Merge remote-tracking branch 'upstream/master'

37 files changed, 725 insertions, 118 deletions

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 00000000..7c182758
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,23 @@
+name: CI
+on:
+  push:
+    branches: [ master ]
+    tags:
+      - /^v\d+\.\d+\.(x|\d+)$/
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test_ale:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        vim-version:
+          - '--vim-80-only'
+          - '--vim-81-only'
+          - '--neovim-only'
+          - '--linters-only'
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run tests
+        run: ./run-tests -v ${{ matrix.vim-version }}
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 00baff1c..00000000
--- a/.travis.yml
+++ /dev/null
@@ -1,16 +0,0 @@
----
-sudo: required
-services:
-    - docker
-language: generic
-branches:
-  only:
-    - master
-    - /^v\d+\.\d+\.(x|\d+)$/
-env:
-    - OPTIONS=--vim-80-only
-    - OPTIONS=--vim-81-only
-    - OPTIONS=--neovim-only
-    - OPTIONS=--linters-only
-script: |
-    ./run-tests -v $OPTIONS
diff --git a/ale_linters/dart/analysis_server.vim b/ale_linters/dart/analysis_server.vim
new file mode 100644
index 00000000..a6870da9
--- /dev/null
+++ b/ale_linters/dart/analysis_server.vim
@@ -0,0 +1,29 @@
+" Author: Nelson Yeung <nelsyeung@gmail.com>
+" Description: Check Dart files with dart analysis server LSP
+
+call ale#Set('dart_analysis_server_executable', 'dart')
+
+function! ale_linters#dart#analysis_server#GetProjectRoot(buffer) abort
+    " Note: pub only looks for pubspec.yaml, there's no point in adding
+    " support for pubspec.yml
+    let l:pubspec = ale#path#FindNearestFile(a:buffer, 'pubspec.yaml')
+
+    return !empty(l:pubspec) ? fnamemodify(l:pubspec, ':h:h') : '.'
+endfunction
+
+function! ale_linters#dart#analysis_server#GetCommand(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'dart_analysis_server_executable')
+    let l:dart = resolve(exepath(l:executable))
+
+    return '%e '
+    \   . fnamemodify(l:dart, ':h') . '/snapshots/analysis_server.dart.snapshot'
+    \   . ' --lsp'
+endfunction
+
+call ale#linter#Define('dart', {
+\   'name': 'analysis_server',
+\   'lsp': 'stdio',
+\   'executable': {b -> ale#Var(b, 'dart_analysis_server_executable')},
+\   'command': function('ale_linters#dart#analysis_server#GetCommand'),
+\   'project_root': function('ale_linters#dart#analysis_server#GetProjectRoot'),
+\})
diff --git a/ale_linters/javascript/xo.vim b/ale_linters/javascript/xo.vim
index e24f4a82..5e04ad5c 100644
--- a/ale_linters/javascript/xo.vim
+++ b/ale_linters/javascript/xo.vim
@@ -1,26 +1,9 @@
 " Author: Daniel Lupu <lupu.daniel.f@gmail.com>
 " Description: xo for JavaScript files
 
-call ale#Set('javascript_xo_executable', 'xo')
-call ale#Set('javascript_xo_use_global', get(g:, 'ale_use_global_executables', 0))
-call ale#Set('javascript_xo_options', '')
-
-function! ale_linters#javascript#xo#GetExecutable(buffer) abort
-    return ale#node#FindExecutable(a:buffer, 'javascript_xo', [
-    \   'node_modules/.bin/xo',
-    \])
-endfunction
-
-function! ale_linters#javascript#xo#GetCommand(buffer) abort
-    return ale#Escape(ale_linters#javascript#xo#GetExecutable(a:buffer))
-    \   . ' ' . ale#Var(a:buffer, 'javascript_xo_options')
-    \   . ' --reporter json --stdin --stdin-filename %s'
-endfunction
-
-" xo uses eslint and the output format is the same
 call ale#linter#Define('javascript', {
 \   'name': 'xo',
-\   'executable': function('ale_linters#javascript#xo#GetExecutable'),
-\   'command': function('ale_linters#javascript#xo#GetCommand'),
-\   'callback': 'ale#handlers#eslint#HandleJSON',
+\   'executable': function('ale#handlers#xo#GetExecutable'),
+\   'command': function('ale#handlers#xo#GetLintCommand'),
+\   'callback': 'ale#handlers#xo#HandleJSON',
 \})
diff --git a/ale_linters/openapi/ibm_validator.vim b/ale_linters/openapi/ibm_validator.vim
new file mode 100644
index 00000000..446931a2
--- /dev/null
+++ b/ale_linters/openapi/ibm_validator.vim
@@ -0,0 +1,58 @@
+" Author: Horacio Sanson <hsanson@gmail.com>
+
+call ale#Set('openapi_ibm_validator_executable', 'lint-openapi')
+call ale#Set('openapi_ibm_validator_options', '')
+
+function! ale_linters#openapi#ibm_validator#GetCommand(buffer) abort
+    return '%e' . ale#Pad(ale#Var(a:buffer, 'openapi_ibm_validator_options'))
+    \ . ' %t'
+endfunction
+
+function! ale_linters#openapi#ibm_validator#Handle(buffer, lines) abort
+    let l:output = []
+    let l:type = 'E'
+    let l:message = ''
+    let l:nr = -1
+
+    for l:line in a:lines
+        let l:match = matchlist(l:line, '^errors$')
+
+        if !empty(l:match)
+            let l:type = 'E'
+        endif
+
+        let l:match = matchlist(l:line, '^warnings$')
+
+        if !empty(l:match)
+            let l:type = 'W'
+        endif
+
+        let l:match = matchlist(l:line, '^ *Message : *\(.\+\)$')
+
+        if !empty(l:match)
+            let l:message = l:match[1]
+        endif
+
+        let l:match = matchlist(l:line, '^ *Line *: *\(\d\+\)$')
+
+        if !empty(l:match)
+            let l:nr = l:match[1]
+
+            call add(l:output, {
+            \   'lnum': l:nr + 0,
+            \   'col': 0,
+            \   'text': l:message,
+            \   'type': l:type,
+            \})
+        endif
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('openapi', {
+\   'name': 'ibm_validator',
+\   'executable': {b -> ale#Var(b, 'openapi_ibm_validator_executable')},
+\   'command': function('ale_linters#openapi#ibm_validator#GetCommand'),
+\   'callback': 'ale_linters#openapi#ibm_validator#Handle',
+\})
diff --git a/ale_linters/openapi/yamllint.vim b/ale_linters/openapi/yamllint.vim
new file mode 100644
index 00000000..2b8952cc
--- /dev/null
+++ b/ale_linters/openapi/yamllint.vim
@@ -0,0 +1,9 @@
+call ale#Set('yaml_yamllint_executable', 'yamllint')
+call ale#Set('yaml_yamllint_options', '')
+
+call ale#linter#Define('openapi', {
+\   'name': 'yamllint',
+\   'executable': {b -> ale#Var(b, 'yaml_yamllint_executable')},
+\   'command': function('ale#handlers#yamllint#GetCommand'),
+\   'callback': 'ale#handlers#yamllint#Handle',
+\})
diff --git a/ale_linters/typescript/xo.vim b/ale_linters/typescript/xo.vim
index 0a3a717b..6f4ee50c 100644
--- a/ale_linters/typescript/xo.vim
+++ b/ale_linters/typescript/xo.vim
@@ -1,23 +1,6 @@
-call ale#Set('typescript_xo_executable', 'xo')
-call ale#Set('typescript_xo_use_global', get(g:, 'ale_use_global_executables', 0))
-call ale#Set('typescript_xo_options', '')
-
-function! ale_linters#typescript#xo#GetExecutable(buffer) abort
-    return ale#node#FindExecutable(a:buffer, 'typescript_xo', [
-    \   'node_modules/.bin/xo',
-    \])
-endfunction
-
-function! ale_linters#typescript#xo#GetCommand(buffer) abort
-    return ale#Escape(ale_linters#typescript#xo#GetExecutable(a:buffer))
-    \   . ale#Pad(ale#Var(a:buffer, 'typescript_xo_options'))
-    \   . ' --reporter json --stdin --stdin-filename %s'
-endfunction
-
-" xo uses eslint and the output format is the same
 call ale#linter#Define('typescript', {
 \   'name': 'xo',
-\   'executable': function('ale_linters#typescript#xo#GetExecutable'),
-\   'command': function('ale_linters#typescript#xo#GetCommand'),
-\   'callback': 'ale#handlers#eslint#HandleJSON',
+\   'executable': function('ale#handlers#xo#GetExecutable'),
+\   'command': function('ale#handlers#xo#GetLintCommand'),
+\   'callback': 'ale#handlers#xo#HandleJSON',
 \})
diff --git a/ale_linters/vala/vala_lint.vim b/ale_linters/vala/vala_lint.vim
new file mode 100644
index 00000000..7f8a566a
--- /dev/null
+++ b/ale_linters/vala/vala_lint.vim
@@ -0,0 +1,66 @@
+" Author: Atsuya Takagi <asoftonight@gmail.com>
+" Description: A linter for Vala using Vala-Lint.
+
+call ale#Set('vala_vala_lint_config_filename', 'vala-lint.conf')
+call ale#Set('vala_vala_lint_executable', 'io.elementary.vala-lint')
+
+function! ale_linters#vala#vala_lint#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'vala_vala_lint_executable')
+endfunction
+
+function! ale_linters#vala#vala_lint#GetCommand(buffer) abort
+    let l:command = ale_linters#vala#vala_lint#GetExecutable(a:buffer)
+
+    let l:config_filename = ale#Var(a:buffer, 'vala_vala_lint_config_filename')
+    let l:config_path = ale#path#FindNearestFile(a:buffer, l:config_filename)
+
+    if !empty(l:config_path)
+        let l:command .= ' -c ' . l:config_path
+    endif
+
+    return l:command . ' %s'
+endfunction
+
+function! ale_linters#vala#vala_lint#Handle(buffer, lines) abort
+    let l:pattern = '^\s*\(\d\+\)\.\(\d\+\)\s\+\(error\|warn\)\s\+\(.\+\)\s\([A-Za-z0-9_\-]\+\)'
+    let l:output = []
+
+    for l:line in a:lines
+        " remove color escape sequences since vala-lint doesn't support
+        " output without colors
+        let l:cleaned_line = substitute(l:line, '\e\[[0-9;]\+[mK]', '', 'g')
+        let l:match = matchlist(l:cleaned_line, l:pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        let l:refined_type = l:match[3] is# 'warn' ? 'W' : 'E'
+        let l:cleaned_text = substitute(l:match[4], '^\s*\(.\{-}\)\s*$', '\1', '')
+
+        let l:lnum = l:match[1] + 0
+        let l:column = l:match[2] + 0
+        let l:type = l:refined_type
+        let l:text = l:cleaned_text
+        let l:code = l:match[5]
+
+        call add(l:output, {
+        \   'lnum': l:lnum,
+        \   'col': l:column,
+        \   'text': l:text,
+        \   'type': l:type,
+        \   'code': l:code,
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('vala', {
+\   'name': 'vala_lint',
+\   'output_stream': 'stdout',
+\   'executable': function('ale_linters#vala#vala_lint#GetExecutable'),
+\   'command': function('ale_linters#vala#vala_lint#GetCommand'),
+\   'callback': 'ale_linters#vala#vala_lint#Handle',
+\   'lint_file': 1,
+\})
diff --git a/ale_linters/yaml/yamllint.vim b/ale_linters/yaml/yamllint.vim
index bedb7bf1..39011df1 100644
--- a/ale_linters/yaml/yamllint.vim
+++ b/ale_linters/yaml/yamllint.vim
@@ -3,48 +3,9 @@
 call ale#Set('yaml_yamllint_executable', 'yamllint')
 call ale#Set('yaml_yamllint_options', '')
 
-function! ale_linters#yaml#yamllint#GetCommand(buffer) abort
-    return '%e' . ale#Pad(ale#Var(a:buffer, 'yaml_yamllint_options'))
-    \   . ' -f parsable %t'
-endfunction
-
-function! ale_linters#yaml#yamllint#Handle(buffer, lines) abort
-    " Matches patterns line the following:
-    " something.yaml:1:1: [warning] missing document start "---" (document-start)
-    " something.yml:2:1: [error] syntax error: expected the node content, but found '<stream end>'
-    let l:pattern = '\v^.*:(\d+):(\d+): \[(error|warning)\] (.+)$'
-    let l:output = []
-
-    for l:match in ale#util#GetMatches(a:lines, l:pattern)
-        let l:item = {
-        \   'lnum': l:match[1] + 0,
-        \   'col': l:match[2] + 0,
-        \   'text': l:match[4],
-        \   'type': l:match[3] is# 'error' ? 'E' : 'W',
-        \}
-
-        let l:code_match = matchlist(l:item.text, '\v^(.+) \(([^)]+)\)$')
-
-        if !empty(l:code_match)
-            if l:code_match[2] is# 'trailing-spaces'
-            \&& !ale#Var(a:buffer, 'warn_about_trailing_whitespace')
-                " Skip warnings for trailing whitespace if the option is off.
-                continue
-            endif
-
-            let l:item.text = l:code_match[1]
-            let l:item.code = l:code_match[2]
-        endif
-
-        call add(l:output, l:item)
-    endfor
-
-    return l:output
-endfunction
-
 call ale#linter#Define('yaml', {
 \   'name': 'yamllint',
 \   'executable': {b -> ale#Var(b, 'yaml_yamllint_executable')},
-\   'command': function('ale_linters#yaml#yamllint#GetCommand'),
-\   'callback': 'ale_linters#yaml#yamllint#Handle',
+\   'command': function('ale#handlers#yamllint#GetCommand'),
+\   'callback': 'ale#handlers#yamllint#Handle',
 \})
diff --git a/autoload/ale/fix/registry.vim b/autoload/ale/fix/registry.vim
index f514466e..4564954b 100644
--- a/autoload/ale/fix/registry.vim
+++ b/autoload/ale/fix/registry.vim
@@ -102,7 +102,7 @@ let s:default_registry = {
 \   },
 \   'prettier': {
 \       'function': 'ale#fixers#prettier#Fix',
-\       'suggested_filetypes': ['javascript', 'typescript', 'css', 'less', 'scss', 'json', 'json5', 'graphql', 'markdown', 'vue', 'html', 'yaml'],
+\       'suggested_filetypes': ['javascript', 'typescript', 'css', 'less', 'scss', 'json', 'json5', 'graphql', 'markdown', 'vue', 'html', 'yaml', 'openapi'],
 \       'description': 'Apply prettier to a file.',
 \   },
 \   'prettier_eslint': {
diff --git a/autoload/ale/fixers/prettier.vim b/autoload/ale/fixers/prettier.vim
index e0f4972e..12c018af 100644
--- a/autoload/ale/fixers/prettier.vim
+++ b/autoload/ale/fixers/prettier.vim
@@ -83,6 +83,7 @@ function! ale#fixers#prettier#ApplyFixForVersion(buffer, version) abort
         \    'markdown': 'markdown',
         \    'vue': 'vue',
         \    'yaml': 'yaml',
+        \    'openapi': 'yaml',
         \    'html': 'html',
         \}
 
diff --git a/autoload/ale/fixers/xo.vim b/autoload/ale/fixers/xo.vim
index 882350be..dcf4c737 100644
--- a/autoload/ale/fixers/xo.vim
+++ b/autoload/ale/fixers/xo.vim
@@ -1,23 +1,36 @@
 " Author: Albert Marquez - https://github.com/a-marquez
 " Description: Fixing files with XO.
 
-call ale#Set('javascript_xo_executable', 'xo')
-call ale#Set('javascript_xo_use_global', get(g:, 'ale_use_global_executables', 0))
-call ale#Set('javascript_xo_options', '')
+function! ale#fixers#xo#Fix(buffer) abort
+    let l:executable = ale#handlers#xo#GetExecutable(a:buffer)
+    let l:options = ale#handlers#xo#GetOptions(a:buffer)
 
-function! ale#fixers#xo#GetExecutable(buffer) abort
-    return ale#node#FindExecutable(a:buffer, 'javascript_xo', [
-    \   'node_modules/xo/cli.js',
-    \   'node_modules/.bin/xo',
-    \])
+    return ale#semver#RunWithVersionCheck(
+    \   a:buffer,
+    \   l:executable,
+    \   '%e --version',
+    \   {b, v -> ale#fixers#xo#ApplyFixForVersion(b, v, l:executable, l:options)}
+    \)
 endfunction
 
-function! ale#fixers#xo#Fix(buffer) abort
-    let l:executable = ale#fixers#xo#GetExecutable(a:buffer)
+function! ale#fixers#xo#ApplyFixForVersion(buffer, version, executable, options) abort
+    let l:executable = ale#node#Executable(a:buffer, a:executable)
+    let l:options = ale#Pad(a:options)
+
+    " 0.30.0 is the first version with a working --stdin --fix
+    if ale#semver#GTE(a:version, [0, 30, 0])
+        return {
+        \   'command': l:executable
+        \       . ' --stdin --stdin-filename %s'
+        \       . ' --fix'
+        \       . l:options,
+        \}
+    endif
 
     return {
-    \   'command': ale#node#Executable(a:buffer, l:executable)
-    \       . ' --fix %t',
+    \   'command': l:executable
+    \       . ' --fix %t'
+    \       . l:options,
     \   'read_temporary_file': 1,
     \}
 endfunction
diff --git a/autoload/ale/handlers/xo.vim b/autoload/ale/handlers/xo.vim
new file mode 100644
index 00000000..c63278c0
--- /dev/null
+++ b/autoload/ale/handlers/xo.vim
@@ -0,0 +1,44 @@
+call ale#Set('javascript_xo_executable', 'xo')
+call ale#Set('javascript_xo_use_global', get(g:, 'ale_use_global_executables', 0))
+call ale#Set('javascript_xo_options', '')
+
+call ale#Set('typescript_xo_executable', 'xo')
+call ale#Set('typescript_xo_use_global', get(g:, 'ale_use_global_executables', 0))
+call ale#Set('typescript_xo_options', '')
+
+function! ale#handlers#xo#GetExecutable(buffer) abort
+    let l:type = ale#handlers#xo#GetType(a:buffer)
+
+    return ale#node#FindExecutable(a:buffer, l:type . '_xo', [
+    \   'node_modules/xo/cli.js',
+    \   'node_modules/.bin/xo',
+    \])
+endfunction
+
+function! ale#handlers#xo#GetLintCommand(buffer) abort
+    return ale#Escape(ale#handlers#xo#GetExecutable(a:buffer))
+    \   . ale#Pad(ale#handlers#xo#GetOptions(a:buffer))
+    \   . ' --reporter json --stdin --stdin-filename %s'
+endfunction
+
+function! ale#handlers#xo#GetOptions(buffer) abort
+    let l:type = ale#handlers#xo#GetType(a:buffer)
+
+    return ale#Var(a:buffer, l:type . '_xo_options')
+endfunction
+
+" xo uses eslint and the output format is the same
+function! ale#handlers#xo#HandleJSON(buffer, lines) abort
+    return ale#handlers#eslint#HandleJSON(a:buffer, a:lines)
+endfunction
+
+function! ale#handlers#xo#GetType(buffer) abort
+    let l:filetype = getbufvar(a:buffer, '&filetype')
+    let l:type = 'javascript'
+
+    if l:filetype =~# 'typescript'
+        let l:type = 'typescript'
+    endif
+
+    return l:type
+endfunction
diff --git a/autoload/ale/handlers/yamllint.vim b/autoload/ale/handlers/yamllint.vim
new file mode 100644
index 00000000..5e04577d
--- /dev/null
+++ b/autoload/ale/handlers/yamllint.vim
@@ -0,0 +1,39 @@
+function! ale#handlers#yamllint#GetCommand(buffer) abort
+    return '%e' . ale#Pad(ale#Var(a:buffer, 'yaml_yamllint_options'))
+    \   . ' -f parsable %t'
+endfunction
+
+function! ale#handlers#yamllint#Handle(buffer, lines) abort
+    " Matches patterns line the following:
+    " something.yaml:1:1: [warning] missing document start "---" (document-start)
+    " something.yml:2:1: [error] syntax error: expected the node content, but found '<stream end>'
+    let l:pattern = '\v^.*:(\d+):(\d+): \[(error|warning)\] (.+)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        let l:item = {
+        \   'lnum': l:match[1] + 0,
+        \   'col': l:match[2] + 0,
+        \   'text': l:match[4],
+        \   'type': l:match[3] is# 'error' ? 'E' : 'W',
+        \}
+
+        let l:code_match = matchlist(l:item.text, '\v^(.+) \(([^)]+)\)$')
+
+        if !empty(l:code_match)
+            if l:code_match[2] is# 'trailing-spaces'
+            \&& !ale#Var(a:buffer, 'warn_about_trailing_whitespace')
+                " Skip warnings for trailing whitespace if the option is off.
+                continue
+            endif
+
+            let l:item.text = l:code_match[1]
+            let l:item.code = l:code_match[2]
+        endif
+
+        call add(l:output, l:item)
+    endfor
+
+    return l:output
+endfunction
+
diff --git a/doc/ale-dart.txt b/doc/ale-dart.txt
index a6d88dd8..01089252 100644
--- a/doc/ale-dart.txt
+++ b/doc/ale-dart.txt
@@ -3,6 +3,31 @@ ALE Dart Integration                                         *ale-dart-options*
 
 
 ===============================================================================
+analysis_server                                      *ale-dart-analysis_server*
+
+Installation
+-------------------------------------------------------------------------------
+
+Install Dart via whatever means. `analysis_server` will be included in the SDK.
+
+In case that `dart` is not in your path, try to set the executable option to
+its absolute path. : >
+  " Set the executable path for dart to the absolute path to it.
+  let g:ale_dart_analysis_server_executable = '/usr/local/bin/dart'
+<
+
+Options
+-------------------------------------------------------------------------------
+
+g:ale_dart_analysis_server_executable   *g:ale_dart_analysis_server_executable*
+                                        *b:ale_dart_analysis_server_executable*
+  Type: |String|
+  Default: `'dart'`
+
+  This variable can be set to change the path of dart.
+
+
+===============================================================================
 dartanalyzer                                            *ale-dart-dartanalyzer*
 
 Installation
diff --git a/doc/ale-openapi.txt b/doc/ale-openapi.txt
new file mode 100644
index 00000000..1fc41add
--- /dev/null
+++ b/doc/ale-openapi.txt
@@ -0,0 +1,74 @@
+===============================================================================
+ALE OpenApi Integration                                     *ale-openapi-options*
+
+===============================================================================
+ibm_validator                                        *ale-openapi-ibm-validator*
+
+Website: https://github.com/IBM/openapi-validator
+
+
+Installation
+-------------------------------------------------------------------------------
+
+Install ibm-openapi-validator either globally or locally: >
+
+  npm install ibm-openapi-validator -g  # global
+  npm install ibm-openapi-validator     # local
+<
+Configuration
+-------------------------------------------------------------------------------
+
+OpenAPI files can be written in YAML or JSON so in order for ALE plugins to
+work with these files we must set the buffer |filetype| to either |openapi.yaml|
+or |openapi.json| respectively. This causes ALE to lint the file with linters
+configured for openapi and yaml files or openapi and json files respectively.
+
+For example setting filetype to |openapi.yaml| on a buffer and the following
+|g:ale_linters| configuration will enable linting of openapi files using both
+|ibm_validator| and |yamlint|:
+
+>
+  let g:ale_linters = {
+    \   'yaml': ['yamllint'],
+    \   'openapi': ['ibm_validator']
+  \}
+<
+
+The following plugin will detect openapi files automatically and set the
+filetype to |openapi.yaml| or |openapi.json|:
+
+  https://github.com/hsanson/vim-openapi
+
+Options
+-------------------------------------------------------------------------------
+
+g:ale_openapi_ibm_validator_executable   *g:ale_openapi_ibm_validator_executable*
+                                         *b:ale_openapi_ibm_validator_executable*
+  Type: |String|
+  Default: `'lint-openapi'`
+
+  This variable can be set to change the path to lint-openapi.
+
+
+g:ale_openapi_ibm_validator_options       *g:ale_openapi_ibm_validator_options*
+                                          *b:ale_openapi_ibm_validator_options*
+  Type: |String|
+  Default: `''`
+
+  This variable can be set to pass additional options to lint-openapi.
+
+
+===============================================================================
+prettier                                                   *ale-openapi-prettier*
+
+See |ale-javascript-prettier| for information about the available options.
+
+
+===============================================================================
+yamllint                                                  *ale-openapi-yamllint*
+
+See |ale-yaml-yamllint| for information about the available options.
+
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:
diff --git a/doc/ale-supported-languages-and-tools.txt b/doc/ale-supported-languages-and-tools.txt
index d06508c5..c3ab3690 100644
--- a/doc/ale-supported-languages-and-tools.txt
+++ b/doc/ale-supported-languages-and-tools.txt
@@ -117,6 +117,7 @@ Notes:
 * Dafny
   * `dafny`!!
 * Dart
+  * `analysis_server`
   * `dartanalyzer`!!
   * `dartfmt`!!
   * `language_server`
@@ -323,6 +324,10 @@ Notes:
   * `ocamlformat`
   * `ocp-indent`
   * `ols`
+* OpenApi
+  * `ibm_validator`
+  * `prettier`
+  * `yamllint`
 * Pawn
   * `uncrustify`
 * Perl
@@ -502,6 +507,7 @@ Notes:
   * `typecheck`
 * VALA
   * `uncrustify`
+  * `vala_lint`!!
 * Verilog
   * `hdl-checker`
   * `iverilog`
diff --git a/doc/ale-typescript.txt b/doc/ale-typescript.txt
index 2c50d119..026d17ce 100644
--- a/doc/ale-typescript.txt
+++ b/doc/ale-typescript.txt
@@ -139,4 +139,31 @@ g:ale_typescript_tsserver_use_global     *g:ale_typescript_tsserver_use_global*
 
 
 ===============================================================================
+xo                                                          *ale-typescript-xo*
+
+g:ale_typescript_xo_executable                 *g:ale_typescript_xo_executable*
+                                               *b:ale_typescript_xo_executable*
+  Type: |String|
+  Default: `'xo'`
+
+  See |ale-integrations-local-executables|
+
+
+g:ale_typescript_xo_options                       *g:ale_typescript_xo_options*
+                                                  *b:ale_typescript_xo_options*
+  Type: |String|
+  Default: `''`
+
+  This variable can be set to pass additional options to xo.
+
+
+g:ale_typescript_xo_use_global                 *g:ale_typescript_xo_use_global*
+                                               *b:ale_typescript_xo_use_global*
+  Type: |Number|
+  Default: `get(g:, 'ale_use_global_executables', 0)`
+
+  See |ale-integrations-local-executables|
+
+
+===============================================================================
   vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:
diff --git a/doc/ale-vala.txt b/doc/ale-vala.txt
index ca24bcf4..d48f68bb 100644
--- a/doc/ale-vala.txt
+++ b/doc/ale-vala.txt
@@ -9,4 +9,25 @@ See |ale-c-uncrustify| for information about the available options.
 
 
 ===============================================================================
+Vala-Lint                                                  *ale-vala-vala-lint*
+
+g:vala_vala_lint_executable                       *g:vala_vala_lint_executable*
+                                                  *b:vala_vala_lint_executable*
+  Type: |String|
+  Default: `'io.elementary.vala-lint'`
+
+  This variable can be set to specify a Vala-Lint executable file.
+
+
+g:vala_vala_lint_config_filename             *g:vala_vala_lint_config_filename*
+                                             *b:vala_vala_lint_config_filename*
+  Type: |String|
+  Default: `'vala-lint.conf'`
+
+  This variable can be set to specify a Vala-Lint config filename. When a file
+  with the specified name was not found or this variable was set to empty,
+  Vala-Lint will be executed without specifying a config filename.
+
+
+===============================================================================
 vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:
diff --git a/doc/ale.txt b/doc/ale.txt
index ce01638f..d5ea82ca 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -2665,6 +2665,7 @@ documented in additional help files.
   dafny...................................|ale-dafny-options|
     dafny.................................|ale-dafny-dafny|
   dart....................................|ale-dart-options|
+    analysis_server.......................|ale-dart-analysis_server|
     dartanalyzer..........................|ale-dart-dartanalyzer|
     dartfmt...............................|ale-dart-dartfmt|
   dhall...................................|ale-dhall-options|
@@ -2836,6 +2837,10 @@ documented in additional help files.
     ols...................................|ale-ocaml-ols|
     ocamlformat...........................|ale-ocaml-ocamlformat|
     ocp-indent............................|ale-ocaml-ocp-indent|
+  openapi.................................|ale-openapi-options|
+    ibm_validator.........................|ale-openapi-ibm-validator|
+    prettier..............................|ale-openapi-prettier|
+    yamllint..............................|ale-openapi-yamllint|
   pawn....................................|ale-pawn-options|
     uncrustify............................|ale-pawn-uncrustify|
   perl....................................|ale-perl-options|
@@ -2994,6 +2999,7 @@ documented in additional help files.
     standard..............................|ale-typescript-standard|
     tslint................................|ale-typescript-tslint|
     tsserver..............................|ale-typescript-tsserver|
+    xo....................................|ale-typescript-xo|
   vala....................................|ale-vala-options|
     uncrustify............................|ale-vala-uncrustify|
   verilog/systemverilog...................|ale-verilog-options|
diff --git a/supported-tools.md b/supported-tools.md
index 8eebed10..31d07562 100644
--- a/supported-tools.md
+++ b/supported-tools.md
@@ -126,6 +126,7 @@ formatting.
 * Dafny
   * [dafny](https://rise4fun.com/Dafny) :floppy_disk:
 * Dart
+  * [analysis_server](https://github.com/dart-lang/sdk/tree/master/pkg/analysis_server)
   * [dartanalyzer](https://github.com/dart-lang/sdk/tree/master/pkg/analyzer_cli) :floppy_disk:
   * [dartfmt](https://github.com/dart-lang/sdk/tree/master/utils/dartfmt)
   * [language_server](https://github.com/natebosch/dart_language_server)
@@ -332,6 +333,10 @@ formatting.
   * [ocamlformat](https://github.com/ocaml-ppx/ocamlformat)
   * [ocp-indent](https://github.com/OCamlPro/ocp-indent)
   * [ols](https://github.com/freebroccolo/ocaml-language-server)
+* OpenApi
+  * [ibm_validator](https://github.com/IBM/openapi-validator)
+  * [prettier](https://github.com/prettier/prettier)
+  * [yamllint](https://yamllint.readthedocs.io/)
 * Pawn
   * [uncrustify](https://github.com/uncrustify/uncrustify)
 * Perl
@@ -511,6 +516,7 @@ formatting.
   * typecheck
 * VALA
   * [uncrustify](https://github.com/uncrustify/uncrustify)
+  * [vala_lint](https://github.com/vala-lang/vala-lint) :floppy_disk:
 * Verilog
   * [hdl-checker](https://pypi.org/project/hdl-checker)
   * [iverilog](https://github.com/steveicarus/iverilog)
diff --git a/test/command_callback/test_dart_analysis_server_command_callback.vader b/test/command_callback/test_dart_analysis_server_command_callback.vader
new file mode 100644
index 00000000..1754109a
--- /dev/null
+++ b/test/command_callback/test_dart_analysis_server_command_callback.vader
@@ -0,0 +1,15 @@
+Before:
+  call ale#assert#SetUpLinterTest('dart', 'analysis_server')
+
+After:
+  call ale#assert#TearDownLinterTest()
+
+Execute(The default command should be correct):
+  AssertLinter 'dart', ale#Escape('dart')
+  \   . ' ./snapshots/analysis_server.dart.snapshot --lsp'
+
+Execute(The executable should be configurable):
+  let g:ale_dart_analysis_server_executable = 'foobar'
+
+  AssertLinter 'foobar', ale#Escape('foobar')
+  \   . ' ./snapshots/analysis_server.dart.snapshot --lsp'
diff --git a/test/command_callback/test_ibm_openapi_validator_command_callback.vader b/test/command_callback/test_ibm_openapi_validator_command_callback.vader
new file mode 100644
index 00000000..3484cc09
--- /dev/null
+++ b/test/command_callback/test_ibm_openapi_validator_command_callback.vader
@@ -0,0 +1,15 @@
+Before:
+  call ale#assert#SetUpLinterTest('openapi', 'ibm_validator')
+
+After:
+  call ale#assert#TearDownLinterTest()
+
+Execute(The yaml ibm-openapi-validator command callback should return the correct default string):
+  AssertLinter 'lint-openapi', ale#Escape('lint-openapi') . ' %t'
+
+Execute(The yaml ibm-openapi-validator command callback should be configurable):
+  let g:ale_openapi_ibm_validator_executable = '~/.local/bin/lint-openapi'
+  let g:ale_openapi_ibm_validator_options = '-c ~/.config'
+
+  AssertLinter '~/.local/bin/lint-openapi', ale#Escape('~/.local/bin/lint-openapi')
+  \ . ' -c ~/.config %t'
diff --git a/test/command_callback/test_xo_command_callback.vader b/test/command_callback/test_xo_command_callback.vader
index 65cb4f8a..1aa4c3f1 100644
--- a/test/command_callback/test_xo_command_callback.vader
+++ b/test/command_callback/test_xo_command_callback.vader
@@ -1,8 +1,11 @@
 Before:
-  call ale#assert#SetUpLinterTest('typescript', 'xo')
-  call ale#test#SetFilename('testfile.ts')
+  call ale#assert#SetUpLinterTest('javascript', 'xo')
+  call ale#test#SetFilename('testfile.jsx')
   unlet! b:executable
 
+  set filetype=javascriptreact
+  runtime autoload/ale/handlers/xo.vim
+
 After:
   call ale#assert#TearDownLinterTest()
 
@@ -10,11 +13,11 @@ Execute(The XO executable should be called):
   AssertLinter 'xo', ale#Escape('xo') . ' --reporter json --stdin --stdin-filename %s'
 
 Execute(The XO executable should be configurable):
-  let b:ale_typescript_xo_executable = 'foobar'
+  let b:ale_javascript_xo_executable = 'foobar'
 
   AssertLinter 'foobar', ale#Escape('foobar') . ' --reporter json --stdin --stdin-filename %s'
 
 Execute(The XO options should be configurable):
-  let b:ale_typescript_xo_options = '--wat'
+  let b:ale_javascript_xo_options = '--wat'
 
   AssertLinter 'xo', ale#Escape('xo') . ' --wat --reporter json --stdin --stdin-filename %s'
diff --git a/test/command_callback/test_xots_command_callback.vader b/test/command_callback/test_xots_command_callback.vader
new file mode 100644
index 00000000..cc38ff02
--- /dev/null
+++ b/test/command_callback/test_xots_command_callback.vader
@@ -0,0 +1,23 @@
+Before:
+  call ale#assert#SetUpLinterTest('typescript', 'xo')
+  call ale#test#SetFilename('testfile.tsx')
+  unlet! b:executable
+
+  set filetype=typescriptreact
+  runtime autoload/ale/handlers/xo.vim
+
+After:
+  call ale#assert#TearDownLinterTest()
+
+Execute(The XO executable should be called):
+  AssertLinter 'xo', ale#Escape('xo') . ' --reporter json --stdin --stdin-filename %s'
+
+Execute(The XO executable should be configurable):
+  let b:ale_typescript_xo_executable = 'foobar'
+
+  AssertLinter 'foobar', ale#Escape('foobar') . ' --reporter json --stdin --stdin-filename %s'
+
+Execute(The XO options should be configurable):
+  let b:ale_typescript_xo_options = '--wat'
+
+  AssertLinter 'xo', ale#Escape('xo') . ' --wat --reporter json --stdin --stdin-filename %s'
diff --git a/test/eslint-test-files/react-app/node_modules/xo/cli.js b/test/eslint-test-files/react-app/node_modules/xo/cli.js
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/eslint-test-files/react-app/node_modules/xo/cli.js
diff --git a/test/eslint-test-files/react-app/subdir/testfile.ts b/test/eslint-test-files/react-app/subdir/testfile.ts
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/eslint-test-files/react-app/subdir/testfile.ts
diff --git a/test/fixers/test_xo_fixer_callback.vader b/test/fixers/test_xo_fixer_callback.vader
new file mode 100644
index 00000000..a473606e
--- /dev/null
+++ b/test/fixers/test_xo_fixer_callback.vader
@@ -0,0 +1,45 @@
+Before:
+  call ale#assert#SetUpFixerTest('javascript', 'xo')
+  runtime autoload/ale/handlers/xo.vim
+  set filetype=javascript
+
+After:
+  call ale#assert#TearDownFixerTest()
+
+Execute(The xo callback should return the correct default values):
+  call ale#test#SetFilename('../xo-test-files/monorepo/packages/a/index.js')
+
+  AssertFixer
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': (has('win32') ? 'node.exe ' : '')
+  \     . ale#Escape(ale#path#Simplify(g:dir . '/../xo-test-files/monorepo/node_modules/xo/cli.js'))
+  \     . ' --fix %t',
+  \ }
+
+Execute(The xo callback should include custom xo options):
+  let g:ale_javascript_xo_options = '--space'
+  call ale#test#SetFilename('../xo-test-files/monorepo/packages/a/index.js')
+
+  AssertFixer
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': (has('win32') ? 'node.exe ' : '')
+  \     . ale#Escape(ale#path#Simplify(g:dir . '/../xo-test-files/monorepo/node_modules/xo/cli.js'))
+  \     . ' --fix %t'
+  \     . ' --space',
+  \ }
+
+Execute(--stdin should be used when xo is new enough):
+  let g:ale_javascript_xo_options = '--space'
+  call ale#test#SetFilename('../xo-test-files/monorepo/packages/a/index.js')
+
+  GivenCommandOutput ['0.30.0']
+  AssertFixer
+  \ {
+  \   'command': (has('win32') ? 'node.exe ' : '')
+  \     . ale#Escape(ale#path#Simplify(g:dir . '/../xo-test-files/monorepo/node_modules/xo/cli.js'))
+  \     . ' --stdin --stdin-filename %s'
+  \     . ' --fix'
+  \     . ' --space',
+  \ }
diff --git a/test/fixers/test_xots_fixer_callback.vader b/test/fixers/test_xots_fixer_callback.vader
new file mode 100644
index 00000000..5c7fa1d1
--- /dev/null
+++ b/test/fixers/test_xots_fixer_callback.vader
@@ -0,0 +1,45 @@
+Before:
+  call ale#assert#SetUpFixerTest('typescript', 'xo')
+  runtime autoload/ale/handlers/xo.vim
+  set filetype=typescript
+
+After:
+  call ale#assert#TearDownFixerTest()
+
+Execute(The xo callback should return the correct default values):
+  call ale#test#SetFilename('../xo-test-files/monorepo/packages/a/index.ts')
+
+  AssertFixer
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': (has('win32') ? 'node.exe ' : '')
+  \     . ale#Escape(ale#path#Simplify(g:dir . '/../xo-test-files/monorepo/node_modules/xo/cli.js'))
+  \     . ' --fix %t',
+  \ }
+
+Execute(The xo callback should include custom xo options):
+  let g:ale_typescript_xo_options = '--space'
+  call ale#test#SetFilename('../xo-test-files/monorepo/packages/a/index.ts')
+
+  AssertFixer
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': (has('win32') ? 'node.exe ' : '')
+  \     . ale#Escape(ale#path#Simplify(g:dir . '/../xo-test-files/monorepo/node_modules/xo/cli.js'))
+  \     . ' --fix %t'
+  \     . ' --space',
+  \ }
+
+Execute(--stdin should be used when xo is new enough):
+  let g:ale_typescript_xo_options = '--space'
+  call ale#test#SetFilename('../xo-test-files/monorepo/packages/a/index.ts')
+
+  GivenCommandOutput ['0.30.0']
+  AssertFixer
+  \ {
+  \   'command': (has('win32') ? 'node.exe ' : '')
+  \     . ale#Escape(ale#path#Simplify(g:dir . '/../xo-test-files/monorepo/node_modules/xo/cli.js'))
+  \     . ' --stdin --stdin-filename %s'
+  \     . ' --fix'
+  \     . ' --space',
+  \ }
diff --git a/test/handler/test_ibm_openapi_validator_handler.vader b/test/handler/test_ibm_openapi_validator_handler.vader
new file mode 100644
index 00000000..e136d5d2
--- /dev/null
+++ b/test/handler/test_ibm_openapi_validator_handler.vader
@@ -0,0 +1,49 @@
+Before:
+  runtime! ale_linters/openapi/ibm_validator.vim
+
+After:
+  call ale#linter#Reset()
+
+Execute(Problems should be parsed correctly for openapi-ibm-validator):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 54,
+  \     'col': 0,
+  \     'type': 'E',
+  \     'text': 'Items with a description must have content in it.',
+  \   },
+  \   {
+  \     'lnum': 24,
+  \     'col': 0,
+  \     'type': 'W',
+  \     'text': 'Operations must have a non-empty `operationId`.',
+  \   },
+  \   {
+  \     'lnum': 40,
+  \     'col': 0,
+  \     'type': 'W',
+  \     'text': 'operationIds must follow case convention: lower_snake_case',
+  \   },
+  \ ],
+  \ ale_linters#openapi#ibm_validator#Handle(bufnr(''), [
+  \   '',
+  \   '[Warning] No .validaterc file found. The validator will run in default mode.',
+  \   'To configure the validator, create a .validaterc file.',
+  \   '',
+  \   'errors',
+  \   '',
+  \   '  Message :   Items with a description must have content in it.',
+  \   '  Path    :   paths./settings.patch.description',
+  \   '  Line    :   54',
+  \   '',
+  \   'warnings',
+  \   '',
+  \   '  Message :   Operations must have a non-empty `operationId`.',
+  \   '  Path    :   paths./stats.get.operationId',
+  \   '  Line    :   24',
+  \   '',
+  \   '  Message :   operationIds must follow case convention: lower_snake_case',
+  \   '  Path    :   paths./settings.get.operationId',
+  \   '  Line    :   40'
+  \ ])
diff --git a/test/handler/test_vala_lint_handler.vader b/test/handler/test_vala_lint_handler.vader
new file mode 100644
index 00000000..b8a4fbfa
--- /dev/null
+++ b/test/handler/test_vala_lint_handler.vader
@@ -0,0 +1,54 @@
+Before:
+  runtime ale_linters/vala/vala_lint.vim
+
+After:
+  call ale#linter#Reset()
+
+Execute(The Vala-Lint handler should parse lines correctly):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 18,
+  \     'col': 18,
+  \     'text': 'Expected space before paren',
+  \     'code': 'space-before-paren',
+  \     'type': 'E',
+  \   },
+  \   {
+  \     'lnum': 64,
+  \     'col': 37,
+  \     'text': 'Expected space before paren',
+  \     'code': 'space-before-paren',
+  \     'type': 'W',
+  \   },
+  \   {
+  \     'lnum': 73,
+  \     'col': 37,
+  \     'text': 'Expected space before paren',
+  \     'code': 'space-before-paren',
+  \     'type': 'E',
+  \   },
+  \ ],
+  \ ale_linters#vala#vala_lint#Handle(bufnr(''), [
+  \   'Application.vala',
+  \   '   18.18    error   Expected space before paren                     space-before-paren',
+  \   '   64.37    warn    Expected space before paren                     space-before-paren',
+  \   '   73.37    error   Expected space before paren                     space-before-paren',
+  \ ])
+
+Execute(The Vala-Lint handler should ignore unknown error types):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 73,
+  \     'col': 37,
+  \     'text': 'Expected space before paren',
+  \     'code': 'space-before-paren',
+  \     'type': 'E',
+  \   },
+  \ ],
+  \ ale_linters#vala#vala_lint#Handle(bufnr(''), [
+  \   'Application.vala',
+  \   '   18.18    test    Expected space before paren                     space-before-paren',
+  \   '   73.37    error   Expected space before paren                     space-before-paren',
+  \ ])
diff --git a/test/handler/test_yamllint_handler.vader b/test/handler/test_yamllint_handler.vader
index 1aa0b9f5..dd51119c 100644
--- a/test/handler/test_yamllint_handler.vader
+++ b/test/handler/test_yamllint_handler.vader
@@ -3,7 +3,7 @@ Before:
 
   let g:ale_warn_about_trailing_whitespace = 1
 
-  runtime! ale_linters/yaml/yamllint.vim
+  runtime! ale/handlers/yamllint.vim
 
 After:
   Restore
@@ -29,7 +29,7 @@ Execute(Problems should be parsed correctly for yamllint):
   \     'text': 'syntax error: expected the node content, but found ''<stream end>''',
   \   },
   \ ],
-  \ ale_linters#yaml#yamllint#Handle(bufnr(''), [
+  \ ale#handlers#yamllint#Handle(bufnr(''), [
   \   'something.yaml:1:1: [warning] missing document start "---" (document-start)',
   \   'something.yml:2:1: [error] syntax error: expected the node content, but found ''<stream end>''',
   \ ])
@@ -45,7 +45,7 @@ Execute(The yamllint handler should respect ale_warn_about_trailing_whitespace):
   \     'code': 'trailing-spaces',
   \   },
   \ ],
-  \ ale_linters#yaml#yamllint#Handle(bufnr(''), [
+  \ ale#handlers#yamllint#Handle(bufnr(''), [
   \   'something.yml:5:18: [error] trailing spaces (trailing-spaces)',
   \ ])
 
@@ -54,6 +54,6 @@ Execute(The yamllint handler should respect ale_warn_about_trailing_whitespace):
   AssertEqual
   \ [
   \ ],
-  \ ale_linters#yaml#yamllint#Handle(bufnr(''), [
+  \ ale#handlers#yamllint#Handle(bufnr(''), [
   \   'something.yml:5:18: [error] trailing spaces (trailing-spaces)',
   \ ])
diff --git a/test/xo-test-files/monorepo/node_modules/xo/cli.js b/test/xo-test-files/monorepo/node_modules/xo/cli.js
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/xo-test-files/monorepo/node_modules/xo/cli.js
diff --git a/test/xo-test-files/monorepo/package.json b/test/xo-test-files/monorepo/package.json
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/xo-test-files/monorepo/package.json
diff --git a/test/xo-test-files/monorepo/packages/a/index.js b/test/xo-test-files/monorepo/packages/a/index.js
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/xo-test-files/monorepo/packages/a/index.js
diff --git a/test/xo-test-files/monorepo/packages/a/index.ts b/test/xo-test-files/monorepo/packages/a/index.ts
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/xo-test-files/monorepo/packages/a/index.ts
diff --git a/test/xo-test-files/monorepo/packages/a/package.json b/test/xo-test-files/monorepo/packages/a/package.json
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/xo-test-files/monorepo/packages/a/package.json