Add battery and memory units for the status bar

core/cubes/modeline/statusbar-default.el

@@ -25,10 +25,33 @@
 (require 'fg42/statusbar)
 
 
-(defbar-unit battery 30 "B-"
-  (format "B%s" (with-temp-buffer
+(defmacro fg42/percentage-face (value err warn)
+  "Return the correct face with repect to VALUE and the given
+thresholds ERR adn WARN"
+  `(cond ((> ,value ,err) 'error) ((> ,value ,warn) 'warning) (t 'success)))
+
+(defbar-unit fg42/statusbar-battery 30 "B--"
+  (format "B%s"
+          (string-trim
+           (with-temp-buffer
              (insert-file-contents "/sys/class/power_supply/BAT0/capacity")
-                  (buffer-string))))
+             (buffer-string)))))
+
+
+(defbar-unit fg42/statusbar-memory 3 "M--S--"
+  (let* ((struct (string-trim
+                  (shell-command-to-string "free -k|tail -n 2|awk '{printf(\"%s,%s,\", $3, $2)}'")))
+         (vals (mapcar #'cl-parse-integer (butlast (split-string struct ","))))
+         ;; TODO: Check for division by zero
+         (m (* 100  (/ (float(car vals)) (cadr vals))))
+         ;; TODO: Check for division by zero
+         (s (* 100  (/ (float(caddr vals)) (cadddr vals))))
+         (x ))
+
+    (format
+     "M%sS%s"
+     (propertize (format "%02d" m) 'face (fg42/percentage-face m 90 75))
+     (propertize (format "%02d" s) 'face (fg42/percentage-face s 90 75)))))
 
 ;; The default modeline for FG42 that is compatible with
 ;; the FG42's status bar only
@@ -40,7 +63,8 @@
 
         (list
          :brief (list
-                 'battery
+                 'fg42/statusbar-battery
+                 'fg42/statusbar-memory
                  "|" '(buffer-name) "|" '(format-mode-line "%l:%c") "|" '(format-time-string "%m-%d %H:%M"))
          :long " "))
     ;; No GUI

core/fg42/statusbar.el

@@ -173,10 +173,14 @@ that runs the given BODY at the given INTERVAL."
     `(progn
        (defvar ,name ,default)
        (defvar ,timer-name)
+       (let ((fn (lambda () ,@body)))
          (add-hook 'fg42/statusbar-enable-hook
                    (lambda ()
                      (setq ,timer-name
-                         (run-with-timer 0 ,interval (lambda () ,@body)))))
+                           (run-with-timer 0 ,interval
+                                           (lambda ()
+                                             (setq ,name (funcall fn))))))))
+
        (add-hook 'fg42/statusbar-disable-hook
                  (lambda ()
                    (when (timerp ,timer-name)