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+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.81"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2afee18b8beb5a596ecb4a2dce128c719b4ba399d34126b9e4396e3f9860966"
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+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
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+dependencies = [
+ "anyhow",
+ "cfg-expr 0.8.1",
+ "heck",
+ "itertools",
+ "pkg-config",
+ "strum",
+ "strum_macros",
+ "thiserror",
+ "toml",
+ "version-compare",
+]
+
+[[package]]
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+ "cfg-expr 0.9.0",
+ "heck",
+ "pkg-config",
+ "toml",
+ "version-compare",
+]
+
+[[package]]
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+checksum = "854babe52e4df1653706b98fcfc05843010039b406875930a70e4d9644e5c417"
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+ "thiserror-impl",
+]
+
+[[package]]
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+ "proc-macro2",
+ "quote",
+ "syn",
+]
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+[[package]]
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+ "libc",
+ "wasi",
+ "winapi",
+]
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+ "serde",
+]
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+
+[[package]]
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+version = "0.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c18c859eead79d8b95d09e4678566e8d70105c4e7b251f707a03df32442661b"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..0f6e92e
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "calendar"
+version = "0.1.0"
+authors = ["Joris Guyonvarch"]
+edition = "2018"
+
+[dependencies]
+gtk4 = { version = "0.3", features = ["v4_2"] }
+chrono = "0.4"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c27e3f7
--- /dev/null
+++ b/README.md
@@ -0,0 +1,52 @@
+# Getting started
+
+```bash
+nix develop --command cargo run
+```
+
+# TODO
+
+## Show events at specific days
+
+1. Modelize an event as Day + Option<Time>.
+2. Define a simple test list of events.
+3. Show it on the calendar (Order events by time).
+4. Add ellipsis in case an event description is too long, and show the complete
+   message when hovering the mouse.
+5. Allow to scroll vertically through events if there are a lot of events one day.
+
+## CRUD
+
+1. Show a form popup when double clicking on a day.
+2. Save to DB and update the calendar on validating.
+3. Read events from DB on startup.
+4. Modify an event when double clicking.
+5. Delete an event (Right click > Delete).
+
+## Complex event
+
+Be able to specify repetition.
+
+1. Modelize an event.
+2. Update the form.
+3. Update the view.
+4. Update a repetition event.
+
+## API
+
+1. Get list of events today.
+
+## Calendar focus
+
+1. Select previous week (up arrow, scrolling).
+2. Select Next week (down arrow, scrolling).
+3. Select the default focus.
+
+## Type
+
+1. CRUD for list of types (name + color).
+2. Show / hide depending on the type.
+
+## Nice to have
+
+1. Drag & drop events.
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..3a7077c
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,66 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1637014545,
+        "narHash": "sha256-26IZAc5yzlD9FlDT54io1oqG/bBoyka+FJk5guaX4x4=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "bba5dcc8e0b20ab664967ad83d24d64cb64ec4f4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1637427387,
+        "narHash": "sha256-Ity623Tj1mekcvT2Qyh/j4XB3HNhPdvt2LGZLdFjL3I=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "be2bc44d0e12d0fbb5f89fe410fa6c3baa64ef3c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1637374599,
+        "narHash": "sha256-mIzHDYJmUMPO5TLJuYEfZ0suCIAbEEJ0SfaGRuPruLE=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "2f57158fe403075e918fb05a689313b227883be8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..b146d72
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,31 @@
+{
+  inputs = {
+    nixpkgs.url      = "github:nixos/nixpkgs";
+    flake-utils.url  = "github:numtide/flake-utils";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
+    rust-overlay.inputs.flake-utils.follows = "flake-utils";
+  };
+
+  outputs = { self, nixpkgs, rust-overlay, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+      in
+      with pkgs;
+      {
+        devShell = mkShell {
+          buildInputs = [
+            rust-bin.stable."1.56.1".default
+            cargo-watch
+            pkgconfig
+            graphene
+            gtk4
+          ];
+        };
+      }
+    );
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..072fbd5
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,101 @@
+use chrono::{NaiveDate, Datelike, Weekday};
+use gtk4::gdk::Display;
+use gtk4::prelude::*;
+use gtk4::{
+    Align, Application, ApplicationWindow, CssProvider, Grid, Label, Orientation, StyleContext,
+    STYLE_PROVIDER_PRIORITY_APPLICATION, Box as GtkBox
+};
+
+static DAYS: [&str; 7] = ["LUN", "MAR", "MER", "JEU", "VEN", "SAM", "DIM"];
+static MONTHES: [&str; 12] = ["Jan", "Fév", "Mar", "Avr", "Mai", "Juin", "Juil", "Aoû", "Sep", "Oct", "Nov", "Déc"];
+
+fn main() {
+    let application = Application::new(Some("me.guyonvarch.calendar"), Default::default());
+    application.connect_startup(build_ui);
+    application.run();
+}
+
+fn build_ui(application: &Application) {
+    let window = ApplicationWindow::new(application);
+    window.set_title(Some("Calendar"));
+    window.set_default_size(800, 600);
+    window.set_hexpand(true);
+    window.set_vexpand(true);
+
+    load_style();
+
+    let grid = Grid::builder().build();
+
+    window.set_child(Some(&grid));
+
+    for col in 0..7 {
+        grid.attach(&day_title(col), col, 0, 1, 1);
+    }
+
+    let today = chrono::offset::Local::today().naive_utc();
+    let last_monday = NaiveDate::from_isoywd(today.year(), today.iso_week().week(), Weekday::Mon);
+
+    let mut d = last_monday;
+    for row in 1..5 {
+        for col in 0..7 {
+            grid.attach(&day_entry(&today, &d), col, row, 1, 1);
+            d = d.succ();
+        }
+    }
+
+    window.show();
+}
+
+fn load_style() {
+    let provider = CssProvider::new();
+    provider.load_from_data(include_bytes!("style.css"));
+    StyleContext::add_provider_for_display(
+        &Display::default().expect("Error initializing gtk css provider."),
+        &provider,
+        STYLE_PROVIDER_PRIORITY_APPLICATION,
+    );
+}
+
+fn day_title(col: i32) -> GtkBox {
+    let vbox = GtkBox::builder()
+        .orientation(Orientation::Vertical)
+        .hexpand(true)
+        .build();
+
+    vbox.add_css_class("g-Calendar__DayTitle");
+
+    let label = Label::builder()
+        .label(DAYS[col as usize])
+        .halign(Align::Center)
+        .valign(Align::Center)
+        .build();
+    vbox.append(&label);
+
+    vbox
+}
+
+fn day_entry(today: &NaiveDate, d: &NaiveDate) -> GtkBox {
+    let vbox = GtkBox::builder()
+        .orientation(Orientation::Vertical)
+        .hexpand(true)
+        .vexpand(true)
+        .build();
+
+    vbox.add_css_class("g-Calendar__Day");
+
+    if d == today {
+        vbox.add_css_class("g-Calendar__Day--Today");
+    }
+
+    let label = Label::builder()
+        .label(&format!("{} {}", d.day(), MONTHES[d.month0() as usize]))
+        .halign(Align::Start)
+        .valign(Align::Center)
+        .build();
+
+    label.add_css_class("g-Calendar__DayNumber");
+
+    vbox.append(&label);
+
+    vbox
+}
diff --git a/src/style.css b/src/style.css
new file mode 100644
index 0000000..bd58799
--- /dev/null
+++ b/src/style.css
@@ -0,0 +1,20 @@
+.g-Calendar__DayTitle {
+  border: 1px solid #CCCCCC;
+  font-weight: bold;
+  padding: 4px;
+}
+
+.g-Calendar__Day {
+  background-color: white;
+  border: 1px solid #CCCCCC;
+  padding: 4px;
+}
+
+.g-Calendar__Day--Today {
+  background-color: #FFEC40;
+}
+
+.g-Calendar__DayNumber {
+  color: #333333;
+  font-size: 90%;
+}