Add GCC linter for Ada

6 files changed, 163 insertions, 0 deletions

diff --git a/README.md b/README.md
index 4540ac9f..b6f1aa09 100644
--- a/README.md
+++ b/README.md
@@ -97,6 +97,7 @@ formatting.
 
 | Language | Tools |
 | -------- | ----- |
+| Ada | [gcc](https://gcc.gnu.org) |
 | ASM | [gcc](https://gcc.gnu.org) |
 | Ansible | [ansible-lint](https://github.com/willthames/ansible-lint) |
 | API Blueprint | [drafter](https://github.com/apiaryio/drafter) |
diff --git a/ale_linters/ada/gcc.vim b/ale_linters/ada/gcc.vim
new file mode 100644
index 00000000..d6f973ae
--- /dev/null
+++ b/ale_linters/ada/gcc.vim
@@ -0,0 +1,54 @@
+" Author: Martino Pilia <martino.pilia@gmail.com>
+" Description: Lint Ada files with GCC
+
+call ale#Set('ada_gcc_executable', 'gcc')
+
+" -gnatwa: activate most optional warnings
+" -gnatq: try semantic analysis even if syntax errors have been found
+call ale#Set('ada_gcc_options', '-gnatwa -gnatq')
+
+function! ale_linters#ada#gcc#GetCommand(buffer) abort
+    " Build a suitable output file name. The output file is specified because
+    " the .ali file may be created even if no code generation is attempted.
+    " The output file name must match the source file name (except for the
+    " extension), so here we cannot use the null file as output.
+    let l:tmp_dir = fnamemodify(ale#engine#CreateDirectory(a:buffer), ':p')
+    let l:out_file = l:tmp_dir . fnamemodify(bufname(a:buffer), ':t:r') . '.o'
+
+    " -gnatc: Check syntax and semantics only (no code generation attempted)
+    return '%e -x ada -c -gnatc'
+    \   . ' -o ' . ale#Escape(l:out_file)
+    \   . ' -I ' . ale#Escape(fnamemodify(bufname(a:buffer), ':p:h'))
+    \   . ale#Pad(ale#Var(a:buffer, 'ada_gcc_options'))
+    \   . ' %t'
+endfunction
+
+" For the message format please refer to:
+"   https://gcc.gnu.org/onlinedocs/gnat_ugn/Output-and-Error-Message-Control.html
+"   https://gcc.gnu.org/onlinedocs/gnat_ugn/Warning-Message-Control.html
+function! ale_linters#ada#gcc#Handle(buffer, lines) abort
+    " Error format: <filename>:<lnum>:<col>: <text>
+    " Warning format: <filename>:<lnum>:<col>: warning: <text>
+    let l:re = '\v(.+):([0-9]+):([0-9]+):\s+(warning:)?\s*(.+)\s*'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:re)
+        call add(l:output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': str2nr(l:match[2]),
+        \   'col': str2nr(l:match[3]),
+        \   'type': l:match[4] is# 'warning:' ? 'W' : 'E',
+        \   'text': l:match[5],
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('ada', {
+\   'name': 'gcc',
+\   'output_stream': 'stderr',
+\   'executable_callback': ale#VarFunc('ada_gcc_executable'),
+\   'command_callback': 'ale_linters#ada#gcc#GetCommand',
+\   'callback': 'ale_linters#ada#gcc#Handle',
+\})
diff --git a/doc/ale-ada.txt b/doc/ale-ada.txt
new file mode 100644
index 00000000..93e3261a
--- /dev/null
+++ b/doc/ale-ada.txt
@@ -0,0 +1,25 @@
+===============================================================================
+ALE Ada Integration                                           *ale-ada-options*
+
+
+===============================================================================
+gcc                                                               *ale-ada-gcc*
+
+g:ale_ada_gcc_executable                             *g:ale_ada_gcc_executable*
+                                                     *b:ale_ada_gcc_executable*
+  Type: |String|
+  Default: `'gcc'`
+
+This variable can be changed to use a different executable for gcc.
+
+
+g:ale_ada_gcc_options                                   *g:ale_ada_gcc_options*
+                                                        *b:ale_ada_gcc_options*
+  Type: |String|
+  Default: `'-gnatwa -gnatq'`
+
+  This variable can be set to pass additional options to gcc.
+
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:
diff --git a/doc/ale.txt b/doc/ale.txt
index 85f6b6f8..de054e4d 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -21,6 +21,8 @@ CONTENTS                                                         *ale-contents*
     6.1 Highlights........................|ale-highlights|
     6.2 Options for write-good Linter.....|ale-write-good-options|
   7. Integration Documentation............|ale-integrations|
+    ada...................................|ale-ada-options|
+      gcc.................................|ale-ada-gcc|
     ansible...............................|ale-ansible-options|
       ansible-lint........................|ale-ansible-ansible-lint|
     asciidoc..............................|ale-asciidoc-options|
@@ -392,6 +394,7 @@ Notes:
 `^` No linters for text or Vim help filetypes are enabled by default.
 `!!` These linters check only files on disk. See |ale-lint-file-linters|
 
+* Ada: `gcc`
 * ASM: `gcc`
 * Ansible: `ansible-lint`
 * API Blueprint: `drafter`
diff --git a/test/command_callback/test_ada_gcc_command_callbacks.vader b/test/command_callback/test_ada_gcc_command_callbacks.vader
new file mode 100644
index 00000000..de6e355e
--- /dev/null
+++ b/test/command_callback/test_ada_gcc_command_callbacks.vader
@@ -0,0 +1,44 @@
+Before:
+  call ale#assert#SetUpLinterTest('ada', 'gcc')
+  call ale#test#SetFilename('dummy.adb')
+
+  function! GetOutputDir(command) abort
+    let l:split_command = split(a:command)
+    let l:index = index(l:split_command, '-o')
+    return l:split_command[l:index + 1]
+  endfunction
+
+  let b:out_file = GetOutputDir(ale_linters#ada#gcc#GetCommand(bufnr('')))
+
+After:
+  delfunction GetOutputDir
+
+  unlet! b:out_file
+
+  call ale#assert#TearDownLinterTest()
+
+Execute(The executable should be configurable):
+
+  AssertLinter 'gcc',
+  \ ale#Escape('gcc') . ' -x ada -c -gnatc'
+  \ . ' -o ' . b:out_file
+  \ . ' -I ' . ale#Escape(getcwd())
+  \ . ' -gnatwa -gnatq %t'
+
+  let b:ale_ada_gcc_executable = 'foo'
+
+  AssertLinter 'foo',
+  \ ale#Escape('foo') . ' -x ada -c -gnatc'
+  \ . ' -o ' . b:out_file
+  \ . ' -I ' . ale#Escape(getcwd())
+  \ . ' -gnatwa -gnatq %t'
+
+Execute(The options should be configurable):
+
+  let g:ale_ada_gcc_options = '--foo --bar'
+
+  AssertLinter 'gcc',
+  \ ale#Escape('gcc') . ' -x ada -c -gnatc'
+  \ . ' -o ' . b:out_file
+  \ . ' -I ' . ale#Escape(getcwd())
+  \ . ' --foo --bar %t'
diff --git a/test/handler/test_ada_gcc_handler.vader b/test/handler/test_ada_gcc_handler.vader
new file mode 100644
index 00000000..06ddfe1f
--- /dev/null
+++ b/test/handler/test_ada_gcc_handler.vader
@@ -0,0 +1,36 @@
+Before:
+  runtime ale_linters/ada/gcc.vim
+
+After:
+  call ale#linter#Reset()
+
+Execute(The gcc handler for Ada should parse input correctly):
+  AssertEqual
+  \ [
+  \   {
+  \     'bufnr': 0,
+  \     'lnum': 8,
+  \     'col': 5,
+  \     'type': 'W',
+  \     'text': 'variable "X" is assigned but never read',
+  \   },
+  \   {
+  \     'bufnr': 0,
+  \     'lnum': 6,
+  \     'col': 22,
+  \     'type': 'E',
+  \     'text': 'type definition expected',
+  \   },
+  \   {
+  \     'bufnr': 0,
+  \     'lnum': 8,
+  \     'col': 9,
+  \     'type': 'E',
+  \     'text': 'aspect specifications not allowed here',
+  \   },
+  \ ],
+  \ ale_linters#ada#gcc#Handle(0, [
+  \   'foobar.adb:8:05: warning: variable "X" is assigned but never read',
+  \   'foobar.ads:6:22: type definition expected',
+  \   'foobar.ads:8:09: aspect specifications not allowed here',
+  \ ])