diff --git a/runtime/indent/vhdl.vim b/runtime/indent/vhdl.vim
new file mode 100644
index 0000000..a476d6d
--- /dev/null
+++ b/runtime/indent/vhdl.vim
@@ -0,0 +1,375 @@
+" VHDL indent file ('93 syntax)
+" Language:    VHDL
+" Maintainer:  Gerald Lai <laigera+vim?gmail.com>
+" Credits:     N. J. Heo & Janez Stangelj
+" Version:     1.1
+" Last Change: 2006 Jan 25
+
+" only load this indent file when no other was loaded
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+" setup indent options for local VHDL buffer
+setlocal indentexpr=GetVHDLindent()
+setlocal indentkeys=!^F,o,O,e,0(,0)
+setlocal indentkeys+==~if,=~then,=~elsif,=~else
+setlocal indentkeys+==~begin,=~is,=~select,=~--
+
+" move around
+" keywords: "architecture", "block", "configuration", "component", "entity", "function", "package", "procedure", "process", "record", "units"
+let b:vhdl_explore = '\%(architecture\|block\|configuration\|component\|entity\|function\|package\|procedure\|process\|record\|units\)'
+nnoremap <silent><buffer>[[ :cal search('\%(\<end\s\+\)\@<!\<'.b:vhdl_explore.'\>\c','bW')<CR>
+nnoremap <silent><buffer>]] :cal search('\%(\<end\s\+\)\@<!\<'.b:vhdl_explore.'\>\c','W')<CR>
+nnoremap <silent><buffer>[] :cal search('\<end\s\+'.b:vhdl_explore.'\>\c','bW')<CR>
+nnoremap <silent><buffer>][ :cal search('\<end\s\+'.b:vhdl_explore.'\>\c','W')<CR>
+
+" constants
+" not a comment
+let s:NC = '\%(--.*\)\@<!'
+" end of string
+let s:ES = '\s*\%(--.*\)\=$'
+" no "end" keyword in front
+let s:NE = '\%(\<end\s\+\)\@<!'
+
+" for matchit plugin
+if exists("loaded_matchit")
+  let b:match_ignorecase = 1
+  let b:match_words =
+    \ s:NE.'\<if\>:\<elsif\>:\<else\>:\<end\s\+if\>,'.
+    \ s:NE.'\<case\>:\<when\>:\<end\s\+case\>,'.
+    \ s:NE.'\<loop\>:\<end\s\+loop\>,'.
+    \ s:NE.'\<for\>:\<end\s\+for\>,'.
+    \ s:NE.'\<generate\>:\<end\s\+generate\>,'.
+    \ s:NE.'\<record\>:\<end\s\+record\>,'.
+    \ s:NE.'\<units\>:\<end\s\+units\>,'.
+    \ s:NE.'\<process\>:\<end\s\+process\>,'.
+    \ s:NE.'\<block\>:\<end\s\+block\>,'.
+    \ s:NE.'\<function\>:\<end\s\+function\>,'.
+    \ s:NE.'\<entity\>:\<end\s\+entity\>,'.
+    \ s:NE.'\<component\>:\<end\s\+component\>,'.
+    \ s:NE.'\<architecture\>:\<end\s\+architecture\>,'.
+    \ s:NE.'\<package\>:\<end\s\+package\>,'.
+    \ s:NE.'\<procedure\>:\<end\s\+procedure\>,'.
+    \ s:NE.'\<configuration\>:\<end\s\+configuration\>'
+endif
+
+" only define indent function once
+if exists("*GetVHDLindent")
+  finish
+endif
+
+function GetVHDLindent()
+  " store current line & string
+  let curn = v:lnum
+  let curs = getline(curn)
+
+  " find previous line that is not a comment
+  let prevn = prevnonblank(curn - 1)
+  let prevs = getline(prevn)
+  while prevn > 0 && prevs =~ '^\s*--'
+    let prevn = prevnonblank(prevn - 1)
+    let prevs = getline(prevn)
+  endwhile
+
+  " default indent starts as previous non-comment line's indent
+  let ind = prevn > 0 ? indent(prevn) : 0
+  " backup default
+  let ind2 = ind
+
+  " indent:   previous line's comment position, otherwise follow next non-comment line if possible
+  " keyword:  "--"
+  " where:    start of current line
+  if curs =~ '^\s*--'
+    let pn = curn - 1
+    let ps = getline(pn)
+    if ps =~ '--'
+      return stridx(ps, '--')
+    else
+      " find nextnonblank line that is not a comment
+      let nn = nextnonblank(curn + 1)
+      let ns = getline(nn)
+      while nn > 0 && ns =~ '^\s*--'
+        let nn = nextnonblank(nn + 1)
+        let ns = getline(nn)
+      endwhile
+      let n = indent(nn)
+      return n != -1 ? n : ind
+    endif
+  endif
+
+  " ****************************************************************************************
+  " indent:   align generic variables & port names
+  " keywords: "generic", "map", "port" + "(", provided current line is part of mapping
+  " where:    anywhere in previous 2 lines
+  " find following previous non-comment line
+  let pn = prevnonblank(prevn - 1)
+  let ps = getline(pn)
+  while pn > 0 && ps =~ '^\s*--'
+    let pn = prevnonblank(pn - 1)
+    let ps = getline(pn)
+  endwhile
+  if (curs =~ '^\s*)' || curs =~? s:NC.'\%(\<\%(generic\|map\|port\)\>.*\)\@<!\%(=>\s*\S\+\|:[^=]\@=\s*\%(\%(in\|out\|inout\|buffer\|linkage\)\>\|\w\+\s\+:=\)\)') && (prevs =~? s:NC.'\<\%(generic\|map\|port\)\s*(\%(\s*\w\)\=' || (ps =~? s:NC.'\<\%(generic\|map\|port\)'.s:ES && prevs =~ '^\s*('))
+    " align closing ")" with opening "("
+    if curs =~ '^\s*)'
+      return stridx(prevs, '(')
+    endif
+    let m = matchend(prevs, '(\s*\ze\w')
+    if m != -1
+      return m
+    else
+      return stridx(prevs, '(') + &sw
+    endif
+  endif
+
+  " indent:   align conditional/select statement
+  " keywords: "<=" without ";" ending
+  " where:    anywhere in previous line
+  if prevs =~ s:NC.'<=[^;]*'.s:ES
+    return matchend(prevs, '<=\s*\ze.')
+  endif
+
+  " indent:   backtrace previous non-comment lines for next smaller or equal size indent
+  " keywords: "end" + "record", "units"
+  " where:    start of previous line
+  " keyword:  ")"
+  " where:    start of previous line
+  " keyword:  without "<=" + ";" ending
+  " where:    anywhere in previous line
+  " keyword:  "=>" + ")" ending, provided current line does not begin with ")"
+  " where:    anywhere in previous line
+  " _note_:   indent allowed to leave this filter
+  let m = 0
+  if prevs =~? '^\s*end\s\+\%(record\|units\)\>'
+    let m = 3
+  elseif prevs =~ '^\s*)'
+    let m = 1
+  elseif prevs =~ s:NC.'\%(<=.*\)\@<!;'.s:ES || (curs !~ '^\s*)' && prevs =~ s:NC.'=>.*'.s:NC.')'.s:ES)
+    let m = 2
+  endif
+
+  if m > 0
+    let pn = prevnonblank(prevn - 1)
+    let ps = getline(pn)
+    while pn > 0
+      let t = indent(pn)
+      if ps !~ '^\s*--' && t < ind
+        " make sure one of these is true
+        " keywords: "generic", "map", "port"
+        " where:    anywhere in previous non-comment line
+        " keyword:  "("
+        " where:    start of previous non-comment line
+        " keywords: "<=" without ";" ending
+        " where:    anywhere in previous non-comment line
+        if m < 3 && ps !~ s:NC.'<=[^;]*'.s:ES
+          if ps =~? s:NC.'\<\%(generic\|map\|port\)\>' || ps =~ '^\s*('
+            let ind = t
+          endif
+          break
+        endif
+        let ind = t
+        if m > 1
+          " find following previous non-comment line
+          let ppn = prevnonblank(pn - 1)
+          let pps = getline(ppn)
+          while ppn > 0 && pps =~ '^\s*--'
+            let ppn = prevnonblank(ppn - 1)
+            let pps = getline(ppn)
+          endwhile
+          " indent:   follow
+          " keyword:  "select"
+          " where:    end of following previous non-comment line
+          " keyword:  "type"
+          " where:    start of following previous non-comment line
+          if m == 2
+            let s1 = s:NC.'\<select'.s:ES
+            if ps !~? s1 && pps =~? s1
+              let ind = indent(ppn)
+            endif
+          elseif m == 3
+            let s1 = '^\s*type\>'
+            if ps !~? s1 && pps =~? s1
+              let ind = indent(ppn)
+            endif
+          endif
+        endif
+        break
+      endif
+      let pn = prevnonblank(pn - 1)
+      let ps = getline(pn)
+    endwhile
+  endif
+
+  " indent:   follow indent of previous opening statement, otherwise -sw
+  " keyword:  "begin"
+  " where:    anywhere in current line
+  if curs =~? s:NC.'\<begin\>'
+    let ind = ind - &sw
+    " find previous opening statement of
+    " keywords: "architecture", "block", "entity", "function", "generate", "procedure", "process"
+    let s2 = s:NC.s:NE.'\<\%(architecture\|block\|entity\|function\|generate\|procedure\|process\)\>'
+    if curs !~? s2.'.*'.s:NC.'\<begin\>.*'.s:ES && prevs =~? s2
+      let ind = ind + &sw
+    endif
+    return ind
+  endif
+
+  " indent:   +sw if previous line is previous opening statement
+  " keywords: "record", "units"
+  " where:    anywhere in current line
+  if curs =~? s:NC.s:NE.'\<\%(record\|units\)\>'
+    " find previous opening statement of
+    " keyword: "type"
+    let s3 = s:NC.s:NE.'\<type\>'
+    if curs !~? s3.'.*'.s:NC.'\<\%(record\|units\)\>.*'.s:ES && prevs =~? s3
+      let ind = ind + &sw
+    endif
+    return ind
+  endif
+
+  " ****************************************************************************************
+  " indent:   0
+  " keywords: "architecture", "configuration", "entity", "library", "package"
+  " where:    start of current line
+  if curs =~? '^\s*\%(architecture\|configuration\|entity\|library\|package\)\>'
+    return 0
+  endif
+
+  " indent:   follow indent of previous opening statement
+  " keyword:  "is"
+  " where:    start of current line
+  " find previous opening statement of
+  " keywords: "architecture", "block", "configuration", "entity", "function", "package", "procedure", "process", "type"
+  if curs =~? '^\s*\<is\>' && prevs =~? s:NC.s:NE.'\<\%(architecture\|block\|configuration\|entity\|function\|package\|procedure\|process\|type\)\>'
+    return indent(prevn)
+  endif
+
+  " indent:   follow indent of previous opening statement
+  " keyword:  "then"
+  " where:    start of current line
+  " find previous opening statement of
+  " keywords: "elsif", "if"
+  if curs =~? '^\s*\<then\>' && (prevs =~? s:NC.'\<elsif\>' || prevs =~? s:NC.s:NE.'\<if\>')
+    return indent(prevn)
+  endif
+
+  " indent:   follow indent of previous opening statement
+  " keyword:  "generate"
+  " where:    start of current line
+  " find previous opening statement of
+  " keywords: "for", "if"
+  if curs =~? '^\s*\<generate\>' && (prevs =~? s:NC.'\<for\>' || prevs =~? s:NC.s:NE.'\<if\>')
+    return indent(prevn)
+  endif
+
+  " indent:   +sw
+  " keywords: "block", "for", "loop", "process", "record", "units"
+  " removed:  "case", "if"
+  " where:    anywhere in previous line
+  if prevs =~? s:NC.s:NE.'\<\%(block\|for\|loop\|process\|record\|units\)\>'
+    return ind + &sw
+  endif
+
+  " indent:   +sw
+  " keywords: "begin"
+  " removed:  "elsif", "while"
+  " where:    anywhere in previous line
+  if prevs =~? s:NC.'\<begin\>'
+    return ind + &sw
+  endif
+
+  " indent:   +sw
+  " keywords: "architecture", "component", "configuration", "entity", "package"
+  " removed:  "package", "when", "with"
+  " where:    start of previous line
+  if prevs =~? '^\s*\%(architecture\|component\|configuration\|entity\|package\)\>'
+    return ind + &sw
+  endif
+
+  " indent:   +sw
+  " keyword:  "generate", "is", "select", "=>"
+  " where:    end of previous line
+  if prevs =~? s:NC.'\<\%(generate\|is\|select\)'.s:ES || prevs =~? s:NC.'=>'.s:ES
+    return ind + &sw
+  endif
+
+  " indent:   +sw
+  " keyword:  "else", "then"
+  " where:    end of previous line
+  " _note_:   indent allowed to leave this filter
+  if prevs =~? s:NC.'\<\%(else\|then\)'.s:ES
+    let ind = ind + &sw
+  endif
+
+  " ****************************************************************************************
+  " indent:   -sw if previous line does not begin with "when"
+  " keywords: "when"
+  " where:    start of current line
+  let s4 = '^\s*when\>'
+  if curs =~? s4 && prevs !~? s4
+    return ind - &sw
+  endif
+
+  " indent:   -sw
+  " keywords: "else", "elsif"
+  " where:    start of current line
+  if curs =~? '^\s*\%(else\|elsif\)\>'
+    return ind - &sw
+  endif
+
+  " indent:   -sw
+  " keywords: "end" + "block", "component", "for", "function", "generate", "if", "loop", "procedure", "process", "record", "units"
+  " where:    start of current line
+  " keyword:  ")"
+  " where:    start of current line
+  if curs =~? '^\s*end\s\+\%(block\|component\|for\|function\|generate\|if\|loop\|procedure\|process\|record\|units\)\>' || curs =~ '^\s*)'
+    return ind - &sw
+  endif
+
+  " indent:   backtrace previous non-comment lines; -sw if begin with "when", follow if begin with "case"
+  " keyword:  "end" + "case"
+  " where:    start of current line
+  if curs =~? '^\s*end\s\+case\>'
+    " find following previous non-comment line
+    let pn = prevn
+    let ps = getline(pn)
+    while pn > 0
+      if ps !~ '^\s*--'
+        if ps =~? '^\s*when\>'
+          return indent(pn) - &sw
+        elseif ps =~? '^\s*case\>'
+          return indent(pn)
+        endif
+      endif
+      let pn = prevnonblank(pn - 1)
+      let ps = getline(pn)
+    endwhile
+    return ind
+  endif
+
+  " indent:   0
+  " keywords: "end" + "architecture", "configuration", "entity", "package"
+  " where:    start of current line
+  if curs =~? '^\s*end\s\+\%(architecture\|configuration\|entity\|package\)\>'
+    return 0
+  endif
+
+  " indent:   -sw
+  " keywords: "end" + identifier
+  " where:    start of current line
+  if curs =~? '^\s*end\s\+\w\+\>'
+    return ind - &sw
+  endif
+
+  " ****************************************************************************************
+  " indent:   maintain default
+  " keywords: without "generic", "map", "port" + ":" but not ":=" + "in", "out", "inout", "buffer", "linkage", variable & ":="
+  " where:    anywhere in current line
+  if curs =~? s:NC.'\%(\<\%(generic\|map\|port\)\>.*\)\@<!:[^=]\@=\s*\%(\%(in\|out\|inout\|buffer\|linkage\)\>\|\w\+\s\+:=\)'
+    return ind2
+  endif
+
+  " return leftover filtered indent
+  return ind
+endfunction