fix some luacheck warnings

.ci/script.sh

@@ -8,4 +8,4 @@ make all
 retry_cmd 2 make testfront
 set +o pipefail
 luajit $(which luacheck) --no-color -q frontend | tee ./luacheck.out
-test $(grep Total ./luacheck.out | awk '{print $2}') -le 53
+test $(grep Total ./luacheck.out | awk '{print $2}') -le 25

frontend/apps/reader/modules/readerpaging.lua

@@ -605,7 +605,7 @@ function ReaderPaging:genPageStatesFromTop(top_page_state, blank_area, offset)
             if self.current_page == self.number_of_pages then break end
             self:_gotoPage(current_page + 1, "scrolling")
             current_page = current_page + 1
-            local state = self:getNextPageState(blank_area, Geom:new{})
+            state = self:getNextPageState(blank_area, Geom:new{})
             table.insert(page_states, state)
         end
     end
@@ -627,7 +627,7 @@ function ReaderPaging:genPageStatesFromBottom(bottom_page_state, blank_area, off
             if self.current_page == 1 then break end
             self:_gotoPage(current_page - 1, "scrolling")
             current_page = current_page - 1
-            local state = self:getPrevPageState(blank_area, Geom:new{})
+            state = self:getPrevPageState(blank_area, Geom:new{})
             table.insert(page_states, 1, state)
         end
     end

frontend/apps/reader/modules/readersearch.lua

@@ -27,9 +27,9 @@ function ReaderSearch:addToMainMenu(tab_item_table)
 end
 
 function ReaderSearch:onShowSearchDialog(text)
-    local do_search = function(search_func, text, param)
+    local do_search = function(search_func, _text, param)
         return function()
-            local res = search_func(self, text, param)
+            local res = search_func(self, _text, param)
             if res then
                 if self.ui.document.info.has_pages then
                     self.ui.link:onGotoLink({page = res.page - 1})

frontend/apps/reader/modules/readerview.lua

@@ -452,7 +452,7 @@ function ReaderView:drawXPointerSavedHighlight(bb, x, y)
     end -- end for all saved highlight
 end
 
-function ReaderView:drawHighlightRect(bb, x, y, rect, drawer)
+function ReaderView:drawHighlightRect(bb, _x, _y, rect, drawer)
     local x, y, w, h = rect.x, rect.y, rect.w, rect.h
 
     if drawer == "underscore" then

frontend/document/koptinterface.lua

@@ -322,12 +322,12 @@ function KoptInterface:renderOptimizedPage(doc, pageno, rect, zoom, rotation, re
     local cached = Cache:check(renderpg_hash, TileCacheItem)
     if not cached then
         local page_size = Document.getNativePageDimensions(doc, pageno)
-        local bbox = {
+        local full_page_bbox = {
             x0 = 0, y0 = 0,
             x1 = page_size.w,
             y1 = page_size.h,
         }
-        local kc = self:createContext(doc, pageno, bbox)
+        local kc = self:createContext(doc, pageno, full_page_bbox)
         local page = doc._document:openPage(pageno)
         kc:setZoom(zoom)
         page:getPagePix(kc)
@@ -444,7 +444,7 @@ function KoptInterface:getReflowedTextBoxes(doc, pageno)
     local cached = Cache:check(hash)
     if not cached then
         local kctx_hash = "kctx|"..context_hash
-        local cached = Cache:check(kctx_hash)
+        cached = Cache:check(kctx_hash)
         if cached then
             local kc = self:waitForContext(cached.kctx)
             --kc:setDebug()
@@ -468,7 +468,7 @@ function KoptInterface:getNativeTextBoxes(doc, pageno)
     local cached = Cache:check(hash)
     if not cached then
         local kctx_hash = "kctx|"..context_hash
-        local cached = Cache:check(kctx_hash)
+        cached = Cache:check(kctx_hash)
         if cached then
             local kc = self:waitForContext(cached.kctx)
             --kc:setDebug()
@@ -493,7 +493,7 @@ function KoptInterface:getReflowedTextBoxesFromScratch(doc, pageno)
     local cached = Cache:check(hash)
     if not cached then
         local kctx_hash = "kctx|"..context_hash
-        local cached = Cache:check(kctx_hash)
+        cached = Cache:check(kctx_hash)
         if cached then
             local reflowed_kc = self:waitForContext(cached.kctx)
             local fullwidth, fullheight = reflowed_kc:getPageDim()
@@ -541,19 +541,19 @@ end
 get page regions in native page via optical method,
 --]]
 function KoptInterface:getPageBlock(doc, pageno, x, y)
-    local kctx = nil
+    local kctx
     local bbox = doc:getPageBBox(pageno)
     local context_hash = self:getContextHash(doc, pageno, bbox)
     local hash = "pageblocks|"..context_hash
     local cached = Cache:check(hash)
     if not cached then
         local page_size = Document.getNativePageDimensions(doc, pageno)
-        local bbox = {
+        local full_page_bbox = {
             x0 = 0, y0 = 0,
             x1 = page_size.w,
             y1 = page_size.h,
         }
-        local kc = self:createContext(doc, pageno, bbox)
+        local kc = self:createContext(doc, pageno, full_page_bbox)
         local screen_size = Screen:getSize()
         -- leptonica needs a source image of at least 300dpi
         kc:setZoom(screen_size.w / page_size.w * 300 / self.screen_dpi)
@@ -594,7 +594,7 @@ function KoptInterface:getReflewOCRWord(doc, pageno, rect)
     local cached = Cache:check(hash)
     if not cached then
         local kctx_hash = "kctx|"..context_hash
-        local cached = Cache:check(kctx_hash)
+        cached = Cache:check(kctx_hash)
         if cached then
             local kc = self:waitForContext(cached.kctx)
             local _, word = pcall(
@@ -665,8 +665,8 @@ function KoptInterface:getClipPageContext(doc, pos0, pos1, pboxes, drawer)
             x = box.x, y = box.y,
             w = box.w, h = box.h,
         }
-        for _, box in ipairs(pboxes) do
+        for _, _box in ipairs(pboxes) do
-            rect = rect:combine(Geom:new(box))
+            rect = rect:combine(Geom:new(_box))
         end
     else
         local zoom = pos0.zoom or 1
@@ -910,9 +910,9 @@ end
 get link from position in screen page
 ]]--
 function KoptInterface:getLinkFromPosition(doc, pageno, pos)
-    local function inside_box(pos, box)
+    local function _inside_box(_pos, box)
-        if pos then
+        if _pos then
-            local x, y = pos.x, pos.y
+            local x, y = _pos.x, _pos.y
             if box.x <= x and box.y <= y
                 and box.x + box.w >= x
                 and box.y + box.h >= y then
@@ -934,7 +934,7 @@ function KoptInterface:getLinkFromPosition(doc, pageno, pos)
                 w = link.x1 - link.x0 + Screen:scaleBySize(10),
                 h = link.y1 - link.y0 + Screen:scaleBySize(10)
             }
-            if inside_box(pos, lbox) and link.page then
+            if _inside_box(pos, lbox) and link.page then
                 return link, lbox
             end
         end

frontend/ui/data/koptoptions.lua

@@ -6,14 +6,6 @@ local function enable_if_equals(configurable, option, value)
     return configurable[option] == value
 end
 
-local function enable_if_greater_than(configurable, option, value)
-    return configurable[option] > value
-end
-
-local function enable_if_less_than(configurable, option, value)
-    return configurable[option] < value
-end
-
 local KoptOptions = {
     prefix = 'kopt',
     {

frontend/ui/elements/screen_disable_double_tap_table.lua

@@ -8,7 +8,7 @@ return {
         return G_reader_settings:readSetting("disable_double_tap") ~= false
     end,
     callback = function()
-        disabled = G_reader_settings:readSetting("disable_double_tap") ~= false
+        local disabled = G_reader_settings:readSetting("disable_double_tap") ~= false
         G_reader_settings:saveSetting("disable_double_tap", not disabled)
         UIManager:show(InfoMessage:new{
             text = _("This will take effect on next restart."),

frontend/ui/elements/screen_dpi_menu_table.lua

@@ -6,13 +6,13 @@ local function dpi() return G_reader_settings:readSetting("screen_dpi") end
 
 local function custom() return G_reader_settings:readSetting("custom_screen_dpi") end
 
-local function setDPI(dpi)
+local function setDPI(_dpi)
     local InfoMessage = require("ui/widget/infomessage")
     local UIManager = require("ui/uimanager")
     UIManager:show(InfoMessage:new{
         text = _("This will take effect on next restart."),
     })
-    Screen:setDPI(dpi)
+    Screen:setDPI(_dpi)
 end
 
 
@@ -29,32 +29,32 @@ return {
         {
             text = _("Small"),
             checked_func = function()
-                local dpi, custom = dpi(), custom()
+                local _dpi, _custom = dpi(), custom()
-                return dpi and dpi <= 140 and dpi ~= custom
+                return _dpi and _dpi <= 140 and _dpi ~= _custom
             end,
             callback = function() setDPI(120) end
         },
         {
             text = _("Medium"),
             checked_func = function()
-                local dpi, custom = dpi(), custom()
+                local _dpi, _custom = dpi(), custom()
-                return dpi and dpi > 140 and dpi <= 200 and dpi ~= custom
+                return _dpi and _dpi > 140 and _dpi <= 200 and _dpi ~= _custom
             end,
             callback = function() setDPI(160) end
         },
         {
             text = _("Large"),
             checked_func = function()
-                local dpi, custom = dpi(), custom()
+                local _dpi, _custom = dpi(), custom()
-                return dpi and dpi > 200 and dpi ~= custom
+                return _dpi and _dpi > 200 and _dpi ~= _custom
             end,
             callback = function() setDPI(240) end
         },
         {
             text = _("Custom DPI") .. ": " .. (custom() or 160),
             checked_func = function()
-                local dpi, custom = dpi(), custom()
+                local _dpi, _custom = dpi(), custom()
-                return custom and dpi == custom
+                return _custom and _dpi == _custom
             end,
             callback = function() setDPI(custom() or 160) end,
             hold_input = {
@@ -62,11 +62,11 @@ return {
                 type = "number",
                 hint = "(90 - 330)",
                 callback = function(input)
-                    local dpi = tonumber(input)
+                    local _dpi = tonumber(input)
-                    dpi = dpi < 90 and 90 or dpi
+                    _dpi = _dpi < 90 and 90 or _dpi
-                    dpi = dpi > 330 and 330 or dpi
+                    _dpi = _dpi > 330 and 330 or _dpi
-                    G_reader_settings:saveSetting("custom_screen_dpi", dpi)
+                    G_reader_settings:saveSetting("custom_screen_dpi", _dpi)
-                    setDPI(dpi)
+                    setDPI(_dpi)
                 end,
             },
         },

frontend/ui/uimanager.lua

@@ -420,14 +420,14 @@ function UIManager:broadcastEvent(event)
     -- the widget's event handler might close widgets in which case
     -- a simple iterator like ipairs would skip over some entries
     local i = 1
-    while (i <= #self._window_stack) do
+    while i <= #self._window_stack do
         local prev_widget = self._window_stack[i].widget
         self._window_stack[i].widget:handleEvent(event)
         local top_widget = self._window_stack[i]
         if top_widget == nil then
             -- top widget closed itself
             break
-        elseif (top_window.widget == prev_widget) then
+        elseif top_widget.widget == prev_widget then
             i = i + 1
         end
     end