feat: add hypr-submap plugin (#101)

* feat: add hypr-submap plugin

* fix(hypr-submap): add description key and glyph default value

* fix(hypr-submap): update dependencies and fix glyph default value in README

- Add stdbuf and hyprctl to the dependencies list in `README.md` and `plugin.toml`.
- Correct the documented default value of glyph to match the actual implementation.

hypr-submap/submap.luau

@@ -0,0 +1,58 @@
+local currentSubmap = ""
+
+local function socketPath()
+    local sig = noctalia.getenv("HYPRLAND_INSTANCE_SIGNATURE")
+    local runtimeDir = noctalia.getenv("XDG_RUNTIME_DIR")
+    if sig == nil or runtimeDir == nil then
+        return nil
+    end
+    return `{runtimeDir}/hypr/{sig}/.socket2.sock`
+end
+
+local function render()
+    local hideWhenDefault = noctalia.getConfig("hide_when_default")
+    local prefix = noctalia.getConfig("prefix")
+    local glyph = noctalia.getConfig("glyph")
+
+    if glyph and glyph ~= "" then
+        barWidget.setGlyph(glyph)
+    end
+
+    if currentSubmap == "" or currentSubmap == "default" then
+        if hideWhenDefault then
+            barWidget.setVisible(false)
+            return
+        end
+        barWidget.setVisible(true)
+        barWidget.setText(`{prefix}default`)
+        return
+    end
+
+    barWidget.setVisible(true)
+    barWidget.setText(`{prefix}{currentSubmap}`)
+end
+
+local sock = socketPath()
+if sock ~= nil then
+    noctalia.runAsync("hyprctl submap", function(output)
+        if output ~= nil then
+            currentSubmap = noctalia.string.trim(output)
+            render()
+        end
+    end)
+    noctalia.runStream(`stdbuf -oL -eL socat -u UNIX-CONNECT:{sock} -`, function(line)
+        local match = line:match("submap>>(.*)")
+        if match ~= nil then
+            currentSubmap = noctalia.string.trim(match)
+            render()
+        end
+    end)
+end
+
+function update()
+    render()
+end
+
+function onClick()
+    noctalia.runAsync("hyprctl dispatch 'hl.dsp.submap(\"reset\")' ")
+end