fix: Remove explicit calls to file path in astyle

autoload/ale/fixers/astyle.vim

@@ -21,10 +21,11 @@ function! ale#fixers#astyle#Fix(buffer) abort
     let l:executable = ale#fixers#astyle#Var(a:buffer, 'executable')
     let l:filename = ale#Escape(bufname(a:buffer))
     let l:options = ale#fixers#astyle#Var(a:buffer, 'options')
-    let l:command = ' --stdin=' . l:filename
+    let l:command = ' --stdin='
 
     return {
-    \   'command': ale#Escape(l:executable) . l:command
+    \   'command': ale#Escape(l:executable)
     \     . (empty(l:options) ? '' : ' --project=' . l:options)
+    \     . l:command
     \}
 endfunction

test/fixers/test_astyle_fixer_callback.vader

@@ -20,7 +20,7 @@ Execute(The astyle callback should return the correct default values):
   AssertEqual
   \ {
   \   'command': ale#Escape(g:ale_c_astyle_executable)
-  \     . ' --stdin=' . ale#Escape(targetfile)
+  \     . ' --stdin='
   \ },
   \ ale#fixers#astyle#Fix(bufnr(''))
 
@@ -32,7 +32,7 @@ Execute(The astyle callback should support cpp files):
   AssertEqual
   \ {
   \   'command': ale#Escape(g:ale_cpp_astyle_executable)
-  \     . ' --stdin=' . ale#Escape(targetfile)
+  \     . ' --stdin='
   \ },
   \ ale#fixers#astyle#Fix(bufnr(''))
 
@@ -45,8 +45,8 @@ Execute(The astyle callback should support cpp files with option file set):
   AssertEqual
   \ {
   \   'command': ale#Escape('invalidpp')
-  \     . ' --stdin=' . ale#Escape(targetfile)
   \     . ' --project=' . g:ale_cpp_astyle_options
+  \     . ' --stdin='
   \ },
   \ ale#fixers#astyle#Fix(bufnr(''))
 
@@ -59,7 +59,7 @@ Execute(The astyle callback should return the correct default values with an opt
   AssertEqual
   \ {
   \   'command': ale#Escape('xxxinvalid')
-  \     . ' --stdin=' . ale#Escape(targetfile)
   \     . ' --project=' . g:ale_c_astyle_options
+  \     . ' --stdin='
   \ },
   \ ale#fixers#astyle#Fix(bufnr(''))