improve DMD handler (#3647)

* improve DMD handler

 - ignore errors from other files
 - catch 'Deprecation' as warning
 - add tests

* adding filename key instead of filtering

* update dmd test

* fix test dmd windows

2 files changed, 51 insertions, 5 deletions

diff --git a/ale_linters/d/dmd.vim b/ale_linters/d/dmd.vim
index 82668a21..f38e812c 100644
--- a/ale_linters/d/dmd.vim
+++ b/ale_linters/d/dmd.vim
@@ -87,15 +87,20 @@ function! ale_linters#d#dmd#Handle(buffer, lines) abort
     " Matches patterns lines like the following:
     " /tmp/tmp.qclsa7qLP7/file.d(1): Error: function declaration without return type. (Note that constructors are always named 'this')
     " /tmp/tmp.G1L5xIizvB.d(8,8): Error: module weak_reference is in file 'dstruct/weak_reference.d' which cannot be read
-    let l:pattern = '^[^(]\+(\([0-9]\+\)\,\?\([0-9]*\)): \([^:]\+\): \(.\+\)'
+    let l:pattern = '\v^(\f+)\((\d+)(,(\d+))?\): (\w+): (.+)$'
     let l:output = []
+    let l:dir = expand('#' . a:buffer . ':p:h')
 
     for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        " If dmd was invoked with relative path, match[1] is relative, otherwise it is absolute.
+        " As we invoke dmd with the buffer path (in /tmp), this will generally be absolute already
+        let l:fname = ale#path#GetAbsPath(l:dir, l:match[1])
         call add(l:output, {
-        \   'lnum': l:match[1],
-        \   'col': l:match[2],
-        \   'type': l:match[3] is# 'Warning' ? 'W' : 'E',
-        \   'text': l:match[4],
+        \   'filename': l:fname,
+        \   'lnum': l:match[2],
+        \   'col': l:match[4],
+        \   'type': l:match[5] is# 'Warning' || l:match[5] is# 'Deprecation' ? 'W' : 'E',
+        \   'text': l:match[6],
         \})
     endfor
 
diff --git a/test/handler/test_dmd_handler.vader b/test/handler/test_dmd_handler.vader
new file mode 100644
index 00000000..32a04982
--- /dev/null
+++ b/test/handler/test_dmd_handler.vader
@@ -0,0 +1,41 @@
+Before:
+  runtime ale_linters/d/dmd.vim
+  call ale#test#SetDirectory('/testplugin/test/dmd')
+  call ale#test#SetFilename('test.d')
+
+After:
+  call ale#linter#Reset()
+  call ale#test#RestoreDirectory()
+
+Execute(Basic errors should be handled by dmd):
+  AssertEqual
+  \ [
+  \   {
+  \     'filename': ale#path#Simplify(g:dir . '/test.d'),
+  \     'lnum': '5',
+  \     'col' : '8',
+  \     'type': 'E',
+  \     'text': 'module weak_reference is in file ''dstruct/weak_reference.d'' which cannot be read'
+  \   },
+  \   {
+  \     'filename': ale#path#Simplify(g:dir . '/test.d'),
+  \     'lnum': '20',
+  \     'col' : '10',
+  \     'type': 'W',
+  \     'text': 'function test.thisoldfunc is deprecated'
+  \   },
+  \   {
+  \     'filename': ale#path#Simplify(g:dir . '/foo.d'),
+  \     'lnum': '230',
+  \     'col' : '9',
+  \     'type': 'W',
+  \     'text': 'statement is not reachable'
+  \   }
+  \ ],
+  \ ale_linters#d#dmd#Handle(bufnr(''), [
+  \ 'test.d(5,8): Error: module weak_reference is in file ''dstruct/weak_reference.d'' which cannot be read',
+  \ 'import path[0] = source',
+  \ 'import path[1] = /usr/include/dlang/dmd',
+  \ ale#path#Simplify(g:dir . '/test.d') . '(20,10): Deprecation: function test.thisoldfunc is deprecated',
+  \ 'foo.d(230,9): Warning: statement is not reachable',
+  \ ])