Add SQL linter sqlint, closes #395 (#472)

README.md

@@ -101,6 +101,7 @@ name. That seems to be the fairest way to arrange this table.
 | Scala | [scalac](http://scala-lang.org) |
 | Slim | [slim-lint](https://github.com/sds/slim-lint)
 | SML | [smlnj](http://www.smlnj.org/) |
+| SQL | [sqlint](https://github.com/purcell/sqlint) |
 | Swift | [swiftlint](https://swift.org/) |
 | Tex | [proselint](http://proselint.com/) |
 | Texinfo | [proselint](http://proselint.com/)|

ale_linters/sql/sqlint.vim

@@ -0,0 +1,34 @@
+" Author: Adriaan Zonnenberg <amz@adriaan.xyz>
+" Description: sqlint for SQL files
+
+function! ale_linters#sql#sqlint#Handle(buffer, lines) abort
+    " Matches patterns like the following:
+    "
+    " stdin:3:1:ERROR syntax error at or near "WIBBLE"
+    let l:pattern = '\v^[^:]+:(\d+):(\d+):(\u+) (.*)'
+    let l:output = []
+
+    for l:line in a:lines
+        let l:match = matchlist(l:line, l:pattern)
+
+        if empty(l:match)
+            continue
+        endif
+
+        call add(l:output, {
+        \   'lnum': l:match[1] + 0,
+        \   'col': l:match[2] + 0,
+        \   'type': l:match[3][0],
+        \   'text': l:match[4],
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('sql', {
+\   'name': 'sqlint',
+\   'executable': 'sqlint',
+\   'command': 'sqlint',
+\   'callback': 'ale_linters#sql#sqlint#Handle',
+\})

doc/ale.txt

@@ -153,6 +153,7 @@ The following languages and tools are supported.
 * Scala: 'scalac'
 * Slim: 'slim-lint'
 * SML: 'smlnj'
+* SQL: 'sqlint'
 * Swift: 'swiftlint'
 * Tex: 'proselint'
 * Texinfo: 'proselint'

test/handler/test_sqlint_handler.vader

@@ -0,0 +1,33 @@
+Execute(The sqlint handler should parse lines correctly):
+  runtime! ale_linters/sql/sqlint.vim
+
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 3,
+  \     'col': 1,
+  \     'text': 'syntax error at or near "WIBBLE"',
+  \     'type': 'E',
+  \   },
+  \   {
+  \     'lnum': 47,
+  \     'col': 11,
+  \     'text': 'unterminated quoted string at or near "''',
+  \     'type': 'E',
+  \   },
+  \   {
+  \     'lnum': 50,
+  \     'col': 12,
+  \     'text': 'some warning at end of input',
+  \     'type': 'W',
+  \   },
+  \ ],
+  \ ale_linters#sql#sqlint#Handle(347, [
+  \   'This line should be ignored completely',
+  \   'stdin:3:1:ERROR syntax error at or near "WIBBLE"',
+  \   'stdin:47:11:ERROR unterminated quoted string at or near "''',
+  \   'stdin:50:12:WARNING some warning at end of input',
+  \ ])
+
+After:
+  call ale#linter#Reset()