#729 - Use a wrapper for simplify to fix // problems on Windows

autoload/ale/c.vim

@@ -47,7 +47,7 @@ function! ale#c#FindLocalHeaderPaths(buffer) abort
 
     " If we find an 'include' directory in the project root, then use that.
     if isdirectory(l:project_root . '/include')
-        return [simplify(l:project_root . '/include')]
+        return [ale#path#Simplify(l:project_root . '/include')]
     endif
 
     return []

autoload/ale/path.vim

@@ -1,6 +1,12 @@
 " Author: w0rp <devw0rp@gmail.com>
 " Description: Functions for working with paths in the filesystem.
 
+function! ale#path#Simplify(path) abort
+    " //foo is turned into / to stop Windows doing stupid things with search
+    " paths.
+    return substitute(simplify(a:path), '^//\+', '/', 'g') " no-custom-checks
+endfunction
+
 " Given a buffer and a filename, find the nearest file by searching upwards
 " through the paths relative to the given buffer.
 function! ale#path#FindNearestFile(buffer, filename) abort
@@ -89,7 +95,7 @@ function! ale#path#IsBufferPath(buffer, complex_filename) abort
         return 1
     endif
 
-    let l:test_filename = simplify(a:complex_filename)
+    let l:test_filename = ale#path#Simplify(a:complex_filename)
 
     if l:test_filename[:1] ==# './'
         let l:test_filename = l:test_filename[2:]
@@ -115,7 +121,7 @@ endfunction
 function! ale#path#Upwards(path) abort
     let l:pattern = ale#Has('win32') ? '\v/+|\\+' : '\v/+'
     let l:sep = ale#Has('win32') ? '\' : '/'
-    let l:parts = split(simplify(a:path), l:pattern)
+    let l:parts = split(ale#path#Simplify(a:path), l:pattern)
     let l:path_list = []
 
     while !empty(l:parts)
@@ -128,8 +134,8 @@ function! ale#path#Upwards(path) abort
         let l:path_list[-1] .= '\'
     elseif a:path[0] ==# '/'
         " If the path starts with /, even on Windows, add / and / to all paths.
-        call add(l:path_list, '')
         call map(l:path_list, '''/'' . v:val')
+        call add(l:path_list, '/')
     endif
 
     return l:path_list

autoload/ale/python.vim

@@ -28,10 +28,15 @@ endfunction
 " Given a buffer number, find a virtualenv path for Python.
 function! ale#python#FindVirtualenv(buffer) abort
     for l:path in ale#path#Upwards(expand('#' . a:buffer . ':p:h'))
-        for l:dirname in ale#Var(a:buffer, 'virtualenv_dir_names')
-            let l:venv_dir = simplify(l:path . '/' . l:dirname)
+        " Skip empty path components returned in MSYS.
+        if empty(l:path)
+            continue
+        endif
 
-            if filereadable(simplify(l:venv_dir . '/' . s:bin_dir . '/activate'))
+        for l:dirname in ale#Var(a:buffer, 'virtualenv_dir_names')
+            let l:venv_dir = ale#path#Simplify(l:path . '/' . l:dirname)
+
+            if filereadable(ale#path#Simplify(l:venv_dir . '/' . s:bin_dir . '/activate'))
                 return l:venv_dir
             endif
         endfor
@@ -52,7 +57,7 @@ function! ale#python#FindExecutable(buffer, base_var_name, path_list) abort
 
     if !empty(l:virtualenv)
         for l:path in a:path_list
-            let l:ve_executable = simplify(l:virtualenv . '/' . s:bin_dir . '/' . l:path)
+            let l:ve_executable = ale#path#Simplify(l:virtualenv . '/' . s:bin_dir . '/' . l:path)
 
             if executable(l:ve_executable)
                 return l:ve_executable

autoload/ale/test.vim

@@ -15,5 +15,5 @@ function! ale#test#SetFilename(path) abort
         let l:dir = getcwd()
     endif
 
-    silent noautocmd execute 'file ' . fnameescape(simplify(l:dir . '/' . a:path))
+    silent noautocmd execute 'file ' . fnameescape(ale#path#Simplify(l:dir . '/' . a:path))
 endfunction

custom-checks

@@ -78,6 +78,7 @@ check_errors $'\t' 'Use four spaces, not tabs'
 # This check should prevent people from using a particular inconsistent name.
 check_errors 'let g:ale_\w\+_\w\+_args =' 'Name your option g:ale_<filetype>_<lintername>_options instead'
 check_errors 'shellescape(' 'Use ale#Escape instead of shellescape'
+check_errors 'simplify(' 'Use ale#path#Simplify instead of simplify'
 check_errors "expand(['\"]%" "Use expand('#' . a:buffer . '...') instead. You might get a filename for the wrong buffer."
 
 exit $RETURN_CODE

test/test_path_upwards.vader

@@ -44,3 +44,7 @@ Execute(ale#path#Upwards should return the correct path components for Windows):
   \ ale#path#Upwards('foo//..///foo2////bar')
   " Expect an empty List for empty strings.
   AssertEqual [], ale#path#Upwards('')
+  " Paths starting with // return /
+  AssertEqual
+  \ ['/foo2\bar', '/foo2', '/'],
+  \ ale#path#Upwards('//foo//..///foo2////bar')