Add support for parsing compile_commands.json files for C compilers

8 files changed, 183 insertions, 184 deletions

diff --git a/test/command_callback/test_c_clang_command_callbacks.vader b/test/command_callback/test_c_clang_command_callbacks.vader
index 87f7fd06..7d2ff0bf 100644
--- a/test/command_callback/test_c_clang_command_callbacks.vader
+++ b/test/command_callback/test_c_clang_command_callbacks.vader
@@ -1,4 +1,7 @@
 Before:
+  Save g:ale_c_parse_makefile
+  let g:ale_c_parse_makefile = 0
+
   call ale#assert#SetUpLinterTest('c', 'clang')
   let b:command_tail = ' -S -x c -fsyntax-only -iquote'
   \   . ' ' . ale#Escape(getcwd())
diff --git a/test/command_callback/test_c_gcc_command_callbacks.vader b/test/command_callback/test_c_gcc_command_callbacks.vader
index 45514051..1f51c3bc 100644
--- a/test/command_callback/test_c_gcc_command_callbacks.vader
+++ b/test/command_callback/test_c_gcc_command_callbacks.vader
@@ -1,4 +1,7 @@
 Before:
+  Save g:ale_c_parse_makefile
+  let g:ale_c_parse_makefile = 0
+
   call ale#assert#SetUpLinterTest('c', 'gcc')
 
   let b:command_tail = ' -S -x c -fsyntax-only -iquote'
diff --git a/test/command_callback/test_cpp_clang_command_callbacks.vader b/test/command_callback/test_cpp_clang_command_callbacks.vader
index 3a5ea945..e96fd8e7 100644
--- a/test/command_callback/test_cpp_clang_command_callbacks.vader
+++ b/test/command_callback/test_cpp_clang_command_callbacks.vader
@@ -1,4 +1,7 @@
 Before:
+  Save g:ale_c_parse_makefile
+  let g:ale_c_parse_makefile = 0
+
   call ale#assert#SetUpLinterTest('cpp', 'clang')
   let b:command_tail = ' -S -x c++ -fsyntax-only -iquote'
   \   . ' ' . ale#Escape(getcwd())
diff --git a/test/command_callback/test_cpp_gcc_command_callbacks.vader b/test/command_callback/test_cpp_gcc_command_callbacks.vader
index f9fad8c8..0a86df4f 100644
--- a/test/command_callback/test_cpp_gcc_command_callbacks.vader
+++ b/test/command_callback/test_cpp_gcc_command_callbacks.vader
@@ -1,4 +1,7 @@
 Before:
+  Save g:ale_c_parse_makefile
+  let g:ale_c_parse_makefile = 0
+
   call ale#assert#SetUpLinterTest('cpp', 'gcc')
   let b:command_tail = ' -S -x c++ -fsyntax-only -iquote'
   \   . ' ' . ale#Escape(getcwd())
diff --git a/test/test_c_flag_parsing.vader b/test/test_c_flag_parsing.vader
new file mode 100644
index 00000000..8bd805df
--- /dev/null
+++ b/test/test_c_flag_parsing.vader
@@ -0,0 +1,161 @@
+Before:
+  Save g:ale_c_parse_makefile
+
+  call ale#test#SetDirectory('/testplugin/test')
+
+  let g:ale_c_parse_makefile = 1
+
+After:
+  Restore
+
+  call ale#test#RestoreDirectory()
+
+Execute(The CFlags parser should be able to parse include directives):
+  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
+
+  AssertEqual
+  \ ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir')),
+  \ ale#c#ParseCFlagsFromMakeOutput(bufnr(''), ['gcc -Isubdir -c file.c'])
+
+Execute(The CFlags parser should be able to parse macro directives):
+  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
+
+  AssertEqual
+  \ ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir'))
+  \   . ' -DTEST=1',
+  \ ale#c#ParseCFlagsFromMakeOutput(bufnr(''), ['gcc -Isubdir -DTEST=1 -c file.c'])
+
+Execute(The CFlags parser should be able to parse macro directives with spaces):
+  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
+
+  AssertEqual
+  \ ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir'))
+  \   . ' -DTEST=$(( 2 * 4 ))',
+  \ ale#c#ParseCFlagsFromMakeOutput(bufnr(''), ['gcc -Isubdir -DTEST=$(( 2 * 4 )) -c file.c'])
+
+Execute(The CFlags parser should be able to parse shell directives with spaces):
+  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
+
+  AssertEqual
+  \ ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir'))
+  \   .  ' -DTEST=`date +%s`',
+  \ ale#c#ParseCFlagsFromMakeOutput(bufnr(''), ['gcc -Isubdir -DTEST=`date +%s` -c file.c'])
+
+Execute(ParseCFlags should be able to parse flags with relative paths):
+  AssertEqual
+  \ ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir'))
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include'))
+  \   . ' -DTEST=`date +%s`',
+  \ ale#c#ParseCFlags(
+  \   ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
+  \   'gcc -Isubdir  '
+  \     .  '-I'. ale#path#Simplify('kernel/include')
+  \     .  ' -DTEST=`date +%s` -c file.c'
+  \ )
+
+Execute(ParseCFlags should be able to parse -Dgoal):
+  AssertEqual
+  \ '-Dgoal=9'
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir'))
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include'))
+  \   . ' -DTEST=`date +%s`',
+  \ ale#c#ParseCFlags(
+  \   ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
+  \   'gcc -Dgoal=9 -Isubdir '
+  \     . '-I'. ale#path#Simplify('kernel/include')
+  \     . ' -DTEST=`date +%s` -c file.c'
+  \ )
+
+Execute(ParseCFlags should ignore -T and other arguments):
+  AssertEqual
+  \ '-Dgoal=9'
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir'))
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include'))
+  \   . ' -DTEST=`date +%s`',
+  \ ale#c#ParseCFlags(
+  \   ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
+  \   'gcc -Dgoal=9 -Tlinkerfile.ld blabla -Isubdir '
+  \     .  '-I'. ale#path#Simplify('kernel/include')
+  \     .  ' -DTEST=`date +%s` -c file.c'
+  \ )
+
+Execute(ParseCFlags should handle paths with spaces in double quotes):
+  AssertEqual
+  \ '-Dgoal=9'
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir'))
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/dir with spaces'))
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include'))
+  \   . ' -DTEST=`date +%s`',
+  \ ale#c#ParseCFlags(
+  \   ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
+  \   'gcc -Dgoal=9 -Tlinkerfile.ld blabla -Isubdir '
+  \     . '-I"dir with spaces"' . ' -I'. ale#path#Simplify('kernel/include')
+  \     . ' -DTEST=`date +%s` -c file.c'
+  \ )
+
+Execute(ParseCFlags should handle paths with spaces in single quotes):
+  AssertEqual
+  \ '-Dgoal=9'
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir'))
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/dir with spaces'))
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include'))
+  \   . ' -DTEST=`date +%s`',
+  \ ale#c#ParseCFlags(
+  \   ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
+  \   'gcc -Dgoal=9 -Tlinkerfile.ld blabla -Isubdir '
+  \     . '-I''dir with spaces''' . ' -I'. ale#path#Simplify('kernel/include')
+  \     . ' -DTEST=`date +%s` -c file.c'
+  \ )
+
+Execute(ParseCFlags should handle paths with minuses):
+  AssertEqual
+  \ '-Dgoal=9'
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir'))
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/dir with spaces'))
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/dir-with-dash'))
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include'))
+  \   . ' -DTEST=`date +%s`',
+  \ ale#c#ParseCFlags(
+  \   ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
+  \   'gcc -Dgoal=9 -Tlinkerfile.ld blabla -Isubdir '
+  \     . '-I''dir with spaces''' . ' -Idir-with-dash'
+  \     . ' -I'. ale#path#Simplify('kernel/include')
+  \     . ' -DTEST=`date +%s` -c file.c'
+  \ )
+
+Execute(ParseCFlags should handle -D with minuses):
+  AssertEqual
+  \ '-Dgoal=9'
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir'))
+  \   . ' -Dmacro-with-dash'
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/dir with spaces'))
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/dir-with-dash'))
+  \   . ' ' . ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include'))
+  \   . ' -DTEST=`date +%s`',
+  \ ale#c#ParseCFlags(
+  \   ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
+  \   'gcc -Dgoal=9 -Tlinkerfile.ld blabla -Isubdir '
+  \     . '-Dmacro-with-dash '
+  \     . '-I''dir with spaces''' . ' -Idir-with-dash'
+  \     . ' -I'. ale#path#Simplify('kernel/include')
+  \     . ' -DTEST=`date +%s` -c file.c'
+  \ )
+
+Execute(FlagsFromCompileCommands should tolerate empty values):
+  AssertEqual '', ale#c#FlagsFromCompileCommands(bufnr(''), '')
+
+Execute(ParseCompileCommandsFlags should tolerate empty values):
+  AssertEqual '', ale#c#ParseCompileCommandsFlags(bufnr(''), '', [])
+
+Execute(ParseCompileCommandsFlags should parse some basic flags):
+  noautocmd execute 'file! ' . fnameescape('/foo/bar/xmms2-mpris/src/xmms2-mpris.c')
+
+  AssertEqual
+  \ '-I/usr/include/xmms2',
+  \ ale#c#ParseCompileCommandsFlags(bufnr(''), '/foo/bar/xmms2-mpris', [
+  \   {
+  \     'directory': '/foo/bar/xmms2-mpris',
+  \     'command': '/usr/bin/cc  -I/usr/include/xmms2    -o CMakeFiles/xmms2-mpris.dir/src/xmms2-mpris.c.o   -c /foo/bar/xmms2-mpris/src/xmms2-mpris.c',
+  \     'file': '/foo/bar/xmms2-mpris/src/xmms2-mpris.c'
+  \   },
+  \ ])
diff --git a/test/test_c_import_paths.vader b/test/test_c_import_paths.vader
index 0490dec6..70b25070 100644
--- a/test/test_c_import_paths.vader
+++ b/test/test_c_import_paths.vader
@@ -2,6 +2,7 @@ Before:
   " Make sure the c.vim file is loaded first.
   call ale#c#FindProjectRoot(bufnr(''))
 
+  Save g:ale_c_parse_makefile
   Save g:ale_c_gcc_options
   Save g:ale_c_clang_options
   Save g:ale_cpp_gcc_options
@@ -19,6 +20,7 @@ Before:
 
   call ale#test#SetDirectory('/testplugin/test')
 
+  let g:ale_c_parse_makefile = 0
   let g:ale_c_gcc_options = ''
   let g:ale_c_clang_options = ''
   let g:ale_cpp_gcc_options = ''
diff --git a/test/test_c_parse_makefile.vader b/test/test_c_parse_makefile.vader
deleted file mode 100644
index 7c2fc21e..00000000
--- a/test/test_c_parse_makefile.vader
+++ /dev/null
@@ -1,184 +0,0 @@
-Before:
-  Save g:ale_c_parse_makefile
-  Save g:ale_c_gcc_options
-  Save g:ale_c_clang_options
-  Save g:ale_cpp_gcc_options
-  Save g:ale_cpp_clang_options
-
-  call ale#test#SetDirectory('/testplugin/test')
-
-  let g:ale_c_parse_makefile=1
-  let g:ale_c_gcc_options = ''
-  let g:ale_c_clang_options = ''
-  let g:ale_cpp_gcc_options = ''
-  let g:ale_cpp_clang_options = ''
-
-After:
-  Restore
-
-  call ale#test#RestoreDirectory()
-  call ale#linter#Reset()
-
-Execute(The CFlags parser should be able to parse include directives):
-  runtime! ale_linters/c/gcc.vim
-
-  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-
-  AssertEqual
-  \   [ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir'))]
-  \ , ale#c#ParseCFlags(bufnr(''), 'gcc -Isubdir -c file.c')
-
-Execute(The CFlags parser should be able to parse macro directives):
-  runtime! ale_linters/c/gcc.vim
-
-  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-
-  AssertEqual
-  \   [ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir')),
-  \    '-DTEST=1']
-  \ , ale#c#ParseCFlags(bufnr(''), 'gcc -Isubdir -DTEST=1 -c file.c')
-
-Execute(The CFlags parser should be able to parse macro directives with spaces):
-  runtime! ale_linters/c/gcc.vim
-
-  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-
-  AssertEqual
-  \   [ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir')),
-  \    '-DTEST=$(( 2 * 4 ))']
-  \ , ale#c#ParseCFlags(bufnr(''), 'gcc -Isubdir -DTEST=$(( 2 * 4 )) -c file.c')
-
-Execute(The CFlags parser should be able to parse shell directives with spaces):
-  runtime! ale_linters/c/gcc.vim
-
-  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-
-  AssertEqual
-  \   [ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir')),
-  \    '-DTEST=`date +%s`']
-  \ , ale#c#ParseCFlags(bufnr(''), 'gcc -Isubdir -DTEST=`date +%s` -c file.c')
-
-Execute(The CFlagsToList parser should be able to parse multiple cflags):
-  runtime! ale_linters/c/gcc.vim
-
-  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-
-  AssertEqual
-  \   [ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir')),
-  \    '-DTEST=`date +%s`']
-  \ , ale#c#ParseCFlagsToList(ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
-  \                           split('gcc -Isubdir -DTEST=`date +%s` -c file.c', '-'))
-
-Execute(The CFlagsToList parser should be able to parse multiple cflags #2):
-  runtime! ale_linters/c/gcc.vim
-
-  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-
-  AssertEqual
-  \   [ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir')),
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include')),
-  \    '-DTEST=`date +%s`']
-  \ , ale#c#ParseCFlagsToList(ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
-  \                           split('gcc -Isubdir  ' .
-  \                                 '-I'. ale#path#Simplify('kernel/include') .
-  \                                 ' -DTEST=`date +%s` -c file.c', '-'))
-
-Execute(The CFlagsToList parser should be able to parse multiple cflags #3):
-  runtime! ale_linters/c/gcc.vim
-
-  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-
-  AssertEqual
-  \   ['-Dgoal=9',
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir')),
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include')),
-  \    '-DTEST=`date +%s`']
-  \ , ale#c#ParseCFlagsToList(ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
-  \                           split('gcc -Dgoal=9 -Isubdir ' .
-  \                                 '-I'. ale#path#Simplify('kernel/include') .
-  \                                 ' -DTEST=`date +%s` -c file.c', '-'))
-
-Execute(The CFlagsToList parser should be able to parse multiple cflags #4):
-  runtime! ale_linters/c/gcc.vim
-
-  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-
-  AssertEqual
-  \   ['-Dgoal=9',
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir')),
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include')),
-  \    '-DTEST=`date +%s`']
-  \ , ale#c#ParseCFlagsToList(ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
-  \                           split('gcc -Dgoal=9 -Tlinkerfile.ld blabla -Isubdir ' .
-  \                                 '-I'. ale#path#Simplify('kernel/include') .
-  \                                 ' -DTEST=`date +%s` -c file.c', '-'))
-
-Execute(The CFlagsToList parser should be able to parse multiple cflags #5):
-  runtime! ale_linters/c/gcc.vim
-
-  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-
-  AssertEqual
-  \   ['-Dgoal=9',
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir')),
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/dir with spaces')),
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include')),
-  \    '-DTEST=`date +%s`']
-  \ , ale#c#ParseCFlagsToList(ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
-  \                           split('gcc -Dgoal=9 -Tlinkerfile.ld blabla -Isubdir ' .
-  \                                 '-I"dir with spaces"' . ' -I'. ale#path#Simplify('kernel/include') .
-  \                                 ' -DTEST=`date +%s` -c file.c', '-'))
-
-Execute(The CFlagsToList parser should be able to parse multiple cflags #6):
-  runtime! ale_linters/c/gcc.vim
-
-  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-
-  AssertEqual
-  \   ['-Dgoal=9',
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir')),
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/dir with spaces')),
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include')),
-  \    '-DTEST=`date +%s`']
-  \ , ale#c#ParseCFlagsToList(ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
-  \                           split('gcc -Dgoal=9 -Tlinkerfile.ld blabla -Isubdir ' .
-  \                                 '-I''dir with spaces''' . ' -I'. ale#path#Simplify('kernel/include') .
-  \                                 ' -DTEST=`date +%s` -c file.c', '-'))
-
-Execute(The CFlagsToList parser should be able to parse multiple cflags #7):
-  runtime! ale_linters/c/gcc.vim
-
-  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-
-  AssertEqual
-  \   ['-Dgoal=9',
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir')),
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/dir with spaces')),
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/dir-with-dash')),
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include')),
-  \    '-DTEST=`date +%s`']
-  \ , ale#c#ParseCFlagsToList(ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
-  \                           split('gcc -Dgoal=9 -Tlinkerfile.ld blabla -Isubdir ' .
-  \                                 '-I''dir with spaces''' . ' -Idir-with-dash' .
-  \                                 ' -I'. ale#path#Simplify('kernel/include') .
-  \                                 ' -DTEST=`date +%s` -c file.c', '-'))
-
-Execute(The CFlagsToList parser should be able to parse multiple cflags #8):
-  runtime! ale_linters/c/gcc.vim
-
-  call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
-
-  AssertEqual
-  \   ['-Dgoal=9',
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/subdir')),
-  \    '-Dmacro-with-dash',
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/dir with spaces')),
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/dir-with-dash')),
-  \    ale#Escape('-I' . ale#path#Simplify(g:dir. '/test_c_projects/makefile_project/kernel/include')),
-  \    '-DTEST=`date +%s`']
-  \ , ale#c#ParseCFlagsToList(ale#path#Simplify(g:dir. '/test_c_projects/makefile_project'),
-  \                           split('gcc -Dgoal=9 -Tlinkerfile.ld blabla -Isubdir ' .
-  \                                 '-Dmacro-with-dash ' .
-  \                                 '-I''dir with spaces''' . ' -Idir-with-dash' .
-  \                                 ' -I'. ale#path#Simplify('kernel/include') .
-  \                                 ' -DTEST=`date +%s` -c file.c', '-'))
diff --git a/test/test_path_dirname.vader b/test/test_path_dirname.vader
new file mode 100644
index 00000000..79b78d29
--- /dev/null
+++ b/test/test_path_dirname.vader
@@ -0,0 +1,8 @@
+Execute(ale#path#Dirname should return empty strings should be returned for empty values):
+  AssertEqual '', ale#path#Dirname('')
+  AssertEqual '', ale#path#Dirname(0)
+  AssertEqual '', ale#path#Dirname(v:null)
+
+Execute(ale#path#Dirname should return the dirname of paths):
+  AssertEqual '/foo', ale#path#Dirname('/foo/bar')
+  AssertEqual '/foo', ale#path#Dirname('/foo/bar/')