Initial commit

.gitignore

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

Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "newt"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "newt"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

flake.lock

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+{
+  "nodes": {
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1715927173,
+        "narHash": "sha256-2S8hVck6nlyiBifzymDvePl5HWgqvVgxkBZCRax1qD8=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "a2d19ef9305841f26c8ab908b1c09a84ca307e18",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1715668745,
+        "narHash": "sha256-xp62OkRkbUDNUc6VSqH02jB0FbOS+MsfMb7wL1RJOfA=",
+        "path": "/nix/store/7q4y8idjk2di380j1fxn4k7wx9y935cl-source",
+        "rev": "9ddcaffecdf098822d944d4147dd8da30b4e6843",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "fenix": "fenix",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1715839492,
+        "narHash": "sha256-EyjtjocGLtB7tqyqwBfadP4y5BBtT5EkoG3kq/zym5U=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "83ba42043166948db91fcfcfe30e0b7eac10b3d5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs.nixpkgs.url = "nixpkgs";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  inputs.fenix = {
+    url = "github:nix-community/fenix";
+    inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, fenix }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        fenix' = fenix.packages.${system};
+        nightly = fenix'.default;
+        stable = fenix'.stable;
+      in {
+        devShells.default = pkgs.mkShell {
+          packages = [ (fenix'.combine [
+            (stable.withComponents [
+              "cargo" "rustc" "rust-src" "rust-analyzer" "clippy"
+            ])
+            nightly.rustfmt
+          ]) pkgs.cargo-watch ];
+        };
+      });
+}

rustfmt.toml

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+edition = "2021"
+hard_tabs = true
+match_block_trailing_comma = true
+max_width = 80
+empty_item_single_line = false

src/internal/mod.rs

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+//! NOTE: Anything marked pub within this module or its children should not be
+//! considered stable when it comes to semver. However, they are exposed for
+//! advanced use cases.
+
+pub mod parse;

src/internal/parse.rs

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+use crate::Result;
+
+pub struct ValuePath {}
+pub enum Expr {
+	ValuePath(ValuePath),
+}
+
+pub struct If {
+	expr: Box<Expr>,
+	then: Ast,
+	else_: Option<Ast>,
+}
+pub struct For {
+	expr: Box<Expr>,
+	body: Ast,
+}
+pub struct Has {
+	expr: Box<Expr>,
+	body: Ast,
+}
+pub struct Print {
+	expr: Box<Expr>,
+}
+pub enum AstKind {
+	Text(String),
+	Print(Print),
+	Has(Has),
+	If(If),
+	For(For),
+}
+pub type Ast = Vec<AstKind>;
+
+pub fn parse(template: &str) -> Result<Ast> {
+	let mut out = Ast::new();
+	let mut remaining = template;
+	while !remaining.is_empty() {
+		let (ast, r) = parse_one(remaining)?;
+		remaining = r;
+		out.push(ast);
+	}
+	Ok(out)
+}
+
+pub fn parse_one(template: &str) -> Result<(AstKind, &str)> {
+	if template.starts_with("{{") {
+		parse_text(template)
+	} else if let Some(r) = template.strip_prefix('{') {
+		parse_block(r)
+	} else {
+		parse_text(template)
+	}
+}
+
+pub fn parse_text(template: &str) -> Result<(AstKind, &str)> {
+	assert!(template.starts_with("{{") || !template.starts_with('{'));
+
+	let template.trim_start_matches(|c| c != '{')
+}

src/lib.rs

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+pub mod internal;
+
+use std::fmt::Write;
+
+pub enum Error {}
+pub type Result<T> = core::result::Result<T, Error>;
+
+pub trait Value {
+	fn print(&self, w: &mut dyn Write) -> core::fmt::Result;
+	fn has(&self) -> Option<&dyn Value>
+	where
+		Self: Sized,
+	{
+		Some(self)
+	}
+
+	fn if_(&self) -> bool {
+		true
+	}
+
+	fn for_(&self, index: usize) -> Option<&dyn Value>
+	where
+		Self: Sized,
+	{
+		if index == 0 {
+			Some(self)
+		} else {
+			None
+		}
+	}
+}
+
+impl<'a, T> Value for &'a T
+where
+	T: Value,
+{
+	fn print(&self, w: &mut dyn Write) -> core::fmt::Result {
+		(&**self).print(w)
+	}
+}
+
+mod build {}
+
+pub struct Newt {}
+impl Newt {
+	pub fn build(template: &str) -> Result<Self> {
+	}
+
+	pub fn build_and_execute(
+		template: &str,
+		value: &dyn Value,
+	) -> Result<String> {
+		let newt = Newt::build(template)?;
+
+		newt.execute(value)
+	}
+}
+
+#[cfg(test)]
+mod test {
+	#[test]
+	fn wishlist() {
+		let tmpl = r#"Hello, {.}"#;
+		let out = Newt::build_and_execute(tl, "World!").unwrap();
+		assert_eq!(out, "Hello, World!");
+	}
+}