Update Battery widget plugin (#201)

* fix: setUpdateInterval in update function

* fix: add shellEscape on cat command

* dump version

* fix: migrate settings to desktop_widget.settings

* feat: auto gap based on the layout

* feat: retrieve warning threshold from noctalia's settings

battery-widget/widget.luau

@@ -1,10 +1,10 @@
-noctalia.setUpdateInterval(noctalia.getConfig("refresh_interval") * 1000)
-
 local glyph
 local color
 local percent
 local status
 
+local warning_threshold = 20
+
 local path = "/sys/class/power_supply/"
 local batName
 
@@ -45,8 +45,29 @@ local function getGlyph()
     end
 end
 
+local function getWarningThreshold()
+    noctalia.runAsync(
+        "grep warning_threshold ~/.local/state/noctalia/settings.toml | awk '{print $3}'",
+        function(result)
+            if result.exitCode ~= 0 then
+                noctalia.log("battery-widget: failed to get warning_threshold: " .. result.stderr)
+                return
+            end
+
+            local res = result.stdout
+
+            if not warning_threshold then
+                noctalia.log("battery-widget: invalid warning_threshold: " .. res)
+                return
+            end
+            
+            warning_threshold = tonumber(noctalia.string.trim(res))
+        end
+    )
+end
+
 local function getColor()
-    if status ~= "Charging" and percent <= 20 then
+    if status ~= "Charging" and percent <= warning_threshold then
         color = noctalia.getConfig("warning_color")
         return
     end
@@ -72,16 +93,28 @@ local function render()
         table.insert(content, ui.label({ text = percent .. "%", color = color }))
     end
 
-    local layout = noctalia.getConfig("layout") == "vertical" and ui.column or ui.row
+    local vertical = noctalia.getConfig("layout") == "vertical"
 
-    desktopWidget.render(layout({ gap = 4, align = "center" }, content))
+    local layout = vertical and ui.column or ui.row
+
+    desktopWidget.render(
+        layout({
+            gap = vertical and 0 or 4,
+            align = "center"
+        }, content)
+    )
+end
+
+local function shellEscape(raw)
+    return "'" .. raw:gsub("'", "'\\''") .. "'"
 end
 
 local function refreshBattery()
     noctalia.runAsync(
         "cat "
-        .. path .. batName .. "/capacity "
-        .. path .. batName .. "/status",
+        .. shellEscape(path .. batName .. "/capacity")
+        .. " "
+        .. shellEscape(path .. batName .. "/status"),
         function(result)
             if result.exitCode ~= 0 then
                 noctalia.log("battery-widget: failed to read battery: " .. result.stderr)
@@ -114,6 +147,9 @@ if not batName then
     return
 end
 
+getWarningThreshold()
+
 function update()
+    noctalia.setUpdateInterval(noctalia.getConfig("refresh_interval") * 1000)
     refreshBattery()
 end