Too many changes to enumerate

Cargo.toml

@@ -11,13 +11,24 @@ repository = "https://"
 keywords = ["tui", "cli", "rpn"]
 categories = ["command-line-utilities"]
 
+[workspace]
+members = [
+    ".",
+    "./rpn_rs_tui/",
+    "./rpn_rs_gui/",
+]
+
 [dependencies]
-crossterm = "0.18"
-tui = { version = "0.14", default-features = false, features = ['crossterm'] }
 serde = {version = "1.0", features = ["derive"]}
 # confy = "0.4.0"
 toml = "0.4.2"
 lazy_static = "1.4.0"
+rust_decimal = { version = "1.29.1", features=["maths"] }
+rust_decimal_macros = "1.29.1"
+tracing-subscriber = { version = "0.3.17", features = ["env-filter"] }
+tracing-appender = "0.2.2"
+tracing = "0.1.37"
+egui_extras = "0.22.0"
 
 [dependencies.confy]
 # TODO: Update this to v0.5.0 when it finally comes out -- for now, use latest git master

README.adoc

@@ -133,3 +133,7 @@ Will I implement these features? I don't know. Lots of these could be done by se
 * Bases: Not yet
 * Different math operators like `!` or `sum`: If someone asks me to, I guess
 * Conditionals: If someone asks me to, I guess
+
+=== Credits
+
+* LCD Solid Font licensed as public domain from: https://www.fontspace.com/lcd-solid-font-f11346

rpn_rs_gui/.cargo/config.toml

@@ -0,0 +1,6 @@
+# clipboard api is still unstable, so web-sys requires the below flag to be passed for copy (ctrl + c) to work
+# https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html
+# check status at https://developer.mozilla.org/en-US/docs/Web/API/Clipboard#browser_compatibility
+# we don't use `[build]` because of rust analyzer's build cache invalidation https://github.com/emilk/eframe_template/issues/93
+[target.wasm32-unknown-unknown]
+rustflags = ["--cfg=web_sys_unstable_apis"]

rpn_rs_gui/.github/workflows/pages.yml

@@ -0,0 +1,45 @@
+name: Github Pages
+
+# By default, runs if you push to master. keeps your deployed app in sync with master branch.
+on:
+  push:
+    branches:
+      - master
+# to only run when you do a new github release, comment out above part and uncomment the below trigger.
+# on:
+#   release:
+#     types:
+#       - published
+
+permissions:
+  contents: write # for committing to gh-pages branch.
+
+jobs:
+  build-github-pages:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2 # repo checkout
+      - uses: actions-rs/toolchain@v1 # get rust toolchain for wasm
+        with:
+          profile: minimal
+          toolchain: stable
+          target: wasm32-unknown-unknown
+          override: true
+      - name: Rust Cache # cache the rust build artefacts
+        uses: Swatinem/rust-cache@v1
+      - name: Download and install Trunk binary
+        run: wget -qO- https://github.com/thedodd/trunk/releases/latest/download/trunk-x86_64-unknown-linux-gnu.tar.gz | tar -xzf-
+      - name: Build # build
+        # "${GITHUB_REPOSITORY#*/}" evaluates into the name of the repository
+        # using --public-url something will allow trunk to modify all the href paths like from favicon.ico to repo_name/favicon.ico .
+        # this is necessary for github pages where the site is deployed to username.github.io/repo_name and all files must be requested
+        # relatively as eframe_template/favicon.ico. if we skip public-url option, the href paths will instead request username.github.io/favicon.ico which
+        # will obviously return error 404 not found.
+        run: ./trunk build --release --public-url "${GITHUB_REPOSITORY#*/}"
+      - name: Deploy
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          folder: dist
+          # this option will not maintain any history of your previous pages deployment
+          # set to false if you want all page build to be committed to your gh-pages branch history
+          single-commit: true

rpn_rs_gui/.github/workflows/rust.yml

@@ -0,0 +1,105 @@
+on: [push, pull_request]
+
+name: CI
+
+env:
+  # This is required to enable the web_sys clipboard API which egui_web uses
+  # https://rustwasm.github.io/wasm-bindgen/api/web_sys/struct.Clipboard.html
+  # https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html
+  RUSTFLAGS: --cfg=web_sys_unstable_apis
+
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --all-features
+
+  check_wasm:
+    name: Check wasm32
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          target: wasm32-unknown-unknown
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --all-features --lib --target wasm32-unknown-unknown
+
+  test:
+    name: Test Suite
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - run: sudo apt-get install libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libxkbcommon-dev libssl-dev
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --lib
+
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: clippy
+      - uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: -- -D warnings
+
+  trunk:
+    name: trunk
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: 1.65.0
+          target: wasm32-unknown-unknown
+          override: true
+      - name: Download and install Trunk binary
+        run: wget -qO- https://github.com/thedodd/trunk/releases/latest/download/trunk-x86_64-unknown-linux-gnu.tar.gz | tar -xzf-
+      - name: Build
+        run: ./trunk build

rpn_rs_gui/.gitignore

@@ -0,0 +1,2 @@
+/target
+/dist

rpn_rs_gui/Cargo.toml

@@ -0,0 +1,48 @@
+[package]
+name = "rpn_rs_gui"
+version = "0.1.0"
+authors = ["Austen Adler <agadler@austenadler.com>"]
+edition = "2021"
+rust-version = "1.65"
+
+
+[dependencies]
+rpn_rs = {path=".."}
+egui = "0.22.0"
+eframe = { version = "0.22.0", default-features = false, features = ["accesskit", "default_fonts", "glow", "persistence"] }
+
+# You only need serde if you want app persistence:
+serde = { version = "1", features = ["derive"] }
+tracing = "0.1.37"
+egui_extras = "0.22.0"
+
+# native:
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+tracing-subscriber = "0.3"
+
+# web:
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+console_error_panic_hook = "0.1.6"
+tracing-wasm = "0.2"
+wasm-bindgen = { version = "0.2.87" }
+wasm-bindgen-futures = "0.4"
+
+
+# TODO: This block was commented
+# [profile.release]
+# opt-level = 2 # fast and small wasm
+
+# # Optimize all dependencies even in debug builds:
+# [profile.dev.package."*"]
+# opt-level = 2
+
+# TODO: This block was commented
+# [patch.crates-io]
+
+# If you want to use the bleeding edge version of egui and eframe:
+# egui = { git = "https://github.com/emilk/egui", branch = "master" }
+# eframe = { git = "https://github.com/emilk/egui", branch = "master" }
+
+# If you fork https://github.com/emilk/egui you can test with:
+# egui = { path = "../egui/crates/egui" }
+# eframe = { path = "../egui/crates/eframe" }

rpn_rs_gui/README.md

@@ -0,0 +1,75 @@
+# eframe template
+
+[![dependency status](https://deps.rs/repo/github/emilk/eframe_template/status.svg)](https://deps.rs/repo/github/emilk/eframe_template)
+[![Build Status](https://github.com/emilk/eframe_template/workflows/CI/badge.svg)](https://github.com/emilk/eframe_template/actions?workflow=CI)
+
+This is a template repo for [eframe](https://github.com/emilk/egui/tree/master/crates/eframe), a framework for writing apps using [egui](https://github.com/emilk/egui/).
+
+The goal is for this to be the simplest way to get started writing a GUI app in Rust.
+
+You can compile your app natively or for the web, and share it using Github Pages.
+
+## Getting started
+
+Start by clicking "Use this template" at https://github.com/emilk/eframe_template/ or follow [these instructions](https://docs.github.com/en/free-pro-team@latest/github/creating-cloning-and-archiving-repositories/creating-a-repository-from-a-template).
+
+Change the name of the crate: Chose a good name for your project, and change the name to it in:
+* `Cargo.toml`
+    * Change the `package.name` from `eframe_template` to `your_crate`.
+    * Change the `package.authors`
+* `main.rs`
+    * Change `eframe_template::TemplateApp` to `your_crate::TemplateApp`
+* `index.html`
+    * Change the `<title>eframe template</title>` to `<title>your_crate</title>`. optional.
+* `assets/sw.js`
+  * Change the `'./eframe_template.js'` to `./your_crate.js` (in `filesToCache` array)
+  * Change the `'./eframe_template_bg.wasm'` to `./your_crate_bg.wasm` (in `filesToCache` array)
+
+### Learning about egui
+
+`src/app.rs` contains a simple example app. This is just to give some inspiration - most of it can be removed if you like.
+
+The official egui docs are at <https://docs.rs/egui>. If you prefer watching a video introduction, check out <https://www.youtube.com/watch?v=NtUkr_z7l84>. For inspiration, check out the [the egui web demo](https://emilk.github.io/egui/index.html) and follow the links in it to its source code.
+
+### Testing locally
+
+Make sure you are using the latest version of stable rust by running `rustup update`.
+
+`cargo run --release`
+
+On Linux you need to first run:
+
+`sudo apt-get install libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libxkbcommon-dev libssl-dev`
+
+On Fedora Rawhide you need to run:
+
+`dnf install clang clang-devel clang-tools-extra libxkbcommon-devel pkg-config openssl-devel libxcb-devel fontconfig-devel`
+
+### Web Locally
+
+You can compile your app to [WASM](https://en.wikipedia.org/wiki/WebAssembly) and publish it as a web page.
+
+We use [Trunk](https://trunkrs.dev/) to build for web target.
+1. Install Trunk with `cargo install --locked trunk`.
+2. Run `trunk serve` to build and serve on `http://127.0.0.1:8080`. Trunk will rebuild automatically if you edit the project.
+3. Open `http://127.0.0.1:8080/index.html#dev` in a browser. See the warning below.
+
+> `assets/sw.js` script will try to cache our app, and loads the cached version when it cannot connect to server allowing your app to work offline (like PWA).
+> appending `#dev` to `index.html` will skip this caching, allowing us to load the latest builds during development.
+
+### Web Deploy
+1. Just run `trunk build --release`.
+2. It will generate a `dist` directory as a "static html" website
+3. Upload the `dist` directory to any of the numerous free hosting websites including [GitHub Pages](https://docs.github.com/en/free-pro-team@latest/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site).
+4. we already provide a workflow that auto-deploys our app to GitHub pages if you enable it.
+> To enable Github Pages, you need to go to Repository -> Settings -> Pages -> Source -> set to `gh-pages` branch and `/` (root).
+>
+> If `gh-pages` is not available in `Source`, just create and push a branch called `gh-pages` and it should be available.
+
+You can test the template app at <https://emilk.github.io/eframe_template/>.
+
+## Updating egui
+
+As of 2022, egui is in active development with frequent releases with breaking changes. [eframe_template](https://github.com/emilk/eframe_template/) will be updated in lock-step to always use the latest version of egui.
+
+When updating `egui` and `eframe` it is recommended you do so one version at the time, and read about the changes in [the egui changelog](https://github.com/emilk/egui/blob/master/CHANGELOG.md) and [eframe changelog](https://github.com/emilk/egui/blob/master/crates/eframe/CHANGELOG.md).

rpn_rs_gui/Trunk.toml

@@ -0,0 +1,2 @@
+[build]
+filehash = false

rpn_rs_gui/assets/manifest.json

@@ -0,0 +1,28 @@
+{
+  "name": "egui Template PWA",
+  "short_name": "egui-template-pwa",
+  "icons": [
+    {
+      "src": "./icon-256.png",
+      "sizes": "256x256",
+      "type": "image/png"
+    },
+    {
+      "src": "./maskable_icon_x512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "./icon-1024.png",
+      "sizes": "1024x1024",
+      "type": "image/png"
+    }
+  ],
+  "lang": "en-US",
+  "id": "/index.html",
+  "start_url": "./index.html",
+  "display": "standalone",
+  "background_color": "white",
+  "theme_color": "white"
+}

rpn_rs_gui/assets/sw.js

@@ -0,0 +1,30 @@
+var cacheName = 'egui-template-pwa';
+var filesToCache = [
+  './',
+  './index.html',
+  './eframe_template.js',
+  './eframe_template_bg.wasm',
+];
+
+// self.addEventListener('keydown', function (e) {
+//     console.log("Got keydown", e);
+//     e.preventDefault();
+// })
+
+/* Start the service worker and cache all of the app's content */
+self.addEventListener('install', function (e) {
+  e.waitUntil(
+    caches.open(cacheName).then(function (cache) {
+      return cache.addAll(filesToCache);
+    })
+  );
+});
+
+/* Serve cached content when offline */
+self.addEventListener('fetch', function (e) {
+  e.respondWith(
+    caches.match(e.request).then(function (response) {
+      return response || fetch(e.request);
+    })
+  );
+});

rpn_rs_gui/check.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# This scripts runs various CI-like checks in a convenient way.
+set -eux
+
+cargo check --workspace --all-targets
+cargo check --workspace --all-features --lib --target wasm32-unknown-unknown
+cargo fmt --all -- --check
+cargo clippy --workspace --all-targets --all-features --  -D warnings -W clippy::all
+cargo test --workspace --all-targets --all-features
+cargo test --workspace --doc
+trunk build

rpn_rs_gui/index.html

@@ -0,0 +1,140 @@
+<!DOCTYPE html>
+<html>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+
+<!-- Disable zooming: -->
+<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
+
+<head>
+    <!-- change this to your project name -->
+    <title>RPN RS2</title>
+
+    <!-- config for our rust wasm binary. go to https://trunkrs.dev/assets/#rust for more customization -->
+    <link data-trunk rel="rust" data-wasm-opt="2" />
+    <!-- this is the base url relative to which other urls will be constructed. trunk will insert this from the public-url option -->
+    <base data-trunk-public-url />
+
+    <link data-trunk rel="icon" href="assets/favicon.ico">
+
+
+    <link data-trunk rel="copy-file" href="assets/sw.js" />
+    <link data-trunk rel="copy-file" href="assets/manifest.json" />
+    <link data-trunk rel="copy-file" href="assets/icon-1024.png" />
+    <link data-trunk rel="copy-file" href="assets/icon-256.png" />
+    <link data-trunk rel="copy-file" href="assets/icon_ios_touch_192.png" />
+    <link data-trunk rel="copy-file" href="assets/maskable_icon_x512.png" />
+
+
+    <link rel="manifest" href="manifest.json">
+    <link rel="apple-touch-icon" href="icon_ios_touch_192.png">
+    <meta name="theme-color" media="(prefers-color-scheme: light)" content="white">
+    <meta name="theme-color" media="(prefers-color-scheme: dark)" content="#404040">
+
+    <style>
+        html {
+            /* Remove touch delay: */
+            touch-action: manipulation;
+        }
+
+        body {
+            /* Light mode background color for what is not covered by the egui canvas,
+            or where the egui canvas is translucent. */
+            background: #909090;
+        }
+
+        @media (prefers-color-scheme: dark) {
+            body {
+                /* Dark mode background color for what is not covered by the egui canvas,
+                or where the egui canvas is translucent. */
+                background: #404040;
+            }
+        }
+
+        /* Allow canvas to fill entire web page: */
+        html,
+        body {
+            overflow: hidden;
+            margin: 0 !important;
+            padding: 0 !important;
+            height: 100%;
+            width: 100%;
+        }
+
+        /* Position canvas in center-top: */
+        canvas {
+            margin-right: auto;
+            margin-left: auto;
+            display: block;
+            position: absolute;
+            top: 0%;
+            left: 50%;
+            transform: translate(-50%, 0%);
+        }
+
+        .centered {
+            margin-right: auto;
+            margin-left: auto;
+            display: block;
+            position: absolute;
+            top: 50%;
+            left: 50%;
+            transform: translate(-50%, -50%);
+            color: #f0f0f0;
+            font-size: 24px;
+            font-family: Ubuntu-Light, Helvetica, sans-serif;
+            text-align: center;
+        }
+
+        /* ---------------------------------------------- */
+        /* Loading animation from https://loading.io/css/ */
+        .lds-dual-ring {
+            display: inline-block;
+            width: 24px;
+            height: 24px;
+        }
+
+        .lds-dual-ring:after {
+            content: " ";
+            display: block;
+            width: 24px;
+            height: 24px;
+            margin: 0px;
+            border-radius: 50%;
+            border: 3px solid #fff;
+            border-color: #fff transparent #fff transparent;
+            animation: lds-dual-ring 1.2s linear infinite;
+        }
+
+        @keyframes lds-dual-ring {
+            0% {
+                transform: rotate(0deg);
+            }
+
+            100% {
+                transform: rotate(360deg);
+            }
+        }
+
+    </style>
+</head>
+
+<body>
+    <!-- The WASM code will resize the canvas dynamically -->
+    <!-- the id is hardcoded in main.rs . so, make sure both match. -->
+    <canvas id="the_canvas_id"></canvas>
+
+    <!--Register Service Worker. this will cache the wasm / js scripts for offline use (for PWA functionality). -->
+    <!-- Force refresh (Ctrl + F5) to load the latest files instead of cached files  -->
+    <script>
+        // We disable caching during development so that we always view the latest version.
+        if ('serviceWorker' in navigator && window.location.hash !== "#dev") {
+            window.addEventListener('load', function () {
+                navigator.serviceWorker.register('sw.js');
+            });
+        }
+    </script>
+</body>
+
+</html>
+
+<!-- Powered by egui: https://github.com/emilk/egui/ -->

rpn_rs_gui/src/app.rs

@@ -0,0 +1,539 @@
+use std::collections::HashSet;
+
+use egui::{
+    Align, Button, Color32, Direction, FontData, FontDefinitions, FontFamily, FontId, Frame, Grid,
+    Id, Key, Label, Layout, Margin, PointerButton, Pos2, Rect, RichText, Rounding, ScrollArea,
+    Sense, Stroke, Style, TouchId, TouchPhase, Vec2,
+};
+use egui_extras::{Column, Size, StripBuilder, TableBuilder};
+use rpn_rs::calc::{
+    entries::CalculatorEntry,
+    errors::CalculatorError,
+    types::{CalculatorDisplayMode, CalculatorState},
+    Calculator,
+};
+use tracing::{error, info};
+mod buttons;
+use buttons::CalculatorButton;
+
+use self::buttons::{BUTTON_LAYOUT, BUTTON_LAYOUT_SETTINGS};
+
+const DEFAULT_FONT_SIZE: f32 = 45.0;
+const STACK_FONT_SIZE: f32 = 25.0;
+const DEFAULT_FONT: FontId = FontId::monospace(DEFAULT_FONT_SIZE);
+// const BUTTON_SIZE_WIDTH: Size = Size::remainder();
+// const BUTTON_SIZE_HEIGHT: Size = Size::remainder();
+// const BUTTON_SIZE: Vec2 = Vec2 { x: 67.0, y: 60.0 };
+const BUTTON_SPACING: Vec2 = Vec2 { x: 0.0, y: 0.0 };
+// const BUTTON_PADDING: Vec2 = Vec2 { x: 24.0, y: 5.0 };
+const BUTTON_PADDING: Vec2 = Vec2 { x: 0.0, y: 0.0 };
+
+/// We derive Deserialize/Serialize so we can persist app state on shutdown.
+#[derive(serde::Deserialize, serde::Serialize)]
+#[serde(default)]
+pub struct TemplateApp {
+    calculator: CalculatorInner,
+
+    #[serde(skip)]
+    latest_error: Option<CalculatorError>,
+
+    #[serde(skip)]
+    touches_down: HashSet<ClickTapId>,
+
+    #[serde(skip)]
+    new_touches: Vec<Pos2>,
+}
+
+#[derive(serde::Deserialize, serde::Serialize, Default)]
+#[serde(default)]
+pub struct CalculatorInner {
+    calculator: Calculator,
+
+    #[serde(skip)]
+    error_state: ErrorState,
+}
+
+impl CalculatorInner {
+    fn calculator_input(&mut self, c: char) {
+        let action = if c == '$' {
+            self.calculator.backspace()
+        } else {
+            self.calculator.take_input(c)
+        };
+
+        if let Err(e) = action {
+            self.error_state.errored(e);
+        } else {
+            self.error_state.success();
+        }
+    }
+}
+
+/// Phase of a click or tap
+#[derive(Debug, Clone, Copy)]
+enum ClickPhase {
+    Start,
+    End,
+    Ignored,
+}
+
+/// ID of a click or tap
+///
+/// Required because taps have IDs, but clicks don't
+#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
+enum ClickTapId {
+    Tap(u64),
+    Click(u8),
+}
+
+impl From<&TouchId> for ClickTapId {
+    fn from(value: &TouchId) -> Self {
+        Self::Tap(value.0)
+    }
+}
+
+impl From<&PointerButton> for ClickTapId {
+    fn from(value: &PointerButton) -> Self {
+        Self::Click(*value as u8)
+    }
+}
+
+impl From<&TouchPhase> for ClickPhase {
+    fn from(value: &TouchPhase) -> Self {
+        match value {
+            TouchPhase::Start => Self::Start,
+            TouchPhase::End => Self::End,
+            TouchPhase::Move | TouchPhase::Cancel => Self::Ignored,
+        }
+    }
+}
+
+impl Default for TemplateApp {
+    fn default() -> Self {
+        Self {
+            calculator: CalculatorInner::default(),
+            latest_error: None,
+            touches_down: HashSet::new(),
+            new_touches: Vec::new(),
+        }
+    }
+}
+
+impl TemplateApp {
+    /// Called once before the first frame.
+    pub fn new(cc: &eframe::CreationContext<'_>) -> Self {
+        // This is also where you can customize the look and feel of egui using
+        // `cc.egui_ctx.set_visuals` and `cc.egui_ctx.set_fonts`.
+
+        // Load previous app state (if any).
+        // Note that you must enable the `persistence` feature for this to work.
+        let ret;
+        if let Some(storage) = cc.storage {
+            ret = eframe::get_value(storage, eframe::APP_KEY).unwrap_or_default();
+        } else {
+            ret = Default::default()
+        }
+
+        TemplateApp::initialize_fonts(&cc.egui_ctx);
+
+        ret
+    }
+
+    fn draw_stack(&mut self, ui: &mut egui::Ui) {
+        TableBuilder::new(ui)
+            .stick_to_bottom(true)
+            // .column(Column::auto() )
+            .column(Column::remainder())
+            // .header(20.0, |mut header| {
+            //     header.col(|ui| {
+            //         ui.heading("Entry");
+            //     });
+            //     header.col(|ui| {
+            //         ui.heading("Value");
+            //     });
+            // })
+            .body(|mut body| {
+                for (_idx, entry) in self.calculator.calculator.stack.iter().enumerate().rev() {
+                    body.row(30.0, |mut row| {
+                        // row.col(|ui| {
+                        //     ui.add(Label::new(
+                        //         RichText::new(format!("{idx}"))
+                        //             .background_color(Color32::RED)
+                        //             .font(DEFAULT_FONT)
+                        //             .size(STACK_FONT_SIZE)
+                        //             .color(Color32::WHITE)
+                        //     ));
+                        // });
+                        row.col(|ui| {
+                            ui.add(Label::new(
+                                RichText::new(
+                                    entry.format_entry(&self.calculator.calculator.display_mode),
+                                )
+                                .background_color(Color32::DARK_GRAY)
+                                .font(DEFAULT_FONT)
+                                .size(STACK_FONT_SIZE)
+                                .color(Color32::WHITE),
+                            ));
+                        });
+                    });
+                }
+            });
+    }
+
+    fn draw_error(&mut self, ui: &mut egui::Ui) {
+        if let Some(ref e) = self.latest_error {
+            ui.label(
+                RichText::new(e.to_string())
+                    .font(DEFAULT_FONT)
+                    .size(STACK_FONT_SIZE)
+                    .background_color(Color32::RED)
+                    .color(Color32::WHITE),
+            );
+        }
+    }
+
+    fn draw_input(&mut self, ui: &mut egui::Ui) {
+        ui.painter()
+            .rect_filled(ui.available_rect_before_wrap(), 0.0, Color32::LIGHT_GREEN);
+        ui.label(
+            RichText::new(self.calculator.calculator.get_l())
+                .color(Color32::BLACK)
+                .font(FontId::monospace(30.0)),
+        );
+    }
+
+    fn draw_buttons(&mut self, ui: &mut egui::Ui) {
+        let button_layout = match self.calculator.calculator.state {
+            CalculatorState::Normal => BUTTON_LAYOUT,
+            CalculatorState::WaitingForConstant => return,
+            CalculatorState::WaitingForMacro => return,
+            CalculatorState::WaitingForRegister(_) => return,
+            CalculatorState::WaitingForSetting => BUTTON_LAYOUT_SETTINGS,
+        };
+
+        StripBuilder::new(ui)
+            .sizes(Size::exact(60.0), button_layout.len())
+            // .sizes(Size::remainder(), button_layout.len())
+            .vertical(|mut strip| {
+                for row in button_layout.iter() {
+                    strip.strip(|builder| {
+                        builder
+                            .sizes(Size::remainder(), row.len())
+                            .horizontal(|mut strip| {
+                                for button_definition in row.iter() {
+                                    strip.cell(|ui| {
+                                        let sense = Sense::click();
+
+                                        let label = RichText::new(button_definition.value)
+                                            .font(DEFAULT_FONT)
+                                            .color(Color32::WHITE)
+                                            .background_color(Color32::BLACK);
+
+                                        ui.painter().rect_filled(
+                                            ui.available_rect_before_wrap(),
+                                            0.0,
+                                            Color32::GOLD,
+                                        );
+                                        ui.style_mut().spacing.window_margin = Margin {
+                                            left: 0.0,
+                                            right: 0.0,
+                                            top: 0.0,
+                                            bottom: 0.0,
+                                        };
+
+                                        let max_size = {
+                                            let ret = ui.available_rect_before_wrap();
+                                            Vec2 {
+                                                x: ret.width(),
+                                                y: ret.height(),
+                                            }
+                                        };
+
+                                        ui.vertical_centered(|ui| {
+                                            ui.add_enabled(
+                                                button_definition.enabled,
+                                                Button::new(label)
+                                                    .stroke(Stroke::NONE)
+                                                    .rounding(Rounding::none())
+                                                    .fill(Color32::from_gray(0x12))
+                                                    .min_size(max_size)
+                                                    .sense(sense),
+                                            )
+                                        });
+
+                                        // let button = {
+                                        //     let ret = ui.add_enabled(
+                                        //         button_definition.enabled,
+                                        //         Button::new(label)
+                                        //             .stroke(Stroke::NONE)
+                                        //             .rounding(Rounding::none())
+                                        //             .fill(Color32::from_gray(0x12))
+                                        //             .min_size(max_size)
+                                        //             .sense(sense),
+                                        //     );
+
+                                        //     ret
+                                        // };
+
+                                        // Check if any new touches intersect with this button
+                                        let max_rect = ui.max_rect();
+                                        for touch in self.new_touches.iter() {
+                                            if max_rect.contains(*touch) {
+                                                self.calculator
+                                                    .calculator_input(button_definition.value);
+                                            }
+                                        }
+                                    });
+                                }
+                            });
+                    });
+                }
+            });
+    }
+
+    fn layout() -> Layout {
+        Layout::from_main_dir_and_cross_align(Direction::TopDown, Align::Center)
+            .with_cross_justify(true)
+    }
+
+    fn handle_input(&mut self, i: &egui::InputState) {
+        if i.events.is_empty() {
+            return;
+        }
+
+        for e in i.events.iter() {
+            match e {
+                egui::Event::Text(t) => {
+                    self.calculator.calculator_input(t.chars().next().unwrap());
+                }
+                // egui::Event::Key {
+                //     key: Key::ArrowLeft,
+                //     pressed: true,
+                //     ..
+                // } => {
+                //     self.calculator.calculator_input('<');
+                // }
+                egui::Event::Key {
+                    key: Key::ArrowRight,
+                    pressed: true,
+                    ..
+                } => {
+                    self.calculator.calculator_input('>');
+                }
+                egui::Event::Key {
+                    key: Key::Enter,
+                    pressed: true,
+                    ..
+                } => {
+                    self.calculator.calculator_input(' ');
+                }
+                egui::Event::Touch {
+                    device_id: _,
+                    id,
+                    phase,
+                    pos,
+                    force: _,
+                } => {
+                    self.handle_touch_event(phase.into(), pos.clone(), id);
+                }
+                egui::Event::PointerButton {
+                    pos,
+                    button,
+                    pressed,
+                    modifiers: _,
+                } => self.handle_touch_event(
+                    if *pressed {
+                        ClickPhase::Start
+                    } else {
+                        ClickPhase::End
+                    },
+                    *pos,
+                    button,
+                ),
+
+                egui::Event::Copy
+                | egui::Event::Cut
+                | egui::Event::Paste(_)
+                | egui::Event::Key {
+                    key: _,
+                    pressed: _,
+                    repeat: _,
+                    modifiers: _,
+                }
+                | egui::Event::PointerMoved(_)
+                | egui::Event::PointerGone
+                | egui::Event::Scroll(_)
+                | egui::Event::Zoom(_)
+                | egui::Event::CompositionStart
+                | egui::Event::CompositionUpdate(_)
+                | egui::Event::CompositionEnd(_)
+                | egui::Event::AccessKitActionRequest(_)
+                | egui::Event::MouseWheel {
+                    unit: _,
+                    delta: _,
+                    modifiers: _,
+                }
+                | egui::Event::WindowFocused(_) => continue,
+            }
+        }
+    }
+
+    fn handle_touch_event(&mut self, phase: ClickPhase, pos: Pos2, id: impl Into<ClickTapId>) {
+        let id = id.into();
+        match phase {
+            ClickPhase::Start => {
+                // TODO: This can be way better
+
+                // If this is a brand new touch
+                if !self.touches_down.contains(&id)
+                    // And it isn't a duplicate
+                    // This can occur on phones where touches can be pointer events
+                    && !self.new_touches.contains(&pos)
+                {
+                    self.new_touches.push(pos);
+                }
+                self.touches_down.insert(id);
+            }
+            ClickPhase::End => {
+                self.touches_down.remove(&id);
+            }
+            ClickPhase::Ignored => {}
+        }
+    }
+
+    fn initialize_fonts(egui_ctx: &egui::Context) {
+        info!("Initializing fonts");
+        let mut fonts = FontDefinitions::default();
+
+        fonts.font_data.insert(
+            "LCD_Solid".to_owned(),
+            FontData::from_static(include_bytes!("../LcdSolid-VPzB.ttf")),
+        );
+
+        fonts
+            .families
+            .get_mut(&FontFamily::Monospace)
+            .unwrap()
+            .insert(0, "LCD_Solid".to_owned());
+
+        fonts
+            .families
+            .get_mut(&FontFamily::Monospace)
+            .unwrap()
+            .push("LCD_Solid".to_owned());
+
+        egui_ctx.set_fonts(fonts);
+    }
+}
+
+impl eframe::App for TemplateApp {
+    /// Called by the frame work to save state before shutdown.
+    fn save(&mut self, storage: &mut dyn eframe::Storage) {
+        eframe::set_value(storage, eframe::APP_KEY, self);
+    }
+
+    /// Called each time the UI needs repainting, which may be many times per second.
+    /// Put your widgets into a `SidePanel`, `TopPanel`, `CentralPanel`, `Window` or `Area`.
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        let Self { .. } = self;
+
+        let mut style: Style = (*ctx.style()).clone();
+        style.spacing.button_padding = BUTTON_PADDING;
+        ctx.set_style(style);
+
+        self.calculator.error_state = ErrorState::default();
+
+        egui::CentralPanel::default().show(ctx, |ui| {
+            // ui.with_layout(self.layout, add_contents)
+            ui.input(|i: &egui::InputState| self.handle_input(i));
+
+            StripBuilder::new(ui)
+                // header
+                .size(Size::exact(65.0))
+                // Stack
+                // .size(Size::remainder().at_most(35.0))
+                .size(Size::remainder().at_least(40.0))
+                // Input
+                .size(Size::exact(40.0))
+                // Error
+                .size(Size::exact(20.0))
+                // Buttons
+                .size(Size::exact(450.0))
+                .vertical(|mut strip| {
+                    strip.cell(|ui| {
+                        ui.heading("rpn_rs_gui");
+                        ui.hyperlink("https://gitea.austen-wares.com/stonewareslord/rpn_rs");
+                    });
+                    strip.cell(|ui| {
+                        // Stack
+                        ui.painter().rect_filled(
+                            ui.available_rect_before_wrap(),
+                            0.0,
+                            Color32::LIGHT_GRAY,
+                        );
+                        self.draw_stack(ui);
+                    });
+                    strip.cell(|ui| {
+                        self.draw_input(ui);
+                        // Reset the error state and update `self.latest_error` if required
+                        match std::mem::take(&mut self.calculator.error_state) {
+                            ErrorState::NoModify => {}
+                            ErrorState::Errored(e) => self.latest_error = Some(e),
+                            ErrorState::Clear => self.latest_error = None,
+                        }
+                    });
+                    strip.cell(|ui| {
+                        // Error bar
+                        self.draw_error(ui);
+                    });
+                    strip.cell(|ui| {
+                        // Buttons
+                        self.draw_buttons(ui);
+                    });
+                })
+        });
+
+        self.new_touches.drain(..);
+    }
+}
+
+enum ErrorState {
+    // Do not touch the state of the error
+    NoModify,
+    // There was an error; this was the latest value
+    Errored(CalculatorError),
+    // We should clear the error at the end
+    Clear,
+}
+
+impl ErrorState {
+    fn errored(&mut self, e: CalculatorError) {
+        error!("Calculator input error: {e:?}");
+
+        match self {
+            Self::NoModify | ErrorState::Clear => *self = Self::Errored(e),
+            Self::Errored(_) => {
+                // We already errored, so do not change anything
+            }
+        }
+    }
+    fn success(&mut self) {
+        match self {
+            Self::NoModify => {
+                // There was a success and there was no previous failure, so clear any error value
+                *self = Self::Clear
+            }
+            Self::Errored(_) => {
+                // There was a previous error. We can't clear the error
+            }
+            Self::Clear => {
+                // The calculator error was already removed
+            }
+        }
+    }
+}
+impl Default for ErrorState {
+    fn default() -> ErrorState {
+        ErrorState::NoModify
+    }
+}

rpn_rs_gui/src/app/buttons.rs

@@ -0,0 +1,108 @@
+use rpn_rs::calc::Calculator;
+
+pub struct CalculatorButton {
+    pub value: char,
+    pub help: Option<&'static str>,
+    pub enabled: bool,
+}
+
+impl CalculatorButton {
+    const fn new(value: char, help: Option<&'static str>, enabled: bool) -> Self {
+        Self {
+            value,
+            help,
+            enabled,
+        }
+    }
+}
+
+pub(crate) const BUTTON_LAYOUT_SETTINGS: &[&[CalculatorButton]] = &[
+    &[CalculatorButton::new('q', Some("Exit"), true)],
+    &[
+        CalculatorButton::new('d', Some("Degrees"), true),
+        CalculatorButton::new('r', Some("Radians"), true),
+        CalculatorButton::new('g', Some("Grads"), true),
+    ],
+    &[
+        CalculatorButton::new('_', Some("Default"), true),
+        CalculatorButton::new(',', Some("Comma separated"), true),
+        CalculatorButton::new(' ', Some("Space separated"), true),
+    ],
+    &[
+        CalculatorButton::new('s', Some("Scientific"), true),
+        CalculatorButton::new('S', Some("Scientific (stack precision)"), true),
+    ],
+    &[
+        CalculatorButton::new('e', Some("Engineering"), true),
+        CalculatorButton::new('E', Some("Engineering (stack precision)"), true),
+    ],
+    &[
+        CalculatorButton::new('f', Some("Fixed"), true),
+        CalculatorButton::new('F', Some("Fixed (stack precision)"), true),
+    ],
+    // CalculatorButton::new('w', Some("Do not write settings and stack on quit (default)"), true),
+    // CalculatorButton::new('W', Some("Write stack and settings on quit"), true),
+    // CalculatorButton::new('L', Some("Left align"), true),
+    // CalculatorButton::new('R', Some("Right align"), true),
+];
+
+pub(crate) const BUTTON_LAYOUT: &[&[CalculatorButton]] = &[
+    &[
+        // CalculatorButton::new('s', "Sin", true),
+        CalculatorButton::new('\\', Some("Drop"), true),
+        // TODO: Settings buttons
+        CalculatorButton::new('@', Some("Settings"), true),
+        // CalculatorButton::new(' ', Some("Enter"), true),
+        CalculatorButton::new('>', Some("Swap"), true),
+        CalculatorButton::new('$', Some("Backspace"), true),
+    ],
+    &[
+        // CalculatorButton::new('|', "AbsoluteValue", true),
+        CalculatorButton::new('^', Some("Pow"), true),
+        CalculatorButton::new('U', Some("Redo"), true),
+        CalculatorButton::new('u', Some("Undo"), true),
+        CalculatorButton::new('L', Some("Ln"), true),
+        // CalculatorButton::new('l', Some("Log"), true),
+    ],
+    &[
+        // CalculatorButton::new('c', "Cos", true),
+        CalculatorButton::new('v', Some("Sqrt"), true),
+        // CalculatorButton::new('%', Some("Modulo"), true),
+        CalculatorButton::new('n', Some("Negate"), true),
+        CalculatorButton::new('i', Some("Inverse"), true),
+        CalculatorButton::new('/', Some("Divide"), true),
+    ],
+    &[
+        // CalculatorButton::new('t', "Tan", true),
+        CalculatorButton::new('7', None, true),
+        CalculatorButton::new('8', None, true),
+        CalculatorButton::new('9', None, true),
+        CalculatorButton::new('*', Some("Multiply"), true),
+    ],
+    &[
+        // CalculatorButton::new('S', "ASin", true),
+        CalculatorButton::new('4', None, true),
+        CalculatorButton::new('5', None, true),
+        CalculatorButton::new('6', None, true),
+        CalculatorButton::new('-', Some("Subtract"), true),
+    ],
+    &[
+        // CalculatorButton::new('C', "ACos", true),
+        CalculatorButton::new('1', None, true),
+        CalculatorButton::new('2', None, true),
+        CalculatorButton::new('3', None, true),
+        CalculatorButton::new('+', Some("Add"), true),
+    ],
+    &[
+        // CalculatorButton::new('T', "ATan", true),
+        CalculatorButton::new('0', None, true),
+        CalculatorButton::new('.', Some("Decimal"), true),
+        CalculatorButton::new(' ', Some("Return"), true),
+        CalculatorButton::new(' ', Some("Return"), true),
+    ],
+    // CalculatorButton::new ( '?',  "IntegerDivide", true),
+    // CalculatorButton::new ( 'V',  "BuildVector", true),
+    // CalculatorButton::new ( 'M',  "BuildMatrix", true),
+    // CalculatorButton::new ( '_',  "Deconstruct", true),
+    // CalculatorButton::new ( ', true)',  "Transpose"),
+];

rpn_rs_gui/src/lib.rs

@@ -0,0 +1,4 @@
+#![warn(clippy::all, rust_2018_idioms)]
+
+mod app;
+pub use app::TemplateApp;

rpn_rs_gui/src/main.rs

@@ -0,0 +1,39 @@
+#![warn(clippy::all, rust_2018_idioms)]
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+
+// When compiling natively:
+#[cfg(not(target_arch = "wasm32"))]
+fn main() -> eframe::Result<()> {
+    // Log to stdout (if you run with `RUST_LOG=debug`).
+    tracing_subscriber::fmt::init();
+
+    let native_options = eframe::NativeOptions::default();
+    eframe::run_native(
+        "RPN RS2",
+        native_options,
+        Box::new(|cc| Box::new(rpn_rs_gui::TemplateApp::new(cc))),
+    )
+}
+
+// when compiling to web using trunk.
+#[cfg(target_arch = "wasm32")]
+fn main() {
+    // Make sure panics are logged using `console.error`.
+    console_error_panic_hook::set_once();
+
+    // Redirect tracing to console.log and friends:
+    tracing_wasm::set_as_global_default();
+
+    let web_options = eframe::WebOptions::default();
+
+    wasm_bindgen_futures::spawn_local(async {
+        eframe::WebRunner::new()
+            .start(
+                "the_canvas_id", // hardcode it
+                web_options,
+                Box::new(|cc| Box::new(rpn_rs_gui::TemplateApp::new(cc))),
+            )
+            .await
+            .expect("failed to start eframe");
+    });
+}

rpn_rs_tui/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "rpn_rs_tui"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rpn_rs = {path=".."}
+crossterm = { version = "0.18" }
+tui = { version = "0.14", default-features = false, features = ["crossterm"] }
+tracing-appender = "0.2.2"
+tracing-subscriber = "0.3.17"
+tracing = "0.1.37"

rpn_rs_tui/src/main.rs

@@ -5,8 +5,9 @@
 // Cannot fix this, so don't warn me about it
 #![allow(clippy::multiple_crate_versions)]
 
-mod calc;
+use rpn_rs::{calc, constants};
 mod event;
+use tracing::info;
 
 const BORDER_SIZE: u16 = 2;
 const HELP_TEXT: &str = "\
@@ -61,7 +62,7 @@ use crossterm::{
 use event::{Event, Events};
 // use io::stdout;
 
-use std::{cmp, convert::TryFrom, error::Error, io, io::Write};
+use std::{cmp, convert::TryFrom, error::Error, fs::OpenOptions, io, io::Write};
 use tui::{
     backend::CrosstermBackend,
     layout::{Constraint, Direction, Layout, Rect},
@@ -308,7 +309,36 @@ impl App {
     }
 }
 
+fn init_logging() {
+    use tracing_subscriber::{filter::LevelFilter, fmt, prelude::*, EnvFilter};
+
+    let file = OpenOptions::new()
+        .create(true)
+        .append(true)
+        .open("/tmp/rpn_rs.log")
+        .unwrap();
+    let (non_blocking_file, _guard) = tracing_appender::non_blocking(file);
+
+    tracing_subscriber::registry()
+        .with(fmt::layer().with_writer(non_blocking_file))
+        // .with(fmt::layer().with_writer(io::stderr))
+        .with(
+            EnvFilter::builder()
+                .with_default_directive(LevelFilter::ERROR.into())
+                .with_env_var("RPN_RS_LOG")
+                .from_env()
+                .unwrap(),
+        )
+        .init();
+
+    info!("Logging initialized");
+}
+
 fn main() -> Result<(), Box<dyn Error>> {
+    if std::env::var("ENABLE_LOGGING").as_ref().map(String::as_str) == Ok("1") {
+        init_logging();
+    }
+
     enable_raw_mode()?;
 
     let mut stdout = io::stdout();
@@ -380,6 +410,10 @@ fn handle_key(app: &mut App, key: KeyEvent) -> CalculatorResult<CalculatorRespon
                 code: KeyCode::Enter,
                 modifiers: KeyModifiers::NONE,
             }
+            | KeyEvent {
+                code: KeyCode::Char('j'),
+                modifiers: KeyModifiers::CONTROL,
+            }
             | KeyEvent {
                 code: KeyCode::Char(' '),
                 modifiers: KeyModifiers::NONE,
@@ -418,7 +452,7 @@ fn handle_key(app: &mut App, key: KeyEvent) -> CalculatorResult<CalculatorRespon
                     app.calculator.take_input(c)?;
                 }
             }
-            _ => {}
+            _key_event => {}
         },
         (AppState::Help, _) => match key {
             KeyEvent {

src/calc.rs

@@ -1,9 +1,12 @@
+use rust_decimal::prelude::ToPrimitive;
 pub mod entries;
+use crate::constants;
 use lazy_static::lazy_static;
 pub mod errors;
 pub mod operations;
 pub mod types;
 use crate::calc::entries::CalculatorEntry;
+use rust_decimal::Decimal;
 
 use confy::{load, store};
 use entries::{Entry, Matrix, Number, Vector};
@@ -197,7 +200,7 @@ impl Default for Calculator {
                     CalculatorConstant {
                         help: String::from("Tau (2pi)"),
                         value: Entry::Number(Number {
-                            value: std::f64::consts::TAU,
+                            value: constants::TAU,
                         }),
                     },
                 ),
@@ -206,7 +209,7 @@ impl Default for Calculator {
                     CalculatorConstant {
                         help: String::from("Euler's Number e"),
                         value: Entry::Number(Number {
-                            value: std::f64::consts::E,
+                            value: constants::E,
                         }),
                     },
                 ),
@@ -215,7 +218,7 @@ impl Default for Calculator {
                     CalculatorConstant {
                         help: String::from("Pi"),
                         value: Entry::Number(Number {
-                            value: std::f64::consts::PI,
+                            value: constants::PI,
                         }),
                     },
                 ),
@@ -479,7 +482,10 @@ impl Calculator {
             return Ok(false);
         }
 
-        let f = self.l.parse::<f64>().or(Err(CalculatorError::ParseError))?;
+        let f = self
+            .l
+            .parse::<Decimal>()
+            .or(Err(CalculatorError::ParseError))?;
         self.push(Entry::Number(Number { value: f }))?;
         self.l.clear();
         Ok(true)
@@ -520,14 +526,11 @@ impl Calculator {
             Entry::Matrix(_) | Entry::Vector(_) => return Err(CalculatorError::TypeMismatch),
             Entry::Number(Number { value }) => value,
         };
-        // Ensure this can be cast to a usize
-        if !f.is_finite() || f.is_sign_negative() {
-            return Err(CalculatorError::ArithmeticError);
-        }
-        #[allow(clippy::cast_sign_loss)]
-        let u = f as usize;
 
-        Ok((u, entry))
+        match f.to_usize() {
+            Some(u) => Ok((u, entry)),
+            None => Err(CalculatorError::ArithmeticError),
+        }
     }
     /// Pops a precision instead of an Entry. Precisions are of type usize
     pub fn pop_precision(&mut self) -> CalculatorResult<usize> {

src/calc/entries.rs

@@ -255,6 +255,8 @@ impl fmt::Display for Entry {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use rust_decimal::Decimal;
+    use rust_decimal_macros::dec;
 
     fn valid_square_matrix() -> Entry {
         Entry::Matrix(Matrix {
@@ -266,25 +268,25 @@ mod tests {
                 Vector {
                     direction: VectorDirection::Column,
                     values: vec![
-                        Number { value: 1.0_f64 },
-                        Number { value: 2.0_f64 },
-                        Number { value: -3.0_f64 },
+                        Number { value: dec!(1.0) },
+                        Number { value: dec!(2.0) },
+                        Number { value: dec!(-3.0) },
                     ],
                 },
                 Vector {
                     direction: VectorDirection::Column,
                     values: vec![
-                        Number { value: 4.0_f64 },
-                        Number { value: -5.0_f64 },
-                        Number { value: 0.0_f64 },
+                        Number { value: dec!(4.0) },
+                        Number { value: dec!(-5.0) },
+                        Number { value: dec!(0.0) },
                     ],
                 },
                 Vector {
                     direction: VectorDirection::Column,
                     values: vec![
-                        Number { value: -7.0_f64 },
-                        Number { value: 8.0_f64 },
-                        Number { value: 9.0_f64 },
+                        Number { value: dec!(-7.0) },
+                        Number { value: dec!(8.0) },
+                        Number { value: dec!(9.0) },
                     ],
                 },
             ],
@@ -301,25 +303,25 @@ mod tests {
                     Entry::Vector(Vector {
                         direction: VectorDirection::Column,
                         values: vec![
-                            Number { value: -1.0_f64 },
-                            Number { value: -2.0_f64 },
-                            Number { value: 3.0_f64 },
+                            Number { value: dec!(-1.0) },
+                            Number { value: dec!(-2.0) },
+                            Number { value: dec!(3.0) },
                         ],
                     }),
                     Entry::Vector(Vector {
                         direction: VectorDirection::Column,
                         values: vec![
-                            Number { value: -4.0_f64 },
-                            Number { value: 5.0_f64 },
-                            Number { value: -0.0_f64 },
+                            Number { value: dec!(-4.0) },
+                            Number { value: dec!(5.0) },
+                            Number { value: dec!(-0.0) },
                         ],
                     }),
                     Entry::Vector(Vector {
                         direction: VectorDirection::Column,
                         values: vec![
-                            Number { value: 7.0_f64 },
-                            Number { value: -8.0_f64 },
-                            Number { value: -9.0_f64 },
+                            Number { value: dec!(7.0) },
+                            Number { value: dec!(-8.0) },
+                            Number { value: dec!(-9.0) },
                         ],
                     }),
                 ]),
@@ -331,25 +333,25 @@ mod tests {
             //         Entry::Vector(Vector {
             //             direction: VectorDirection::Column,
             //             values: vec![
-            //                 Number { value: 1.0_f64 },
-            //                 Number { value: 2.0_f64 },
-            //                 Number { value: 3.0_f64 },
+            //                 Number { value: dec!(1.0) },
+            //                 Number { value: dec!(2.0) },
+            //                 Number { value: dec!(3.0) },
             //             ],
             //         }),
             //         Entry::Vector(Vector {
             //             direction: VectorDirection::Column,
             //             values: vec![
-            //                 Number { value: 4.0_f64 },
-            //                 Number { value: 5.0_f64 },
-            //                 Number { value: 0.0_f64 },
+            //                 Number { value: dec!(4.0) },
+            //                 Number { value: dec!(5.0) },
+            //                 Number { value: dec!(0.0) },
             //             ],
             //         }),
             //         Entry::Vector(Vector {
             //             direction: VectorDirection::Column,
             //             values: vec![
-            //                 Number { value: 7.0_f64 },
-            //                 Number { value: 8.0_f64 },
-            //                 Number { value: 9.0_f64 },
+            //                 Number { value: dec!(7.0) },
+            //                 Number { value: dec!(8.0) },
+            //                 Number { value: dec!(9.0) },
             //             ],
             //         }),
             //     ]),
@@ -358,23 +360,23 @@ mod tests {
             //     Entry::Vector(Vector {
             //         direction: VectorDirection::Column,
             //         values: vec![
-            //         Number{value: 1.0_f64},
-            //         Number{value: 2.0_f64},
-            //         Number{value: -3.0_f64},
+            //         Number{value: dec!(1.0},)
+            //         Number{value: dec!(2.0},)
+            //         Number{value: dec!(-3.0},)
             //         ]}),
             //         Entry::Vector (Vector{
             //             direction: VectorDirection::Column,
             //         values: vec![
-            //         Number{value: 4.0_f64},
-            //         Number{value: -5.0_f64},
-            //         Number{value: 0.0_f64},
+            //         Number{value: dec!(4.0},)
+            //         Number{value: dec!(-5.0},)
+            //         Number{value: dec!(0.0},)
             //         ]}),
             //         Entry::Vector (Vector{
             //             direction: VectorDirection::Column,
             //         values: vec![
-            //         Number{value: -7.0_f64},
-            //         Number{value: 8.0_f64},
-            //         Number{value: 9.0_f64},
+            //         Number{value: dec!(-7.0},)
+            //         Number{value: dec!(8.0},)
+            //         Number{value: dec!(9.0},)
             //         ])),
             (
                 "transpose",
@@ -383,25 +385,25 @@ mod tests {
                     Entry::Vector(Vector {
                         direction: VectorDirection::Column,
                         values: vec![
-                            Number { value: 1.0_f64 },
-                            Number { value: 4.0_f64 },
-                            Number { value: -7.0_f64 },
+                            Number { value: dec!(1.0) },
+                            Number { value: dec!(4.0) },
+                            Number { value: dec!(-7.0) },
                         ],
                     }),
                     Entry::Vector(Vector {
                         direction: VectorDirection::Column,
                         values: vec![
-                            Number { value: 2.0_f64 },
-                            Number { value: -5.0_f64 },
-                            Number { value: 8.0_f64 },
+                            Number { value: dec!(2.0) },
+                            Number { value: dec!(-5.0) },
+                            Number { value: dec!(8.0) },
                         ],
                     }),
                     Entry::Vector(Vector {
                         direction: VectorDirection::Column,
                         values: vec![
-                            Number { value: -3.0_f64 },
-                            Number { value: 0.0_f64 },
-                            Number { value: 9.0_f64 },
+                            Number { value: dec!(-3.0) },
+                            Number { value: dec!(0.0) },
+                            Number { value: dec!(9.0) },
                         ],
                     }),
                 ]),
@@ -416,9 +418,9 @@ mod tests {
                     vectors: vec![Vector {
                         direction: VectorDirection::Column,
                         values: vec![
-                            Number { value: 1.0_f64 },
-                            Number { value: 100.0_f64 },
-                            Number { value: 64.0_f64 },
+                            Number { value: dec!(1.0) },
+                            Number { value: dec!(100.0) },
+                            Number { value: dec!(64.0) },
                         ],
                     }],
                 })
@@ -426,9 +428,9 @@ mod tests {
                 Matrix::from(&[Entry::Vector(Vector {
                     direction: VectorDirection::Column,
                     values: vec![
-                        Number { value: 1.0_f64 },
-                        Number { value: 10.0_f64 },
-                        Number { value: 8.0_f64 },
+                        Number { value: dec!(1.0) },
+                        Number { value: dec!(10.0) },
+                        Number { value: dec!(8.0) },
                     ],
                 })]),
             ),
@@ -443,10 +445,10 @@ mod tests {
                     vectors: vec![Vector {
                         direction: VectorDirection::Column,
                         values: vec![
-                            Number { value: 1.0_f64 },
-                            Number { value: 100.0_f64 },
+                            Number { value: dec!(1.0) },
+                            Number { value: dec!(100.0) },
                             Number {
-                                value: 100_000.0_f64,
+                                value: dec!(100_000.0),
                             },
                         ],
                     }],
@@ -455,9 +457,9 @@ mod tests {
                 Matrix::from(&[Entry::Vector(Vector {
                     direction: VectorDirection::Column,
                     values: vec![
-                        Number { value: 0.0_f64 },
-                        Number { value: 2.0_f64 },
-                        Number { value: 5.0_f64 },
+                        Number { value: dec!(0.0) },
+                        Number { value: dec!(2.0) },
+                        Number { value: dec!(5.0) },
                     ],
                 })]),
             ),
@@ -471,9 +473,9 @@ mod tests {
                     vectors: vec![Vector {
                         direction: VectorDirection::Column,
                         values: vec![
-                            Number { value: 1.0_f64 },
+                            Number { value: dec!(1.0) },
                             Number {
-                                value: std::f64::consts::E,
+                                value: constants::E,
                             },
                         ],
                     }],
@@ -481,7 +483,7 @@ mod tests {
                 .ln(),
                 Matrix::from(&[Entry::Vector(Vector {
                     direction: VectorDirection::Column,
-                    values: vec![Number { value: 0.0_f64 }, Number { value: 1.0_f64 }],
+                    values: vec![Number { value: dec!(0.0) }, Number { value: dec!(1.0) }],
                 })]),
             ),
         ] {

src/calc/entries/matrix.rs

@@ -1,11 +1,8 @@
 use super::{Entry, Number, Vector, VectorDirection};
-use crate::{
-    calc::{
+use crate::calc::{
+    entries::CalculatorEntry,
     errors::{CalculatorError, CalculatorResult},
-        types::CalculatorAngleMode,
-        CalculatorDisplayMode,
-    },
-    CalculatorEntry,
+    types::{CalculatorAngleMode, CalculatorDisplayMode},
 };
 use serde::{Deserialize, Serialize};
 use std::fmt;

src/calc/entries/number.rs

@@ -1,37 +1,27 @@
 use super::{Entry, Matrix, Vector};
 use crate::{
     calc::{
+        entries::CalculatorEntry,
         errors::{CalculatorError, CalculatorResult},
-        types::CalculatorAngleMode,
-        CalculatorDisplayMode,
+        types::{CalculatorAngleMode, CalculatorDisplayMode},
     },
-    CalculatorEntry,
+    constants,
 };
+use rust_decimal::{Decimal, MathematicalOps};
 use serde::{Deserialize, Serialize};
 use std::fmt;
 
-#[derive(Copy, Clone, Debug, Serialize, Deserialize)]
+#[derive(Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
 pub struct Number {
-    pub value: f64,
+    pub value: Decimal,
 }
 
-impl PartialEq for Number {
-    fn eq(&self, other: &Self) -> bool {
-        if self.value.is_nan() && other.value.is_nan()
-            || self.value.is_infinite() && other.value.is_infinite()
-        {
-            true
-        } else if self.value.is_nan()
-            || self.value.is_infinite()
-            || other.value.is_infinite()
-            || other.value.is_nan()
-        {
-            false
-        } else {
-            (self.value - other.value).abs() < f64::EPSILON
-        }
-    }
-}
+// impl PartialEq for Number {
+//     fn eq(&self, other: &Self) -> bool {
+//             (self.value - other.value).abs() < f64::EPSILON
+//         }
+//     }
+// }
 
 impl CalculatorEntry for Number {
     fn to_editable_string(&self) -> CalculatorResult<String> {
@@ -49,7 +39,7 @@ impl CalculatorEntry for Number {
         }
     }
     fn is_valid(&self) -> bool {
-        !self.value.is_nan() && !self.value.is_infinite()
+        true
     }
     fn validate(self) -> CalculatorResult<Entry> {
         if self.is_valid() {
@@ -69,7 +59,9 @@ impl CalculatorEntry for Number {
     }
     fn inverse(&self) -> CalculatorResult<Entry> {
         Self {
-            value: self.value.recip(),
+            value: constants::ONE
+                .checked_div(self.value)
+                .ok_or(CalculatorError::ArithmeticError)?,
         }
         .validate()
     }
@@ -79,70 +71,103 @@ impl CalculatorEntry for Number {
     fn sin(&self, angle_mode: CalculatorAngleMode) -> CalculatorResult<Entry> {
         Ok(Entry::Number(Self {
             value: match angle_mode {
-                CalculatorAngleMode::Degrees => self.value.to_radians().sin(),
-                CalculatorAngleMode::Radians => self.value.sin(),
-                CalculatorAngleMode::Grads => (self.value * std::f64::consts::PI / 200.0).sin(),
+                CalculatorAngleMode::Degrees => (self.value * constants::DEC_TO_RAD_MULTIPLIER)
+                    .checked_sin()
+                    .ok_or(CalculatorError::ArithmeticError)?,
+                CalculatorAngleMode::Radians => self
+                    .value
+                    .checked_sin()
+                    .ok_or(CalculatorError::ArithmeticError)?,
+                CalculatorAngleMode::Grads => (self.value * constants::GRAD_TO_RAD_MULTIPLIER)
+                    .checked_sin()
+                    .ok_or(CalculatorError::ArithmeticError)?,
             },
         }))
     }
     fn cos(&self, angle_mode: CalculatorAngleMode) -> CalculatorResult<Entry> {
         Ok(Entry::Number(Self {
             value: match angle_mode {
-                CalculatorAngleMode::Degrees => self.value.to_radians().cos(),
-                CalculatorAngleMode::Radians => self.value.cos(),
-                CalculatorAngleMode::Grads => (self.value * std::f64::consts::PI / 200.0).cos(),
+                CalculatorAngleMode::Degrees => (self.value * constants::DEC_TO_RAD_MULTIPLIER)
+                    .checked_cos()
+                    .ok_or(CalculatorError::ArithmeticError)?,
+                CalculatorAngleMode::Radians => self
+                    .value
+                    .checked_cos()
+                    .ok_or(CalculatorError::ArithmeticError)?,
+                CalculatorAngleMode::Grads => (self.value * constants::GRAD_TO_RAD_MULTIPLIER)
+                    .checked_cos()
+                    .ok_or(CalculatorError::ArithmeticError)?,
             },
         }))
     }
     fn tan(&self, angle_mode: CalculatorAngleMode) -> CalculatorResult<Entry> {
         Ok(Entry::Number(Self {
             value: match angle_mode {
-                CalculatorAngleMode::Degrees => self.value.to_radians().tan(),
-                CalculatorAngleMode::Radians => self.value.tan(),
-                CalculatorAngleMode::Grads => (self.value * std::f64::consts::PI / 200.0).tan(),
+                CalculatorAngleMode::Degrees => (self.value * constants::DEC_TO_RAD_MULTIPLIER)
+                    .checked_tan()
+                    .ok_or(CalculatorError::ArithmeticError)?,
+                CalculatorAngleMode::Radians => self
+                    .value
+                    .checked_tan()
+                    .ok_or(CalculatorError::ArithmeticError)?,
+                CalculatorAngleMode::Grads => (self.value * constants::GRAD_TO_RAD_MULTIPLIER)
+                    .checked_tan()
+                    .ok_or(CalculatorError::ArithmeticError)?,
             },
         }))
     }
-    fn asin(&self, angle_mode: CalculatorAngleMode) -> CalculatorResult<Entry> {
-        Ok(Entry::Number(Self {
-            value: match angle_mode {
-                CalculatorAngleMode::Degrees => self.value.asin().to_degrees(),
-                CalculatorAngleMode::Radians => self.value.asin(),
-                CalculatorAngleMode::Grads => self.value.asin() * 200.0 / std::f64::consts::PI,
-            },
-        }))
+    fn asin(&self, _angle_mode: CalculatorAngleMode) -> CalculatorResult<Entry> {
+        // TODO: Implement this
+        Err(CalculatorError::NotYetImplemented)
+        // Ok(Entry::Number(Self {
+        //     value: match angle_mode {
+        //         CalculatorAngleMode::Degrees => self.value.asin().to_degrees(),
+        //         CalculatorAngleMode::Radians => self.value.asin(),
+        //         CalculatorAngleMode::Grads => self.value.asin() * 200.0 / std::f64::consts::PI,
+        //     },
+        // }))
     }
-    fn acos(&self, angle_mode: CalculatorAngleMode) -> CalculatorResult<Entry> {
-        Ok(Entry::Number(Self {
-            value: match angle_mode {
-                CalculatorAngleMode::Degrees => self.value.acos().to_degrees(),
-                CalculatorAngleMode::Radians => self.value.acos(),
-                CalculatorAngleMode::Grads => self.value.acos() * 200.0 / std::f64::consts::PI,
-            },
-        }))
+    fn acos(&self, _angle_mode: CalculatorAngleMode) -> CalculatorResult<Entry> {
+        // TODO: Implement this
+        Err(CalculatorError::NotYetImplemented)
+        // Ok(Entry::Number(Self {
+        //     value: match angle_mode {
+        //         CalculatorAngleMode::Degrees => self.value.acos().to_degrees(),
+        //         CalculatorAngleMode::Radians => self.value.acos(),
+        //         CalculatorAngleMode::Grads => self.value.acos() * 200.0 / std::f64::consts::PI,
+        //     },
+        // }))
     }
-    fn atan(&self, angle_mode: CalculatorAngleMode) -> CalculatorResult<Entry> {
-        Ok(Entry::Number(Self {
-            value: match angle_mode {
-                CalculatorAngleMode::Degrees => self.value.atan().to_degrees(),
-                CalculatorAngleMode::Radians => self.value.atan(),
-                CalculatorAngleMode::Grads => self.value.atan() * 200.0 / std::f64::consts::PI,
-            },
-        }))
+    fn atan(&self, _angle_mode: CalculatorAngleMode) -> CalculatorResult<Entry> {
+        // TODO: Implement this
+        Err(CalculatorError::NotYetImplemented)
+        // Ok(Entry::Number(Self {
+        //     value: match angle_mode {
+        //         CalculatorAngleMode::Degrees => self.value.atan().to_degrees(),
+        //         CalculatorAngleMode::Radians => self.value.atan(),
+        //         CalculatorAngleMode::Grads => self.value.atan() * 200.0 / std::f64::consts::PI,
+        //     },
+        // }))
     }
     fn sqrt(&self) -> CalculatorResult<Entry> {
         Ok(Entry::Number(Self {
-            value: self.value.sqrt(),
+            value: self.value.sqrt().ok_or(CalculatorError::ArithmeticError)?,
         }))
     }
     fn log(&self) -> CalculatorResult<Entry> {
         Ok(Entry::Number(Self {
-            value: self.value.log10(),
+            value: self
+                .value
+                .checked_log10()
+                .ok_or(CalculatorError::ArithmeticError)?,
         }))
     }
     fn ln(&self) -> CalculatorResult<Entry> {
         Ok(Entry::Number(Self {
-            value: self.value.ln(),
+            value: self
+                .value
+                .checked_ln()
+                .ok_or(CalculatorError::ArithmeticError)?,
         }))
     }
 
@@ -190,8 +215,20 @@ impl CalculatorEntry for Number {
         match arg {
             Entry::Matrix(matrix) => self.iterated_binary_mat(matrix, Self::int_divide),
             Entry::Vector(vector) => self.iterated_binary_vec(vector, Self::int_divide),
-            Entry::Number(number) => Self {
-                value: self.value.div_euclid(number.value),
+            Entry::Number(number) => {
+                let q = (self.value / number.value).trunc();
+                Self {
+                    // Implementation based on https://doc.rust-lang.org/src/std/f64.rs.html#263-269
+                    value: if self.value % number.value < constants::ZERO {
+                        if number.value > constants::ZERO {
+                            q - constants::ONE
+                        } else {
+                            q + constants::ONE
+                        }
+                    } else {
+                        q
+                    },
+                }
             }
             .validate(),
         }
@@ -211,7 +248,10 @@ impl CalculatorEntry for Number {
             Entry::Matrix(matrix) => self.iterated_binary_mat(matrix, Self::pow),
             Entry::Vector(vector) => self.iterated_binary_vec(vector, Self::pow),
             Entry::Number(number) => Self {
-                value: self.value.powf(number.value),
+                value: self
+                    .value
+                    .checked_powd(number.value)
+                    .ok_or(CalculatorError::ArithmeticError)?,
             }
             .validate(),
         }
@@ -219,7 +259,9 @@ impl CalculatorEntry for Number {
 }
 
 impl Number {
-    pub const ZERO: Self = Self { value: 0.0_f64 };
+    pub const ZERO: Self = Self {
+        value: constants::ZERO,
+    };
 
     fn iterated_binary_vec(
         self,
@@ -269,7 +311,7 @@ impl fmt::Display for Number {
 }
 
 // Based on https://stackoverflow.com/a/65266882
-fn scientific(f: f64, precision: usize) -> String {
+fn scientific(f: Decimal, precision: usize) -> String {
     let mut ret = format!("{:.precision$E}", f, precision = precision);
     let exp = ret.split_off(ret.find('E').unwrap_or(0));
     let (exp_sign, exp) = exp
@@ -280,7 +322,7 @@ fn scientific(f: f64, precision: usize) -> String {
     format!("{}{} E{}{:0>pad$}", sign, ret, exp_sign, exp, pad = 2)
 }
 
-fn engineering(f: f64, precision: usize) -> String {
+fn engineering(f: Decimal, precision: usize) -> String {
     // Format the string so the first digit is always in the first column, and remove '.'. Requested precision + 2 to account for using 1, 2, or 3 digits for the whole portion of the string
     // 1,000 => 1000E3
     let all = format!(" {:.precision$E}", f, precision = precision)
@@ -331,7 +373,7 @@ fn engineering(f: f64, precision: usize) -> String {
     )
 }
 
-fn separated(f: f64, sep: char) -> String {
+fn separated(f: Decimal, sep: char) -> String {
     let mut ret = f.to_string();
     let start = if ret.starts_with('-') { 1 } else { 0 };
     let end = ret.find('.').unwrap_or_else(|| ret.len());

src/calc/entries/vector.rs

@@ -1,11 +1,11 @@
 use super::{Entry, Matrix, Number};
 use crate::{
     calc::{
+        entries::CalculatorEntry,
         errors::{CalculatorError, CalculatorResult},
-        types::CalculatorAngleMode,
-        CalculatorDisplayMode,
+        types::{CalculatorAngleMode, CalculatorDisplayMode},
     },
-    CalculatorEntry,
+    constants,
 };
 use serde::{Deserialize, Serialize};
 use std::fmt;
@@ -77,11 +77,13 @@ impl CalculatorEntry for Vector {
         self.iterated_unary(Number::negate)
     }
     fn abs(&self) -> CalculatorResult<Entry> {
-        let value: Entry = self
-            .values
+        let value: Entry =
+            self.values
                 .iter()
                 .try_fold(Entry::Number(Number::ZERO), |acc, n2| {
-                acc.add(&n2.pow(&Entry::Number(Number { value: 2.0_f64 }))?)
+                    acc.add(&n2.pow(&Entry::Number(Number {
+                        value: constants::TWO,
+                    }))?)
                 })?;
         value.sqrt()
     }

src/constants.rs

@@ -0,0 +1,26 @@
+use rust_decimal::Decimal;
+use rust_decimal_macros::dec;
+
+pub const ZERO: Decimal = Decimal::ZERO;
+pub const ONE: Decimal = Decimal::ONE;
+pub const TWO: Decimal = Decimal::TWO;
+
+pub const PI: Decimal = Decimal::PI;
+pub const E: Decimal = Decimal::E;
+pub const TAU: Decimal = Decimal::TWO_PI;
+
+pub const RAD_TO_DEC_MULTIPLIER: Decimal = dec!(57.295779513082320876798154814);
+pub const DEC_TO_RAD_MULTIPLIER: Decimal = dec!(0.0174532925199432957692369077);
+pub const GRAD_TO_RAD_MULTIPLIER: Decimal = dec!(0.0157079632679489661923132169);
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_constants() {
+        assert_eq!(RAD_TO_DEC_MULTIPLIER, dec!(180.0) / PI);
+        assert_eq!(DEC_TO_RAD_MULTIPLIER, PI / dec!(180.0));
+        assert_eq!(GRAD_TO_RAD_MULTIPLIER, PI / dec!(200.0));
+    }
+}

src/lib.rs

@@ -0,0 +1,2 @@
+pub mod calc;
+pub mod constants;