+        return virtcol('.') - 1
+      else
+        " TODO: ?
+        return shiftwidth()
+      endif
+    else
+      " TODO: OK, this might be a continued shell command, so perhaps indent
+      " properly here?  Leave this out for now, but in the next release this
+      " should be using indent/sh.vim somehow.
+      "if prev_line =~ '^\t' " s:rule_command_rx
+      "  if prev_line =~ '^\s\+[@-]\%(if\)\>'
+      "    return indent(prev_lnum) + 2
+      "  endif
+      "endif
+      return indent(prev_lnum) + shiftwidth()
+    endif
+  elseif prev_prev_line =~ s:continuation_rx
+    let folded_line = s:remove_continuation(prev_prev_line) . ' ' . s:remove_continuation(prev_line)
+    let lnum = prev_prev_lnum - 1
+    let line = getline(lnum)
+    while line =~ s:continuation_rx
+      let folded_line = s:remove_continuation(line) . ' ' . folded_line
+      let lnum -= 1
+      let line = getline(lnum)
+    endwhile
+    let folded_lnum = lnum + 1
+    if folded_line =~ s:rule_rx
+      if getline(v:lnum) =~ s:rule_rx
+        return 0
+      else
+        return &ts
+      endif
+    else
+"    elseif folded_line =~ s:folded_assignment_rx
+      if getline(v:lnum) =~ s:rule_rx
+        return 0
+      else
+        return indent(folded_lnum)
+      endif
+"    else
+"      " TODO: ?
+"      return indent(prev_lnum)
+    endif
+  elseif prev_line =~ s:rule_rx
+    if getline(v:lnum) =~ s:rule_rx
+      return 0
+    else
+      return &ts
+    endif
+  elseif prev_line =~ s:conditional_directive_rx
+    return shiftwidth()
+  else
+    let line = getline(v:lnum)
+    if line =~ s:just_inserted_rule_rx
+      return 0
+    elseif line =~ s:end_conditional_directive_rx
+      return v:lnum - 1 == 0 ? 0 : indent(v:lnum - 1) - shiftwidth()
+    else
+      return v:lnum - 1 == 0 ? 0 : indent(v:lnum - 1)
+    endif
+  endif
+endfunction
+
+endif