split python checker out into 3 files

previously there were 3 checkers in the one file

syntax_checkers/python.vim

@@ -6,75 +6,22 @@
 "             kstep <me@kstep.me>
 "             Parantapa Bhattacharya <parantapa@gmail.com>
 "
-"============================================================================
 "
 " For forcing the use of flake8, pyflakes, or pylint set
 "
 "   let g:syntastic_python_checker = 'pyflakes'
 "
 " in your .vimrc. Default is flake8.
+"============================================================================
 
 if exists("loaded_python_syntax_checker")
     finish
 endif
 let loaded_python_syntax_checker = 1
 
-"bail if the user doesnt have his favorite checker or flake8 or pyflakes installed
-if !exists('g:syntastic_python_checker') || !executable(g:syntastic_python_checker)
-    if executable("flake8")
-        let g:syntastic_python_checker = 'flake8'
-    elseif executable("pyflakes")
-        let g:syntastic_python_checker = 'pyflakes'
-    elseif executable("pylint")
-        let g:syntastic_python_checker = 'pylint'
-    else
-        finish
-    endif
-endif
 if !exists('g:syntastic_python_checker_args')
     let g:syntastic_python_checker_args = ''
 endif
 
-function! SyntaxCheckers_python_Term(i)
-    if a:i['type'] ==# 'E'
-        let a:i['text'] = "Syntax error"
-    endif
-    if match(a:i['text'], 'is assigned to but never used') > -1
-                \ || match(a:i['text'], 'imported but unused') > -1
-                \ || match(a:i['text'], 'undefined name') > -1
-                \ || match(a:i['text'], 'redefinition of') > -1
-                \ || match(a:i['text'], 'referenced before assignment') > -1
-                \ || match(a:i['text'], 'duplicate argument') > -1
-                \ || match(a:i['text'], 'after other statements') > -1
-                \ || match(a:i['text'], 'shadowed by loop variable') > -1
-
-        let term = split(a:i['text'], "'", 1)[1]
-        return '\V\<'.term.'\>'
-    endif
-    return ''
-endfunction
-
-if g:syntastic_python_checker == 'pylint'
-    function! SyntaxCheckers_python_GetLocList()
-        let makeprg = 'pylint -f parseable -r n -i y ' .
-            \ shellescape(expand('%')) .
-            \ ' \| sed ''s_: \[[RC]_: \[W_''' .
-            \ ' \| sed ''s_: \[[F]_:\ \[E_'''
-        let errorformat = '%f:%l: [%t%n] %m,%-GNo config%m'
-        let errors = SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat })
-
-        return errors
-    endfunction
-else
-    function! SyntaxCheckers_python_GetLocList()
-        let makeprg = g:syntastic_python_checker.' '.g:syntastic_python_checker_args.' '.shellescape(expand('%'))
-        let errorformat =
-            \ '%E%f:%l: could not compile,%-Z%p^,%W%f:%l:%c: %m,%W%f:%l: %m,%-G%.%#'
-
-        let errors = SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat })
-
-        call SyntasticHighlightErrors(errors, function('SyntaxCheckers_python_Term'))
-
-        return errors
-    endfunction
-endif
+let s:supported_checkers = ["flake8", "pyflakes", "pylint"]
+call SyntasticLoadChecker(s:supported_checkers)

syntax_checkers/python/flake8.vim

@@ -0,0 +1,36 @@
+"============================================================================
+"File:        flake8.vim
+"Description: Syntax checking plugin for syntastic.vim
+"Authors:     Sylvain Soliman <Sylvain dot Soliman+git at gmail dot com>
+"             kstep <me@kstep.me>
+"
+"============================================================================
+function! SyntaxCheckers_python_Term(i)
+    if a:i['type'] ==# 'E'
+        let a:i['text'] = "Syntax error"
+    endif
+    if match(a:i['text'], 'is assigned to but never used') > -1
+                \ || match(a:i['text'], 'imported but unused') > -1
+                \ || match(a:i['text'], 'undefined name') > -1
+                \ || match(a:i['text'], 'redefinition of') > -1
+                \ || match(a:i['text'], 'referenced before assignment') > -1
+                \ || match(a:i['text'], 'duplicate argument') > -1
+                \ || match(a:i['text'], 'after other statements') > -1
+                \ || match(a:i['text'], 'shadowed by loop variable') > -1
+
+        let term = split(a:i['text'], "'", 1)[1]
+        return '\V\<'.term.'\>'
+    endif
+    return ''
+endfunction
+
+function! SyntaxCheckers_python_GetLocList()
+    let makeprg = 'flake8 '.g:syntastic_python_checker_args.' '.shellescape(expand('%'))
+    let errorformat = '%E%f:%l: could not compile,%-Z%p^,%W%f:%l:%c: %m,%W%f:%l: %m,%-G%.%#'
+
+    let errors = SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat })
+
+    call SyntasticHighlightErrors(errors, function('SyntaxCheckers_python_Term'))
+
+    return errors
+endfunction

syntax_checkers/python/pyflakes.vim

@@ -0,0 +1,37 @@
+"============================================================================
+"File:        pyflakes.vim
+"Description: Syntax checking plugin for syntastic.vim
+"Authors:     Martin Grenfell <martin.grenfell@gmail.com>
+"             kstep <me@kstep.me>
+"             Parantapa Bhattacharya <parantapa@gmail.com>
+"
+"============================================================================
+function! SyntaxCheckers_python_Term(i)
+    if a:i['type'] ==# 'E'
+        let a:i['text'] = "Syntax error"
+    endif
+    if match(a:i['text'], 'is assigned to but never used') > -1
+                \ || match(a:i['text'], 'imported but unused') > -1
+                \ || match(a:i['text'], 'undefined name') > -1
+                \ || match(a:i['text'], 'redefinition of') > -1
+                \ || match(a:i['text'], 'referenced before assignment') > -1
+                \ || match(a:i['text'], 'duplicate argument') > -1
+                \ || match(a:i['text'], 'after other statements') > -1
+                \ || match(a:i['text'], 'shadowed by loop variable') > -1
+
+        let term = split(a:i['text'], "'", 1)[1]
+        return '\V\<'.term.'\>'
+    endif
+    return ''
+endfunction
+
+function! SyntaxCheckers_python_GetLocList()
+    let makeprg = g:syntastic_python_checker.' '.g:syntastic_python_checker_args.' '.shellescape(expand('%'))
+    let errorformat = '%E%f:%l: could not compile,%-Z%p^,%W%f:%l:%c: %m,%W%f:%l: %m,%-G%.%#'
+
+    let errors = SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat })
+
+    call SyntasticHighlightErrors(errors, function('SyntaxCheckers_python_Term'))
+
+    return errors
+endfunction

syntax_checkers/python/pylint.vim

@@ -0,0 +1,14 @@
+"============================================================================
+"File:        pylint.vim
+"Description: Syntax checking plugin for syntastic.vim
+"Author:      Parantapa Bhattacharya <parantapa at gmail dot com>
+"
+"============================================================================
+function! SyntaxCheckers_python_GetLocList()
+    let makeprg = 'pylint -f parseable -r n -i y ' .
+                \ shellescape(expand('%')) .
+                \ ' \| sed ''s_: \[[RC]_: \[W_''' .
+                \ ' \| sed ''s_: \[[F]_:\ \[E_'''
+    let errorformat = '%f:%l: [%t%n] %m,%-GNo config%m'
+    return SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat })
+endfunction