Fix/gamelauncher nixos build (#225)

* game-launcher: bundle self-contained SQLite reader, drop libsqlite3 dependency

Fixes building gamelauncher.c on NixOS where the runtime env lacks
sqlite3.h/libsqlite3. scan_lutris now reads Lutris' pga.db through a
bundled read-only SQLite file parser instead of linking sqlite3.

* game-launcher: rework /g provider to reuse panel scan results

The launcher provider now reads the games the panel already scanned via
state/cache, trims the query, and surfaces status/error rows instead of
duplicating the scan.

---------

Co-authored-by: Ahmed5Emad <ahmed5emad@users.noreply.github.com>

game-launcher/search.luau

@@ -1,78 +1,92 @@
 local games = {}
-local ready = false
-local binary = noctalia.pluginDir() .. "/gamelauncher"
-local cSource = noctalia.pluginDir() .. "/gamelauncher.c"
+local lastQuery = ""
+
+local function statusRow(title, subtitle, glyph)
+  return { id = "", title = title, subtitle = subtitle, glyph = glyph }
+end
 
 local function isRunnerEnabled(runner)
   local ok, val = pcall(noctalia.getConfig, runner .. "_enabled")
-  if ok then return val == true or val == "true" end
+  if ok and val ~= nil then return val == true or val == "true" end
   return true
 end
 
-local function getRunnerFlags()
-  local flags = ""
-  if isRunnerEnabled("steam") then flags = flags .. " --steam" end
-  if isRunnerEnabled("lutris") then flags = flags .. " --lutris" end
-  if isRunnerEnabled("heroic") then flags = flags .. " --heroic" end
-  return flags
+local function loadGames()
+  local ok, v = pcall(noctalia.state.get, "games")
+  if ok and type(v) == "table" and #v > 0 then
+    games = v
+    return true
+  end
+  local base = noctalia.getenv("XDG_CACHE_HOME")
+  if not base or #base == 0 then
+    local home = noctalia.getenv("HOME") or ""
+    base = home .. "/.cache"
+  end
+  local raw = noctalia.readFile(base .. "/gamelauncher/games.json")
+  if raw then
+    local parsed = noctalia.json.decode(raw)
+    if type(parsed) == "table" and #parsed > 0 then
+      games = parsed
+      return true
+    end
+  end
+  return false
 end
 
-local function ensureGames(cb)
-  local function runScan()
-    local ok = noctalia.runAsync(binary .. getRunnerFlags() .. " --force", function(res)
-      if res.exitCode == 0 and res.stdout and #res.stdout > 0 then
-        local parsed, err = noctalia.json.decode(res.stdout)
-        if parsed then
-          games = parsed
-          ready = true
-        end
-      end
-      cb()
-    end)
-    if not ok then cb() end
+local function filterRows(text)
+  local lower = noctalia.string.trim(text):lower()
+  local results = {}
+  for _, g in ipairs(games) do
+    if g.name and g.runner and g.name:lower():find(lower, 1, true) and isRunnerEnabled(g.runner) then
+      local meta = { steam = { glyph = "brand-steam", color = "steam" }, lutris = { glyph = "device-gamepad", color = "warning" }, heroic = { glyph = "app-window", color = "heroic" } }
+      local m = meta[g.runner] or { glyph = "app-window", color = "on_surface" }
+      table.insert(results, {
+        id = g.id,
+        title = g.name,
+        subtitle = "Launch via " .. g.runner,
+        glyph = m.glyph,
+      })
+    end
   end
-  if ready then
-    cb()
-    return
+  if #results == 0 then
+    if #games == 0 then
+      return {
+        statusRow("No games found", "Open the Game Launcher panel to scan your games first.", "app-window"),
+      }
+    end
+    return {
+      statusRow("No games found", "Nothing matches \"" .. text .. "\". Try a different name.", "app-window"),
+    }
   end
-  if not noctalia.fileExists(binary) then
-    local ok = noctalia.runAsync("cc -o " .. binary .. " " .. cSource .. " -lsqlite3", function(res)
-      if res.exitCode == 0 then
-        runScan()
-      else
-        cb()
-      end
-    end)
-    if not ok then cb() end
-    return
-  end
-  runScan()
+  return results
 end
 
+pcall(function()
+  noctalia.state.watch("games", function(v)
+    if type(v) == "table" then
+      games = v
+      if lastQuery ~= "" then
+        launcher.setResults(lastQuery, filterRows(lastQuery))
+      end
+    end
+  end)
+end)
+
 function onQuery(text)
+  lastQuery = text
   if text == "" then
     launcher.setResults(text, {
-      { id = "hint", title = "Type a game name to search", glyph = "device-gamepad-2" },
+      statusRow("Type a game name to search", "Searches Steam, Lutris, and Heroic.", "device-gamepad-2"),
     })
     return
   end
-  ensureGames(function()
-    local lower = text:lower()
-    local results = {}
-    for _, g in ipairs(games) do
-      if g.name:lower():find(lower, 1, true) and isRunnerEnabled(g.runner) then
-        local meta = { steam = { glyph = "brand-steam", color = "steam" }, lutris = { glyph = "device-gamepad", color = "warning" }, heroic = { glyph = "app-window", color = "heroic" } }
-        local m = meta[g.runner] or { glyph = "app-window", color = "on_surface" }
-        table.insert(results, {
-          id = g.id,
-          title = g.name,
-          subtitle = "Launch via " .. g.runner,
-          glyph = m.glyph,
-        })
-      end
-    end
-    launcher.setResults(text, results)
-  end)
+  if not loadGames() then
+    launcher.setResults(text, {
+      statusRow("No games loaded", "Open the Game Launcher panel first so it can scan your games.", "device-gamepad-2"),
+    })
+    return
+  end
+  launcher.setResults(text, filterRows(text))
 end
 
 local function isValidProtocol(cmd)
@@ -87,6 +101,7 @@ local function isValidProtocol(cmd)
 end
 
 function onActivate(id)
+  if id == "" then return end
   for _, g in ipairs(games) do
     if g.id == id and g.run_command and #g.run_command > 0 and isValidProtocol(g.run_command) then
       noctalia.runAsync('xdg-open "' .. g.run_command .. '"')