chore(tvixbolt): move from //corp to //web r/7595

Assigning copyright to the TVL community (whatever that is), and
adding AGPL-3.0-or-later license.

I also cleaned up some of the stuff on the landing page.

Change-Id: I4dbca19406e00e5105fed50e8fb64e0fcca23e3a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11013
Autosubmit: tazjin <tazjin@tvl.su>
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

8 files changed, 2199 insertions, 0 deletions

diff --git a/web/tvixbolt/.gitignore b/web/tvixbolt/.gitignore
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index 000000000000..77fdd3e5cfc1
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diff --git a/web/tvixbolt/Cargo.lock b/web/tvixbolt/Cargo.lock
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index 000000000000..7c7afb63f95b
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diff --git a/web/tvixbolt/Cargo.toml b/web/tvixbolt/Cargo.toml
new file mode 100644
index 000000000000..ce5ffb90e3bd
--- /dev/null
+++ b/web/tvixbolt/Cargo.toml
@@ -0,0 +1,26 @@
+[package]
+name = "tvixbolt"
+version = "0.1.0"
+edition = "2021"
+
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+yew-router = "0.16"
+codemap = "0.1.3"
+serde_urlencoded = "*" # pinned by yew
+rnix = "0.11.0"
+
+# needs to be in sync with nixpkgs
+wasm-bindgen = "= 0.2.91"
+
+[dependencies.tvix-eval]
+path = "../../tvix/eval"
+default-features = false
+
+[dependencies.serde]
+version = "*" # pinned by yew
+features = [ "derive" ]
+
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+features = [ "HtmlDetailsElement" ]
diff --git a/web/tvixbolt/LICENSE b/web/tvixbolt/LICENSE
new file mode 100644
index 000000000000..be3f7b28e564
--- /dev/null
+++ b/web/tvixbolt/LICENSE
@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate.  Many developers of free software are heartened and
+encouraged by the resulting cooperation.  However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+  The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community.  It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server.  Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+  An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals.  This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
+this license.
+
+  The precise terms and conditions for copying, distribution and
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+  Nothing in this License shall be construed as excluding or limiting
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+  13. Remote Network Interaction; Use with the GNU General Public License.
+
+  Notwithstanding any other provision of this License, if you modify the
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+  14. Revised Versions of this License.
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+  The Free Software Foundation may publish revised and/or new versions of
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+  17. Interpretation of Sections 15 and 16.
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+  If the disclaimer of warranty and limitation of liability provided
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+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
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+    This program is distributed in the hope that it will be useful,
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+    You should have received a copy of the GNU Affero General Public License
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+
+Also add information on how to contact you by electronic and paper mail.
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+  If your software can interact with users remotely through a computer
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+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
diff --git a/web/tvixbolt/default.nix b/web/tvixbolt/default.nix
new file mode 100644
index 000000000000..9b6baa582fb0
--- /dev/null
+++ b/web/tvixbolt/default.nix
@@ -0,0 +1,74 @@
+{ depot, lib, pkgs, ... }:
+
+let
+  wasmRust = pkgs.rust-bin.stable.latest.default.override {
+    targets = [ "wasm32-unknown-unknown" ];
+  };
+
+  cargoToml = with builtins; fromTOML (readFile ./Cargo.toml);
+
+  wasmBindgenMatch =
+    cargoToml.dependencies.wasm-bindgen == "= ${pkgs.wasm-bindgen-cli.version}";
+
+  assertWasmBindgen = assert (lib.assertMsg wasmBindgenMatch ''
+    Due to instability in the Rust WASM ecosystem, the trunk build
+    tool enforces that the Cargo-dependency version of `wasm-bindgen`
+    MUST match the version of the CLI supplied in the environment.
+
+    This can get out of sync when nixpkgs is updated. To resolve it,
+    wasm-bindgen must be bumped in the Cargo.toml file and cargo needs
+    to be run to resolve the dependencies.
+
+    Versions of `wasm-bindgen` in Cargo.toml:
+
+      Expected: '= ${pkgs.wasm-bindgen-cli.version}'
+      Actual:   '${cargoToml.dependencies.wasm-bindgen}'
+  ''); pkgs.wasm-bindgen-cli;
+
+  deps = [
+    pkgs.binaryen
+    pkgs.sass
+    pkgs.trunk
+
+    wasmRust
+    assertWasmBindgen
+  ];
+
+  # Cargo.toml needs to be patched with the /nix/store source path of
+  # tvix-eval.
+  cargoTomlPatch = pkgs.writeText "tvix-eval-src.patch" ''
+    diff --git a/Cargo.toml b/Cargo.toml
+    index 75006bec18..6ca244bbb2 100644
+    --- a/Cargo.toml
+    +++ b/Cargo.toml
+    @@ -16,7 +16,7 @@ rnix = "0.11.0"
+     wasm-bindgen = "= 0.2.83"
+
+     [dependencies.tvix-eval]
+    -path = "../../tvix/eval"
+    +path = "${depot.tvix.crates.workspaceMembers.tvix-eval.build.src}"
+     default-features = false
+
+     [dependencies.serde]
+  '';
+in
+pkgs.rustPlatform.buildRustPackage rec {
+  pname = "tvixbolt";
+  version = "canon";
+  src = lib.cleanSource ./.;
+
+  cargoLock.lockFile = ./Cargo.lock;
+
+  patches = [
+    cargoTomlPatch
+  ];
+
+  buildPhase = ''
+    export PATH=${lib.makeBinPath deps}:$PATH
+    mkdir home
+    export HOME=$PWD/home
+    trunk build --release -d $out
+  '';
+
+  dontInstall = true;
+}
diff --git a/web/tvixbolt/index.css b/web/tvixbolt/index.css
new file mode 100644
index 000000000000..95bd7d098362
--- /dev/null
+++ b/web/tvixbolt/index.css
@@ -0,0 +1,7 @@
+.footer {
+    text-align: right;
+}
+
+.lod {
+    text-align: center;
+}
diff --git a/web/tvixbolt/index.html b/web/tvixbolt/index.html
new file mode 100644
index 000000000000..410eb4eae298
--- /dev/null
+++ b/web/tvixbolt/index.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <link rel="stylesheet"
+          href="https://static.tvl.su/latest/terminal.min.css" />
+    <link data-trunk rel="inline" href="index.css">
+    <title>Tvixbolt</title>
+  </head>
+</html>
diff --git a/web/tvixbolt/src/main.rs b/web/tvixbolt/src/main.rs
new file mode 100644
index 000000000000..2e68e03fb0ba
--- /dev/null
+++ b/web/tvixbolt/src/main.rs
@@ -0,0 +1,315 @@
+// tvixbolt - an online tool for exploring Tvix language evaluation
+//
+// Copyright (C) The TVL Community
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use std::fmt::Write;
+
+use serde::{Deserialize, Serialize};
+use tvix_eval::observer::{DisassemblingObserver, TracingObserver};
+use web_sys::HtmlDetailsElement;
+use web_sys::HtmlTextAreaElement;
+use yew::prelude::*;
+use yew::TargetCast;
+use yew_router::{prelude::*, AnyRoute};
+
+#[derive(Clone)]
+enum Msg {
+    CodeChange(String),
+    ToggleTrace(bool),
+    ToggleDisplayAst(bool),
+
+    // Required because browsers are stupid and it's easy to get into
+    // infinite loops with `ontoggle` events.
+    NoOp,
+}
+
+#[derive(Clone, Serialize, Deserialize)]
+struct Model {
+    code: String,
+
+    // #[serde(skip_serializing)]
+    trace: bool,
+
+    // #[serde(skip_serializing)]
+    display_ast: bool,
+}
+
+fn tvixbolt_overview() -> Html {
+    html! {
+        <>
+          <p>
+            {"This page lets you explore the bytecode generated by the "}
+            <a href="https://tvix.dev">{"Tvix"}</a>
+            {" compiler for the Nix language."}
+          </p>
+          <p>
+            {"Tvix is still "}<i>{"work-in-progress"}</i>{" and we would appreciate "}
+            {"if you told us about bugs you find."}
+          </p>
+          <p>
+            {"Tvixbolt is a project by "}
+            <a href="https://tvl.fyi">
+              {"TVL"}
+            </a>
+            {"."}
+          </p>
+        </>
+    }
+}
+
+fn footer_link(location: &'static str, name: &str) -> Html {
+    html! {
+        <>
+            <a class="uncoloured-link" href={location}>{name}</a>{" | "}
+        </>
+    }
+}
+
+fn footer() -> Html {
+    html! {
+        <>
+        <hr/>
+        <footer>
+          <p class="footer">
+            {footer_link("https://tvl.fyi", "home")}
+            {footer_link("https://cs.tvl.fyi", "code")}
+            {footer_link("https://tvl.fyi/builds", "ci")}
+            {footer_link("https://b.tvl.fyi", "bugs")}
+            {"© TVL"}
+          </p>
+          <p class="lod">{"ಠ_ಠ"}</p>
+        </footer>
+        </>
+    }
+}
+
+impl Component for Model {
+    type Message = Msg;
+    type Properties = ();
+
+    fn create(_: &Context<Self>) -> Self {
+        BrowserHistory::new()
+            .location()
+            .query::<Self>()
+            .unwrap_or_else(|_| Self {
+                code: String::new(),
+                trace: false,
+                display_ast: false,
+            })
+    }
+
+    fn update(&mut self, _: &Context<Self>, msg: Self::Message) -> bool {
+        match msg {
+            Msg::ToggleTrace(trace) => {
+                self.trace = trace;
+            }
+
+            Msg::ToggleDisplayAst(display_ast) => {
+                self.display_ast = display_ast;
+            }
+
+            Msg::CodeChange(new_code) => {
+                self.code = new_code;
+            }
+
+            Msg::NoOp => {}
+        }
+
+        let _ = BrowserHistory::new().replace_with_query(AnyRoute::new("/"), self.clone());
+
+        true
+    }
+
+    fn view(&self, ctx: &Context<Self>) -> Html {
+        // This gives us a component's "`Scope`" which allows us to send messages, etc to the component.
+        let link = ctx.link();
+        html! {
+            <>
+            <div class="container">
+                <h1>{"tvixbolt"}</h1>
+                {tvixbolt_overview()}
+                <form>
+                  <fieldset>
+                    <legend>{"Input"}</legend>
+
+                    <div class="form-group">
+                        <label for="code">{"Nix code:"}</label>
+                        <textarea
+                         oninput={link.callback(|e: InputEvent| {
+                             let ta = e.target_unchecked_into::<HtmlTextAreaElement>().value();
+                             Msg::CodeChange(ta)
+
+                         })}
+                         id="code" cols="30" rows="10" value={self.code.clone()}>
+                         </textarea>
+                    </div>
+                  </fieldset>
+                </form>
+                <hr />
+                {self.run(ctx)}
+                {footer()}
+            </div>
+            </>
+        }
+    }
+}
+
+impl Model {
+    fn run(&self, ctx: &Context<Self>) -> Html {
+        if self.code.is_empty() {
+            return html! {
+                <p>
+                  {"Enter some Nix code above to get started. Don't know Nix yet? "}
+                  {"Check out "}
+                  <a href="https://code.tvl.fyi/about/nix/nix-1p/README.md">{"nix-1p"}</a>
+                  {"!"}
+                </p>
+            };
+        }
+
+        html! {
+            <>
+              <h2>{"Result:"}</h2>
+            {eval(self).display(ctx, self)}
+            </>
+        }
+    }
+}
+
+#[derive(Default)]
+struct Output {
+    errors: String,
+    warnings: String,
+    output: String,
+    bytecode: Vec<u8>,
+    trace: Vec<u8>,
+    ast: String,
+}
+
+fn maybe_show(title: &str, s: &str) -> Html {
+    if s.is_empty() {
+        html! {}
+    } else {
+        html! {
+            <>
+              <h3>{title}</h3>
+              <pre>{s}</pre>
+            </>
+        }
+    }
+}
+
+fn maybe_details(
+    ctx: &Context<Model>,
+    title: &str,
+    s: &str,
+    display: bool,
+    toggle: fn(bool) -> Msg,
+) -> Html {
+    let link = ctx.link();
+    if display {
+        let msg = toggle(false);
+        html! {
+            <details open=true
+                     ontoggle={link.callback(move |e: Event| {
+                         let details = e.target_unchecked_into::<HtmlDetailsElement>();
+                         if !details.open() {
+                             msg.clone()
+                         } else {
+                             Msg::NoOp
+                         }
+                     })}>
+
+              <summary><h3 style="display: inline;">{title}</h3></summary>
+              <pre>{s}</pre>
+            </details>
+        }
+    } else {
+        let msg = toggle(true);
+        html! {
+            <details ontoggle={link.callback(move |e: Event| {
+                         let details = e.target_unchecked_into::<HtmlDetailsElement>();
+                         if details.open() {
+                             msg.clone()
+                         } else {
+                             Msg::NoOp
+                         }
+                     })}>
+              <summary><h3 style="display: inline;">{title}</h3></summary>
+            </details>
+        }
+    }
+}
+
+impl Output {
+    fn display(self, ctx: &Context<Model>, model: &Model) -> Html {
+        html! {
+            <>
+            {maybe_show("Errors:", &self.errors)}
+            {maybe_show("Warnings:", &self.warnings)}
+            {maybe_show("Output:", &self.output)}
+            {maybe_show("Bytecode:", &String::from_utf8_lossy(&self.bytecode))}
+            {maybe_details(ctx, "Runtime trace:", &String::from_utf8_lossy(&self.trace), model.trace, Msg::ToggleTrace)}
+            {maybe_details(ctx, "Parsed AST:", &self.ast, model.display_ast, Msg::ToggleDisplayAst)}
+            </>
+        }
+    }
+}
+
+fn eval(model: &Model) -> Output {
+    let mut out = Output::default();
+
+    if model.code.is_empty() {
+        return out;
+    }
+
+    let mut eval = tvix_eval::Evaluation::new_pure();
+    let source = eval.source_map();
+
+    let result = {
+        let mut compiler_observer = DisassemblingObserver::new(source.clone(), &mut out.bytecode);
+        eval.compiler_observer = Some(&mut compiler_observer);
+
+        let mut runtime_observer = TracingObserver::new(&mut out.trace);
+        if model.trace {
+            eval.runtime_observer = Some(&mut runtime_observer);
+        }
+
+        eval.evaluate(&model.code, Some("/nixbolt".into()))
+    };
+
+    if model.display_ast {
+        if let Some(ref expr) = result.expr {
+            out.ast = tvix_eval::pretty_print_expr(expr);
+        }
+    }
+
+    out.output = match result.value {
+        Some(val) => val.to_string(),
+        None => "".to_string(),
+    };
+
+    for warning in result.warnings {
+        writeln!(
+            &mut out.warnings,
+            "{}\n",
+            warning.fancy_format_str(&source).trim(),
+        )
+        .unwrap();
+    }
+
+    if !result.errors.is_empty() {
+        for error in &result.errors {
+            writeln!(&mut out.errors, "{}\n", error.fancy_format_str().trim(),).unwrap();
+        }
+
+        return out;
+    }
+
+    out
+}
+
+fn main() {
+    yew::start_app::<Model>();
+}