1 files changed, 146 insertions, 0 deletions
diff --git a/indent/nim.vim b/indent/nim.vim
new file mode 100644
index 00000000..a0eae567
--- /dev/null
+++ b/indent/nim.vim
@@ -0,0 +1,146 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'nim') == -1
+  
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+" Some preliminary settings
+setlocal nolisp         " Make sure lisp indenting doesn't supersede us
+setlocal autoindent     " indentexpr isn't much help otherwise
+
+setlocal indentexpr=GetNimIndent(v:lnum)
+setlocal indentkeys=!^F,o,O,<:>,0),0],0},=elif
+
+" Only define the function once.
+if exists("*GetNimIndent")
+  finish
+endif
+
+function! s:FindStartLine(fromln, pattern)
+  let lnum = a:fromln
+  let safechoice = indent(lnum)
+  while getline(lnum) !~ a:pattern
+    if indent(lnum) == 0 || lnum == 1
+      return safechoice
+    endif
+    let lnum = lnum - 1
+  endwhile
+  return indent(lnum)
+endfunction
+
+function! GetNimIndent(lnum)
+  " Search backwards for the previous non-empty line.
+  let plnum = prevnonblank(a:lnum - 1)
+
+  if plnum == 0
+    " This is the first non-empty line, use zero indent.
+    return 0
+  endif
+
+  " If the start of the line is in a string don't change the indent.
+  if has('syntax_items') && synIDattr(synID(a:lnum, 1, 1), "name") =~ "String$"
+    return -1
+  endif
+
+  let pline = getline(plnum)
+  let cline = getline(a:lnum)
+  let pline_len = strlen(pline)
+  let plindent = indent(plnum)
+  let clindent = indent(a:lnum)
+
+  " Remove any trailing comment from previous line.
+  " Use syntax highlighting attributes when possible.
+  if has('syntax_items')
+    " If the last character in the line is a comment, do a binary search for
+    " the start of the comment.  synID() is slow, a linear search would take
+    " too long on a long line.
+    if synIDattr(synID(plnum, pline_len, 1), "name") =~ "Comment$"
+      let min = 1
+      let max = pline_len
+      while min < max
+        let col = (min + max) / 2
+        if synIDattr(synID(plnum, col, 1), "name") =~ "Comment$"
+          let max = col
+        else
+          let min = col + 1
+        endif
+      endwhile
+      let pline = strpart(pline, 0, min - 1)
+    endif
+  else
+    let col = 0
+    while col < pline_len
+      if pline[col] == '#'
+        let pline = strpart(pline, 0, col)
+        break
+      endif
+      let col = col + 1
+    endwhile
+  endif
+
+  if cline =~ '^\s*\(if\|when\|for\|while\|case\|of\|try\)\>'
+    " This is a benign line, do nothing
+    return -1
+  endif
+
+  " If the current line begins with a keyword that lines up with "try"
+  if cline =~ '^\s*\(except\|finally\)\>'
+    let lnum = a:lnum - 1
+    while lnum >= 1
+      if getline(lnum) =~ '^\s*\(try\|except\)\>'
+        let ind = indent(lnum)
+        if ind >= clindent
+          return -1     " indent is already less than this
+        endif
+        return ind      " line up with previous try or except
+      endif
+      let lnum = lnum - 1
+    endwhile
+    return -1           " no matching "try"!
+  endif
+
+  " If the current line begins with a header keyword, dedent
+  if cline =~ '^\s*\(elif\|else\)\>'
+    return s:FindStartLine(a:lnum, '^\s*\(if\|when\|elif\|of\)')
+  endif
+
+  if pline =~ ':\s*$'
+    "return s:FindStartLine(plnum, '(^\s*\(if\|when\|else\|elif\|case\|of\|try\|except\|finally\)\>)\|\<do\>') + &sw
+    return s:FindStartLine(plnum, '^\s*\(if\|when\|else\|elif\|for\|while\|case\|of\|try\|except\|finally\)\>') + &sw
+  endif
+
+  if pline =~ '=\s*$'
+    return s:FindStartLine(plnum, '^\s*\(proc\|template\|macro\|iterator\)\>') + &sw
+  endif
+
+  " if we got here, this should be the begging of a multi-line if expression for example
+  if pline =~ '^\s*\(if\|when\|proc\|iterator\|macro\|template\|for\|while\)[^:]*$'
+    return plindent + &sw
+  endif
+
+  if pline =~ '\(type\|import\|const\|var\)\s*$'
+    \ || pline =~ '=\s*\(object\|enum\|tuple\|generic\)'
+    return plindent + &sw
+  endif
+
+  " If the previous line was a stop-execution statement...
+  if pline =~ '^\s*\(break\|continue\|raise\|return\)\>'
+    " See if the user has already dedented
+    if indent(a:lnum) > plindent - &sw
+      " If not, recommend one dedent
+      return plindent - &sw
+    endif
+    " Otherwise, trust the user
+    return -1
+  endif
+
+  return -1
+
+endfunction
+
+" vim:sw=2
+
+
+endif