Added g:ale_php_phpstan_configuration option

ale_linters/php/phpstan.vim

@@ -4,6 +4,7 @@
 " Set to change the ruleset
 let g:ale_php_phpstan_executable = get(g:, 'ale_php_phpstan_executable', 'phpstan')
 let g:ale_php_phpstan_level = get(g:, 'ale_php_phpstan_level', '4')
+let g:ale_php_phpstan_configuration = get(g:, 'ale_php_phpstan_configuration', '')
 
 function! ale_linters#php#phpstan#GetExecutable(buffer) abort
     return ale#Var(a:buffer, 'php_phpstan_executable')
@@ -12,10 +13,16 @@ endfunction
 function! ale_linters#php#phpstan#GetCommand(buffer) abort
     let l:executable = ale_linters#php#phpstan#GetExecutable(a:buffer)
 
+    let l:configuration = ale#Var(a:buffer, 'php_phpstan_configuration')
+    let l:configuration_option = !empty(l:configuration)
+    \   ? ' -c ' . l:configuration
+    \   : ''
+
     return ale#Escape(l:executable)
     \   . ' analyze -l'
     \   . ale#Var(a:buffer, 'php_phpstan_level')
     \   . ' --errorFormat raw'
+    \   . l:configuration_option
     \   . ' %s'
 endfunction
 

doc/ale-php.txt

@@ -124,5 +124,13 @@ g:ale_php_phpstan_level                               *g:ale_php_phpstan_level*
   strictest.
 
 
+g:ale_php_phpstan_configuration               *g:ale_php_phpstan_configuration*
+                                              *b:ale_php_phpstan_configuration*
+  Type: |String|
+  Default: `''`
+
+  This variable sets path to phpstan configuration file.
+
+
 ===============================================================================
   vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

test/command_callback/test_phpstan_command_callbacks.vader

@@ -1,9 +1,11 @@
 Before:
   Save g:ale_php_phpstan_executable
   Save g:ale_php_phpstan_level
+  Save g:ale_php_phpstan_configuration
 
   unlet! g:ale_php_phpstan_executable
   unlet! g:ale_php_phpstan_level
+  unlet! g:ale_php_phpstan_configuration
 
   runtime ale_linters/php/phpstan.vim
 
@@ -27,3 +29,10 @@ Execute(project with level set to 3):
   AssertEqual
   \ ale#Escape('phpstan') . ' analyze -l3 --errorFormat raw %s',
   \ ale_linters#php#phpstan#GetCommand(bufnr(''))
+
+Execute(Custom phpstan configuration file):
+  let g:ale_php_phpstan_configuration = 'phpstan_config'
+
+  AssertEqual
+  \ ale#Escape('phpstan') . ' analyze -l4 --errorFormat raw -c phpstan_config %s',
+  \ ale_linters#php#phpstan#GetCommand(bufnr(''))