Change elm provider, closes #224

10 files changed, 816 insertions, 249 deletions

diff --git a/README.md b/README.md
index bb1239ee..3ccfb00c 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ Most importantly, vim-polyglot contains all runtime syntax files from upstream [
 - [dart](https://github.com/dart-lang/dart-vim-plugin) (syntax, indent, autoload, ftplugin)
 - [dockerfile](https://github.com/docker/docker) (syntax)
 - [elixir](https://github.com/elixir-lang/vim-elixir) (syntax, indent, compiler, autoload, ftplugin)
-- [elm](https://github.com/lambdatoast/elm.vim) (syntax, indent, autoload, ftplugin)
+- [elm](https://github.com/ElmCast/elm-vim) (syntax, indent, autoload, ftplugin)
 - [emberscript](https://github.com/yalesov/vim-ember-script) (syntax, indent, ftplugin)
 - [emblem](https://github.com/yalesov/vim-emblem) (syntax, indent, ftplugin)
 - [erlang](https://github.com/vim-erlang/vim-erlang-runtime) (syntax, indent)
diff --git a/autoload/elm.vim b/autoload/elm.vim
new file mode 100644
index 00000000..85a1a0b2
--- /dev/null
+++ b/autoload/elm.vim
@@ -0,0 +1,382 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'elm') == -1
+  
+let s:errors = []
+
+function! s:elmOracle(...) abort
+	let l:project = finddir('elm-stuff/..', '.;')
+	if len(l:project) == 0
+		echoerr '`elm-stuff` not found! run `elm-package install` for autocomplete.'
+		return []
+	endif
+
+	let l:filename = expand('%:p')
+
+	if a:0 == 0
+		let l:oldiskeyword = &iskeyword
+		" Some non obvious values used in 'iskeyword':
+		"    @     = all alpha
+		"    48-57 = numbers 0 to 9
+		"    @-@   = character @
+		"    124   = |
+		setlocal iskeyword=@,48-57,@-@,_,-,~,!,#,$,%,&,*,+,=,<,>,/,?,.,\\,124,^
+		let l:word = expand('<cword>')
+		let &iskeyword = l:oldiskeyword
+	else
+		let l:word = a:1
+	endif
+
+	let l:infos = elm#Oracle(l:filename, l:word)
+	if v:shell_error != 0
+		call elm#util#EchoError("elm-oracle failed:\n\n", l:infos)
+		return []
+	endif
+
+	let l:d = split(l:infos, '\n')
+	if len(l:d) > 0
+		return elm#util#DecodeJSON(l:d[0])
+	endif
+
+	return []
+endf
+
+" Vim command to format Elm files with elm-format
+function! elm#Format() abort
+	" check for elm-format
+	if elm#util#CheckBin('elm-format', 'https://github.com/avh4/elm-format') ==# ''
+		return
+	endif
+
+	" save cursor position, folds and many other things
+    let l:curw = {}
+    try
+      mkview!
+    catch
+      let l:curw = winsaveview()
+    endtry
+
+    " save our undo file to be restored after we are done.
+    let l:tmpundofile = tempname()
+    exe 'wundo! ' . l:tmpundofile
+
+	" write current unsaved buffer to a temporary file
+	let l:tmpname = tempname() . '.elm'
+	call writefile(getline(1, '$'), l:tmpname)
+
+	" call elm-format on the temporary file
+	let l:out = system('elm-format ' . l:tmpname . ' --output ' . l:tmpname)
+
+	" if there is no error
+	if v:shell_error == 0
+		try | silent undojoin | catch | endtry
+
+		" replace current file with temp file, then reload buffer
+		let l:old_fileformat = &fileformat
+		call rename(l:tmpname, expand('%'))
+		silent edit!
+		let &fileformat = l:old_fileformat
+		let &syntax = &syntax
+	elseif g:elm_format_fail_silently == 0
+		call elm#util#EchoLater('EchoError', 'elm-format:', l:out)
+	endif
+
+    " save our undo history
+    silent! exe 'rundo ' . l:tmpundofile
+    call delete(l:tmpundofile)
+
+	" restore our cursor/windows positions, folds, etc..
+    if empty(l:curw)
+      silent! loadview
+    else
+      call winrestview(l:curw)
+    endif
+endf
+
+" Query elm-oracle and echo the type and docs for the word under the cursor.
+function! elm#ShowDocs() abort
+	" check for the elm-oracle binary
+	if elm#util#CheckBin('elm-oracle', 'https://github.com/elmcast/elm-oracle') ==# ''
+		return
+	endif
+
+	let l:response = s:elmOracle()
+
+	if len(l:response) > 0
+		let l:info = l:response[0]
+		redraws! | echohl Identifier | echon l:info.fullName | echohl None | echon ' : ' | echohl Function | echon l:info.signature | echohl None | echon "\n\n" . l:info.comment
+	else
+		call elm#util#Echo('elm-oracle:', '...no match found')
+	endif
+endf
+
+" Query elm-oracle and open the docs for the word under the cursor.
+function! elm#BrowseDocs() abort
+	" check for the elm-oracle binary
+	if elm#util#CheckBin('elm-oracle', 'https://github.com/elmcast/elm-oracle') ==# ''
+		return
+	endif
+
+	let l:response = s:elmOracle()
+
+	if len(l:response) > 0
+		let l:info = l:response[0]
+		call elm#util#OpenBrowser(l:info.href)
+	else
+		call elm#util#Echo('elm-oracle:', '...no match found')
+	endif
+endf
+
+
+function! elm#Syntastic(input) abort
+	let l:fixes = []
+
+	let l:bin = 'elm-make'
+	let l:format = '--report=json'
+	let l:input = shellescape(a:input)
+	let l:output = '--output=' . shellescape(syntastic#util#DevNull())
+	let l:command = l:bin . ' ' . l:format  . ' ' . l:input . ' ' . l:output
+	let l:reports = s:ExecuteInRoot(l:command)
+
+	for l:report in split(l:reports, '\n')
+		if l:report[0] ==# '['
+            for l:error in elm#util#DecodeJSON(l:report)
+                if g:elm_syntastic_show_warnings == 0 && l:error.type ==? 'warning'
+                else
+                    if a:input == l:error.file
+                        call add(s:errors, l:error)
+                        call add(l:fixes, {'filename': l:error.file,
+                                    \'valid': 1,
+                                    \'bufnr': bufnr('%'),
+                                    \'type': (l:error.type ==? 'error') ? 'E' : 'W',
+                                    \'lnum': l:error.region.start.line,
+                                    \'col': l:error.region.start.column,
+                                    \'text': l:error.overview})
+                    endif
+                endif
+            endfor
+        endif
+	endfor
+
+	return l:fixes
+endf
+
+function! elm#Build(input, output, show_warnings) abort
+	let s:errors = []
+	let l:fixes = []
+	let l:rawlines = []
+
+	let l:bin = 'elm-make'
+	let l:format = '--report=json'
+	let l:input = shellescape(a:input)
+	let l:output = '--output=' . shellescape(a:output)
+	let l:command = l:bin . ' ' . l:format  . ' ' . l:input . ' ' . l:output
+	let l:reports = s:ExecuteInRoot(l:command)
+
+	for l:report in split(l:reports, '\n')
+		if l:report[0] ==# '['
+			for l:error in elm#util#DecodeJSON(l:report)
+				if a:show_warnings == 0 && l:error.type ==? 'warning'
+				else
+					call add(s:errors, l:error)
+					call add(l:fixes, {'filename': l:error.file,
+								\'valid': 1,
+								\'type': (l:error.type ==? 'error') ? 'E' : 'W',
+								\'lnum': l:error.region.start.line,
+								\'col': l:error.region.start.column,
+								\'text': l:error.overview})
+				endif
+			endfor
+		else
+			call add(l:rawlines, l:report)
+		endif
+	endfor
+
+	let l:details = join(l:rawlines, "\n")
+	let l:lines = split(l:details, "\n")
+	if !empty(l:lines)
+		let l:overview = l:lines[0]
+	else
+		let l:overview = ''
+	endif
+
+	if l:details ==# '' || l:details =~? '^Successfully.*'
+	else
+		call add(s:errors, {'overview': l:details, 'details': l:details})
+		call add(l:fixes, {'filename': expand('%', 1),
+					\'valid': 1,
+					\'type': 'E',
+					\'lnum': 0,
+					\'col': 0,
+					\'text': l:overview})
+	endif
+
+	return l:fixes
+endf
+
+" Make the given file, or the current file if none is given.
+function! elm#Make(...) abort
+	if elm#util#CheckBin('elm-make', 'http://elm-lang.org/install') ==# ''
+		return
+	endif
+
+	call elm#util#Echo('elm-make:', 'building...')
+
+	let l:input = (a:0 == 0) ? expand('%:p') : a:1
+	let l:fixes = elm#Build(l:input, g:elm_make_output_file, g:elm_make_show_warnings)
+
+	if len(l:fixes) > 0
+		call elm#util#EchoWarning('', 'found ' . len(l:fixes) . ' errors')
+
+		call setqflist(l:fixes, 'r')
+		cwindow
+
+		if get(g:, 'elm_jump_to_error', 1)
+			ll 1
+		endif
+	else
+		call elm#util#EchoSuccess('', 'Sucessfully compiled')
+
+		call setqflist([])
+		cwindow
+	endif
+endf
+
+" Show the detail of the current error in the quickfix window.
+function! elm#ErrorDetail() abort
+	if !empty(filter(tabpagebuflist(), 'getbufvar(v:val, "&buftype") ==? "quickfix"'))
+		exec ':copen'
+		let l:linenr = line('.')
+		exec ':wincmd p'
+		if len(s:errors) > 0
+			let l:detail = s:errors[l:linenr-1].details
+			if l:detail ==# ''
+				let l:detail = s:errors[l:linenr-1].overview
+			endif
+			echo l:detail
+		endif
+	endif
+endf
+
+" Open the elm repl in a subprocess.
+function! elm#Repl() abort
+	" check for the elm-repl binary
+	if elm#util#CheckBin('elm-repl', 'http://elm-lang.org/install') ==# ''
+		return
+	endif
+
+	if has('nvim')
+		term('elm-repl')
+	else
+		!elm-repl
+	endif
+endf
+
+function! elm#Oracle(filepath, word) abort
+	let l:bin = 'elm-oracle'
+	let l:filepath = shellescape(a:filepath)
+	let l:word = shellescape(a:word)
+	let l:command = l:bin . ' ' . l:filepath . ' ' . l:word
+	return s:ExecuteInRoot(l:command)
+endfunction
+
+let s:fullComplete = ''
+
+" Complete the current token using elm-oracle
+function! elm#Complete(findstart, base) abort
+" a:base is unused, but the callback function for completion expects 2 arguments
+	if a:findstart
+		let l:line = getline('.')
+
+		let l:idx = col('.') - 1
+		let l:start = 0
+		while l:idx > 0 && l:line[l:idx - 1] =~# '[a-zA-Z0-9_\.]'
+			if l:line[l:idx - 1] ==# '.' && l:start == 0
+				let l:start = l:idx
+			endif
+			let l:idx -= 1
+		endwhile
+
+		if l:start == 0
+			let l:start = l:idx
+		endif
+
+		let s:fullComplete = l:line[l:idx : col('.')-2]
+
+		return l:start
+	else
+		" check for the elm-oracle binary
+		if elm#util#CheckBin('elm-oracle', 'https://github.com/elmcast/elm-oracle') ==# ''
+			return []
+		endif
+
+		let l:res = []
+		let l:response = s:elmOracle(s:fullComplete)
+
+		let l:detailed = get(g:, 'elm_detailed_complete', 0)
+
+		for l:r in l:response
+			let l:menu = ''
+			if l:detailed
+				let l:menu = ': ' . l:r.signature
+			endif
+			call add(l:res, {'word': l:r.name, 'menu': l:menu})
+		endfor
+
+		return l:res
+	endif
+endf
+
+" If the current buffer contains a consoleRunner, run elm-test with it.
+" Otherwise run elm-test in the root of your project which deafults to
+" running 'elm-test tests/TestRunner'.
+function! elm#Test() abort
+	if elm#util#CheckBin('elm-test', 'https://github.com/rtfeldman/node-elm-test') ==# ''
+		return
+	endif
+
+	if match(getline(1, '$'), 'consoleRunner') < 0
+		let l:out = s:ExecuteInRoot('elm-test')
+		call elm#util#EchoSuccess('elm-test', l:out)
+	else
+		let l:filepath = shellescape(expand('%:p'))
+		let l:out = s:ExecuteInRoot('elm-test ' . l:filepath)
+		call elm#util#EchoSuccess('elm-test', l:out)
+	endif
+endf
+
+" Returns the closest parent with an elm-package.json file.
+function! elm#FindRootDirectory() abort
+	let l:elm_root = getbufvar('%', 'elmRoot')
+	if empty(l:elm_root)
+		let l:current_file = expand('%:p')
+		let l:dir_current_file = fnameescape(fnamemodify(l:current_file, ':h'))
+		let l:match = findfile('elm-package.json', l:dir_current_file . ';')
+		if empty(l:match)
+			let l:elm_root = ''
+		else
+			let l:elm_root = fnamemodify(l:match, ':p:h')
+		endif
+
+		if !empty(l:elm_root)
+			call setbufvar('%', 'elmRoot', l:elm_root)
+		endif
+	endif
+	return l:elm_root
+endfunction
+
+" Executes a command in the project directory.
+function! s:ExecuteInRoot(cmd) abort
+	let l:cd = exists('*haslocaldir') && haslocaldir() ? 'lcd ' : 'cd '
+	let l:current_dir = getcwd()
+	let l:root_dir = elm#FindRootDirectory()
+
+	try
+		execute l:cd . fnameescape(l:root_dir)
+		let l:out = system(a:cmd)
+	finally
+		execute l:cd . fnameescape(l:current_dir)
+	endtry
+
+	return l:out
+endfunction
+
+endif
diff --git a/autoload/elm/io.vim b/autoload/elm/io.vim
deleted file mode 100644
index 509a8f6a..00000000
--- a/autoload/elm/io.vim
+++ /dev/null
@@ -1,12 +0,0 @@
-if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'elm') == -1
-  
-" System IO
-
-" Craft a system command and run it, returning the output.
-function! elm#io#system(program, args)
-  let cmd ="which " . a:program . " && " . a:program . " " . a:args
-  return system(cmd)
-endfunction
-
-
-endif
diff --git a/autoload/elm/util.vim b/autoload/elm/util.vim
new file mode 100644
index 00000000..b276394c
--- /dev/null
+++ b/autoload/elm/util.vim
@@ -0,0 +1,178 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'elm') == -1
+  
+" IsWin returns 1 if current OS is Windows or 0 otherwise
+fun! elm#util#IsWin() abort
+  let l:win = ['win16', 'win32', 'win32unix', 'win64', 'win95']
+  for l:w in l:win
+    if (has(l:w))
+      return 1
+    endif
+  endfor
+
+  return 0
+endf
+
+fun! elm#util#CheckBin(bin, url) abort
+  let l:binpath = substitute(a:bin, '^\s*\(.\{-}\)\s*$', '\1', '')
+
+  if executable(l:binpath)
+    return l:binpath
+  endif
+
+  call elm#util#EchoWarning('elm-vim:', 'could not find ' . l:binpath . ' [' . a:url . ']')
+
+  return ''
+endf
+
+" Determines the browser command to use
+fun! s:get_browser_command() abort
+  let l:elm_browser_command = get(g:, 'elm_browser_command', '')
+  if l:elm_browser_command ==? ''
+    if elm#util#IsWin()
+      let l:elm_browser_command = '!start rundll32 url.dll,FileProtocolHandler %URL%'
+    elseif has('mac') || has('macunix') || has('gui_macvim') || system('uname') =~? '^darwin'
+      let l:elm_browser_command = 'open %URL%'
+    elseif executable('xdg-open')
+      let l:elm_browser_command = 'xdg-open %URL%'
+    elseif executable('firefox')
+      let l:elm_browser_command = 'firefox %URL% &'
+    else
+      let l:elm_browser_command = ''
+    endif
+  endif
+  return l:elm_browser_command
+endf
+
+" OpenBrowser opens a url in the default browser
+fun! elm#util#OpenBrowser(url) abort
+  let l:cmd = s:get_browser_command()
+  if len(l:cmd) == 0
+    redraw
+    echohl WarningMsg
+    echo "It seems that you don't have general web browser. Open URL below."
+    echohl None
+    echo a:url
+    return
+  endif
+  if l:cmd =~? '^!'
+    let l:cmd = substitute(l:cmd, '%URL%', '\=shellescape(a:url)', 'g')
+    silent! exec l:cmd
+  elseif l:cmd =~# '^:[A-Z]'
+    let l:cmd = substitute(l:cmd, '%URL%', '\=a:url', 'g')
+    exec l:cmd
+  else
+    let l:cmd = substitute(l:cmd, '%URL%', '\=shellescape(a:url)', 'g')
+    call system(l:cmd)
+  endif
+endf
+
+" DecodeJSON decodes a string of json into a viml object
+fun! elm#util#DecodeJSON(s) abort
+  let l:true = 1
+  let l:false = 0
+  let l:null = 0
+  return eval(a:s)
+endf
+
+" Remove ANSI escape characters used for highlighting purposes
+fun! s:strip_color(msg) abort
+  return substitute(a:msg, '\e\[[0-9;]\+[mK]', '', 'g')
+endf
+
+" Print functions
+fun! elm#util#Echo(title, msg) abort
+  redraws! | echon a:title . ' ' | echohl Identifier | echon s:strip_color(a:msg) | echohl None
+endf
+
+fun! elm#util#EchoSuccess(title, msg) abort
+  redraws! | echon a:title . ' ' | echohl Function | echon s:strip_color(a:msg) | echohl None
+endf
+
+fun! elm#util#EchoWarning(title, msg) abort
+  redraws! | echon a:title . ' ' | echohl WarningMsg | echon s:strip_color(a:msg) | echohl None
+endf
+
+fun! elm#util#EchoError(title, msg) abort
+  redraws! | echon a:title . ' ' | echohl ErrorMsg | echon s:strip_color(a:msg) | echohl None
+endf
+
+fun! elm#util#EchoLater(func_name, title, msg) abort
+  let s:echo_func_name = a:func_name
+  let s:echo_title = a:title
+  let s:echo_msg = a:msg
+endf
+
+fun! elm#util#EchoStored() abort
+  if exists('s:echo_func_name') && exists('s:echo_title') && exists('s:echo_msg')
+    call elm#util#{s:echo_func_name}(s:echo_title, s:echo_msg)
+    unlet s:echo_func_name
+    unlet s:echo_title
+    unlet s:echo_msg
+  endif
+endf
+
+function! elm#util#GoToModule(name)
+  if empty(a:name) | return | endif
+  if empty(matchstr(a:name, '^Native\.'))
+    let l:extension = '.elm'
+  else
+    let l:extension = '.js'
+  endif
+  let l:rel_path = substitute(a:name, '\.', '/', 'g') . l:extension
+  let l:root = elm#FindRootDirectory()
+
+  let l:module_file = s:findLocalModule(l:rel_path, l:root)
+  if !filereadable(l:module_file)
+    let l:module_file = s:findDependencyModule(l:rel_path, l:root)
+  endif
+
+  if filereadable(l:module_file)
+    exec 'edit ' . fnameescape(l:module_file)
+  else
+    return s:error("Can't find module \"" . a:name . "\"")
+  endif
+endfunction
+
+function! s:findLocalModule(rel_path, root)
+  let l:package_json = a:root . '/elm-package.json'
+  if exists('*json_decode')
+    let l:package = json_decode(readfile(l:package_json))
+    let l:source_roots = l:package['source-directories']
+  else
+    " This is a fallback for vim's which do not support json_decode.
+    " It simply only looks in the 'src' subdirectory and fails otherwise.
+    let l:source_roots = ['src']
+  end
+  for l:source_root in l:source_roots
+    let l:file_path = a:root . '/' . l:source_root . '/' . a:rel_path
+    if !filereadable(l:file_path)
+      continue
+    endif
+    return l:file_path
+  endfor
+endfunction
+
+function! s:findDependencyModule(rel_path, root)
+  " If we are a dependency ourselves, we need to check our siblings.
+  " This is because elm package doesn't install dependencies recursively.
+  let l:root = substitute(a:root, '\/elm-stuff/packages.\+$', '', '')
+
+  " We naively craws the dependencies dir for any fitting module name.
+  " If it exists, we'll find it. If multiple filenames match,
+  " there's a chance we return the wrong one.
+  let l:module_paths = glob(l:root . '/elm-stuff/packages/**/' . a:rel_path, 0, 1)
+  if len(l:module_paths) > 0
+    return l:module_paths[0]
+  endif
+endfunction
+
+" Using the built-in :echoerr prints a stacktrace, which isn't that nice.
+" From: https://github.com/moll/vim-node/blob/master/autoload/node.vim
+function! s:error(msg)
+	echohl ErrorMsg
+	echomsg a:msg
+	echohl NONE
+	let v:errmsg = a:msg
+endfunction
+
+endif
diff --git a/build b/build
index 376c194a..81d0ddde 100755
--- a/build
+++ b/build
@@ -129,7 +129,7 @@ PACKS="
   dart:dart-lang/dart-vim-plugin
   dockerfile:docker/docker::/contrib/syntax/vim/
   elixir:elixir-lang/vim-elixir
-  elm:lambdatoast/elm.vim
+  elm:ElmCast/elm-vim
   emberscript:yalesov/vim-ember-script
   emblem:yalesov/vim-emblem
   erlang:vim-erlang/vim-erlang-runtime
diff --git a/ftdetect/polyglot.vim b/ftdetect/polyglot.vim
index 6c8553e2..ba1a2d85 100644
--- a/ftdetect/polyglot.vim
+++ b/ftdetect/polyglot.vim
@@ -187,8 +187,10 @@ endfunction
 augroup END
 
 augroup filetypedetect
-" elm:lambdatoast/elm.vim
-au BufNewFile,BufRead *.elm		set filetype=elm
+" elm:ElmCast/elm-vim
+" detection for Elm (http://elm-lang.org/)
+
+au BufRead,BufNewFile *.elm set filetype=elm
 augroup END
 
 augroup filetypedetect
diff --git a/ftplugin/elm.vim b/ftplugin/elm.vim
index 7f121520..180e719c 100644
--- a/ftplugin/elm.vim
+++ b/ftplugin/elm.vim
@@ -1,86 +1,101 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'elm') == -1
   
-" elm.vim - Plugin for the Elm programming language
-" Maintainer:   Alexander Noriega <http://lambdatoast.com/>
-" Version:      0.4.3
+" plugin for Elm (http://elm-lang.org/)
 
-" Plugin setup stuff
-
-if exists("b:did_ftplugin")
+if exists('b:did_ftplugin')
   finish
 endif
 
 let b:did_ftplugin = 1
 
-" Compilation
+" Settings
+if !exists('g:elm_jump_to_error')
+	let g:elm_jump_to_error = 0
+endif
 
-function! ElmMake(file)
-  let args = a:file
-  return elm#io#system("elm-make", args)
-endfunction
+if !exists('g:elm_make_output_file')
+	let g:elm_make_output_file = 'elm.js'
+endif
 
-function! ElmMakeCurrentFile()
-  echo ElmMake(expand("%"))
-endfunction
+if !exists('g:elm_make_show_warnings')
+	let g:elm_make_show_warnings = 0
+endif
 
-function! ElmMakeMain()
-  echo ElmMake("Main.elm")
-endfunction
+if !exists('g:elm_syntastic_show_warnings')
+	let g:elm_syntastic_show_warnings = 0
+endif
 
-function! ElmMakeFile(file)
-  echo ElmMake(a:file)
-endfunction
+if !exists('g:elm_format_autosave')
+	let g:elm_format_autosave = 1
+endif
 
-" REPL
+if !exists('g:elm_format_fail_silently')
+    let g:elm_format_fail_silently = 0
+endif
 
-function! ElmRepl()
-  !elm-repl
-endfunction
+if !exists('g:elm_setup_keybindings')
+	let g:elm_setup_keybindings = 1
+endif
 
-" Evaluation
+setlocal omnifunc=elm#Complete
 
-function! ElmEvalLine()
-  return ElmEval(getline("."))
-endfunction
+setlocal comments=:--
+setlocal commentstring=--\ %s
+
+" Commands
+command -buffer -nargs=? -complete=file ElmMake call elm#Make(<f-args>)
+command -buffer ElmMakeMain call elm#Make("Main.elm")
+command -buffer -nargs=? -complete=file ElmTest call elm#Test(<f-args>)
+command -buffer ElmRepl call elm#Repl()
+command -buffer ElmErrorDetail call elm#ErrorDetail()
+command -buffer ElmShowDocs call elm#ShowDocs()
+command -buffer ElmBrowseDocs call elm#BrowseDocs()
+command -buffer ElmFormat call elm#Format()
+
+if get(g:, 'elm_setup_keybindings', 1)
+  nmap <buffer> <LocalLeader>m <Plug>(elm-make)
+  nmap <buffer> <LocalLeader>b <Plug>(elm-make-main)
+  nmap <buffer> <LocalLeader>t <Plug>(elm-test)
+  nmap <buffer> <LocalLeader>r <Plug>(elm-repl)
+  nmap <buffer> <LocalLeader>e <Plug>(elm-error-detail)
+  nmap <buffer> <LocalLeader>d <Plug>(elm-show-docs)
+  nmap <buffer> <LocalLeader>w <Plug>(elm-browse-docs)
+endif
 
-function! ElmEvalSelection()
-  let savedReg = @z
-  normal! `<v`>"zy
-  let res = ElmEval(substitute(getreg("z"), "\n", "\\\n", "g"))
-  let @z = savedReg
-  normal! gv
-endfunction
+" Better gf command
+nmap <buffer> gf :call elm#util#GoToModule(expand('<cfile>'))<CR>
 
-function! ElmEval(sourceCode)
-  let currentLine = a:sourceCode
-  let args = "echo '" . currentLine . "' | elm-repl"
-  let result = elm#io#system("echo", args)
-  let cleanResult = "-- " . join(s:Filtered(function("s:IsUsefulReplOutput"), split(result, "\n")), "")
-  put =cleanResult
-endfunction
+" Elm code formatting on save
+if get(g:, 'elm_format_autosave', 1)
+  augroup elmFormat
+	autocmd!
+	autocmd BufWritePre *.elm call elm#Format()
+	autocmd BufWritePost *.elm call elm#util#EchoStored()
+   augroup END
+endif
+if has('win32')
+	set viewdir=$HOME/vimfiles/views/
+endif
 
-function! s:IsUsefulReplOutput(str)
-  return a:str !~ "^Elm REPL" && a:str !~ "Type :help" && a:str !~ ">\\s*$"
-endfunction
+" Enable go to file under cursor from module name
+" Based on: https://github.com/elixir-lang/vim-elixir/blob/bd66ed134319d1e390f3331e8c4d525109f762e8/ftplugin/elixir.vim#L22-L56
+function! GetElmFilename(word)
+  let l:word = a:word
 
-" List processing
+  " replace module dots with slash
+  let l:word = substitute(l:word,'\.','/','g')
 
-function! s:Filtered(fn, l)
-    let new_list = deepcopy(a:l)
-    call filter(new_list, string(a:fn) . '(v:val)')
-    return new_list
+  return l:word
 endfunction
 
-command -buffer ElmEvalLine          call ElmEvalLine()
-command -buffer ElmEvalSelection     call ElmEvalSelection()
-command -buffer ElmMakeMain          call ElmMakeMain()
-command -buffer -nargs=1 ElmMakeFile call ElmMakeFile <args>
-command -buffer ElmMakeCurrentFile   call ElmMakeCurrentFile()
-command -buffer ElmRepl              call ElmRepl()
-
-" Define comment convention
-
-setlocal comments=:--
-setlocal commentstring=--%s
+let &l:path =
+      \ join([
+      \   elm#FindRootDirectory().'/src',
+      \   elm#FindRootDirectory().'/elm-stuff/packages/**/src',
+      \   &g:path
+      \ ], ',')
+setlocal includeexpr=GetElmFilename(v:fname)
+setlocal include=^\\s*import\\s\\+
+setlocal suffixesadd=.elm
 
 endif
diff --git a/ftplugin/elm/tagbar.vim b/ftplugin/elm/tagbar.vim
new file mode 100644
index 00000000..1ad3a48b
--- /dev/null
+++ b/ftplugin/elm/tagbar.vim
@@ -0,0 +1,24 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'elm') == -1
+  
+if !executable('ctags')
+    finish
+elseif globpath(&runtimepath, 'plugin/tagbar.vim') ==? ''
+    finish
+endif
+
+function! s:SetTagbar()
+    if !exists('g:tagbar_type_elm')
+        let g:tagbar_type_elm = {
+                    \ 'ctagstype' : 'elm',
+                    \ 'kinds'     : [
+                    \ 'c:constants',
+                    \ 'f:functions',
+                    \ 'p:ports'
+                    \ ]
+                    \ }
+    endif
+endfunction
+
+call s:SetTagbar()
+
+endif
diff --git a/indent/elm.vim b/indent/elm.vim
index 48e96d7e..b8635314 100644
--- a/indent/elm.vim
+++ b/indent/elm.vim
@@ -1,129 +1,115 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'elm') == -1
   
-" Vim indent file
-" Language:     Haskell
-" Maintainer:   lilydjwg <lilydjwg@gmail.com>
-" Version:	1.0
-" References:	http://en.wikibooks.org/wiki/Haskell/Indentation
-" 		http://book.realworldhaskell.org/read/
-" See Also:	The Align plugin http://www.vim.org/scripts/script.php?script_id=294
+" indentation for Elm (http://elm-lang.org/)
 
 " Only load this indent file when no other was loaded.
-if exists("b:did_indent")
-    finish
+if exists('b:did_indent')
+	finish
 endif
 let b:did_indent = 1
 
-setlocal indentexpr=HaskellIndent()
-for i in split('0{,:,0#,e', ',')
-    exec "setlocal indentkeys-=" . i
-endfor
-setlocal indentkeys+=0=else,0=in,0=where,0),0<bar>
-setlocal tabstop=8
+" Local defaults
 setlocal expandtab
+setlocal indentexpr=GetElmIndent()
+setlocal indentkeys+=0=else,0=if,0=of,0=import,0=then,0=type,0\|,0},0\],0),=-},0=in
+setlocal nolisp
+setlocal nosmartindent
 
-if !exists('g:Haskell_no_mapping')
-    inoremap <silent> <BS> <C-R>=<SID>HaskellDedent(1)<CR>
-    inoremap <silent> <C-D> <C-R>=<SID>HaskellDedent(0)<CR>
-endif
+" Comment formatting
+setlocal comments=s1fl:{-,mb:\ ,ex:-},:--
 
-" Only define the functions once.
-if exists("*HaskellIndent")
-    finish
+" Only define the function once.
+if exists('*GetElmIndent')
+	finish
 endif
 
-let s:align_map = {
-            \ 'in': '\<let\>',
-            \ '\<else\>': '\<then\>',
-            \ ',': '\v%(\s|\w|^)@<=[[{]%(\s|\w|"|$)@='
-            \ }
-let s:indent_self = ['=']
-let s:indent_next = ['let', 'in', 'where', 'do', 'if']
-let s:indent_if_final = ['=', 'do', '->', 'of', 'where']
-
-function HaskellIndent()
-    let lnum = v:lnum - 1
-
-    " Hit the start of the file, use zero indent.
-    if lnum == 0
-        return 0
-    endif
-
-    let ind = indent(lnum)
-    let prevline = getline(lnum)
-    let curline = getline(v:lnum)
-    let curwords = split(curline)
-    if len(curwords) > 0
-        if has_key(s:align_map, curwords[0])
-            let word = s:align_map[curwords[0]]
-            let m = -1
-            let line = v:lnum
-            while m == -1
-                let line -= 1
-                if line <= 0
-                    return -1
-                endif
-                let m = match(getline(line), word)
-            endwhile
-            return m
-        elseif index(s:indent_self, curwords[0]) != -1
-            return ind + &sw
-        elseif curwords[0] == '|'
-            return match(prevline, '\v%(\s|\w|^)@<=[|=]%(\s|\w)@=')
-        elseif index([')', '}'], curwords[0]) != -1
-            return ind - &sw
-        elseif curwords[0] == 'where'
-            if prevline =~ '\v^\s+\|%(\s|\w)@='
-                return ind - 1
-            endif
-        endif
-    endif
-
-    let prevwords = split(prevline)
-    if len(prevwords) == 0
-        return 0
-    endif
-
-    if prevwords[-1] == 'where' && prevwords[0] == 'module'
-        return 0
-    elseif index(s:indent_if_final, prevwords[-1]) != -1
-        return ind + &sw
-    elseif prevwords[-1] =~ '\v%(\s|\w|^)@<=[[{(]$'
-        return ind + &sw
-    else
-        for word in reverse(prevwords)
-            if index(s:indent_next, word) != -1
-                return match(prevline, '\<'.word.'\>') + len(word) + 1
-            endif
-        endfor
-    endif
-
-    if len(curwords) > 0 && curwords[0] == 'where'
-        return ind + &sw
-    endif
-
-    return ind
+" Indent pairs
+function! s:FindPair(pstart, pmid, pend)
+	"call search(a:pend, 'bW')
+	return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
 endfunction
 
-function s:HaskellDedent(isbs)
-    if a:isbs && strpart(getline('.'), 0, col('.')-1) !~ '^\s\+$'
-        return "\<BS>"
-    endif
-
-    let curind = indent('.')
-    let line = line('.') - 1
-    while curind > 0 && line > 0
-        let ind = indent(line)
-        if ind >= curind
-            let line -= 1
-        else
-            echomsg curind ind
-            call setline('.', repeat(' ', ind) .
-                        \ substitute(getline('.'), '^\s\+', '', ''))
-            return ''
-        endif
-    endwhile
-    return a:isbs ? "\<BS>" : ''
-endfunction
+function! GetElmIndent()
+	let l:lnum = v:lnum - 1
+
+	" Ident 0 if the first line of the file:
+	if l:lnum == 0
+		return 0
+	endif
+
+	let l:ind = indent(l:lnum)
+	let l:lline = getline(l:lnum)
+	let l:line = getline(v:lnum)
+
+	" Indent if current line begins with '}':
+	if l:line =~? '^\s*}'
+		return s:FindPair('{', '', '}')
+
+	" Indent if current line begins with 'else':
+	elseif l:line =~# '^\s*else\>'
+		if l:lline !~# '^\s*\(if\|then\)\>'
+			return s:FindPair('\<if\>', '', '\<else\>')
+		endif
+
+	" Indent if current line begins with 'then':
+	elseif l:line =~# '^\s*then\>'
+		if l:lline !~# '^\s*\(if\|else\)\>'
+			return s:FindPair('\<if\>', '', '\<then\>')
+		endif
+
+	" HACK: Indent lines in case with nearest case clause:
+	elseif l:line =~# '->' && l:line !~# ':' && l:line !~# '\\'
+		return indent(search('^\s*case', 'bWn')) + &shiftwidth
+
+	" HACK: Don't change the indentation if the last line is a comment.
+	elseif l:lline =~# '^\s*--'
+		return l:ind
+
+	" Align the end of block comments with the start
+	elseif l:line =~# '^\s*-}'
+		return indent(search('{-', 'bWn'))
+
+	" Indent double shift after let with an empty rhs
+	elseif l:lline =~# '\<let\>.*\s=$'
+		return l:ind + 4 + &shiftwidth
+
+	" Align 'in' with the parent let.
+	elseif l:line =~# '^\s*in\>'
+		return indent(search('^\s*let', 'bWn'))
+
+	" Align bindings with the parent let.
+	elseif l:lline =~# '\<let\>'
+		return l:ind + 4
+
+	" Align bindings with the parent in.
+	elseif l:lline =~# '^\s*in\>'
+		return l:ind + 4
+
+	endif
+
+	" Add a 'shiftwidth' after lines ending with:
+	if l:lline =~# '\(|\|=\|->\|<-\|(\|\[\|{\|\<\(of\|else\|if\|then\)\)\s*$'
+		let l:ind = l:ind + &shiftwidth
+
+	" Add a 'shiftwidth' after lines starting with type ending with '=':
+	elseif l:lline =~# '^\s*type' && l:line =~# '^\s*='
+		let l:ind = l:ind + &shiftwidth
+
+	" Back to normal indent after comments:
+	elseif l:lline =~# '-}\s*$'
+		call search('-}', 'bW')
+		let l:ind = indent(searchpair('{-', '', '-}', 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string"'))
+
+	" Ident some operators if there aren't any starting the last line.
+	elseif l:line =~# '^\s*\(!\|&\|(\|`\|+\||\|{\|[\|,\)=' && l:lline !~# '^\s*\(!\|&\|(\|`\|+\||\|{\|[\|,\)=' && l:lline !~# '^\s*$'
+		let l:ind = l:ind + &shiftwidth
+
+	elseif l:lline ==# '' && getline(l:lnum - 1) !=# ''
+		let l:ind = indent(search('^\s*\S+', 'bWn'))
+
+	endif
+
+	return l:ind
+endfunc
 
 endif
diff --git a/syntax/elm.vim b/syntax/elm.vim
index 5825e228..fb3874c0 100644
--- a/syntax/elm.vim
+++ b/syntax/elm.vim
@@ -1,81 +1,73 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'elm') == -1
   
-" Vim syntax file
-" Language: Elm (http://elm-lang.org/)
-" Maintainer: Alexander Noriega
-" Latest Revision: 19 April 2015
+" syntax highlighting for Elm (http://elm-lang.org/)
 
-if exists("b:current_syntax")
+if exists('b:current_syntax')
   finish
 endif
 
 " Keywords
-syn keyword elmKeyword alias as case else exposing if import in let module of port then type where
+syn keyword elmConditional case else if of then
+syn keyword elmAlias alias
+syn keyword elmTypedef type port let in
+syn keyword elmImport exposing as import module where
 
-" Builtin operators
-syn match elmBuiltinOp "\~"
-syn match elmBuiltinOp "||"
-syn match elmBuiltinOp "|>"
-syn match elmBuiltinOp "|"
-syn match elmBuiltinOp "`"
-syn match elmBuiltinOp "\^"
-syn match elmBuiltinOp "\\"
-syn match elmBuiltinOp ">>"
-syn match elmBuiltinOp ">="
-syn match elmBuiltinOp ">"
-syn match elmBuiltinOp "=="
-syn match elmBuiltinOp "="
-syn match elmBuiltinOp "<\~"
-syn match elmBuiltinOp "<|"
-syn match elmBuiltinOp "<="
-syn match elmBuiltinOp "<<"
-syn match elmBuiltinOp "<-"
-syn match elmBuiltinOp "<"
-syn match elmBuiltinOp "::"
-syn match elmBuiltinOp ":"
-syn match elmBuiltinOp "/="
-syn match elmBuiltinOp "//"
-syn match elmBuiltinOp "/"
-syn match elmBuiltinOp "\.\."
-syn match elmBuiltinOp "\."
-syn match elmBuiltinOp "->"
-syn match elmBuiltinOp "-"
-syn match elmBuiltinOp "++"
-syn match elmBuiltinOp "+"
-syn match elmBuiltinOp "*"
-syn match elmBuiltinOp "&&"
-syn match elmBuiltinOp "%"
+" Operators
+syn match elmOperator "\([-!#$%`&\*\+./<=>\?@\\^|~:]\|\<_\>\)"
 
-" Special names
-syntax match specialName "^main "
+" Types
+syn match elmType "\<[A-Z][0-9A-Za-z_'-]*"
+syn keyword elmNumberType number
+
+" Delimiters
+syn match elmDelimiter  "[,;]"
+syn match elmBraces  "[()[\]{}]"
+
+" Functions
+syn match elmTupleFunction "\((,\+)\)"
 
 " Comments
-syn match elmTodo "[tT][oO][dD][oO]\|FIXME\|XXX" contained
+syn keyword elmTodo TODO FIXME XXX contained
 syn match elmLineComment "--.*" contains=elmTodo,@spell
 syn region elmComment matchgroup=elmComment start="{-|\=" end="-}" contains=elmTodo,elmComment,@spell
 
-" String literals
-syn region elmString start="\"" skip="\\\"" end="\"" contains=elmStringEscape
+" Strings
 syn match elmStringEscape "\\u[0-9a-fA-F]\{4}" contained
 syn match elmStringEscape "\\[nrfvbt\\\"]" contained
+syn region elmString start="\"" skip="\\\"" end="\"" contains=elmStringEscape,@spell
+syn region elmTripleString start="\"\"\"" skip="\\\"" end="\"\"\"" contains=elmStringEscape,@spell
+syn match elmChar "'[^'\\]'\|'\\.'\|'\\u[0-9a-fA-F]\{4}'"
 
-" Number literals
-syn match elmNumber "\(\<\d\+\>\)"
-syn match elmNumber "\(\<\d\+\.\d\+\>\)"
+" Numbers
+syn match elmInt "-\?\<\d\+\>\|0[xX][0-9a-fA-F]\+\>"
+syn match elmFloat "\(\<\d\+\.\d\+\>\)"
 
-" Types
-syn match elmType "\<[A-Z][0-9A-Za-z_'-]*"
+" Identifiers
+syn match elmTopLevelDecl "^\s*[a-zA-Z][a-zA-z0-9_]*\('\)*\s\+:\s\+" contains=elmOperator
+
+hi def link elmTopLevelDecl Function
+hi def link elmTupleFunction Normal
+hi def link elmTodo Todo
+hi def link elmComment Comment
+hi def link elmLineComment Comment
+hi def link elmString String
+hi def link elmTripleString String
+hi def link elmChar String
+hi def link elmStringEscape Special
+hi def link elmInt Number
+hi def link elmFloat Float
+hi def link elmDelimiter Delimiter
+hi def link elmBraces Delimiter
+hi def link elmTypedef TypeDef
+hi def link elmImport Include
+hi def link elmConditional Conditional
+hi def link elmAlias Delimiter
+hi def link elmOperator Operator
+hi def link elmType Identifier
+hi def link elmNumberType Identifier
 
-let b:current_syntax = "elm"
+syn sync minlines=500
 
-hi def link elmKeyword            Keyword
-hi def link elmBuiltinOp          Special
-hi def link elmType               Type
-hi def link elmTodo               Todo
-hi def link elmLineComment        Comment
-hi def link elmComment            Comment
-hi def link elmString             String
-hi def link elmNumber             Number
-hi def link specialName           Special
+let b:current_syntax = 'elm'
 
 endif