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

dot_vim/plugged/ale/ale_linters/rust/rls.vim

@@ -0,0 +1,27 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: A language server for Rust
+
+call ale#Set('rust_rls_executable', 'rls')
+call ale#Set('rust_rls_toolchain', '')
+call ale#Set('rust_rls_config', {})
+
+function! ale_linters#rust#rls#GetCommand(buffer) abort
+    let l:toolchain = ale#Var(a:buffer, 'rust_rls_toolchain')
+
+    return '%e' . (!empty(l:toolchain) ? ' +' . ale#Escape(l:toolchain) : '')
+endfunction
+
+function! ale_linters#rust#rls#GetProjectRoot(buffer) abort
+    let l:cargo_file = ale#path#FindNearestFile(a:buffer, 'Cargo.toml')
+
+    return !empty(l:cargo_file) ? fnamemodify(l:cargo_file, ':h') : ''
+endfunction
+
+call ale#linter#Define('rust', {
+\   'name': 'rls',
+\   'lsp': 'stdio',
+\   'lsp_config': {b -> ale#Var(b, 'rust_rls_config')},
+\   'executable': {b -> ale#Var(b, 'rust_rls_executable')},
+\   'command': function('ale_linters#rust#rls#GetCommand'),
+\   'project_root': function('ale_linters#rust#rls#GetProjectRoot'),
+\})