Added hack linter for php (#239)

* added hack linter

* updated docs for hack (hh_client)

* naming

3 files changed, 39 insertions, 2 deletions

diff --git a/README.md b/README.md
index 07866013..200cc5d9 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,7 @@ name. That seems to be the fairest way to arrange this table.
 | MATLAB | [mlint](https://www.mathworks.com/help/matlab/ref/mlint.html) |
 | OCaml | [merlin](https://github.com/the-lambda-church/merlin) see `:help ale-integration-ocaml-merlin` for configuration instructions
 | Perl | [perl -c](https://perl.org/), [perl-critic](https://metacpan.org/pod/Perl::Critic) |
-| PHP | [php -l](https://secure.php.net/), [phpcs](https://github.com/squizlabs/PHP_CodeSniffer) |
+| PHP | [hack](http://hacklang.org/), [php -l](https://secure.php.net/), [phpcs](https://github.com/squizlabs/PHP_CodeSniffer) |
 | Pug | [pug-lint](https://github.com/pugjs/pug-lint) |
 | Puppet | [puppet](https://puppet.com), [puppet-lint](https://puppet-lint.com) |
 | Python | [flake8](http://flake8.pycqa.org/en/latest/), [pylint](https://www.pylint.org/) |
diff --git a/ale_linters/php/hack.vim b/ale_linters/php/hack.vim
new file mode 100644
index 00000000..bacd835d
--- /dev/null
+++ b/ale_linters/php/hack.vim
@@ -0,0 +1,37 @@
+" Author: Zefei Xuan <https://github.com/zefei>
+" Description: Hack type checking (http://hacklang.org/)
+
+function! ale_linters#php#hack#Handle(buffer, lines)
+    let l:pattern = '^\(.*\):\(\d\+\):\(\d\+\),\(\d\+\): \(.\+])\)$'
+    let l:output = []
+
+    for l:line in a:lines
+        let l:match = matchlist(l:line, l:pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        if a:buffer != bufnr(l:match[1])
+          continue
+        endif
+
+        call add(l:output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:match[2] + 0,
+        \   'vcol': 0,
+        \   'col': l:match[3] + 0,
+        \   'text': l:match[5],
+        \   'type': 'E',
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('php', {
+\   'name': 'hack',
+\   'executable': 'hh_client',
+\   'command': 'hh_client --retries 0 --retry-if-init false',
+\   'callback': 'ale_linters#php#hack#Handle',
+\})
diff --git a/doc/ale.txt b/doc/ale.txt
index 8144267e..6d43ec65 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -84,7 +84,7 @@ The following languages and tools are supported.
 * MATLAB: 'mlint'
 * OCaml: 'merlin' (see |ale-linter-integration-ocaml-merlin|)
 * Perl: 'perl' (-c flag), 'perlcritic'
-* PHP: 'php' (-l flag), 'phpcs'
+* PHP: 'hack', 'php' (-l flag), 'phpcs'
 * Pug: 'pug-lint'
 * Puppet: 'puppet', 'puppet-lint'
 * Python: 'flake8', 'pylint'