FIX #344 - Add options to Perl linter

Conflicts:
	doc/ale.txt

ale_linters/perl/perl.vim

@@ -1,6 +1,22 @@
 " Author: Vincent Lequertier <https://github.com/SkySymbol>
 " Description: This file adds support for checking perl syntax
 
+let g:ale_perl_perl_executable =
+\   get(g:, 'ale_perl_perl_executable', 'perl')
+
+let g:ale_perl_perl_options =
+\   get(g:, 'ale_perl_perl_options', '-X -c -Mwarnings -Ilib')
+
+function! ale_linters#perl#perl#GetExecutable(buffer) abort
+    return g:ale_perl_perl_executable
+endfunction
+
+function! ale_linters#perl#perl#GetCommand(buffer) abort
+    return ale_linters#perl#perl#GetExecutable(a:buffer)
+    \   . ' ' . g:ale_perl_perl_options
+    \   . ' %t'
+endfunction
+
 function! ale_linters#perl#perl#Handle(buffer, lines) abort
     let l:pattern = '\(.\+\) at \(.\+\) line \(\d\+\)'
     let l:output = []
@@ -32,8 +48,8 @@ endfunction
 
 call ale#linter#Define('perl', {
 \   'name': 'perl',
-\   'executable': 'perl',
+\   'executable_callback': 'ale_linters#perl#perl#GetExecutable',
 \   'output_stream': 'both',
-\   'command': 'perl -X -c -Mwarnings -Ilib',
+\   'command_callback': 'ale_linters#perl#perl#GetCommand',
 \   'callback': 'ale_linters#perl#perl#Handle',
 \})

doc/ale.txt

@@ -41,6 +41,8 @@ CONTENTS                                                         *ale-contents*
     4.29. xo..............................|ale-linter-options-xo|
     4.30. javac...........................|ale-linter-options-javac|
     4.31. yamllint........................|ale-linter-options-yamllint|
+    4.32. cmakelint.......................|ale-linter-options-cmakelint|
+    4.33. perl-perl.......................|ale-linter-options-perl-perl|
   5. Linter Integration Notes.............|ale-linter-integration|
     5.1.  merlin..........................|ale-linter-integration-ocaml-merlin|
     5.2. rust.............................|ale-integration-rust|
@@ -1097,6 +1099,24 @@ g:ale_cmake_cmakelint_options                   *g:ale_cmake_cmakelint_options*
 
   This variable can be set to pass additional options to cmakelint.
 
+-------------------------------------------------------------------------------
+4.33. perl-perl                                  *ale-linter-options-perl-perl*
+
+g:ale_perl_perl_executable                         *g:ale_perl_perl_executable*
+
+  Type: |String|
+  Default: `'perl'`
+
+  This variable can be changed to modify the executable used for linting perl.
+
+
+g:ale_perl_perl_options                               *g:ale_perl_perl_options*
+
+  Type: |String|
+  Default: `'-X -c -Mwarnings -Ilib'`
+
+  This variable can be changed to alter the command-line arguments to the perl
+  invocation.
 
 ===============================================================================
 5. Linter Integration Notes                            *ale-linter-integration*