Detect .git directories for finding the project root for C projects

autoload/ale/c.vim

@@ -2,11 +2,18 @@
 " Description: Functions for integrating with C-family linters.
 
 function! ale#c#FindProjectRoot(buffer) abort
-    for l:project_filename in ['configure', 'Makefile', 'CMakeLists.txt']
+    for l:project_filename in ['.git/HEAD', 'configure', 'Makefile', 'CMakeLists.txt']
         let l:full_path = ale#path#FindNearestFile(a:buffer, l:project_filename)
 
         if !empty(l:full_path)
-            return fnamemodify(l:full_path, ':h')
+            let l:path = fnamemodify(l:full_path, ':h')
+
+            " Correct .git path detection.
+            if fnamemodify(l:path, ':t') ==# '.git'
+                let l:path = fnamemodify(l:path, ':h')
+            endif
+
+            return l:path
         endif
     endfor
 

test/test_c_import_paths.vader

@@ -19,11 +19,24 @@ After:
   unlet! g:dir
   call ale#linter#Reset()
 
+" Run this only once for this series of tests. The cleanup Execute step
+" will run at the bottom of this file.
+"
+" We need to move .git/HEAD away so we don't match it, as we need to test
+" functions which look for .git/HEAD.
+Execute(Move .git/HEAD to a temp dir):
+  let g:temp_head_filename = tempname()
+  let g:head_filename = findfile('.git/HEAD', ';')
+
+  if !empty(g:head_filename)
+    call writefile(readfile(g:head_filename, 'b'), g:temp_head_filename, 'b')
+    call delete(g:head_filename)
+  endif
+
 Execute(The C GCC handler should include 'include' directories for projects with a Makefile):
   runtime! ale_linters/c/gcc.vim
 
-  cd test_c_projects/makefile_project/subdir
+  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-  silent noautocmd file file.c
 
   AssertEqual
   \   'gcc -S -x c -fsyntax-only '
@@ -35,8 +48,7 @@ Execute(The C GCC handler should include 'include' directories for projects with
 Execute(The C GCC handler should include 'include' directories for projects with a configure file):
   runtime! ale_linters/c/gcc.vim
 
-  cd test_c_projects/configure_project/subdir
+  call ale#test#SetFilename('test_c_projects/configure_project/subdir/file.c')
-  silent noautocmd file file.c
 
   AssertEqual
   \   'gcc -S -x c -fsyntax-only '
@@ -48,8 +60,7 @@ Execute(The C GCC handler should include 'include' directories for projects with
 Execute(The C GCC handler should include root directories for projects with .h files in them):
   runtime! ale_linters/c/gcc.vim
 
-  cd test_c_projects/h_file_project/subdir
+  call ale#test#SetFilename('test_c_projects/h_file_project/subdir/file.c')
-  silent noautocmd file file.c
 
   AssertEqual
   \   'gcc -S -x c -fsyntax-only '
@@ -61,8 +72,7 @@ Execute(The C GCC handler should include root directories for projects with .h f
 Execute(The C GCC handler should include root directories for projects with .hpp files in them):
   runtime! ale_linters/c/gcc.vim
 
-  cd test_c_projects/hpp_file_project/subdir
+  call ale#test#SetFilename('test_c_projects/hpp_file_project/subdir/file.c')
-  silent noautocmd file file.c
 
   AssertEqual
   \   'gcc -S -x c -fsyntax-only '
@@ -74,8 +84,7 @@ Execute(The C GCC handler should include root directories for projects with .hpp
 Execute(The C Clang handler should include 'include' directories for projects with a Makefile):
   runtime! ale_linters/c/clang.vim
 
-  cd test_c_projects/makefile_project/subdir
+  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-  silent noautocmd file file.c
 
   AssertEqual
   \   'clang -S -x c -fsyntax-only '
@@ -87,8 +96,7 @@ Execute(The C Clang handler should include 'include' directories for projects wi
 Execute(The C Clang handler should include 'include' directories for projects with a configure file):
   runtime! ale_linters/c/clang.vim
 
-  cd test_c_projects/h_file_project/subdir
+  call ale#test#SetFilename('test_c_projects/h_file_project/subdir/file.c')
-  silent noautocmd file file.c
 
   AssertEqual
   \   'clang -S -x c -fsyntax-only '
@@ -100,8 +108,7 @@ Execute(The C Clang handler should include 'include' directories for projects wi
 Execute(The C Clang handler should include root directories for projects with .h files in them):
   runtime! ale_linters/c/clang.vim
 
-  cd test_c_projects/h_file_project/subdir
+  call ale#test#SetFilename('test_c_projects/h_file_project/subdir/file.c')
-  silent noautocmd file file.c
 
   AssertEqual
   \   'clang -S -x c -fsyntax-only '
@@ -113,8 +120,7 @@ Execute(The C Clang handler should include root directories for projects with .h
 Execute(The C Clang handler should include root directories for projects with .hpp files in them):
   runtime! ale_linters/c/clang.vim
 
-  cd test_c_projects/hpp_file_project/subdir
+  call ale#test#SetFilename('test_c_projects/hpp_file_project/subdir/file.c')
-  silent noautocmd file file.c
 
   AssertEqual
   \   'clang -S -x c -fsyntax-only '
@@ -126,8 +132,7 @@ Execute(The C Clang handler should include root directories for projects with .h
 Execute(The C++ GCC handler should include 'include' directories for projects with a Makefile):
   runtime! ale_linters/cpp/gcc.vim
 
-  cd test_c_projects/makefile_project/subdir
+  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.cpp')
-  silent noautocmd file file.cpp
 
   AssertEqual
   \   'gcc -S -x c++ -fsyntax-only '
@@ -139,8 +144,7 @@ Execute(The C++ GCC handler should include 'include' directories for projects wi
 Execute(The C++ GCC handler should include 'include' directories for projects with a configure file):
   runtime! ale_linters/cpp/gcc.vim
 
-  cd test_c_projects/configure_project/subdir
+  call ale#test#SetFilename('test_c_projects/configure_project/subdir/file.cpp')
-  silent noautocmd file file.cpp
 
   AssertEqual
   \   'gcc -S -x c++ -fsyntax-only '
@@ -152,8 +156,7 @@ Execute(The C++ GCC handler should include 'include' directories for projects wi
 Execute(The C++ GCC handler should include root directories for projects with .h files in them):
   runtime! ale_linters/cpp/gcc.vim
 
-  cd test_c_projects/h_file_project/subdir
+  call ale#test#SetFilename('test_c_projects/h_file_project/subdir/file.cpp')
-  silent noautocmd file file.cpp
 
   AssertEqual
   \   'gcc -S -x c++ -fsyntax-only '
@@ -165,8 +168,7 @@ Execute(The C++ GCC handler should include root directories for projects with .h
 Execute(The C++ GCC handler should include root directories for projects with .hpp files in them):
   runtime! ale_linters/cpp/gcc.vim
 
-  cd test_c_projects/hpp_file_project/subdir
+  call ale#test#SetFilename('test_c_projects/hpp_file_project/subdir/file.cpp')
-  silent noautocmd file file.cpp
 
   AssertEqual
   \   'gcc -S -x c++ -fsyntax-only '
@@ -178,8 +180,7 @@ Execute(The C++ GCC handler should include root directories for projects with .h
 Execute(The C++ Clang handler should include 'include' directories for projects with a Makefile):
   runtime! ale_linters/cpp/clang.vim
 
-  cd test_c_projects/makefile_project/subdir
+  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.cpp')
-  silent noautocmd file file.cpp
 
   AssertEqual
   \   'clang++ -S -x c++ -fsyntax-only '
@@ -191,8 +192,7 @@ Execute(The C++ Clang handler should include 'include' directories for projects
 Execute(The C++ Clang handler should include 'include' directories for projects with a configure file):
   runtime! ale_linters/cpp/clang.vim
 
-  cd test_c_projects/configure_project/subdir
+  call ale#test#SetFilename('test_c_projects/configure_project/subdir/file.cpp')
-  silent noautocmd file file.cpp
 
   AssertEqual
   \   'clang++ -S -x c++ -fsyntax-only '
@@ -204,8 +204,7 @@ Execute(The C++ Clang handler should include 'include' directories for projects
 Execute(The C++ Clang handler should include root directories for projects with .h files in them):
   runtime! ale_linters/cpp/clang.vim
 
-  cd test_c_projects/h_file_project/subdir
+  call ale#test#SetFilename('test_c_projects/h_file_project/subdir/file.cpp')
-  silent noautocmd file file.cpp
 
   AssertEqual
   \   'clang++ -S -x c++ -fsyntax-only '
@@ -217,8 +216,7 @@ Execute(The C++ Clang handler should include root directories for projects with
 Execute(The C++ Clang handler should include root directories for projects with .hpp files in them):
   runtime! ale_linters/cpp/clang.vim
 
-  cd test_c_projects/hpp_file_project/subdir
+  call ale#test#SetFilename('test_c_projects/hpp_file_project/subdir/file.cpp')
-  silent noautocmd file file.cpp
 
   AssertEqual
   \   'clang++ -S -x c++ -fsyntax-only '
@@ -227,17 +225,41 @@ Execute(The C++ Clang handler should include root directories for projects with
   \   . ' -'
   \ , ale_linters#cpp#clang#GetCommand(bufnr(''))
 
+Execute(The C++ Clang handler shoud use the include directory based on the .git location):
+  runtime! ale_linters/cpp/clang.vim
+
+  if !isdirectory(g:dir . '/test_c_projects/git_and_nested_makefiles/.git')
+    call mkdir(g:dir . '/test_c_projects/git_and_nested_makefiles/.git')
+  endif
+
+  if !filereadable(g:dir . '/test_c_projects/git_and_nested_makefiles/.git/HEAD')
+    call writefile([], g:dir . '/test_c_projects/git_and_nested_makefiles/.git/HEAD')
+  endif
+
+  call ale#test#SetFilename('test_c_projects/git_and_nested_makefiles/src/file.cpp')
+
+  AssertEqual
+  \   'clang++ -S -x c++ -fsyntax-only '
+  \   . '-iquote ' . ale#Escape(g:dir .  '/test_c_projects/git_and_nested_makefiles/src') . ' '
+  \   . ' -I' . ale#Escape(g:dir .  '/test_c_projects/git_and_nested_makefiles/include') . ' '
+  \   . ' -'
+  \ , ale_linters#cpp#clang#GetCommand(bufnr(''))
+
 Execute(The C++ ClangTidy handler should include json folders for projects with suitable build directory in them):
   runtime! ale_linters/cpp/clangtidy.vim
 
-  cd test_c_projects/json_project/subdir
+  call ale#test#SetFilename('test_c_projects/json_project/subdir/file.cpp')
-  silent noautocmd file file.cpp
-
-  " TODO Test to move to C-family tools tests
-  " AssertEqual
-  " \   '/testplugin/test/test_c_projects/json_project/build'
-  " \ , ale#c#FindCompileCommands(bufnr(''))
 
   AssertEqual
-  \   'clang-tidy -checks=''*'' %s -p ''/testplugin/test/test_c_projects/json_project/build'''
+  \   'clang-tidy -checks=''*'' %s '
+  \   . '-p ' . ale#Escape(g:dir . '/test_c_projects/json_project/build')
   \ , ale_linters#cpp#clangtidy#GetCommand(bufnr(''))
+
+Execute(Move .git/HEAD back):
+  if !empty(g:head_filename)
+    call writefile(readfile(g:temp_head_filename, 'b'), g:head_filename, 'b')
+    call delete(g:temp_head_filename)
+  endif
+
+  unlet! g:temp_head_filename
+  unlet! g:head_filename