#149 - Support Info, style error, and style warning types for problems for signs

autoload/ale.vim

@@ -124,6 +124,17 @@ function! ale#Var(buffer, variable_name) abort
     return getbufvar(str2nr(a:buffer), l:full_name, g:[l:full_name])
 endfunction
 
+" Initialize a variable with a default value, if it isn't already set.
+"
+" 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
+endfunction
+
 " Escape a string suitably for each platform.
 " shellescape does not work on Windows.
 function! ale#Escape(str) abort