17 files changed, 124 insertions, 3 deletions

diff --git a/README.md b/README.md
index e8108733..a7b3a22a 100644
--- a/README.md
+++ b/README.md
@@ -171,7 +171,7 @@ formatting.
 | Rust |  cargo !! (see `:help ale-integration-rust` for configuration instructions), [rls](https://github.com/rust-lang-nursery/rls), [rustc](https://www.rust-lang.org/), [rustfmt](https://github.com/rust-lang-nursery/rustfmt) |
 | SASS | [sass-lint](https://www.npmjs.com/package/sass-lint), [stylelint](https://github.com/stylelint/stylelint) |
 | SCSS | [prettier](https://github.com/prettier/prettier), [sass-lint](https://www.npmjs.com/package/sass-lint), [scss-lint](https://github.com/brigade/scss-lint), [stylelint](https://github.com/stylelint/stylelint) |
-| Scala | [fsc](https://www.scala-lang.org/old/sites/default/files/linuxsoft_archives/docu/files/tools/fsc.html), [scalac](http://scala-lang.org), [scalafmt](https://scalameta.org/scalafmt/), [scalastyle](http://www.scalastyle.org) |
+| Scala | [fsc](https://www.scala-lang.org/old/sites/default/files/linuxsoft_archives/docu/files/tools/fsc.html), [sbtserver](https://www.scala-sbt.org/1.x/docs/sbt-server.html), [scalac](http://scala-lang.org), [scalafmt](https://scalameta.org/scalafmt/), [scalastyle](http://www.scalastyle.org)|
 | Slim | [slim-lint](https://github.com/sds/slim-lint) |
 | SML | [smlnj](http://www.smlnj.org/) |
 | Solidity | [solhint](https://github.com/protofire/solhint), [solium](https://github.com/duaraghav8/Solium) |
diff --git a/ale_linters/scala/sbtserver.vim b/ale_linters/scala/sbtserver.vim
new file mode 100644
index 00000000..3092dc13
--- /dev/null
+++ b/ale_linters/scala/sbtserver.vim
@@ -0,0 +1,37 @@
+" Author: ophirr33 <coghlan.ty@gmail.com>
+" Description: TCP lsp client for sbt Server
+
+call ale#Set('scala_sbtserver_address', '')
+call ale#Set('scala_sbtserver_project_root', '')
+
+function! ale_linters#scala#sbtserver#GetProjectRoot(buffer) abort
+    let l:project_root = ale#Var(a:buffer, 'scala_sbtserver_project_root')
+    if l:project_root is? ''
+        let l:project_root = ale#path#FindNearestFile(a:buffer, 'build.sbt')
+        return !empty(l:project_root) ? fnamemodify(l:project_root, ':h') : ''
+    endif
+    return l:project_root
+endfunction
+
+function! ale_linters#scala#sbtserver#GetAddress(buffer) abort
+    let l:address = ale#Var(a:buffer, 'scala_sbtserver_address')
+    if l:address is? ''
+        let l:project_root = ale_linters#scala#sbtserver#GetProjectRoot(a:buffer)
+        let l:active_file = l:project_root . '/project/target/active.json'
+        if !empty(glob(l:active_file))
+            let l:active = json_decode(join(readfile(l:project_root . '/project/target/active.json')))
+            if has_key(l:active, 'uri')
+                return substitute(l:active.uri, 'tcp://', '', '')
+            endif
+        endif
+    endif
+    return l:address
+endfunction
+
+call ale#linter#Define('scala', {
+\   'name': 'sbtserver',
+\   'lsp': 'socket',
+\   'address_callback': 'ale_linters#scala#sbtserver#GetAddress',
+\   'language': 'scala',
+\   'project_root_callback': 'ale_linters#scala#sbtserver#GetProjectRoot',
+\})
diff --git a/autoload/ale/linter.vim b/autoload/ale/linter.vim
index aad386aa..336dfcd0 100644
--- a/autoload/ale/linter.vim
+++ b/autoload/ale/linter.vim
@@ -99,7 +99,7 @@ function! ale#linter#PreProcess(filetype, linter) abort
     endif
 
     if index(['', 'socket', 'stdio', 'tsserver'], l:obj.lsp) < 0
-        throw '`lsp` must be either `''lsp''` or `''tsserver''` if defined'
+        throw '`lsp` must be either `''lsp''`, `''stdio''` or `''tsserver''` if defined'
     endif
 
     if !l:needs_executable
diff --git a/doc/ale-scala.txt b/doc/ale-scala.txt
index b992d428..a50f6267 100644
--- a/doc/ale-scala.txt
+++ b/doc/ale-scala.txt
@@ -3,6 +3,35 @@ ALE Scala Integration                                       *ale-scala-options*
 
 
 ===============================================================================
+sbtserver                                                 *ale-scala-sbtserver*
+
+`sbtserver` requires a running ^1.1.x sbt shell to connect to. It will look
+for this shell by searching upwards from the current working directory for
+the `project/target/active.json` file. This will only work when `sbtserver` is
+configured to listen via tcp. An easy way to accomplish that is to put
+`serverConnectionType := ConnectionType.Tcp` in `~/.sbt/1.0/global.sbt`.
+
+
+g:ale_scala_sbtserver_address                   *g:ale_scala_sbtserver_address*
+                                                *b:ale_scala_sbtserver_address*
+  Type: |String|
+  Default: `''`
+
+  By default the address is found by parsing `active.json`. If the server is
+  running elsewhere, you can override the address here to `host:port`.
+
+
+g:ale_scala_sbtserver_project_root         *g:ale_scala_sbtserver_project_root*
+                                           *b:ale_scala_sbtserver_project_root*
+  Type: |String|
+  Default: `''`
+
+  By default the project root is found by searching upwards for `active.json`.
+  If the project root is elsewhere, you can override the project root
+  directory.
+
+
+===============================================================================
 scalafmt                                                   *ale-scala-scalafmt*
 
 If Nailgun is used, override `g:ale_scala_scalafmt_executable` like so: >
diff --git a/doc/ale.txt b/doc/ale.txt
index 2c018a10..4334510f 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -249,6 +249,7 @@ CONTENTS                                                         *ale-contents*
     sass..................................|ale-sass-options|
       stylelint...........................|ale-sass-stylelint|
     scala.................................|ale-scala-options|
+      sbtserver...........................|ale-scala-sbtserver|
       scalafmt............................|ale-scala-scalafmt|
       scalastyle..........................|ale-scala-scalastyle|
     scss..................................|ale-scss-options|
@@ -430,7 +431,7 @@ Notes:
 * Rust: `cargo`!!, `rls`, `rustc` (see |ale-integration-rust|), `rustfmt`
 * SASS: `sass-lint`, `stylelint`
 * SCSS: `prettier`, `sass-lint`, `scss-lint`, `stylelint`
-* Scala: `fsc`, `scalac`, `scalafmt`, `scalastyle`
+* Scala: `fsc`, `sbtserver`, `scalac`, `scalafmt`, `scalastyle`
 * Slim: `slim-lint`
 * SML: `smlnj`
 * Solidity: `solhint`, `solium`
diff --git a/replace.sh b/replace.sh
new file mode 100755
index 00000000..ae9786c2
--- /dev/null
+++ b/replace.sh
@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+rm -rf ~/.vim/plugged/ale
+cp -r . ~/.vim/plugged/ale
diff --git a/test/command_callback/test_scala_sbtserver.vader b/test/command_callback/test_scala_sbtserver.vader
new file mode 100644
index 00000000..40aacaf4
--- /dev/null
+++ b/test/command_callback/test_scala_sbtserver.vader
@@ -0,0 +1,25 @@
+" Author: ophirr33 <coghlan.ty@gmail.com>
+" Description: Tests for the sbt Server lsp linter
+
+Before:
+  call ale#assert#SetUpLinterTest('scala', 'sbtserver')
+After:
+  call ale#assert#TearDownLinterTest()
+Execute(should set sbtserver for sbt project with active.json):
+  call ale#test#SetFilename('../scala_fixtures/valid_sbt_project/Main.scala')
+  AssertLSPLanguage 'scala'
+  AssertLSPOptions {}
+  AssertLSPProject ale#path#Simplify(g:dir . 'command_callback/../scala_fixtures/valid_sbt_project')
+  AssertLSPAddress '127.0.0.1:5211'
+Execute(should not set sbtserver for sbt project without active.json):
+  call ale#test#SetFilename('../scala_fixtures/no_active_sbt_project/Main.scala')
+  AssertLSPLanguage 'scala'
+  AssertLSPOptions {}
+  AssertLSPProject ale#path#Simplify(g:dir . 'command_callback/../scala_fixtures/no_active_sbt_project')
+  AssertLSPAddress ''
+Execute(should not set sbtserver for sbt project without build.sbt):
+  call ale#test#SetFilename('../scala_fixtures/invalid_sbt_project/Main.scala')
+  AssertLSPLanguage 'scala'
+  AssertLSPOptions {}
+  AssertLSPProject ''
+  AssertLSPAddress ''
diff --git a/test/scala_fixtures/invalid_sbt_project/Main.scala b/test/scala_fixtures/invalid_sbt_project/Main.scala
new file mode 100644
index 00000000..8431ac25
--- /dev/null
+++ b/test/scala_fixtures/invalid_sbt_project/Main.scala
@@ -0,0 +1,5 @@
+object HelloAle {
+  def main(args: Array[String]): Int = {
+    println("Hello, ale!")
+  }
+}
diff --git a/test/scala_fixtures/invalid_sbt_project/project/build.properties b/test/scala_fixtures/invalid_sbt_project/project/build.properties
new file mode 100644
index 00000000..5620cc50
--- /dev/null
+++ b/test/scala_fixtures/invalid_sbt_project/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.2.1
diff --git a/test/scala_fixtures/invalid_sbt_project/project/target/active.json b/test/scala_fixtures/invalid_sbt_project/project/target/active.json
new file mode 100644
index 00000000..0ecdb533
--- /dev/null
+++ b/test/scala_fixtures/invalid_sbt_project/project/target/active.json
@@ -0,0 +1 @@
+{"uri":"tcp://127.0.0.1:5211"}
diff --git a/test/scala_fixtures/no_active_sbt_project/Main.scala b/test/scala_fixtures/no_active_sbt_project/Main.scala
new file mode 100644
index 00000000..8431ac25
--- /dev/null
+++ b/test/scala_fixtures/no_active_sbt_project/Main.scala
@@ -0,0 +1,5 @@
+object HelloAle {
+  def main(args: Array[String]): Int = {
+    println("Hello, ale!")
+  }
+}
diff --git a/test/scala_fixtures/no_active_sbt_project/build.sbt b/test/scala_fixtures/no_active_sbt_project/build.sbt
new file mode 100644
index 00000000..f50b72d2
--- /dev/null
+++ b/test/scala_fixtures/no_active_sbt_project/build.sbt
@@ -0,0 +1,3 @@
+name := "ale-scala-valid"
+version := "1.0"
+scalaVersion := "2.12.6"
diff --git a/test/scala_fixtures/no_active_sbt_project/project/build.properties b/test/scala_fixtures/no_active_sbt_project/project/build.properties
new file mode 100644
index 00000000..5620cc50
--- /dev/null
+++ b/test/scala_fixtures/no_active_sbt_project/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.2.1
diff --git a/test/scala_fixtures/valid_sbt_project/Main.scala b/test/scala_fixtures/valid_sbt_project/Main.scala
new file mode 100644
index 00000000..8431ac25
--- /dev/null
+++ b/test/scala_fixtures/valid_sbt_project/Main.scala
@@ -0,0 +1,5 @@
+object HelloAle {
+  def main(args: Array[String]): Int = {
+    println("Hello, ale!")
+  }
+}
diff --git a/test/scala_fixtures/valid_sbt_project/build.sbt b/test/scala_fixtures/valid_sbt_project/build.sbt
new file mode 100644
index 00000000..f50b72d2
--- /dev/null
+++ b/test/scala_fixtures/valid_sbt_project/build.sbt
@@ -0,0 +1,3 @@
+name := "ale-scala-valid"
+version := "1.0"
+scalaVersion := "2.12.6"
diff --git a/test/scala_fixtures/valid_sbt_project/project/build.properties b/test/scala_fixtures/valid_sbt_project/project/build.properties
new file mode 100644
index 00000000..5620cc50
--- /dev/null
+++ b/test/scala_fixtures/valid_sbt_project/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.2.1
diff --git a/test/scala_fixtures/valid_sbt_project/project/target/active.json b/test/scala_fixtures/valid_sbt_project/project/target/active.json
new file mode 100644
index 00000000..0ecdb533
--- /dev/null
+++ b/test/scala_fixtures/valid_sbt_project/project/target/active.json
@@ -0,0 +1 @@
+{"uri":"tcp://127.0.0.1:5211"}