Refactor everything to smaller libs

+ autoload

autoload/util.vim

@@ -0,0 +1,42 @@
+if exists("s:loaded")
+    finish
+endif
+let s:loaded = 1
+
+
+function! util#FirstNonEmpty(lines)
+    for line in a:lines
+        if len(line) > 0
+            return line
+        endif
+    endfor
+endfunction
+
+
+function! util#CheckDependency(command)
+    if !executable(a:command)
+        echoerr "Not found: " . a:command
+        finish
+    endif
+    return exepath(a:command)
+endfunction
+
+
+function! util#JumpToLocation(file, line, col)
+    if expand("%:p") != a:file
+        execute ":e " . a:file
+    endif
+    execute ":" . a:line
+    execute ":norm " . a:col . "|"
+endfunction
+
+
+function! util#JumpFromQuickfix(shouldReturn)
+    let [file, location, _] = split(getline(line(".")), "|")
+    let [l, c] = split(location, " col ")
+    wincmd p
+    call s:JumpToLocation(file, l, c)
+    if a:shouldReturn
+        wincmd p
+    endif
+endfunction