fixup: fix padding, fmt options in tabs and buffers

Previously these options were applied to entire tabs/buffers components.
Now they are applied to specific buffer/tab.

Note: Now icon, color options are no longer applicable to buffers & tabs
component. I can't see how they make sense here. Also cond stil applies
to entire component.

fixes #414

lua/lualine/components/buffers/buffer.lua

@@ -47,19 +47,23 @@ end
 ---returns rendered buffer
 ---@return string
 function Buffer:render()
-  local name
+  local name = self:name()
+  if self.options.fmt then
+    name = self.options.fmt(name or '')
+  end
 
   if self.ellipse then -- show elipsis
     name = '...'
   else
     if self.options.mode == 0 then
-      name = string.format(' %s%s%s ', self.icon, self:name(), self.modified_icon)
+      name = string.format('%s%s%s', self.icon, name, self.modified_icon)
     elseif self.options.mode == 1 then
       name = string.format('%s %s%s', self.bufnr, self.icon, self.modified_icon)
     else
-      name = string.format(' %s %s%s%s ', self.bufnr, self.icon, self:name(), self.modified_icon)
+      name = string.format('%s %s%s%s', self.bufnr, self.icon, name, self.modified_icon)
     end
   end
+  name = Buffer.apply_padding(name, self.options.padding)
   self.len = vim.fn.strchars(name)
 
   -- setup for mouse clicks
@@ -119,4 +123,15 @@ function Buffer:name()
     or vim.fn.pathshorten(vim.fn.fnamemodify(self.file, ':p:.'))
 end
 
+---adds spaces to left and right
+function Buffer.apply_padding(str, padding)
+  local l_padding, r_padding = 1, 1
+  if type(padding) == 'number' then
+    l_padding, r_padding = padding, padding
+  elseif type(padding) == 'table' then
+    l_padding, r_padding = padding.left or 0, padding.right or 0
+  end
+  return string.rep(' ', l_padding) .. str .. string.rep(' ', r_padding)
+end
+
 return Buffer

lua/lualine/components/buffers/init.lua

@@ -177,6 +177,22 @@ function M:update_status()
   return table.concat(data)
 end
 
+function M:draw()
+  self.status = ''
+  self.applied_separator = ''
+
+  if self.options.cond ~= nil and self.options.cond() ~= true then
+    return self.status
+  end
+  local status = self:update_status()
+  if type(status) == 'string' and #status > 0 then
+    self.status = status
+    self:apply_section_separators()
+    self:apply_separator()
+  end
+  return self.status
+end
+
 vim.cmd [[
   function! LualineSwitchBuffer(bufnr, mouseclicks, mousebutton, modifiers)
     execute ":buffer " . a:bufnr

lua/lualine/components/tabs/init.lua

@@ -147,6 +147,22 @@ function M:update_status()
   return table.concat(data)
 end
 
+function M:draw()
+  self.status = ''
+  self.applied_separator = ''
+
+  if self.options.cond ~= nil and self.options.cond() ~= true then
+    return self.status
+  end
+  local status = self:update_status()
+  if type(status) == 'string' and #status > 0 then
+    self.status = status
+    self:apply_section_separators()
+    self:apply_separator()
+  end
+  return self.status
+end
+
 vim.cmd [[
   function! LualineSwitchTab(tabnr, mouseclicks, mousebutton, modifiers)
     execute a:tabnr . "tabnext"

lua/lualine/components/tabs/tab.lua

@@ -35,19 +35,23 @@ end
 ---returns rendered tab
 ---@return string
 function Tab:render()
-  local name
+  local name = self:label()
+  if self.options.fmt then
+    name = self.options.fmt(name or '')
+  end
   if self.ellipse then -- show elipsis
     name = '...'
   else
     -- different formats for different modes
     if self.options.mode == 0 then
-      name = string.format('%s%s ', (self.last or not self.first) and ' ' or '', tostring(self.tabnr))
+      name = tostring(self.tabnr)
     elseif self.options.mode == 1 then
-      name = string.format('%s%s ', (self.last or not self.first) and ' ' or '', self:label())
+      name = name
     else
-      name = string.format('%s%s %s ', (self.last or not self.first) and ' ' or '', tostring(self.tabnr), self:label())
+      name = string.format('%s %s', tostring(self.tabnr), name)
     end
   end
+  name = Tab.apply_padding(name, self.options.padding)
   self.len = vim.fn.strchars(name)
 
   -- setup for mouse clicks
@@ -88,4 +92,15 @@ function Tab:separator_after()
   end
 end
 
+---adds spaces to left and right
+function Tab.apply_padding(str, padding)
+  local l_padding, r_padding = 1, 1
+  if type(padding) == 'number' then
+    l_padding, r_padding = padding, padding
+  elseif type(padding) == 'table' then
+    l_padding, r_padding = padding.left or 0, padding.right or 0
+  end
+  return string.rep(' ', l_padding) .. str .. string.rep(' ', r_padding)
+end
+
 return Tab