I broke up with neovim....vim is my best friend now

dot_vim/plugged/ale/ale_linters/elixir/credo.vim

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+" Author: hauleth - https://github.com/hauleth
+
+function! ale_linters#elixir#credo#Handle(buffer, lines) abort
+    " Matches patterns line the following:
+    "
+    " lib/filename.ex:19:7: F: Pipe chain should start with a raw value.
+    let l:pattern = '\v:(\d+):?(\d+)?: (.): (.+)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        let l:type = l:match[3]
+        let l:text = l:match[4]
+
+        " Refactoring opportunities
+        if l:type is# 'F'
+            let l:type = 'W'
+        " Consistency
+        elseif l:type is# 'C'
+            let l:type = 'W'
+        " Software Design
+        elseif l:type is# 'D'
+            let l:type = 'I'
+        " Code Readability
+        elseif l:type is# 'R'
+            let l:type = 'I'
+        endif
+
+        call add(l:output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:match[1] + 0,
+        \   'col': l:match[2] + 0,
+        \   'type': l:type,
+        \   'text': l:text,
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+function! ale_linters#elixir#credo#GetMode() abort
+    if get(g:, 'ale_elixir_credo_strict', 0)
+        return '--strict'
+    else
+        return 'suggest'
+    endif
+endfunction
+
+function! ale_linters#elixir#credo#GetConfigFile() abort
+    let l:config_file = get(g:, 'ale_elixir_credo_config_file', '')
+
+    if empty(l:config_file)
+        return ''
+    endif
+
+    return ' --config-file ' . l:config_file
+endfunction
+
+function! ale_linters#elixir#credo#GetCommand(buffer) abort
+    return 'mix help credo && '
+    \ . 'mix credo ' . ale_linters#elixir#credo#GetMode()
+    \ . ale_linters#elixir#credo#GetConfigFile()
+    \ . ' --format=flycheck --read-from-stdin %s'
+endfunction
+
+call ale#linter#Define('elixir', {
+\   'name': 'credo',
+\   'executable': 'mix',
+\   'cwd': function('ale#handlers#elixir#FindMixUmbrellaRoot'),
+\   'command': function('ale_linters#elixir#credo#GetCommand'),
+\   'callback': 'ale_linters#elixir#credo#Handle',
+\})