fix lint issues and enable linting for autoload folder (#224)

.travis.yml

@@ -28,4 +28,4 @@ before_script:
     - vim --version
 
 script:
-    - vint plugin ftplugin
+    - vint autoload ftplugin plugin

autoload/lsp.vim

@@ -65,22 +65,22 @@ endfunction
 
 function! s:server_status(server_name) abort
     if !has_key(s:servers, a:server_name)
-        return "unknown server"
+        return 'unknown server'
     endif
     let l:server = s:servers[a:server_name]
     if has_key(l:server, 'exited')
-        return "exited"
+        return 'exited'
     endif
     if has_key(l:server, 'init_callbacks')
-        return "starting"
+        return 'starting'
     endif
     if has_key(l:server, 'failed')
-        return "failed"
+        return 'failed'
     endif
     if has_key(l:server, 'init_result')
-        return "running"
+        return 'running'
     endif
-    return "not running"
+    return 'not running'
 endfunction
 
 " Returns the current status of all servers (if called with no arguments) or

autoload/lsp/omni.vim

@@ -162,10 +162,10 @@ function! lsp#omni#get_vim_completion_item(item) abort
         let l:abbr = a:item['label']
     endif
     let l:menu = lsp#omni#get_kind_text(a:item)
-    let l:completion = { 'word': l:word, 'abbr': l:abbr, 'menu': l:menu, 'info': "", 'icase': 1, 'dup': 1 }
+    let l:completion = { 'word': l:word, 'abbr': l:abbr, 'menu': l:menu, 'info': '', 'icase': 1, 'dup': 1 }
 
     if has_key(a:item, 'detail') 
-      let l:completion['info'] .= a:item['detail'] . " "
+      let l:completion['info'] .= a:item['detail'] . ' '
     endif 
 
     if has_key(a:item, 'documentation')

autoload/lsp/ui/vim/diagnostics/echo.vim

@@ -1,4 +1,4 @@
-function! lsp#ui#vim#diagnostics#echo#cursor_moved()
+function! lsp#ui#vim#diagnostics#echo#cursor_moved() abort
     if !g:lsp_diagnostics_echo_cursor
         return
     endif

autoload/lsp/ui/vim/output.vim

@@ -44,6 +44,6 @@ function! s:append(data) abort
     elseif type(a:data) == type({}) && has_key(a:data, 'kind')
         silent put =a:data.value
 
-        return a:data.kind == 'plaintext' ? 'text' : a:data.kind
+        return a:data.kind ==? 'plaintext' ? 'text' : a:data.kind
     endif
 endfunction

autoload/lsp/ui/vim/signs.vim

@@ -56,7 +56,7 @@ function! lsp#ui#vim#signs#next_error() abort
 	let l:view.lnum = l:next_line
 	let l:view.topline = 1
 	let l:height = winheight(0)
-	let totalnum = line("$")
+	let totalnum = line('$')
 	if totalnum > l:height
 		let l:half = l:height / 2
 		if l:totalnum - l:half < l:view.lnum
@@ -91,7 +91,7 @@ function! lsp#ui#vim#signs#previous_error() abort
 	let l:view.lnum = l:next_line
 	let l:view.topline = 1
 	let l:height = winheight(0)
-	let totalnum = line("$")
+	let totalnum = line('$')
 	if totalnum > l:height
 		let l:half = l:height / 2
 		if l:totalnum - l:half < l:view.lnum
@@ -178,7 +178,7 @@ function! s:clear_signs(server_name, path) abort
     endif
 
     for l:id in s:signs[a:server_name][a:path]
-        execute ":sign unplace " . l:id . " file=" . a:path
+        execute ':sign unplace ' . l:id . ' file=' . a:path
     endfor
 
     let s:signs[a:server_name][a:path] = []
@@ -194,12 +194,12 @@ function! s:place_signs(server_name, path, diagnostics) abort
             let l:name = 'LspError'
             if has_key(l:item, 'severity') && !empty(l:item['severity'])
                 let l:name = get(s:severity_sign_names_mapping, l:item['severity'], 'LspError')
-                execute ":sign place " . g:lsp_next_sign_id . " name=" . l:name . " line=" . l:line . " file=" . a:path
+                execute ':sign place ' . g:lsp_next_sign_id . ' name=' . l:name . ' line=' . l:line . ' file=' . a:path
                 call add(s:signs[a:server_name][a:path], g:lsp_next_sign_id)
                 call lsp#log('add signs')
                 let g:lsp_next_sign_id += 1
 
-				if l:name == 'LspError'
+				if l:name ==? 'LspError'
 					call add(s:err_loc, l:line)
 				endif
 				let s:err_loc = sort(s:err_loc)