Add module system, backlight control

2019-07-31 00:42:03 +02:00
parent 9d2dd4ec37
commit 0a4e0829b9
8 changed files with 611 additions and 234 deletions
@@ -0,0 +1,135 @@
+use crate::module::{ModuleImpl, Input};
+use crate::buffer::Buffer;
+use crate::color::Color;
+use crate::draw::{draw_text, ROBOTO_REGULAR};
+
+use std::fs::OpenOptions;
+use std::path::{Path, PathBuf};
+use std::io::{Read, Write};
+use std::io::{Error, ErrorKind};
+use chrono::{DateTime, Local};
+
+pub struct Backlight {
+    device_path: PathBuf,
+    cur_brightness: u64,
+    max_brightness: u64,
+    dirty: bool,
+}
+
+fn read_file_as_u64(path: &Path) -> Result<u64, Error> {
+    let mut file = OpenOptions::new()
+            .read(true)
+            .open(path)?;
+    let mut str = String::new();
+    file.read_to_string(&mut str)?;
+    str.pop();
+    str.parse::<u64>().map_err(|_e| {Error::new(ErrorKind::Other, "unable to parse value")})
+}
+
+fn write_file_as_u64(path: &Path, value: u64) -> Result<(), Error> {
+    let mut file = OpenOptions::new()
+            .write(true)
+            .open(path)?;
+    file.write_fmt(format_args!("{}", value))
+}
+
+impl Backlight {
+    pub fn update(&mut self) -> Result<(), Error> {
+        self.cur_brightness = read_file_as_u64(self.device_path.join("brightness").as_path())?;
+        self.max_brightness = read_file_as_u64(self.device_path.join("max_brightness").as_path())?;
+        self.dirty = true;
+        Ok(())
+    }
+
+    pub fn sync(&mut self) -> Result<(), Error> {
+        write_file_as_u64(self.device_path.join("brightness").as_path(), self.cur_brightness)?;
+        self.update()?;
+        Ok(())
+    }
+
+    pub fn brightness(&self) -> f32 {
+        if self.cur_brightness > self.max_brightness {
+            // what.
+            return 100.0;
+        }
+
+        (self.cur_brightness as f32 / self.max_brightness as f32) * 100.0
+    }
+
+    pub fn add(&mut self, diff: f32) -> Result<(), Error> {
+        let inc = ((self.max_brightness as f32) / 100.0 * diff) as i64;
+
+        self.cur_brightness = if self.cur_brightness as i64 + inc < 1 {
+            1
+        } else if self.cur_brightness as i64 + inc > self.max_brightness as i64 {
+            self.max_brightness
+        } else {
+            (self.cur_brightness as i64 + inc) as u64
+        };
+
+        Ok(())
+    }
+
+    pub fn default() -> Result<Self, Error> {
+        let devices = Path::new("/sys/class/backlight")
+                           .read_dir()?;
+
+        let first_device = devices.take(1).next().unwrap().unwrap();
+        let mut dev = Backlight{
+            device_path: first_device.path(),
+            cur_brightness: 0,
+            max_brightness: 0,
+            dirty: true,
+        };
+
+        dev.update()?;
+
+        Ok(dev)
+    }
+}
+
+impl ModuleImpl for Backlight {
+    fn draw(&self, buf: &mut Buffer, bg: &Color, _time: &DateTime<Local>) -> Result<Vec<(i32, i32, i32, i32)>, Error> {
+        buf.memset(bg);
+        draw_text(
+            ROBOTO_REGULAR,
+            &mut buf.subdimensions((0, 0, 256, 24)),
+            bg,
+            &Color::new(1.0, 1.0, 1.0, 1.0),
+            24.0,
+            &format!("backlight: {:}%", self.brightness() as u8),
+        )?;
+        Ok(vec![buf.get_signed_bounds()])
+    }
+
+    fn update(&mut self, _time: &DateTime<Local>, force: bool) -> Result<bool, ::std::io::Error>{
+        if self.dirty || force {
+            self.dirty = false;
+            Ok(true)
+        } else {
+            Ok(false)
+        }
+    }
+
+    fn input(&mut self, input: Input) {
+        match input {
+            Input::Scroll{pos: _pos, x: _x, y} => {
+                self.add((y * -1.0) as f32 / 8.0).unwrap();
+                self.sync().unwrap();
+            },
+            Input::Click{pos: _pos, button} => {
+                match button {
+                    273 => { // Right click
+                        self.cur_brightness = if self.cur_brightness == 1 {
+                            self.max_brightness
+                        } else {
+                            1
+                        };
+                        self.sync().unwrap();
+                    },
+                    _ => {}
+                }
+            },
+        }
+    }
+}