Include most linter variables in ALEInfo

autoload/ale/debugging.vim

@@ -0,0 +1,59 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: This file implements debugging information for ALE
+
+function! s:GetLinterVariables(filetype, linter_names) abort
+    let l:variable_list = []
+    let l:filetype_parts = split(a:filetype, '\.')
+
+    for l:key in keys(g:)
+        " Extract variable names like: 'ale_python_flake8_executable'
+        let l:match = matchlist(l:key, '\v^ale_([^_]+)_([^_]+)_.+$')
+
+        " Include matching variables.
+        if !empty(l:match)
+        \&& index(l:filetype_parts, l:match[1]) >= 0
+        \&& index(a:linter_names, l:match[2]) >= 0
+            call add(l:variable_list, l:key)
+        endif
+    endfor
+
+    call sort(l:variable_list)
+
+    return l:variable_list
+endfunction
+
+function! s:EchoLinterVariables(variable_list) abort
+    for l:key in a:variable_list
+        echom 'let g:' . l:key . ' = ' . string(g:[l:key])
+    endfor
+endfunction
+
+function! ale#debugging#Info() abort
+    let l:filetype = &filetype
+
+    " We get the list of enabled linters for free by the above function.
+    let l:enabled_linters = deepcopy(ale#linter#Get(l:filetype))
+
+    " But have to build the list of available linters ourselves.
+    let l:all_linters = []
+    let l:linter_variable_list = []
+
+    for l:part in split(l:filetype, '\.')
+        let l:aliased_filetype = ale#linter#ResolveFiletype(l:part)
+        call extend(l:all_linters, ale#linter#GetAll(l:aliased_filetype))
+    endfor
+
+    let l:all_names = map(l:all_linters, 'v:val[''name'']')
+    let l:enabled_names = map(l:enabled_linters, 'v:val[''name'']')
+
+    " Load linter variables to display
+    " This must be done after linters are loaded.
+    let l:variable_list = s:GetLinterVariables(l:filetype, l:enabled_names)
+
+    echom ' Current Filetype: ' . l:filetype
+    echom 'Available Linters: ' . string(l:all_names)
+    echom '  Enabled Linters: ' . string(l:enabled_names)
+    echom ' Linter Variables:'
+    echom ''
+    call s:EchoLinterVariables(l:variable_list)
+endfunction