Updated plugins

sources_non_forked/ale/autoload/ale.vim

@@ -191,15 +191,12 @@ endfunction
 "
 " Every variable name will be prefixed with 'ale_'.
 function! ale#Var(buffer, variable_name) abort
-    let l:nr = str2nr(a:buffer)
     let l:full_name = 'ale_' . a:variable_name
+    let l:vars = getbufvar(str2nr(a:buffer), '', 0)
 
-    if bufexists(l:nr)
-        let l:vars = getbufvar(l:nr, '')
-    elseif has_key(g:, 'ale_fix_buffer_data')
-        let l:vars = get(g:ale_fix_buffer_data, l:nr, {'vars': {}}).vars
-    else
-        let l:vars = {}
+    if l:vars is 0
+        " Look for variables from deleted buffers, saved from :ALEFix
+        let l:vars = get(get(g:ale_fix_buffer_data, a:buffer, {}), 'vars', {})
     endif
 
     return get(l:vars, l:full_name, g:[l:full_name])
@@ -210,10 +207,29 @@ endfunction
 " Every variable name will be prefixed with 'ale_'.
 function! ale#Set(variable_name, default) abort
     let l:full_name = 'ale_' . a:variable_name
-    let l:value = get(g:, l:full_name, a:default)
-    let g:[l:full_name] = l:value
 
-    return l:value
+    if !has_key(g:, l:full_name)
+        let g:[l:full_name] = a:default
+    endif
+endfunction
+
+" Given a string for adding to a command, return the string padded with a
+" space on the left if it is not empty. Otherwise return an empty string.
+"
+" This can be used for making command strings cleaner and easier to test.
+function! ale#Pad(string) abort
+    return !empty(a:string) ? ' ' . a:string : ''
+endfunction
+
+" Given a environment variable name and a value, produce part of a command for
+" setting an environment variable before running a command. The syntax will be
+" valid for cmd on Windows, or most shells on Unix.
+function! ale#Env(variable_name, value) abort
+    if has('win32')
+        return 'set ' . a:variable_name . '=' . ale#Escape(a:value) . ' && '
+    endif
+
+    return a:variable_name . '=' . ale#Escape(a:value) . ' '
 endfunction
 
 " Escape a string suitably for each platform.