From 8fb35efbfd14e38ed1f6b369b4ef879f2d8de73c Mon Sep 17 00:00:00 2001
From: dianshi <dianshi@main.lv>
Date: Sat, 18 Jul 2020 22:18:41 +0100
Subject: working backlight setter

---
 obacklight/obacklight.ml | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/obacklight/obacklight.ml b/obacklight/obacklight.ml
index f5eb296..8edb381 100644
--- a/obacklight/obacklight.ml
+++ b/obacklight/obacklight.ml
@@ -30,6 +30,39 @@ begin
     set_backlight_brightness_path ()
 end
 
+let read_data filename = 
+    let ic = open_in filename in 
+    try
+        let line = input_line ic in 
+        close_in ic;
+        (line)
+    with e ->
+        close_in_noerr ic;
+        raise e
+
+let show_brightness () = 
+    let b = read_data !default_backlight_brightness_path in
+    let mb = read_data !default_backlight_maxbrightness_path in
+    let _  = Printf.printf "Brightness:     %s\n" b in
+             Printf.printf "Max Brightness: %s\n" mb
+
+(* Set brightness from 0-100% *)
+let write_data filename a = 
+    let oc = open_out filename in
+    output_string oc a;
+    close_out oc;;
+
+let set_brightness brightness_path nv = 
+    let mb = read_data !default_backlight_maxbrightness_path in
+    let i_mb = int_of_string mb in
+    let nv_percent =((float_of_int nv) /. 100.0) *. (float_of_int i_mb) in
+    let _ = Printf.printf "%f\n" nv_percent in
+    write_data brightness_path (string_of_int (int_of_float nv_percent))
+
+
+
+let arg_num = Array.length Sys.argv
+
 let main = 
 begin
     
@@ -40,7 +73,11 @@ begin
     let usage_msg = "set backlight value" in
     let _ = Arg.parse speclist print_endline usage_msg in
     (* If there is not argument print value of default path *)
+    if arg_num == 1 then
+        show_brightness();
     (* If there is 1 argument set value to brigthness *)
+    if arg_num == 2 then
+        set_brightness !default_backlight_brightness_path (int_of_string Sys.argv.(1));
     
     print_debug ();
 end
-- 
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