Merge remote-tracking branch 'upstream/master'

36 files changed, 683 insertions, 72 deletions

diff --git a/Dockerfile b/Dockerfile
index a21299e6..397277d9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,6 +10,8 @@ ENV PACKAGES="\
     git \
     python \
     py-pip \
+    grep \
+    sed \
 "
 RUN apk --update add $PACKAGES && \
     rm -rf /var/cache/apk/* /tmp/* /var/tmp/*
diff --git a/ale_linters/erlang/erlc.vim b/ale_linters/erlang/erlc.vim
index a83bacc3..e78dc341 100644
--- a/ale_linters/erlang/erlc.vim
+++ b/ale_linters/erlang/erlc.vim
@@ -1,14 +1,22 @@
 " Author: Magnus Ottenklinger - https://github.com/evnu
 
+let g:ale_erlang_erlc_executable = get(g:, 'ale_erlang_erlc_executable', 'erlc')
 let g:ale_erlang_erlc_options = get(g:, 'ale_erlang_erlc_options', '')
 
+function! ale_linters#erlang#erlc#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'erlang_erlc_executable')
+endfunction
+
 function! ale_linters#erlang#erlc#GetCommand(buffer) abort
     let l:output_file = ale#util#Tempname()
     call ale#command#ManageFile(a:buffer, l:output_file)
 
-    return 'erlc -o ' . ale#Escape(l:output_file)
-    \   . ' ' . ale#Var(a:buffer, 'erlang_erlc_options')
-    \   . ' %t'
+    let l:command = ale#Escape(ale_linters#erlang#erlc#GetExecutable(a:buffer))
+    \             . ' -o ' . ale#Escape(l:output_file)
+    \             . ' ' . ale#Var(a:buffer, 'erlang_erlc_options')
+    \             . ' %t'
+
+    return l:command
 endfunction
 
 function! ale_linters#erlang#erlc#Handle(buffer, lines) abort
@@ -90,7 +98,7 @@ endfunction
 
 call ale#linter#Define('erlang', {
 \   'name': 'erlc',
-\   'executable': 'erlc',
+\   'executable': function('ale_linters#erlang#erlc#GetExecutable'),
 \   'command': function('ale_linters#erlang#erlc#GetCommand'),
 \   'callback': 'ale_linters#erlang#erlc#Handle',
 \})
diff --git a/ale_linters/inko/inko.vim b/ale_linters/inko/inko.vim
new file mode 100644
index 00000000..11558897
--- /dev/null
+++ b/ale_linters/inko/inko.vim
@@ -0,0 +1,33 @@
+" Author: Yorick Peterse <yorick@yorickpeterse.com>
+" Description: linting of Inko source code using the Inko compiler
+
+call ale#Set('inko_inko_executable', 'inko')
+
+function! ale_linters#inko#inko#GetCommand(buffer) abort
+    let l:include = ''
+
+    " Include the tests source directory, but only for test files.
+    if expand('#' . a:buffer . ':p') =~? '\vtests[/\\]test[/\\]'
+        let l:test_dir = ale#path#FindNearestDirectory(a:buffer, 'tests')
+
+        if isdirectory(l:test_dir)
+            let l:include = '--include ' . ale#Escape(l:test_dir)
+        endif
+    endif
+
+    " We use %s instead of %t so the compiler determines the correct module
+    " names for the file being edited. Not doing so may lead to errors in
+    " certain cases.
+    return '%e build --check --format=json'
+    \ . ale#Pad(l:include)
+    \ . ' %s'
+endfunction
+
+call ale#linter#Define('inko', {
+\   'name': 'inko',
+\   'executable': {b -> ale#Var(b, 'inko_inko_executable')},
+\   'command': function('ale_linters#inko#inko#GetCommand'),
+\   'callback': 'ale#handlers#inko#Handle',
+\   'output_stream': 'stderr',
+\   'lint_file': 1
+\})
diff --git a/ale_linters/salt/salt_lint.vim b/ale_linters/salt/salt_lint.vim
index d2027119..47f66d83 100644
--- a/ale_linters/salt/salt_lint.vim
+++ b/ale_linters/salt/salt_lint.vim
@@ -25,7 +25,8 @@ function! ale_linters#salt#salt_lint#Handle(buffer, lines) abort
 endfunction
 
 call ale#linter#Define('salt', {
-\   'name': 'salt-lint',
+\   'name': 'salt_lint',
+\   'aliases': ['salt-lint'],
 \   'executable': {b -> ale#Var(b, 'salt_salt_lint_executable')},
 \   'command': function('ale_linters#salt#salt_lint#GetCommand'),
 \   'callback': 'ale_linters#salt#salt_lint#Handle'
diff --git a/autoload/ale/codefix.vim b/autoload/ale/codefix.vim
index 69bf36fa..4a78063b 100644
--- a/autoload/ale/codefix.vim
+++ b/autoload/ale/codefix.vim
@@ -261,7 +261,10 @@ function! ale#codefix#HandleLSPResponse(conn_id, response) abort
 
         " Send the results to the menu callback, if set.
         if l:MenuCallback isnot v:null
-            call l:MenuCallback(map(copy(l:result), '[''lsp'', v:val]'))
+            call l:MenuCallback(
+            \   l:data,
+            \   map(copy(l:result), '[''lsp'', v:val]')
+            \)
 
             return
         endif
diff --git a/autoload/ale/cursor.vim b/autoload/ale/cursor.vim
index 9ca6fb15..e8478e93 100644
--- a/autoload/ale/cursor.vim
+++ b/autoload/ale/cursor.vim
@@ -9,7 +9,6 @@ let g:ale_echo_delay = get(g:, 'ale_echo_delay', 10)
 let g:ale_echo_msg_format = get(g:, 'ale_echo_msg_format', '%code: %%s')
 
 let s:cursor_timer = -1
-let s:last_pos = [0, 0, 0]
 
 function! ale#cursor#TruncatedEcho(original_message) abort
     let l:message = a:original_message
@@ -118,14 +117,18 @@ function! ale#cursor#EchoCursorWarningWithDelay() abort
 
     let l:pos = getpos('.')[0:2]
 
+    if !exists('w:last_pos')
+        let w:last_pos = [0, 0, 0]
+    endif
+
     " Check the current buffer, line, and column number against the last
     " recorded position. If the position has actually changed, *then*
     " we should echo something. Otherwise we can end up doing processing
     " the echo message far too frequently.
-    if l:pos != s:last_pos
+    if l:pos != w:last_pos
         let l:delay = ale#Var(l:buffer, 'echo_delay')
 
-        let s:last_pos = l:pos
+        let w:last_pos = l:pos
         let s:cursor_timer = timer_start(
         \   l:delay,
         \   function('ale#cursor#EchoCursorWarning')
@@ -139,11 +142,16 @@ function! s:ShowCursorDetailForItem(loc, options) abort
     let s:last_detailed_line = line('.')
     let l:message = get(a:loc, 'detail', a:loc.text)
     let l:lines = split(l:message, "\n")
-    call ale#preview#Show(l:lines, {'stay_here': l:stay_here})
 
-    " Clear the echo message if we manually displayed details.
-    if !l:stay_here
-        execute 'echo'
+    if g:ale_floating_preview || g:ale_detail_to_floating_preview
+        call ale#floating_preview#Show(l:lines)
+    else
+        call ale#preview#Show(l:lines, {'stay_here': l:stay_here})
+
+        " Clear the echo message if we manually displayed details.
+        if !l:stay_here
+            execute 'echo'
+        endif
     endif
 endfunction
 
diff --git a/autoload/ale/fix/registry.vim b/autoload/ale/fix/registry.vim
index 0f146faa..47f978e8 100644
--- a/autoload/ale/fix/registry.vim
+++ b/autoload/ale/fix/registry.vim
@@ -132,7 +132,7 @@ let s:default_registry = {
 \   },
 \   'scalafmt': {
 \       'function': 'ale#fixers#scalafmt#Fix',
-\       'suggested_filetypes': ['scala'],
+\       'suggested_filetypes': ['sbt', 'scala'],
 \       'description': 'Fix Scala files using scalafmt',
 \   },
 \   'sorbet': {
diff --git a/autoload/ale/floating_preview.vim b/autoload/ale/floating_preview.vim
new file mode 100644
index 00000000..e6a75689
--- /dev/null
+++ b/autoload/ale/floating_preview.vim
@@ -0,0 +1,91 @@
+" Author: Jan-Grimo Sobez <jan-grimo.sobez@phys.chem.ethz.ch>
+" Author: Kevin Clark <kevin.clark@gmail.com>
+" Description: Floating preview window for showing whatever information in.
+
+" Precondition: exists('*nvim_open_win')
+
+function! ale#floating_preview#Show(lines, ...) abort
+    if !exists('*nvim_open_win')
+        execute 'echom ''Floating windows not supported in this vim instance.'''
+
+        return
+    endif
+
+    " Remove the close autocmd so it doesn't happen mid update
+    augroup ale_floating_preview_window
+        autocmd!
+    augroup END
+
+    let l:options = get(a:000, 0, {})
+
+    " Only create a new window if we need it
+    if !exists('w:preview') || index(nvim_list_wins(), w:preview['id']) is# -1
+        call s:Create(l:options)
+    else
+        call nvim_buf_set_option(w:preview['buffer'], 'modifiable', v:true)
+    endif
+
+    " Execute commands in window context
+    let l:parent_window = nvim_get_current_win()
+
+    call nvim_set_current_win(w:preview['id'])
+
+    for l:command in get(l:options, 'commands', [])
+        call execute(l:command)
+    endfor
+
+    call nvim_set_current_win(l:parent_window)
+
+    " Return to parent context on move
+    augroup ale_floating_preview_window
+        autocmd!
+
+        if g:ale_close_preview_on_insert
+            autocmd CursorMoved,TabLeave,WinLeave,InsertEnter <buffer> ++once call s:Close()
+        else
+            autocmd CursorMoved,TabLeave,WinLeave <buffer> ++once call s:Close()
+        endif
+    augroup END
+
+    let l:width = max(map(copy(a:lines), 'strdisplaywidth(v:val)'))
+    let l:height = min([len(a:lines), 10])
+    call nvim_win_set_width(w:preview['id'], l:width)
+    call nvim_win_set_height(w:preview['id'], l:height)
+
+    call nvim_buf_set_lines(w:preview['buffer'], 0, -1, v:false, a:lines)
+    call nvim_buf_set_option(w:preview['buffer'], 'modified', v:false)
+    call nvim_buf_set_option(w:preview['buffer'], 'modifiable', v:false)
+endfunction
+
+function! s:Create(options) abort
+    let l:buffer = nvim_create_buf(v:false, v:false)
+    let l:winid = nvim_open_win(l:buffer, v:false, {
+    \ 'relative': 'cursor',
+    \ 'row': 1,
+    \ 'col': 0,
+    \ 'width': 42,
+    \ 'height': 4,
+    \ 'style': 'minimal'
+    \ })
+    call nvim_buf_set_option(l:buffer, 'buftype', 'acwrite')
+    call nvim_buf_set_option(l:buffer, 'bufhidden', 'delete')
+    call nvim_buf_set_option(l:buffer, 'swapfile', v:false)
+    call nvim_buf_set_option(l:buffer, 'filetype', get(a:options, 'filetype', 'ale-preview'))
+
+    let w:preview = {'id': l:winid, 'buffer': l:buffer}
+endfunction
+
+function! s:Close() abort
+    if !exists('w:preview')
+        return
+    endif
+
+    call setbufvar(w:preview['buffer'], '&modified', 0)
+
+    if win_id2win(w:preview['id']) > 0
+        execute win_id2win(w:preview['id']).'wincmd c'
+    endif
+
+    unlet w:preview
+endfunction
+
diff --git a/autoload/ale/handlers/inko.vim b/autoload/ale/handlers/inko.vim
new file mode 100644
index 00000000..73f06871
--- /dev/null
+++ b/autoload/ale/handlers/inko.vim
@@ -0,0 +1,37 @@
+" Author: Yorick Peterse <yorick@yorickpeterse.com>
+" Description: output handlers for the Inko JSON format
+
+function! ale#handlers#inko#GetType(severity) abort
+    if a:severity is? 'warning'
+        return 'W'
+    endif
+
+    return 'E'
+endfunction
+
+function! ale#handlers#inko#Handle(buffer, lines) abort
+    try
+        let l:errors = json_decode(join(a:lines, ''))
+    catch
+        return []
+    endtry
+
+    if empty(l:errors)
+        return []
+    endif
+
+    let l:output = []
+    let l:dir = expand('#' . a:buffer . ':p:h')
+
+    for l:error in l:errors
+        call add(l:output, {
+        \   'filename': ale#path#GetAbsPath(l:dir, l:error['file']),
+        \   'lnum': l:error['line'],
+        \   'col': l:error['column'],
+        \   'text': l:error['message'],
+        \   'type': ale#handlers#inko#GetType(l:error['level']),
+        \})
+    endfor
+
+    return l:output
+endfunction
diff --git a/autoload/ale/hover.vim b/autoload/ale/hover.vim
index 1d38f3b9..cb0379fd 100644
--- a/autoload/ale/hover.vim
+++ b/autoload/ale/hover.vim
@@ -46,6 +46,10 @@ function! ale#hover#HandleTSServerResponse(conn_id, response) abort
                 call balloon_show(a:response.body.displayString)
             elseif get(l:options, 'truncated_echo', 0)
                 call ale#cursor#TruncatedEcho(split(a:response.body.displayString, "\n")[0])
+            elseif g:ale_hover_to_floating_preview || g:ale_floating_preview
+                call ale#floating_preview#Show(split(a:response.body.displayString, "\n"), {
+                \   'filetype': 'ale-preview.message',
+                \})
             elseif g:ale_hover_to_preview
                 call ale#preview#Show(split(a:response.body.displayString, "\n"), {
                 \   'filetype': 'ale-preview.message',
@@ -226,6 +230,11 @@ function! ale#hover#HandleLSPResponse(conn_id, response) abort
                 call balloon_show(join(l:lines, "\n"))
             elseif get(l:options, 'truncated_echo', 0)
                 call ale#cursor#TruncatedEcho(l:lines[0])
+            elseif g:ale_hover_to_floating_preview || g:ale_floating_preview
+                call ale#floating_preview#Show(l:lines, {
+                \   'filetype': 'ale-preview.message',
+                \   'commands': l:commands,
+                \})
             elseif g:ale_hover_to_preview
                 call ale#preview#Show(l:lines, {
                 \   'filetype': 'ale-preview.message',
diff --git a/autoload/ale/linter.vim b/autoload/ale/linter.vim
index 645c25f9..ba11e1eb 100644
--- a/autoload/ale/linter.vim
+++ b/autoload/ale/linter.vim
@@ -43,6 +43,7 @@ let s:default_ale_linters = {
 \   'go': ['gofmt', 'golint', 'go vet'],
 \   'hack': ['hack'],
 \   'help': [],
+\   'inko': ['inko'],
 \   'perl': ['perlcritic'],
 \   'perl6': [],
 \   'python': ['flake8', 'mypy', 'pylint', 'pyright'],
diff --git a/autoload/ale/python.vim b/autoload/ale/python.vim
index 7ed22367..fc6c1130 100644
--- a/autoload/ale/python.vim
+++ b/autoload/ale/python.vim
@@ -32,6 +32,8 @@ function! ale#python#FindProjectRootIni(buffer) abort
         \|| filereadable(l:path . '/.pylintrc')
         \|| filereadable(l:path . '/Pipfile')
         \|| filereadable(l:path . '/Pipfile.lock')
+        \|| filereadable(l:path . '/poetry.lock')
+        \|| filereadable(l:path . '/pyproject.toml')
             return l:path
         endif
     endfor
diff --git a/autoload/ale/util.vim b/autoload/ale/util.vim
index fcc03eb7..1f396377 100644
--- a/autoload/ale/util.vim
+++ b/autoload/ale/util.vim
@@ -486,7 +486,7 @@ function! ale#util#Input(message, value) abort
 endfunction
 
 function! ale#util#HasBuflineApi() abort
-    return exists('*deletebufline') && exists('*appendbufline') && exists('*getpos') && exists('*setpos')
+    return exists('*deletebufline') && exists('*setbufline')
 endfunction
 
 " Sets buffer contents to lines
@@ -507,11 +507,8 @@ function! ale#util#SetBufferContents(buffer, lines) abort
 
     " Use a Vim API for setting lines in other buffers, if available.
     if l:has_bufline_api
-        let l:save_cursor = getpos('.')
-        call deletebufline(a:buffer, 1, '$')
-        call appendbufline(a:buffer, 1, l:new_lines)
-        call deletebufline(a:buffer, 1, 1)
-        call setpos('.', l:save_cursor)
+        call setbufline(a:buffer, 1, l:new_lines)
+        call deletebufline(a:buffer, l:first_line_to_remove, '$')
     " Fall back on setting lines the old way, for the current buffer.
     else
         let l:old_line_length = line('$')
diff --git a/doc/ale-erlang.txt b/doc/ale-erlang.txt
index 38762f08..9ee9a51d 100644
--- a/doc/ale-erlang.txt
+++ b/doc/ale-erlang.txt
@@ -46,6 +46,14 @@ g:ale_erlang_elvis_executable                   *g:ale_erlang_elvis_executable*
 -------------------------------------------------------------------------------
 erlc                                                          *ale-erlang-erlc*
 
+g:ale_erlang_erlc_executable                     *g:ale_erlang_erlc_executable*
+                                                 *b:ale_erlang_erlc_executable*
+  Type: |String|
+  Default: `'erlc'`
+
+  This variable can be changed to specify the erlc executable.
+
+
 g:ale_erlang_erlc_options                           *g:ale_erlang_erlc_options*
                                                     *b:ale_erlang_erlc_options*
   Type: |String|
diff --git a/doc/ale-inko.txt b/doc/ale-inko.txt
new file mode 100644
index 00000000..5ca14af6
--- /dev/null
+++ b/doc/ale-inko.txt
@@ -0,0 +1,22 @@
+===============================================================================
+ALE Inko Integration                                         *ale-inko-options*
+                                                         *ale-integration-inko*
+
+===============================================================================
+Integration Information
+
+  Currently, the only supported linter for Inko is the Inko compiler itself.
+
+===============================================================================
+inko                                                            *ale-inko-inko*
+
+g:ale_inko_inko_executable                         *g:ale_inko_inko_executable*
+                                                   *b:ale_inko_inko_executable*
+  Type: |String|
+  Default: `'inko'`
+
+  This variable can be modified to change the executable path for `inko`.
+
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:
diff --git a/doc/ale-python.txt b/doc/ale-python.txt
index 504705f2..1f263e84 100644
--- a/doc/ale-python.txt
+++ b/doc/ale-python.txt
@@ -36,6 +36,8 @@ ALE will look for configuration files with the following filenames. >
   .pylintrc
   Pipfile
   Pipfile.lock
+  poetry.lock 
+  pyproject.toml
 <
 
 The first directory containing any of the files named above will be used.
diff --git a/doc/ale-supported-languages-and-tools.txt b/doc/ale-supported-languages-and-tools.txt
index 3d6c50d1..5bbe6097 100644
--- a/doc/ale-supported-languages-and-tools.txt
+++ b/doc/ale-supported-languages-and-tools.txt
@@ -50,8 +50,8 @@ Notes:
   * `astyle`
   * `ccls`
   * `clang` (`cc`)
-  * `clangd`
   * `clang-format`
+  * `clangd`
   * `clangtidy`!!
   * `cppcheck`
   * `cpplint`!!
@@ -68,9 +68,9 @@ Notes:
   * `astyle`
   * `ccls`
   * `clang` (`cc`)
+  * `clang-format`
   * `clangcheck`!!
   * `clangd`
-  * `clang-format`
   * `clangtidy`!!
   * `clazy`!!
   * `cppcheck`
@@ -141,9 +141,9 @@ Notes:
   * `erubis`
   * `ruumba`
 * Erlang
+  * `SyntaxErl`
   * `elvis`!!
   * `erlc`
-  * `SyntaxErl`
 * Fish
   * `fish` (-n flag)
 * Fortran
@@ -161,17 +161,17 @@ Notes:
 * Go
   * `bingo`
   * `go build`!!
+  * `go mod`!!
+  * `go vet`!!
   * `gofmt`
   * `goimports`
   * `golangci-lint`!!
   * `golangserver`
   * `golint`
   * `gometalinter`!!
-  * `go mod`!!
   * `gopls`
   * `gosimple`!!
   * `gotype`!!
-  * `go vet`!!
   * `revive`!!
   * `staticcheck`!!
 * GraphQL
@@ -204,10 +204,10 @@ Notes:
 * HCL
   * `terraform-fmt`
 * HTML
+  * `HTMLHint`
   * `alex`!!
   * `fecs`
   * `html-beautify`
-  * `HTMLHint`
   * `prettier`
   * `proselint`
   * `tidy`
@@ -216,15 +216,17 @@ Notes:
   * `idris`
 * Ink
   * `ink-language-server`
+* Inko
+  * `inko` !!
 * ISPC
   * `ispc`!!
 * Java
+  * `PMD`
   * `checkstyle`
   * `eclipselsp`
   * `google-java-format`
   * `javac`
   * `javalsp`
-  * `PMD`
   * `uncrustify`
 * JavaScript
   * `eslint`
@@ -331,10 +333,10 @@ Notes:
   * `intelephense`
   * `langserver`
   * `phan`
+  * `php -l`
+  * `php-cs-fixer`
   * `phpcbf`
   * `phpcs`
-  * `php-cs-fixer`
-  * `php -l`
   * `phpmd`
   * `phpstan`
   * `psalm`!!
@@ -395,6 +397,8 @@ Notes:
   * `styler`
 * Racket
   * `raco`
+* Re:VIEW
+  * `redpen`
 * ReasonML
   * `merlin`
   * `ols`
@@ -408,8 +412,6 @@ Notes:
   * `textlint`
   * `vale`
   * `write-good`
-* Re:VIEW
-  * `redpen`
 * RPM spec
   * `rpmlint`
 * Ruby
@@ -456,10 +458,10 @@ Notes:
   * `solium`
 * SQL
   * `pgformatter`
+  * `sql-lint`
   * `sqlfmt`
   * `sqlformat`
   * `sqlint`
-  * `sql-lint`
 * Stylus
   * `stylelint`
 * SugarSS
diff --git a/doc/ale.txt b/doc/ale.txt
index 28f6902f..fe94baf2 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -646,6 +646,9 @@ problem will be displayed in a balloon instead of hover information.
 Hover information can be displayed in the preview window instead by setting
 |g:ale_hover_to_preview| to `1`.
 
+When using Neovim, if |g:ale_hover_to_floating_preview| or |g:ale_floating_preview|
+is set to 1, the hover information will show in a floating window.
+
 For Vim 8.1+ terminals, mouse hovering is disabled by default. Enabling
 |balloonexpr| commands in terminals can cause scrolling issues in terminals,
 so ALE will not attempt to show balloons unless |g:ale_set_balloons| is set to
@@ -954,6 +957,15 @@ g:ale_default_navigation                             *g:ale_default_navigation*
   buffer, such as for |ALEFindReferences|, or |ALEGoToDefinition|.
 
 
+g:ale_detail_to_floating_preview                            *g:ale_detail_to_floating_preview*
+                                                            *b:ale_detail_to_floating_preview*
+  Type: |Number|
+  Default: `0`
+
+  When this option is set to `1`, Neovim will use a floating window for
+  ALEDetail output.
+
+
 g:ale_disable_lsp                                           *g:ale_disable_lsp*
                                                             *b:ale_disable_lsp*
 
@@ -1177,6 +1189,16 @@ g:ale_fix_on_save_ignore                             *g:ale_fix_on_save_ignore*
   let g:ale_fix_on_save_ignore = [g:AddBar]
 <
 
+g:ale_floating_preview                                       *g:ale_floating_preview*
+
+  Type: |Number|
+  Default: `0`
+
+  When set to `1`, Neovim will use a floating window for ale's preview window.
+  This is equivalent to setting |g:ale_hover_to_floating_preview| and
+  |g:ale_detail_to_floating_preview| to `1`.
+
+
 g:ale_history_enabled                                   *g:ale_history_enabled*
 
   Type: |Number|
@@ -1235,6 +1257,14 @@ g:ale_hover_to_preview                                 *g:ale_hover_to_preview*
   instead of in balloons or the message line.
 
 
+g:ale_hover_to_floating_preview                       *g:ale_hover_to_floating_preview*
+                                                      *b:ale_hover_to_floating_preview*
+  Type: |Number|
+  Default: `0`
+
+  If set to `1`, Neovim will use floating windows for hover messages.
+
+
 g:ale_keep_list_window_open                       *g:ale_keep_list_window_open*
                                                   *b:ale_keep_list_window_open*
   Type: |Number|
@@ -1531,6 +1561,7 @@ g:ale_linters                                                   *g:ale_linters*
   \   'go': ['gofmt', 'golint', 'go vet'],
   \   'hack': ['hack'],
   \   'help': [],
+  \   'inko': ['inko'],
   \   'perl': ['perlcritic'],
   \   'perl6': [],
   \   'python': ['flake8', 'mypy', 'pylint', 'pyright'],
@@ -2709,6 +2740,8 @@ documented in additional help files.
     idris.................................|ale-idris-idris|
   ink.....................................|ale-ink-options|
     ink-language-server...................|ale-ink-language-server|
+  inko....................................|ale-inko-options|
+    inko..................................|ale-inko-inko|
   ispc....................................|ale-ispc-options|
     ispc..................................|ale-ispc-ispc|
   java....................................|ale-java-options|
@@ -2959,11 +2992,11 @@ documented in additional help files.
     hdl-checker...........................|ale-vhdl-hdl-checker|
     vcom..................................|ale-vhdl-vcom|
     xvhdl.................................|ale-vhdl-xvhdl|
+  vim help................................|ale-vim-help-options|
+    write-good............................|ale-vim-help-write-good|
   vim.....................................|ale-vim-options|
     vimls.................................|ale-vim-vimls|
     vint..................................|ale-vim-vint|
-  vim help................................|ale-vim-help-options|
-    write-good............................|ale-vim-help-write-good|
   vue.....................................|ale-vue-options|
     prettier..............................|ale-vue-prettier|
     vls...................................|ale-vue-vls|
diff --git a/plugin/ale.vim b/plugin/ale.vim
index 5b7be116..1735715d 100644
--- a/plugin/ale.vim
+++ b/plugin/ale.vim
@@ -138,6 +138,15 @@ let g:ale_set_balloons = get(g:, 'ale_set_balloons', has('balloon_eval') && has(
 " Use preview window for hover messages.
 let g:ale_hover_to_preview = get(g:, 'ale_hover_to_preview', 0)
 
+" Float preview windows in Neovim
+let g:ale_floating_preview = get(g:, 'ale_floating_preview', 0)
+
+" Hovers use floating windows in Neovim
+let g:ale_hover_to_floating_preview = get(g:, 'ale_hover_to_floating_preview', 0)
+
+" Detail uses floating windows in Neovim
+let g:ale_detail_to_floating_preview = get(g:, 'ale_detail_to_floating_preview', 0)
+
 " This flag can be set to 0 to disable warnings for trailing whitespace
 let g:ale_warn_about_trailing_whitespace = get(g:, 'ale_warn_about_trailing_whitespace', 1)
 " This flag can be set to 0 to disable warnings for trailing blank lines
diff --git a/run-tests b/run-tests
index 1d452a72..06a05384 100755
--- a/run-tests
+++ b/run-tests
@@ -10,7 +10,7 @@ set -u
 #
 
 image=w0rp/ale
-current_image_id=f58c7bf8900f
+current_image_id=1c04720f5d17
 
 # Used in all test scripts for running the selected Docker image.
 DOCKER_RUN_IMAGE="$image"
diff --git a/supported-tools.md b/supported-tools.md
index ae943ebb..ab7eaf9f 100644
--- a/supported-tools.md
+++ b/supported-tools.md
@@ -59,8 +59,8 @@ formatting.
   * [astyle](http://astyle.sourceforge.net/)
   * [ccls](https://github.com/MaskRay/ccls)
   * [clang](http://clang.llvm.org/)
-  * [clangd](https://clang.llvm.org/extra/clangd.html)
   * [clang-format](https://clang.llvm.org/docs/ClangFormat.html)
+  * [clangd](https://clang.llvm.org/extra/clangd.html)
   * [clangtidy](http://clang.llvm.org/extra/clang-tidy/) :floppy_disk:
   * [cppcheck](http://cppcheck.sourceforge.net)
   * [cpplint](https://github.com/google/styleguide/tree/gh-pages/cpplint)
@@ -77,9 +77,9 @@ formatting.
   * [astyle](http://astyle.sourceforge.net/)
   * [ccls](https://github.com/MaskRay/ccls)
   * [clang](http://clang.llvm.org/)
+  * [clang-format](https://clang.llvm.org/docs/ClangFormat.html)
   * [clangcheck](http://clang.llvm.org/docs/ClangCheck.html) :floppy_disk:
   * [clangd](https://clang.llvm.org/extra/clangd.html)
-  * [clang-format](https://clang.llvm.org/docs/ClangFormat.html)
   * [clangtidy](http://clang.llvm.org/extra/clang-tidy/) :floppy_disk:
   * [clazy](https://github.com/KDE/clazy) :floppy_disk:
   * [cppcheck](http://cppcheck.sourceforge.net)
@@ -150,9 +150,9 @@ formatting.
   * [erubis](https://github.com/kwatch/erubis)
   * [ruumba](https://github.com/ericqweinstein/ruumba)
 * Erlang
+  * [SyntaxErl](https://github.com/ten0s/syntaxerl)
   * [elvis](https://github.com/inaka/elvis) :floppy_disk:
   * [erlc](http://erlang.org/doc/man/erlc.html)
-  * [SyntaxErl](https://github.com/ten0s/syntaxerl)
 * Fish
   * fish [-n flag](https://linux.die.net/man/1/fish)
 * Fortran
@@ -170,17 +170,17 @@ formatting.
 * Go
   * [bingo](https://github.com/saibing/bingo) :warning:
   * [go build](https://golang.org/cmd/go/) :warning: :floppy_disk:
+  * [go mod](https://golang.org/cmd/go/) :warning: :floppy_disk:
+  * [go vet](https://golang.org/cmd/vet/) :floppy_disk:
   * [gofmt](https://golang.org/cmd/gofmt/)
   * [goimports](https://godoc.org/golang.org/x/tools/cmd/goimports) :warning:
   * [golangci-lint](https://github.com/golangci/golangci-lint) :warning: :floppy_disk:
   * [golangserver](https://github.com/sourcegraph/go-langserver) :warning:
   * [golint](https://godoc.org/github.com/golang/lint)
   * [gometalinter](https://github.com/alecthomas/gometalinter) :warning: :floppy_disk:
-  * [go mod](https://golang.org/cmd/go/) :warning: :floppy_disk:
   * [gopls](https://github.com/golang/go/wiki/gopls) :warning:
   * [gosimple](https://github.com/dominikh/go-tools/tree/master/cmd/gosimple) :warning: :floppy_disk:
   * [gotype](https://godoc.org/golang.org/x/tools/cmd/gotype) :warning: :floppy_disk:
-  * [go vet](https://golang.org/cmd/vet/) :floppy_disk:
   * [revive](https://github.com/mgechev/revive) :warning: :floppy_disk:
   * [staticcheck](https://github.com/dominikh/go-tools/tree/master/cmd/staticcheck) :warning: :floppy_disk:
 * GraphQL
@@ -213,10 +213,10 @@ formatting.
 * HCL
   * [terraform-fmt](https://github.com/hashicorp/terraform)
 * HTML
+  * [HTMLHint](http://htmlhint.com/)
   * [alex](https://github.com/wooorm/alex) :floppy_disk:
   * [fecs](http://fecs.baidu.com/)
   * [html-beautify](https://beautifier.io/)
-  * [HTMLHint](http://htmlhint.com/)
   * [prettier](https://github.com/prettier/prettier)
   * [proselint](http://proselint.com/)
   * [tidy](http://www.html-tidy.org/)
@@ -225,15 +225,17 @@ formatting.
   * [idris](http://www.idris-lang.org/)
 * Ink
   * [ink-language-server](https://github.com/ephread/ink-language-server)
+* Inko
+  * [inko](https://inko-lang.org/) :floppy_disk:
 * ISPC
   * [ispc](https://ispc.github.io/) :floppy_disk:
 * Java
+  * [PMD](https://pmd.github.io/)
   * [checkstyle](http://checkstyle.sourceforge.net)
   * [eclipselsp](https://github.com/eclipse/eclipse.jdt.ls)
   * [google-java-format](https://github.com/google/google-java-format)
   * [javac](http://www.oracle.com/technetwork/java/javase/downloads/index.html)
   * [javalsp](https://github.com/georgewfraser/vscode-javac)
-  * [PMD](https://pmd.github.io/)
   * [uncrustify](https://github.com/uncrustify/uncrustify)
 * JavaScript
   * [eslint](http://eslint.org/)
@@ -340,10 +342,10 @@ formatting.
   * [intelephense](https://github.com/bmewburn/intelephense-docs)
   * [langserver](https://github.com/felixfbecker/php-language-server)
   * [phan](https://github.com/phan/phan) see `:help ale-php-phan` to instructions
+  * [php -l](https://secure.php.net/)
+  * [php-cs-fixer](http://cs.sensiolabs.org/)
   * [phpcbf](https://github.com/squizlabs/PHP_CodeSniffer)
   * [phpcs](https://github.com/squizlabs/PHP_CodeSniffer)
-  * [php-cs-fixer](http://cs.sensiolabs.org/)
-  * [php -l](https://secure.php.net/)
   * [phpmd](https://phpmd.org)
   * [phpstan](https://github.com/phpstan/phpstan)
   * [psalm](https://getpsalm.org) :floppy_disk:
@@ -404,6 +406,8 @@ formatting.
   * [styler](https://github.com/r-lib/styler)
 * Racket
   * [raco](https://docs.racket-lang.org/raco/)
+* Re:VIEW
+  * [redpen](http://redpen.cc/)
 * ReasonML
   * [merlin](https://github.com/the-lambda-church/merlin) see `:help ale-reasonml-ols` for configuration instructions
   * [ols](https://github.com/freebroccolo/ocaml-language-server)
@@ -417,8 +421,6 @@ formatting.
   * [textlint](https://textlint.github.io/)
   * [vale](https://github.com/ValeLint/vale)
   * [write-good](https://github.com/btford/write-good)
-* Re:VIEW
-  * [redpen](http://redpen.cc/)
 * RPM spec
   * [rpmlint](https://github.com/rpm-software-management/rpmlint) :warning: (see `:help ale-integration-spec`)
 * Ruby
@@ -465,10 +467,10 @@ formatting.
   * [solium](https://github.com/duaraghav8/Solium)
 * SQL
   * [pgformatter](https://github.com/darold/pgFormatter)
+  * [sql-lint](https://github.com/joereynolds/sql-lint)
   * [sqlfmt](https://github.com/jackc/sqlfmt)
   * [sqlformat](https://github.com/andialbrecht/sqlparse)
   * [sqlint](https://github.com/purcell/sqlint)
-  * [sql-lint](https://github.com/joereynolds/sql-lint)
 * Stylus
   * [stylelint](https://github.com/stylelint/stylelint)
 * SugarSS
diff --git a/test/command_callback/inko_paths/test.inko b/test/command_callback/inko_paths/test.inko
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/command_callback/inko_paths/test.inko
diff --git a/test/command_callback/inko_paths/tests/test/test_foo.inko b/test/command_callback/inko_paths/tests/test/test_foo.inko
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/command_callback/inko_paths/tests/test/test_foo.inko
diff --git a/test/command_callback/test_erlang_erlc_command_callback.vader b/test/command_callback/test_erlang_erlc_command_callback.vader
new file mode 100644
index 00000000..7d659a07
--- /dev/null
+++ b/test/command_callback/test_erlang_erlc_command_callback.vader
@@ -0,0 +1,40 @@
+Before:
+  call ale#assert#SetUpLinterTest('erlang', 'erlc')
+
+After:
+  call ale#assert#TearDownLinterTest()
+
+Execute(The default command should be correct.):
+    let g:cmd = ale_linters#erlang#erlc#GetCommand(bufnr(''))
+    let g:regex = 'erlc.\+-o.\+%t'
+    let g:matched = match(g:cmd, g:regex)
+
+    " match returns -1 if not found
+    AssertNotEqual
+    \   g:matched,
+    \   -1,
+    \   'Command error: expected [' . g:cmd . '] to match [' . g:regex . ']'
+
+Execute(The command should accept configured executable.):
+    let b:ale_erlang_erlc_executable = '/usr/bin/erlc'
+    let g:cmd = ale_linters#erlang#erlc#GetCommand(bufnr(''))
+    let g:regex = '/usr/bin/erlc.\+-o.\+%t'
+    let g:matched = match(g:cmd, g:regex)
+
+    " match returns -1 if not found
+    AssertNotEqual
+    \   g:matched,
+    \   -1,
+    \   'Command error: expected [' . g:cmd . '] to match [' . g:regex . ']'
+
+Execute(The command should accept configured options.):
+    let b:ale_erlang_erlc_options = '-I include'
+    let g:cmd = ale_linters#erlang#erlc#GetCommand(bufnr(''))
+    let g:regex = 'erlc.\+-o.\+-I include.\+%t'
+    let g:matched = match(g:cmd, g:regex)
+
+    " match returns -1 if not found
+    AssertNotEqual
+    \   g:matched,
+    \   -1,
+    \   'Command error: expected [' . g:cmd . '] to match [' . g:regex . ']'
diff --git a/test/command_callback/test_fecs_command_callback.vader b/test/command_callback/test_fecs_command_callback.vader
index f70ad084..4287d324 100644
--- a/test/command_callback/test_fecs_command_callback.vader
+++ b/test/command_callback/test_fecs_command_callback.vader
@@ -1,5 +1,6 @@
 Before:
   call ale#assert#SetUpLinterTest('javascript', 'fecs')
+  runtime autoload/ale/handlers/fecs.vim
 
 After:
   call ale#assert#TearDownLinterTest()
diff --git a/test/command_callback/test_inko_inko_callbacks.vader b/test/command_callback/test_inko_inko_callbacks.vader
new file mode 100644
index 00000000..93295c91
--- /dev/null
+++ b/test/command_callback/test_inko_inko_callbacks.vader
@@ -0,0 +1,20 @@
+Before:
+  call ale#assert#SetUpLinterTest('inko', 'inko')
+  call ale#test#SetFilename('inko_paths/test.inko')
+
+After:
+  call ale#assert#TearDownLinterTest()
+
+Execute(The default executable path should be correct):
+  AssertLinter 'inko', ale#Escape('inko') . ' build --check --format=json %s'
+
+Execute(The inko callback should include tests/ for test paths):
+  call ale#engine#Cleanup(bufnr(''))
+  noautocmd e! inko_paths/tests/test/test_foo.inko
+  call ale#engine#InitBufferInfo(bufnr(''))
+
+  AssertLinter 'inko',
+  \ ale#Escape('inko')
+  \   . ' build --check --format=json --include '
+  \   . ale#Escape(ale#path#Simplify(g:dir . '/inko_paths/tests/'))
+  \   . ' %s'
diff --git a/test/handler/test_inko_handler.vader b/test/handler/test_inko_handler.vader
new file mode 100644
index 00000000..6621d2d6
--- /dev/null
+++ b/test/handler/test_inko_handler.vader
@@ -0,0 +1,54 @@
+Before:
+  runtime ale_linters/inko/inko.vim
+
+After:
+  call ale#linter#Reset()
+
+Execute(The inko handler should parse errors correctly):
+  AssertEqual
+  \ [
+  \   {
+  \     'filename': ale#path#Simplify('/tmp/foo.inko'),
+  \     'lnum': 4,
+  \     'col': 5,
+  \     'text': 'this is an error',
+  \     'type': 'E',
+  \   }
+  \ ],
+  \ ale#handlers#inko#Handle(bufnr(''), [
+  \ '[',
+  \ '  {',
+  \ '    "file": "/tmp/foo.inko",',
+  \ '    "line": 4,',
+  \ '    "column": 5,',
+  \ '    "message": "this is an error",',
+  \ '    "level": "error"',
+  \ '  }',
+  \ ']'
+  \ ])
+
+Execute(The inko handler should parse warnings correctly):
+  AssertEqual
+  \ [
+  \   {
+  \     'filename': ale#path#Simplify('/tmp/foo.inko'),
+  \     'lnum': 4,
+  \     'col': 5,
+  \     'text': 'this is a warning',
+  \     'type': 'W',
+  \   }
+  \ ],
+  \ ale#handlers#inko#Handle(bufnr(''), [
+  \ '[',
+  \ '  {',
+  \ '    "file": "/tmp/foo.inko",',
+  \ '    "line": 4,',
+  \ '    "column": 5,',
+  \ '    "message": "this is a warning",',
+  \ '    "level": "warning"',
+  \ '  }',
+  \ ']'
+  \ ])
+
+Execute(The inko handler should handle empty output):
+  AssertEqual [], ale#handlers#inko#Handle(bufnr(''), [])
diff --git a/test/script/check-duplicate-tags b/test/script/check-duplicate-tags
new file mode 100755
index 00000000..ec1de788
--- /dev/null
+++ b/test/script/check-duplicate-tags
@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+set -e
+
+grep --exclude=tags -roh '\*.*\*$' doc | sort | uniq -d
diff --git a/test/script/check-supported-tools-tables b/test/script/check-supported-tools-tables
index f4305707..d238e77f 100755
--- a/test/script/check-supported-tools-tables
+++ b/test/script/check-supported-tools-tables
@@ -15,14 +15,13 @@ while read -r; do
     if [[ "$REPLY" =~ ^! ]]; then
         language="${REPLY/!/}"
     else
-        # shellcheck disable=SC2001
         echo "$language - $REPLY"
     fi
 done < <(
     grep '^\*\|^  *\*' doc/ale-supported-languages-and-tools.txt \
     | sed -e '1,2d' \
     | sed 's/^\* */!/' \
-    | sed 's/^ *\* *\|!!\|\^\|(.*)\|`//g' \
+    | sed -E 's/^ *\* *|!!|\^|\(.*\)|`//g' \
     | sed 's/ *$//'
 ) > "$doc_file"
 
@@ -30,13 +29,12 @@ while read -r; do
     if [[ "$REPLY" =~ ^! ]]; then
         language="${REPLY/!/}"
     else
-        # shellcheck disable=SC2001
         echo "$language - $REPLY"
     fi
 done < <(
     grep '^\*\|^  *\*' supported-tools.md \
     | sed 's/^\* */!/' \
-    | sed 's/^ *\* *\|:floppy_disk:\|:warning:\|(.*)\|\[\|\].*\|-n flag//g' \
+    | sed -E 's/^ *\* *|:floppy_disk:|:warning:|\(.*\)|\[|\].*|-n flag//g' \
     | sed 's/ *$//'
 ) > "$readme_file"
 
diff --git a/test/script/check-tag-alignment b/test/script/check-tag-alignment
new file mode 100755
index 00000000..d41db160
--- /dev/null
+++ b/test/script/check-tag-alignment
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+exit_code=0
+
+# Documentation tags need to be aligned to the right margin, so look for
+# tags which aren't at the right margin.
+grep ' \*[^*]\+\*$' doc/ -r \
+    | awk '{ sep = index($0, ":"); if (length(substr($0, sep + 1 )) < 79) { print } }' \
+    | grep . && exit_code=1
+
+exit $exit_code
diff --git a/test/script/check-tag-references b/test/script/check-tag-references
new file mode 100755
index 00000000..45e741fb
--- /dev/null
+++ b/test/script/check-tag-references
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+set -e
+
+exit_code=0
+tag_regex='[gb]\?:\?\(ale\|ALE\)[a-zA-Z_\-]\+'
+
+tags="$(mktemp -t tags.XXXXXXXX)"
+refs="$(mktemp -t refs.XXXXXXXX)"
+# Grep for tags and references, and complain if we find a reference without
+# a tag for the reference. Only our tags will be included.
+grep --exclude=tags -roh "\\*$tag_regex\\*" doc | sed 's/*//g' | sort -u > "$tags"
+grep --exclude=tags -roh "|$tag_regex|" doc | sed 's/|//g' | sort -u > "$refs"
+
+exit_code=0
+
+if ! [[ $(comm -23 $refs $tags | wc -l) -eq 0 ]]; then
+  exit_code=1
+fi
+
+rm "$tags"
+rm "$refs"
diff --git a/test/script/check-toc b/test/script/check-toc
index 87a61262..f3f8a9ea 100755
--- a/test/script/check-toc
+++ b/test/script/check-toc
@@ -35,7 +35,7 @@ sed -n "$toc_start_line,$toc_end_line"p doc/ale.txt \
     > "$toc_file"
 
 # Get all of the doc files in a natural sorted order.
-doc_files="$(/usr/bin/env ls -1v doc | grep ^ale- | sed 's/^/doc\//' | paste -sd ' ' -)"
+doc_files="$(/usr/bin/env ls -1v doc | grep '^ale-' | sed 's/^/doc\//' | paste -sd ' ' -)"
 
 # shellcheck disable=SC2086
 grep -h '\*ale-.*-options\|^[a-z].*\*ale-.*\*$' $doc_files \
diff --git a/test/script/custom-checks b/test/script/custom-checks
index ca9069e4..83afb28c 100755
--- a/test/script/custom-checks
+++ b/test/script/custom-checks
@@ -13,7 +13,7 @@ echo 'Custom warnings/errors follow:'
 echo
 
 set -o pipefail
-docker run -a stdout "${docker_flags[@]}" test/script/custom-linting-rules . || exit_code=$?
+docker run "${docker_flags[@]}" test/script/custom-linting-rules . || exit_code=$?
 set +o pipefail
 echo
 
@@ -23,7 +23,10 @@ echo '========================================'
 echo 'Duplicate tags follow:'
 echo
 
-grep --exclude=tags -roh '\*.*\*$' doc | sort | uniq -d || exit_code=$?
+set -o pipefail
+docker run "${docker_flags[@]}" test/script/check-duplicate-tags . || exit_code=$?
+set +o pipefail
+echo
 
 echo '========================================'
 echo 'Checking for invalid tag references'
@@ -31,14 +34,9 @@ echo '========================================'
 echo 'Invalid tag references tags follow:'
 echo
 
-tag_regex='[gb]\?:\?\(ale\|ALE\)[a-zA-Z_\-]\+'
-
-# Grep for tags and references, and complain if we find a reference without
-# a tag for the reference. Only our tags will be included.
-diff -u \
-    <(grep --exclude=tags -roh "\\*$tag_regex\\*" doc | sort -u | sed 's/*//g') \
-    <(grep --exclude=tags -roh "|$tag_regex|" doc | sort -u | sed 's/|//g') \
-    | grep '^+[^+]' && exit_code=1
+set -o pipefail
+docker run "${docker_flags[@]}" test/script/check-tag-references || exit_code=$?
+set +o pipefail
 
 echo '========================================'
 echo 'diff supported-tools.md and doc/ale-supported-languages-and-tools.txt tables'
@@ -46,7 +44,9 @@ echo '========================================'
 echo 'Differences follow:'
 echo
 
-test/script/check-supported-tools-tables || exit_code=$?
+set -o pipefail
+docker run "${docker_flags[@]}" test/script/check-supported-tools-tables || exit_code=$?
+set +o pipefail
 
 echo '========================================'
 echo 'Look for badly aligned doc tags'
@@ -54,18 +54,18 @@ echo '========================================'
 echo 'Badly aligned tags follow:'
 echo
 
-# Documentation tags need to be aligned to the right margin, so look for
-# tags which aren't at the right margin.
-grep ' \*[^*]\+\*$' doc/ -r \
-    | awk '{ sep = index($0, ":"); if (length(substr($0, sep + 1 )) < 79) { print } }' \
-    | grep . && exit_code=1
+set -o pipefail
+docker run "${docker_flags[@]}" test/script/check-tag-alignment || exit_code=$?
+set +o pipefail
 
 echo '========================================'
 echo 'Look for table of contents issues'
 echo '========================================'
 echo
 
-test/script/check-toc || exit_code=$?
+set -o pipefail
+docker run "${docker_flags[@]}" test/script/check-toc || exit_code=$?
+set +o pipefail
 
 echo '========================================'
 echo 'Check Python code'
diff --git a/test/script/custom-linting-rules b/test/script/custom-linting-rules
index 981a9459..86294f71 100755
--- a/test/script/custom-linting-rules
+++ b/test/script/custom-linting-rules
@@ -53,17 +53,29 @@ check_errors() {
     regex="$1"
     message="$2"
     include_arg=''
+    exclude_arg=''
 
     if [ $# -gt 2 ]; then
         include_arg="--include $3"
     fi
 
+    if [ $# -gt 3 ]; then
+        shift
+        shift
+        shift
+
+        while (( "$#" )); do
+          exclude_arg="$exclude_arg --exclude $1"
+          shift
+        done
+    fi
+
     for directory in "${directories[@]}"; do
         # shellcheck disable=SC2086
         while read -r; do
             RETURN_CODE=1
             echo "$REPLY $message"
-        done < <(grep -H -n "$regex" $include_arg "$directory"/**/*.vim \
+        done < <(grep -H -n "$regex" $include_arg $exclude_arg "$directory"/**/*.vim \
             | grep -v 'no-custom-checks' \
             | grep -o '^[^:]\+:[0-9]\+' \
             | sed 's:^\./::')
@@ -92,7 +104,7 @@ if (( FIX_ERRORS )); then
     done
 fi
 
-# The arguments are: regex, explanation, [filename_filter]
+# The arguments are: regex, explanation, [filename_filter], [list, of, exclusions]
 check_errors \
     '^function.*) *$' \
     'Function without abort keyword (See :help except-compat)'
@@ -114,7 +126,10 @@ check_errors '==?' "Use 'is?' instead of '==?'. 0 ==? 'foobar' is true"
 check_errors '!=#' "Use 'isnot#' instead of '!=#'. 0 !=# 'foobar' is false"
 check_errors '!=?' "Use 'isnot?' instead of '!=?'. 0 !=? 'foobar' is false"
 check_errors '^ *:\?echo' "Stray echo line. Use \`execute echo\` if you want to echo something"
-check_errors $'name.:.*\'[a-z_]*[^a-z_0-9][a-z_0-9]*\',$' 'Use snake_case names for linters' '*/ale_linters/*'
+# Exclusions for grandfathered-in exceptions
+exclusions="clojure/clj_kondo.vim elixir/elixir_ls.vim go/golangci_lint.vim swift/swiftformat.vim"
+# shellcheck disable=SC2086
+check_errors $'name.:.*\'[a-z_]*[^a-z_0-9][a-z_0-9]*\',$' 'Use snake_case names for linters' '*/ale_linters/*' $exclusions
 # Checks for improving type checks.
 check_errors $'\\(==.\\?\\|is\\) type([\'"]\+)' "Use 'is v:t_string' instead"
 check_errors '\(==.\?\|is\) type([0-9]\+)' "Use 'is v:t_number' instead"
diff --git a/test/test_floating_preview.vader b/test/test_floating_preview.vader
new file mode 100644
index 00000000..43415556
--- /dev/null
+++ b/test/test_floating_preview.vader
@@ -0,0 +1,92 @@
+Before:
+  let g:ale_floating_preview = 0
+  let g:ale_hover_to_floating_preview = 0
+  let g:ale_detail_to_floating_preview = 0
+
+  runtime autoload/ale/floating_preview.vim
+
+  let g:floated_lines = []
+  let g:floating_preview_show_called = 0
+
+  " Stub out so we can track the call
+  function! ale#floating_preview#Show(lines, ...) abort
+    let g:floating_preview_show_called = 1
+    let g:floated_lines = a:lines
+  endfunction
+
+  let g:ale_buffer_info = {
+  \ bufnr('%'): {
+  \   'loclist': [
+  \     {
+  \       'lnum': 1,
+  \       'col': 10,
+  \       'bufnr': bufnr('%'),
+  \       'vcol': 0,
+  \       'linter_name': 'notalinter',
+  \       'nr': -1,
+  \       'type': 'E',
+  \       'code': 'semi',
+  \       'text': "Missing semicolon.\r",
+  \       'detail': "Every statement should end with a semicolon\nsecond line",
+  \     },
+  \   ],
+  \ }
+  \}
+
+  call ale#linter#Reset()
+  call ale#linter#PreventLoading('javascript')
+
+After:
+  Restore
+
+  let g:ale_floating_preview = 0
+  let g:ale_hover_to_floating_preview = 0
+  let g:ale_detail_to_floating_preview = 0
+
+  call cursor(1, 1)
+
+  let g:ale_buffer_info = {}
+
+  " Close the preview window if it's open.
+  if &filetype is# 'ale-preview'
+    noautocmd :q!
+  endif
+
+  call ale#linter#Reset()
+
+
+Given javascript(A file with warnings/errors):
+  var x = 3 + 12345678
+  var x = 5*2 + parseInt("10");
+  // comment
+
+Execute(Floating preview is used with ALEDetail when g:ale_floating_preview set):
+  let g:ale_floating_preview = 1
+
+  call cursor(1, 10)
+
+  ALEDetail
+
+  let expected = ["Every statement should end with a semicolon", "second line"]
+
+  AssertEqual 1, g:floating_preview_show_called
+  AssertEqual expected, g:floated_lines
+
+Execute(Floating preview is used with ALEDetail when g:ale_detail_to_floating_preview set):
+  let g:ale_detail_to_floating_preview = 1
+
+  call cursor(1, 10)
+
+  ALEDetail
+
+  let expected = ["Every statement should end with a semicolon", "second line"]
+
+  AssertEqual 1, g:floating_preview_show_called
+  AssertEqual expected, g:floated_lines
+
+Execute(Floating preview is not used with ALEDetail by default):
+  call cursor(1, 10)
+
+  ALEDetail
+
+  AssertEqual 0, g:floating_preview_show_called
diff --git a/test/test_hover.vader b/test/test_hover.vader
index ed756396..7a9c8d91 100644
--- a/test/test_hover.vader
+++ b/test/test_hover.vader
@@ -7,9 +7,25 @@ Before:
   let g:item_list = []
   let g:show_message_arg_list = []
 
+  let g:ale_floating_preview = 0
+  let g:ale_hover_to_floating_preview = 0
+  let g:ale_detail_to_floating_preview = 0
+
   runtime autoload/ale/linter.vim
   runtime autoload/ale/lsp.vim
+  runtime autoload/ale/lsp_linter.vim
   runtime autoload/ale/util.vim
+  runtime autoload/ale/floating_preview.vim
+  runtime autoload/ale/hover.vim
+
+  let g:floated_lines = []
+  let g:floating_preview_show_called = 0
+
+  " Stub out so we can track the call
+  function! ale#floating_preview#Show(lines, ...) abort
+    let g:floating_preview_show_called = 1
+    let g:floated_lines = a:lines
+  endfunction
 
   function! ale#lsp_linter#StartLSP(buffer, linter, callback) abort
     let g:Callback = a:callback
@@ -50,6 +66,7 @@ Before:
     \)
   endfunction
 
+
 After:
   call ale#hover#SetMap({})
   call ale#test#RestoreDirectory()
@@ -65,6 +82,7 @@ After:
   runtime autoload/ale/lsp_linter.vim
   runtime autoload/ale/lsp.vim
   runtime autoload/ale/util.vim
+  runtime autoload/ale/floating_preview.vim
 
 Given python(Some Python file):
   foo
@@ -168,6 +186,28 @@ Execute(LSP hover response with lists of strings and marked strings should be ha
   \], g:show_message_arg_list
   AssertEqual {}, ale#hover#GetMap()
 
+Execute(LSP hover with ale_floating_preview should float):
+  let g:ale_floating_preview = 1
+
+  call HandleValidLSPResult({'contents': "the message\ncontinuing"})
+
+  AssertEqual 1, g:floating_preview_show_called
+  AssertEqual ["the message", "continuing"], g:floated_lines
+
+Execute(LSP hover ale_hover_to_floating_preview should float):
+  let g:ale_hover_to_floating_preview = 1
+
+  call HandleValidLSPResult({'contents': "the message\ncontinuing"})
+
+  AssertEqual 1, g:floating_preview_show_called
+  AssertEqual ["the message", "continuing"], g:floated_lines
+
+
+Execute(LSP hover by default should not float):
+  call HandleValidLSPResult({'contents': "the message\ncontinuing"})
+
+  AssertEqual 0, g:floating_preview_show_called
+
 Execute(tsserver responses for documentation requests should be handled):
   call ale#hover#SetMap({3: {'show_documentation': 1, 'buffer': bufnr('')}})
 
@@ -187,3 +227,46 @@ Execute(tsserver responses for documentation requests should be handled):
   " The preview window should show the text.
   AssertEqual ['foo is a very good method'], ale#test#GetPreviewWindowText()
   silent! pclose
+
+Execute(hover with show_documentation should be in the preview window, not floating):
+  let g:ale_hover_to_floating_preview = 1
+  let g:ale_floating_preview = 1
+
+  call ale#hover#SetMap({3: {'show_documentation': 1, 'buffer': bufnr('')}})
+
+  call ale#hover#HandleTSServerResponse(
+  \ 1,
+  \ {
+  \   'command': 'quickinfo',
+  \   'request_seq': 3,
+  \   'success': v:true,
+  \   'body': {
+  \     'documentation': 'foo is a very good method',
+  \     'displayString': 'foo bar ',
+  \   },
+  \ }
+  \)
+
+  let expected = ["Every statement should end with a semicolon", "second line"]
+
+  AssertEqual 0, g:floating_preview_show_called
+
+Execute(TSServer hover without show_documentation and ale_floating_preview should float):
+  let g:ale_floating_preview = 1
+
+  call ale#hover#SetMap({3: {'buffer': bufnr('')}})
+
+  call ale#hover#HandleTSServerResponse(
+  \ 1,
+  \ {
+  \   'command': 'quickinfo',
+  \   'request_seq': 3,
+  \   'success': v:true,
+  \   'body': {
+  \     'displayString': "the message\ncontinuing",
+  \   },
+  \ }
+  \)
+
+  AssertEqual 1, g:floating_preview_show_called
+  AssertEqual ["the message", "continuing"], g:floated_lines