From 578cc7723cbb5cbc05d5b92a617140b1162c4456 Mon Sep 17 00:00:00 2001
From: Tobias Berger <toby@tobot.dev>
Date: Thu, 4 Jan 2024 23:28:47 +0100
Subject: [PATCH] feat: minimum viable product

---
 Cargo.lock  | 239 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   3 +
 src/main.rs | 106 ++++++++++++++++++-----
 3 files changed, 326 insertions(+), 22 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index f2ed816..8d95fbf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -71,6 +71,21 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc7eb209b1518d6bb87b283c20095f5228ecda460da70b44f0802523dea6da04"
 
+[[package]]
+name = "android-tzdata"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "arboard"
 version = "3.3.0"
@@ -229,6 +244,19 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "chrono"
+version = "0.4.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f2c685bad3eb3d45a01354cedb7d5faa66194d1d58ba6e267a8de788f79db38"
+dependencies = [
+ "android-tzdata",
+ "iana-time-zone",
+ "num-traits",
+ "serde",
+ "windows-targets 0.48.5",
+]
+
 [[package]]
 name = "clipboard-win"
 version = "4.5.0"
@@ -564,6 +592,95 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "futures"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "645c6916888f6cb6350d2550b80fb63e734897a8498abe35cfb732b6487804b0"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-executor",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
+]
+
+[[package]]
+name = "futures-channel"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eac8f7d7865dcb88bd4373ab671c8cf4508703796caa2b1985a9ca867b3fcb78"
+dependencies = [
+ "futures-core",
+ "futures-sink",
+]
+
+[[package]]
+name = "futures-core"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfc6580bb841c5a68e9ef15c77ccc837b40a7504914d52e47b8b0e9bbda25a1d"
+
+[[package]]
+name = "futures-executor"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a576fc72ae164fca6b9db127eaa9a9dda0d61316034f33a0a0d4eda41f02b01d"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "futures-util",
+]
+
+[[package]]
+name = "futures-io"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a44623e20b9681a318efdd71c299b6b222ed6f231972bfe2f224ebad6311f0c1"
+
+[[package]]
+name = "futures-macro"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87750cf4b7a4c0625b1529e4c543c2182106e4dedc60a2a6455e00d212c489ac"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.48",
+]
+
+[[package]]
+name = "futures-sink"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fb8e00e87438d937621c1c6269e53f536c14d3fbd6a042bb24879e57d474fb5"
+
+[[package]]
+name = "futures-task"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38d84fa142264698cdce1a9f9172cf383a0c82de1bddcf3092901442c4097004"
+
+[[package]]
+name = "futures-util"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d6401deb83407ab3da39eba7e33987a73c3df0c82b4bb5813ee871c19c41d48"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-macro",
+ "futures-sink",
+ "futures-task",
+ "memchr",
+ "pin-project-lite",
+ "pin-utils",
+ "slab",
+]
+
 [[package]]
 name = "gethostname"
 version = "0.3.0"
@@ -687,6 +804,43 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "homedir"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22074da8bba2ef26fc1737ae6c777b5baab5524c2dc403b5c6a76166766ccda5"
+dependencies = [
+ "cfg-if",
+ "nix 0.26.4",
+ "serde",
+ "widestring",
+ "windows-sys 0.48.0",
+ "wmi",
+]
+
+[[package]]
+name = "iana-time-zone"
+version = "0.1.59"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6a67363e2aa4443928ce15e57ebae94fd8949958fd1223c4cfc0cd473ad7539"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "idna"
 version = "0.5.0"
@@ -977,6 +1131,7 @@ dependencies = [
  "cfg-if",
  "libc",
  "memoffset 0.7.1",
+ "pin-utils",
 ]
 
 [[package]]
@@ -1165,6 +1320,18 @@ version = "2.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
 
+[[package]]
+name = "pin-project-lite"
+version = "0.2.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8afb450f006bf6385ca15ef45d71d2288452bc3683ce2e2cacc0d18e4be60b58"
+
+[[package]]
+name = "pin-utils"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
+
 [[package]]
 name = "pkg-config"
 version = "0.3.28"
@@ -1306,6 +1473,15 @@ version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d66dc143e6b11c1eddc06d5c423cfc97062865baf299914ab64caa38182078fe"
 
+[[package]]
+name = "slab"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f92a496fb766b417c996b9c5e57daf2f7ad3b0bebe1ccfca4856390e3d3bb67"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "slotmap"
 version = "1.0.7"
@@ -1424,6 +1600,7 @@ name = "todoodoo"
 version = "0.1.0"
 dependencies = [
  "eframe",
+ "homedir",
 ]
 
 [[package]]
@@ -1697,6 +1874,12 @@ dependencies = [
  "web-sys",
 ]
 
+[[package]]
+name = "widestring"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "653f141f39ec16bba3c5abe400a0c60da7468261cc2cbf36805022876bc721a8"
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -1737,6 +1920,48 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
+[[package]]
+name = "windows"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e686886bc078bc1b0b600cac0147aadb815089b6e4da64016cbd754b6342700f"
+dependencies = [
+ "windows-implement",
+ "windows-interface",
+ "windows-targets 0.48.5",
+]
+
+[[package]]
+name = "windows-core"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33ab640c8d7e35bf8ba19b884ba838ceb4fba93a4e8c65a9059d08afcfc683d9"
+dependencies = [
+ "windows-targets 0.52.0",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e2ee588991b9e7e6c8338edf3333fbe4da35dc72092643958ebb43f0ab2c49c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "windows-interface"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6fb8df20c9bcaa8ad6ab513f7b40104840c8867d5751126e4df3b08388d0cc7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.45.0"
@@ -1978,6 +2203,20 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "wmi"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ced703d10188571ce53582c2932ce640ed3c413cff7ee6e2d961f9abdb6a63d1"
+dependencies = [
+ "chrono",
+ "futures",
+ "log",
+ "serde",
+ "thiserror",
+ "windows",
+]
+
 [[package]]
 name = "x11-dl"
 version = "2.21.0"
diff --git a/Cargo.toml b/Cargo.toml
index 95191ea..142f40b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,3 +28,6 @@ codegen-units = 1
 version = "0.24"
 default-features = false
 features = [ "wayland", "default_fonts", "glow", "persistence" ]
+
+[dependencies.homedir]
+version = "0.2"
diff --git a/src/main.rs b/src/main.rs
index ee4b6b7..d3b877a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,34 +1,96 @@
-use eframe::egui;
+use std::{
+    error::Error,
+    fmt::{self, Debug, Display},
+    fs::{File, OpenOptions},
+    io::{Read, Seek, SeekFrom, Write},
+    path::Path,
+};
 
-fn main() {
+use eframe::egui::{self, Key, TextEdit};
+
+enum RunError {
+    HomeDir(homedir::GetHomeError),
+    NoHome,
+    OpenFile(std::io::Error),
+    EFrame(eframe::Error),
+}
+
+impl Debug for RunError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        Display::fmt(self, f)
+    }
+}
+impl Display for RunError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::HomeDir(e) => f.write_fmt(format_args!("homedir error: {e}")),
+            Self::NoHome => f.write_fmt(format_args!("failed to find home directory")),
+            Self::OpenFile(e) => f.write_fmt(format_args!("error while opening todo.txt: {e}")),
+            Self::EFrame(e) => f.write_fmt(format_args!("eframe error: {e}")),
+        }
+    }
+}
+impl Error for RunError {}
+
+fn main() -> Result<(), RunError> {
     std::env::set_var("WINIT_UNIX_BACKEND", "wayland");
+    let home_dir = homedir::get_my_home()
+        .map_err(RunError::HomeDir)?
+        .ok_or(RunError::NoHome)?;
+    let todo_file = OpenOptions::new()
+        .create(true)
+        .read(true)
+        .write(true)
+        .append(false)
+        .open(Path::join(&home_dir, "todo.txt"))
+        .map_err(RunError::OpenFile)?;
+
     let native_options = eframe::NativeOptions::default();
-    if let Err(err) = eframe::run_native(
-        "My egui App",
+    eframe::run_native(
+        "To-DooDoo",
         native_options,
-        Box::new(|cc| Box::new(MyEguiApp::new(cc))),
-    ) {
-        eprintln!("{err}");
+        Box::new(|_cc| Box::new(ToDooDooApp::new(todo_file))),
+    )
+    .map_err(RunError::EFrame)?;
+    Ok(())
+}
+
+struct ToDooDooApp {
+    notes: String,
+    file: File,
+}
+
+impl ToDooDooApp {
+    fn new(mut file: File) -> Self {
+        let mut notes = String::with_capacity(
+            file.metadata()
+                .expect("file metadata")
+                .len()
+                .try_into()
+                .expect("file too big"),
+        );
+        file.read_to_string(&mut notes)
+            .expect("failed to read file");
+        Self { file, notes }
+    }
+
+    fn save(&mut self) {
+        self.file.set_len(0).expect("failed to truncate file");
+        self.file.seek(SeekFrom::Start(0)).expect("failed to seek");
+        self.file
+            .write_all(self.notes.as_bytes())
+            .expect("failed to write file");
+        self.file.flush().expect("failed to flush");
     }
 }
 
-#[derive(Default)]
-struct MyEguiApp {}
-
-impl MyEguiApp {
-    fn new(_cc: &eframe::CreationContext<'_>) -> Self {
-        // Customize egui here with cc.egui_ctx.set_fonts and cc.egui_ctx.set_visuals.
-        // Restore app state using cc.storage (requires the "persistence" feature).
-        // Use the cc.gl (a glow::Context) to create graphics shaders and buffers that you can use
-        // for e.g. egui::PaintCallback.
-        Self::default()
-    }
-}
-
-impl eframe::App for MyEguiApp {
+impl eframe::App for ToDooDooApp {
     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
         egui::CentralPanel::default().show(ctx, |ui| {
-            ui.heading("Hello World!");
+            if ctx.input(|i| i.key_pressed(Key::S) && i.modifiers.command) {
+                self.save();
+            }
+            ui.add_sized(ui.available_size(), TextEdit::multiline(&mut self.notes));
         });
     }
 }