Add /calendar

showbits-thermal-printer/Cargo.toml

@@ -16,6 +16,7 @@ rust-embed = "8.3.0"
 serde = { version = "1.0.197", features = ["derive"] }
 showbits-common.workspace = true
 taffy.workspace = true
+time = "0.3.34"
 tokio = { version = "1.36.0", features = ["full"] }
 
 [lints]

showbits-thermal-printer/src/drawer.rs

@@ -1,3 +1,5 @@
+mod calendar;
+
 use image::RgbaImage;
 use showbits_common::{
     color::{BLACK, WHITE},
@@ -20,6 +22,7 @@ pub enum Command {
     Image(RgbaImage),
     Photo { image: RgbaImage, title: String },
     ChatMessage { username: String, content: String },
+    Calendar { year: i32, month: u8 },
 }
 
 #[derive(Default)]
@@ -72,6 +75,7 @@ impl Drawer {
             Command::ChatMessage { username, content } => {
                 self.on_chat_message(username, content)?
             }
+            Command::Calendar { year, month } => self.draw_calendar(year, month)?,
         }
         Ok(())
     }

showbits-thermal-printer/src/drawer/calendar.rs

@@ -0,0 +1,89 @@
+use showbits_common::{
+    color::{BLACK, WHITE},
+    widgets::{Block, Text},
+    Node, Tree, WidgetExt,
+};
+use taffy::{
+    style_helpers::{length, percent, repeat}, AlignContent, AlignItems, Display, FlexDirection
+};
+use time::Date;
+
+use super::{Context, Drawer};
+
+impl Drawer {
+    pub fn draw_calendar(&mut self, year: i32, month: u8) -> anyhow::Result<()> {
+        let mut date = Date::from_calendar_date(year, month.try_into()?, 1)?;
+
+        let mut tree = Tree::<Context>::new(WHITE);
+
+        let mut grid = Node::empty()
+            .with_display(Display::Grid)
+            .with_grid_template_columns(vec![repeat(7, vec![length(50.0)])])
+            .with_grid_auto_rows(vec![length(50.0)])
+            .with_gap(length(2.0));
+
+        for weekday in ["Mo", "Di", "Mi", "Do", "Fr", "Sa", "So"] {
+            let text = Text::new()
+                .with_metrics(Text::default_metrics().scale(2.0))
+                .and_plain(weekday)
+                .widget(&mut self.ctx.font_stuff)
+                .node()
+                .with_justify_self(Some(AlignItems::Center))
+                .with_align_self(Some(AlignItems::Center))
+                .register(&mut tree)?;
+
+            grid = grid.and_child(text);
+        }
+
+        let placeholders = date.weekday().number_days_from_monday();
+        for _ in 0..placeholders {
+            let empty = Node::empty().register(&mut tree)?;
+            grid = grid.and_child(empty);
+        }
+
+        loop {
+            let day = Text::new()
+                .and_plain(date.day().to_string())
+                .widget(&mut self.ctx.font_stuff)
+                .node()
+                .register(&mut tree)?;
+
+            let block = Block::new()
+                .with_border(BLACK)
+                .node()
+                .with_border(length(2.0))
+                .with_display(Display::Flex)
+                .with_justify_content(Some(AlignContent::Center))
+                .with_align_items(Some(AlignItems::Center))
+                .and_child(day)
+                .register(&mut tree)?;
+
+            grid = grid.and_child(block);
+
+            let next_day = date.next_day().unwrap();
+            if date.month() != next_day.month() {
+                break;
+            }
+            date = next_day;
+        }
+
+        let title = Text::new()
+            .and_plain(format!("Ankreuzkalender {year:04}-{month:02}"))
+            .widget(&mut self.ctx.font_stuff)
+            .node()
+            .register(&mut tree)?;
+
+        let root = Node::empty()
+            .with_size_width(percent(1.0))
+            .with_padding_bottom(length(Self::FEED))
+            .with_display(Display::Flex)
+            .with_flex_direction(FlexDirection::Column)
+            .with_align_items(Some(AlignItems::Center))
+            .and_child(title)
+            .and_child(grid.register(&mut tree)?)
+            .register(&mut tree)?;
+
+        self.printer.print_tree(&mut tree, &mut self.ctx, root)?;
+        Ok(())
+    }
+}

showbits-thermal-printer/src/server.rs

@@ -30,6 +30,7 @@ pub async fn run(tx: mpsc::Sender<Command>, addr: String) -> anyhow::Result<()>
         .route("/image", post(post_image).fallback(get_static_file))
         .route("/photo", post(post_photo).fallback(get_static_file))
         .route("/chat_message", post(post_chat_message))
+        .route("/calendar", post(post_calendar))
         .fallback(get(get_static_file))
         .layer(DefaultBodyLimit::max(32 * 1024 * 1024)) // 32 MiB
         .with_state(Server { tx });
@@ -124,3 +125,19 @@ async fn post_chat_message(server: State<Server>, request: Form<PostChatMessageF
         })
         .await;
 }
+
+#[derive(Deserialize)]
+struct PostCalendarForm {
+    year: i32,
+    month: u8,
+}
+
+async fn post_calendar(server: State<Server>, request: Form<PostCalendarForm>) {
+    let _ = server
+        .tx
+        .send(Command::Calendar {
+            year: request.0.year,
+            month: request.0.month,
+        })
+        .await;
+}