Added new linter for GraphQL: gqlint (#863)

* Added new linter for GraphQL: GQLint

* added help-files

README.md

@@ -84,6 +84,7 @@ name. That seems to be the fairest way to arrange this table.
 | Fortran | [gcc](https://gcc.gnu.org/) |
 | FusionScript | [fusion-lint](https://github.com/RyanSquared/fusionscript) |
 | Go | [gofmt -e](https://golang.org/cmd/gofmt/), [go vet](https://golang.org/cmd/vet/), [golint](https://godoc.org/github.com/golang/lint), [gometalinter](https://github.com/alecthomas/gometalinter), [go build](https://golang.org/cmd/go/), [gosimple](https://github.com/dominikh/go-tools/tree/master/cmd/gosimple), [staticcheck](https://github.com/dominikh/go-tools/tree/master/cmd/staticcheck) |
+| GraphQL | [gqlint](https://github.com/happylinks/gqlint) |
 | Haml | [haml-lint](https://github.com/brigade/haml-lint)
 | Handlebars | [ember-template-lint](https://github.com/rwjblue/ember-template-lint) |
 | Haskell | [ghc](https://www.haskell.org/ghc/), [stack-ghc](https://haskellstack.org/), [stack-build](https://haskellstack.org/), [ghc-mod](https://github.com/DanielG/ghc-mod), [stack-ghc-mod](https://github.com/DanielG/ghc-mod), [hlint](https://hackage.haskell.org/package/hlint), [hdevtools](https://hackage.haskell.org/package/hdevtools) |

ale_linters/graphql/gqlint.vim

@@ -0,0 +1,9 @@
+" Author: Michiel Westerbeek <happylinks@gmail.com>
+" Description: Linter for GraphQL Schemas
+
+call ale#linter#Define('graphql', {
+    \   'name': 'gqlint',
+    \   'executable': 'gqlint',
+    \   'command': 'gqlint --reporter=simple %t',
+    \   'callback': 'ale#handlers#unix#HandleAsWarning',
+\})

doc/ale-graphql.txt

@@ -0,0 +1,9 @@
+===============================================================================
+ALE GraphQL Integration                                   *ale-graphql-options*
+
+
+===============================================================================
+gqlint                                                     *ale-graphql-gqlint*
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale.txt

@@ -43,6 +43,8 @@ CONTENTS                                                         *ale-contents*
       fusion-lint.........................|ale-fuse-fusionlint|
     go....................................|ale-go-options|
       gometalinter........................|ale-go-gometalinter|
+    graphql...............................|ale-graphql-options|
+      gqlint..............................|ale-graphql-gqlint|
     handlebars............................|ale-handlebars-options|
       ember-template-lint.................|ale-handlebars-embertemplatelint|
     haskell...............................|ale-haskell-options|