diff --git a/lib/awful/widget/button.lua b/lib/awful/widget/button.lua
index 25f2da64..8189bfc3 100644
--- a/lib/awful/widget/button.lua
+++ b/lib/awful/widget/button.lua
@@ -6,13 +6,11 @@
 ---------------------------------------------------------------------------
 
 local setmetatable = setmetatable
-local type = type
 local abutton = require("awful.button")
 local imagebox = require("wibox.widget.imagebox")
 local widget = require("wibox.widget.base")
 local surface = require("gears.surface")
 local cairo = require("lgi").cairo
-local capi = { mouse = mouse }
 
 local button = { mt = {} }
 
@@ -31,13 +29,13 @@ function button.new(args)
     local img_release
     local img_press
 
-    w.set_image = function(w, image)
+    function w:set_image(image)
         img_release = surface.load(image)
         img_press = img_release:create_similar(cairo.Content.COLOR_ALPHA, img_release.width, img_release.height)
         local cr = cairo.Context(img_press)
         cr:set_source_surface(img_release, 2, 2)
         cr:paint()
-        orig_set_image(w, img_release)
+        orig_set_image(self, img_release)
     end
     w:set_image(args.image)
     w:buttons(abutton({}, 1, function () orig_set_image(w, img_press) end, function () orig_set_image(w, img_release) end))
diff --git a/lib/awful/widget/common.lua b/lib/awful/widget/common.lua
index ebab6337..ba9999c8 100644
--- a/lib/awful/widget/common.lua
+++ b/lib/awful/widget/common.lua
@@ -6,17 +6,10 @@
 ---------------------------------------------------------------------------
 
 -- Grab environment we need
-local math = math
 local type = type
 local ipairs = ipairs
-local pairs = pairs
-local pcall = pcall
-local setmetatable = setmetatable
 local capi = { button = button }
-local util = require("awful.util")
 local wibox = require("wibox")
-local imagebox = require("wibox.widget.imagebox")
-local textbox = require("wibox.widget.textbox")
 local dpi = require("beautiful").xresources.apply_dpi
 
 --- Common utilities for awful widgets
@@ -29,7 +22,7 @@ local common = {}
 function common.create_buttons(buttons, object)
     if buttons then
         local btns = {}
-        for kb, b in ipairs(buttons) do
+        for _, b in ipairs(buttons) do
             -- Create a proxy button object: it will receive the real
             -- press and release events, and will propagate them the the
             -- button object the user provided, but with the object as
diff --git a/lib/awful/widget/graph.lua b/lib/awful/widget/graph.lua
index fdd83198..73d14cea 100644
--- a/lib/awful/widget/graph.lua
+++ b/lib/awful/widget/graph.lua
@@ -69,7 +69,7 @@ local properties = { "width", "height", "border_color", "stack",
                      "stack_colors", "color", "background_color",
                      "max_value", "scale" }
 
-function graph.draw(_graph, context, cr, width, height)
+function graph.draw(_graph, _, cr, width, height)
     local max_value = data[_graph].max_value
     local values = data[_graph].values
 
@@ -91,7 +91,7 @@ function graph.draw(_graph, context, cr, width, height)
 
         if data[_graph].scale then
             for _, v in ipairs(values) do
-                for __, sv in ipairs(v) do
+                for _, sv in ipairs(v) do
                     if sv > max_value then
                         max_value = sv
                     end
@@ -169,7 +169,7 @@ end
 local function add_value(_graph, value, group)
     if not _graph then return end
 
-    local value = value or 0
+    value = value or 0
     local values = data[_graph].values
     local max_value = data[_graph].max_value
     value = math.max(0, value)
@@ -243,7 +243,7 @@ end
 -- key to set graph geometry.
 -- @return A graph widget.
 function graph.new(args)
-    local args = args or {}
+    args = args or {}
 
     local width = args.width or 100
     local height = args.height or 20
diff --git a/lib/awful/widget/keyboardlayout.lua b/lib/awful/widget/keyboardlayout.lua
index 2c58f9c6..b3b83762 100644
--- a/lib/awful/widget/keyboardlayout.lua
+++ b/lib/awful/widget/keyboardlayout.lua
@@ -7,7 +7,6 @@
 
 local capi = {awesome = awesome}
 local setmetatable = setmetatable
-local os = os
 local textbox = require("wibox.widget.textbox")
 local button = require("awful.button")
 local util = require("awful.util")
@@ -264,8 +263,7 @@ function keyboardlayout.new()
     update_layout(self);
 
     self.next_layout = function()
-        new_layout = (self._current + 1) % (#self._layout + 1)
-        self.set_layout(new_layout)
+        self.set_layout((self._current + 1) % (#self._layout + 1))
     end
 
     self.set_layout = function(group_number)
diff --git a/lib/awful/widget/layoutbox.lua b/lib/awful/widget/layoutbox.lua
index 2434ab77..11e7fcaf 100644
--- a/lib/awful/widget/layoutbox.lua
+++ b/lib/awful/widget/layoutbox.lua
@@ -8,8 +8,6 @@
 ---------------------------------------------------------------------------
 
 local setmetatable = setmetatable
-local ipairs = ipairs
-local button = require("awful.button")
 local layout = require("awful.layout")
 local tooltip = require("awful.tooltip")
 local tag = require("awful.tag")
@@ -21,9 +19,9 @@ local layoutbox = { mt = {} }
 local boxes = nil
 
 local function update(w, screen)
-    local layout = layout.getname(layout.get(screen))
-    w._layoutbox_tooltip:set_text(layout or "[no name]")
-    w:set_image(layout and beautiful["layout_" .. layout])
+    local name = layout.getname(layout.get(screen))
+    w._layoutbox_tooltip:set_text(name or "[no name]")
+    w:set_image(name and beautiful["layout_" .. name])
 end
 
 local function update_from_tag(t)
@@ -39,7 +37,7 @@ end
 -- @param screen The screen number that the layout will be represented for.
 -- @return An imagebox widget configured as a layoutbox.
 function layoutbox.new(screen)
-    local screen = screen or 1
+    screen = screen or 1
 
     -- Do we already have the update callbacks registered?
     if boxes == nil then
diff --git a/lib/awful/widget/progressbar.lua b/lib/awful/widget/progressbar.lua
index 4932207b..4eb5ccbf 100644
--- a/lib/awful/widget/progressbar.lua
+++ b/lib/awful/widget/progressbar.lua
@@ -71,7 +71,7 @@ local properties = { "width", "height", "border_color",
                      "vertical", "value", "max_value",
                      "ticks", "ticks_gap", "ticks_size" }
 
-function progressbar.draw(pbar, context, cr, width, height)
+function progressbar.draw(pbar, _, cr, width, height)
     local ticks_gap = data[pbar].ticks_gap or 1
     local ticks_size = data[pbar].ticks_size or 4
 
@@ -161,7 +161,7 @@ end
 --- Set the progressbar value.
 -- @param value The progress bar value between 0 and 1.
 function progressbar:set_value(value)
-    local value = value or 0
+    value = value or 0
     local max_value = data[self].max_value
     data[self].value = math.min(max_value, math.max(0, value))
     self:emit_signal("widget::redraw_needed")
@@ -200,7 +200,7 @@ end
 -- key to set progressbar geometry.
 -- @return A progressbar widget.
 function progressbar.new(args)
-    local args = args or {}
+    args = args or {}
     local width = args.width or 100
     local height = args.height or 20
 
diff --git a/lib/awful/widget/prompt.lua b/lib/awful/widget/prompt.lua
index ef4af3d3..e242acac 100644
--- a/lib/awful/widget/prompt.lua
+++ b/lib/awful/widget/prompt.lua
@@ -42,7 +42,7 @@ end
 -- @param args Arguments table. "prompt" is the prompt to use.
 -- @return A launcher widget.
 function widgetprompt.new(args)
-    local args = args or {}
+    args = args or {}
     local widget = textbox()
     local promptbox = widget_base.make_widget(widget)
 
diff --git a/lib/awful/widget/taglist.lua b/lib/awful/widget/taglist.lua
index f632a861..4aeff6e7 100644
--- a/lib/awful/widget/taglist.lua
+++ b/lib/awful/widget/taglist.lua
@@ -11,7 +11,6 @@
 local capi = { screen = screen,
                awesome = awesome,
                client = client }
-local type = type
 local setmetatable = setmetatable
 local pairs = pairs
 local ipairs = ipairs
@@ -53,7 +52,8 @@ function taglist.taglist_label(t, args)
     local fg_color = nil
     local bg_image
     local icon
-    local bg_resize = false
+    -- TODO: Re-implement bg_resize
+    local bg_resize = false -- luacheck: ignore
     local is_selected = false
     local cls = t:clients()
 
@@ -117,7 +117,7 @@ end
 
 local function taglist_update(s, w, buttons, filter, data, style, update_function)
     local tags = {}
-    for k, t in ipairs(tag.gettags(s)) do
+    for _, t in ipairs(tag.gettags(s)) do
         if not tag.getproperty(t, "hide") and filter(t) then
             table.insert(tags, t)
         end
@@ -211,25 +211,21 @@ end
 
 --- Filtering function to include all nonempty tags on the screen.
 -- @param t The tag.
--- @param args unused list of extra arguments.
 -- @return true if t is not empty, else false
-function taglist.filter.noempty(t, args)
+function taglist.filter.noempty(t)
     return #t:clients() > 0 or t.selected
 end
 
 --- Filtering function to include selected tags on the screen.
 -- @param t The tag.
--- @param args unused list of extra arguments.
 -- @return true if t is not empty, else false
-function taglist.filter.selected(t, args)
+function taglist.filter.selected(t)
     return t.selected
 end
 
 --- Filtering function to include all tags on the screen.
--- @param t The tag.
--- @param args unused list of extra arguments.
 -- @return true
-function taglist.filter.all(t, args)
+function taglist.filter.all()
     return true
 end
 
diff --git a/lib/awful/widget/tasklist.lua b/lib/awful/widget/tasklist.lua
index ccae7fa1..5c0294e1 100644
--- a/lib/awful/widget/tasklist.lua
+++ b/lib/awful/widget/tasklist.lua
@@ -48,10 +48,10 @@ local function tasklist_label(c, args, tb)
     local font_focus = args.font_focus or theme.tasklist_font_focus or theme.font_focus or font or ""
     local font_minimized = args.font_minimized or theme.tasklist_font_minimized or theme.font_minimized or font or ""
     local font_urgent = args.font_urgent or theme.tasklist_font_urgent or theme.font_urgent or font or ""
-    local bg = nil
     local text = ""
     local name = ""
-    local bg_image = nil
+    local bg
+    local bg_image
 
     -- symbol to use to indicate certain client properties
     local sticky = args.sticky or theme.tasklist_sticky or "▪"
@@ -89,8 +89,8 @@ local function tasklist_label(c, args, tb)
     -- is considered to be focused, if the real client has skip_taskbar.
     if not focused and capi.client.focus and capi.client.focus.skip_taskbar
         and client.get_transient_for_matching(capi.client.focus,
-                                              function(c)
-                                                  return not c.skip_taskbar
+                                              function(cl)
+                                                  return not cl.skip_taskbar
                                               end) == c then
         focused = true
     end
@@ -120,7 +120,7 @@ end
 
 local function tasklist_update(s, w, buttons, filter, data, style, update_function)
     local clients = {}
-    for k, c in ipairs(capi.client.get()) do
+    for _, c in ipairs(capi.client.get()) do
         if not (c.skip_taskbar or c.hidden
             or c.type == "splash" or c.type == "dock" or c.type == "desktop")
             and filter(c, s) then
@@ -245,10 +245,8 @@ function tasklist.new(screen, filter, buttons, style, update_function, base_widg
 end
 
 --- Filtering function to include all clients.
--- @param c The client.
--- @param screen The screen we are drawing on.
 -- @return true
-function tasklist.filter.allscreen(c, screen)
+function tasklist.filter.allscreen()
     return true
 end
 
@@ -271,7 +269,7 @@ function tasklist.filter.currenttags(c, screen)
     -- Include sticky client too
     if c.sticky then return true end
     local tags = tag.gettags(screen)
-    for k, t in ipairs(tags) do
+    for _, t in ipairs(tags) do
         if t.selected then
             local ctags = c:tags()
             for _, v in ipairs(ctags) do
@@ -296,7 +294,7 @@ function tasklist.filter.minimizedcurrenttags(c, screen)
     -- Include sticky client
     if c.sticky then return true end
     local tags = tag.gettags(screen)
-    for k, t in ipairs(tags) do
+    for _, t in ipairs(tags) do
         -- Select only minimized clients
         if t.selected then
             local ctags = c:tags()
diff --git a/lib/awful/widget/textclock.lua b/lib/awful/widget/textclock.lua
index 6b5d708e..a4a0f90c 100644
--- a/lib/awful/widget/textclock.lua
+++ b/lib/awful/widget/textclock.lua
@@ -27,8 +27,8 @@ end
 -- @param timeout How often update the time. Default is 60.
 -- @return A textbox widget.
 function textclock.new(format, timeout)
-    local format = format or " %a %b %d, %H:%M "
-    local timeout = timeout or 60
+    format = format or " %a %b %d, %H:%M "
+    timeout = timeout or 60
 
     local w = textbox()
     local t