Reduce use of VimL (#168)

* perf(context): reduce use of `cmd` and `fn`

* perf(float): reduce use of `cmd` and `fn`

* perf(init): reduce use of `cmd` and `fn`

* perf(menu): reduce use of `cmd` and `fn`

* perf(plugin): reduce use of `cmd` and `fn`

* docs(README): reduce use of `cmd` and `fn`

lua/cmp/context.lua

@@ -55,8 +55,9 @@ context.new = function(prev_context, option)
   self.cursor_line = vim.api.nvim_get_current_line()
   self.virtcol = vim.fn.virtcol('.')
   self.cursor = {}
-  self.cursor.row = vim.api.nvim_win_get_cursor(0)[1]
-  self.cursor.col = vim.api.nvim_win_get_cursor(0)[2] + 1
+  local cursor = vim.api.nvim_win_get_cursor(0)
+  self.cursor.row = cursor[1]
+  self.cursor.col = cursor[2] + 1
   self.cursor.line = self.cursor.row - 1
   self.cursor.character = misc.to_utfindex(self.cursor_line, self.cursor.col)
   self.cursor_before_line = string.sub(self.cursor_line, 1, self.cursor.col - 1)

lua/cmp/float.lua

@@ -125,7 +125,7 @@ float.scroll = function(self, delta)
 
     vim.defer_fn(function()
       vim.api.nvim_buf_call(buf, function()
-        vim.cmd('normal! ' .. top .. 'zt')
+        vim.api.nvim_command('normal! ' .. top .. 'zt')
       end)
     end, 0)
   end

lua/cmp/init.lua

@@ -63,7 +63,7 @@ end
 ---Select next item if possible
 cmp.select_next_item = function()
   if vim.fn.pumvisible() == 1 then
-    vim.fn.feedkeys(keymap.t('<C-n>'), 'n')
+    vim.api.nvim_feedkeys(keymap.t('<C-n>'), 'n', true)
     return true
   else
     return false
@@ -73,7 +73,7 @@ end
 ---Select prev item if possible
 cmp.select_prev_item = function()
   if vim.fn.pumvisible() == 1 then
-    vim.fn.feedkeys(keymap.t('<C-p>'), 'n')
+    vim.api.nvim_feedkeys(keymap.t('<C-p>'), 'n', true)
     return true
   else
     return false

lua/cmp/menu.lua

@@ -48,7 +48,8 @@ menu.close = function(self)
     debug.log('menu.close', vim.fn.pumvisible())
     if vim.fn.pumvisible() == 1 then
       -- TODO: Is it safe to call...?
-      vim.fn.complete(#vim.fn.getline('.') + 1, {})
+      local line = vim.api.nvim_win_get_cursor(0)[1]
+      vim.fn.complete(#vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1] + 1, {})
     end
     self:unselect()
   end)
@@ -162,15 +163,15 @@ menu.show = function(self)
 
   local completeopt = vim.o.completeopt
   if self.preselect == 1 then
-    vim.cmd('set completeopt=menuone,noinsert')
+    vim.opt.completeopt = {'menuone', 'noinsert'}
   else
-    vim.cmd('set completeopt=' .. config.get().completion.completeopt)
+    vim.opt.completeopt = config.get().completion.completeopt
   end
   vim.fn.complete(self.offset, self.items)
   if self.preselect > 1 then
     vim.api.nvim_select_popupmenu_item(self.preselect - 1, false, false, {})
   end
-  vim.cmd('set completeopt=' .. completeopt)
+  vim.opt.completeopt = completeopt
 end
 
 ---Select current item