Introduce golang support

This includes go vet, golint, and gofmt -e

README.md

@@ -35,6 +35,7 @@ name. That seems to be the fairest way to arrange this table.
 | Cython (pyrex filetype) | [cython](http://cython.org/) |
 | D | [dmd](https://dlang.org/dmd-linux.html)^ |
 | Fortran | [gcc](https://gcc.gnu.org/) |
+| Go | [gofmt -e](https://golang.org/cmd/gofmt/), [go vet](https://golang.org/cmd/vet/), [golint](https://godoc.org/github.com/golang/lint) |
 | Haskell | [ghc](https://www.haskell.org/ghc/) |
 | HTML | [HTMLHint](http://htmlhint.com/), [tidy](http://www.html-tidy.org/) |
 | JavaScript | [eslint](http://eslint.org/), [jscs](http://jscs.info/), [jshint](http://jshint.com/) |

ale_linters/go/gofmt.vim

@@ -0,0 +1,47 @@
+" Author: neersighted <bjorn@neersighted.com>
+" Description: gofmt for Go files
+
+if exists('g:loaded_ale_linters_go_gofmt')
+    finish
+endif
+
+let g:loaded_ale_linters_go_gofmt = 1
+
+function! ale_linters#go#gofmt#Handle(buffer, lines)
+    " Matches patterns line the following:
+    "
+    " file1.go:5:2: expected declaration, found 'STRING' "log"
+    " file2.go:17:2: expected declaration, found 'go'
+    let l:pattern = '^.*:\(\d\+\):\(\d\+\): \(.\+\)$'
+    let l:output = []
+
+    for l:line in a:lines
+        let l:match = matchlist(l:line, l:pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        " vcol is Needed to indicate that the column is a character.
+        call add(l:output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:match[1] + 0,
+        \   'vcol': 0,
+        \   'col': l:match[2] + 0,
+        \   'text': l:match[3],
+        \   'type': 'E',
+        \   'nr': -1,
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('go', {
+\   'name': 'gofmt',
+\   'output_stream': 'stderr',
+\   'executable': 'gofmt',
+\   'command': g:ale#util#stdin_wrapper . ' .go gofmt -e',
+\   'callback': 'ale_linters#go#gofmt#Handle',
+\})
+

ale_linters/go/golint.vim

@@ -0,0 +1,45 @@
+" Author: neersighted <bjorn@neersighted.com>
+" Description: golint for Go files
+
+if exists('g:loaded_ale_linters_go_golint')
+    finish
+endif
+
+let g:loaded_ale_linters_go_golint = 1
+
+function! ale_linters#go#golint#Handle(buffer, lines)
+    " Matches patterns line the following:
+    "
+    " file1.go:53:10: if block ends with a return statement, so drop this else and outdent its block (move short variable declaration to its own line if necessary)
+    " file2.go:67:14: should omit type [][]byte from declaration of var matches; it will be inferred from the right-hand side
+    let l:pattern = '^.*:\(\d\+\):\(\d\+\): \(.\+\)$'
+    let l:output = []
+
+    for l:line in a:lines
+        let l:match = matchlist(l:line, l:pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        " vcol is Needed to indicate that the column is a character.
+        call add(l:output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:match[1] + 0,
+        \   'vcol': 0,
+        \   'col': l:match[2] + 0,
+        \   'text': l:match[3],
+        \   'type': 'W',
+        \   'nr': -1,
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('go', {
+\   'name': 'golint',
+\   'executable': 'golint',
+\   'command': g:ale#util#stdin_wrapper . ' .go golint',
+\   'callback': 'ale_linters#go#golint#Handle',
+\})

ale_linters/go/govet.vim

@@ -0,0 +1,46 @@
+" Author: neersighted <bjorn@neersighted.com>
+" Description: go vet for Go files
+
+if exists('g:loaded_ale_linters_go_govet')
+    finish
+endif
+
+let g:loaded_ale_linters_go_govet = 1
+
+function! ale_linters#go#govet#Handle(buffer, lines)
+    " Matches patterns line the following:
+    "
+    " file.go:27: missing argument for Printf("%s"): format reads arg 2, have only 1 args
+    let l:pattern = '^.*:\(\d\+\): \(.\+\)$'
+    let l:output = []
+
+    for l:line in a:lines
+        let l:match = matchlist(l:line, l:pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        " vcol is Needed to indicate that the column is a character.
+        call add(l:output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:match[1] + 0,
+        \   'vcol': 0,
+        \   'col': 0,
+        \   'text': l:match[2],
+        \   'type': 'W',
+        \   'nr': -1,
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('go', {
+\   'name': 'go vet',
+\   'output_stream': 'stderr',
+\   'executable': 'go',
+\   'command': g:ale#util#stdin_wrapper . ' .go go vet',
+\   'callback': 'ale_linters#go#govet#Handle',
+\})
+