Add linter for Inko

This adds a linter for Inko (https://inko-lang.org/). The linter makes
use of Inko's own compiler, and a newly introduced --check flag to only
check for errors; instead of also compiling source code.

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
+\})

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

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'],

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:

doc/ale-supported-languages-and-tools.txt

@@ -213,6 +213,8 @@ Notes:
   * `idris`
 * Ink
   * `ink-language-server`
+* Inko
+  * `inko` !!
 * ISPC
   * `ispc`!!
 * Java

doc/ale.txt

@@ -1502,6 +1502,7 @@ g:ale_linters                                                   *g:ale_linters*
   \   'go': ['gofmt', 'golint', 'go vet'],
   \   'hack': ['hack'],
   \   'help': [],
+  \   'inko': ['inko'],
   \   'perl': ['perlcritic'],
   \   'perl6': [],
   \   'python': ['flake8', 'mypy', 'pylint', 'pyright'],
@@ -2656,6 +2657,8 @@ 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|

supported-tools.md

@@ -222,6 +222,8 @@ 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

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'

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(''), [])