SourceRange can be optional

src/wasm-lib/Cargo.lock

@@ -221,6 +221,15 @@ dependencies = [
  "rustc-demangle",
 ]
 
+[[package]]
+name = "backtrace-ext"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "537beee3be4a18fb023b570f80e3ae28003db9167a751266b259926e25539d50"
+dependencies = [
+ "backtrace",
+]
+
 [[package]]
 name = "base64"
 version = "0.13.1"
@@ -1325,6 +1334,12 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "is_ci"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7655c9839580ee829dfacba1d1278c2b7883e50a277ff7541299489d6bdfdc45"
+
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -1396,6 +1411,7 @@ dependencies = [
  "js-sys",
  "kittycad",
  "lazy_static",
+ "miette",
  "mime_guess",
  "parse-display",
  "pretty_assertions",
@@ -1556,6 +1572,37 @@ version = "2.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "523dc4f511e55ab87b694dc30d0f820d60906ef06413f93d4d7a1385599cc149"
 
+[[package]]
+name = "miette"
+version = "7.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4edc8853320c2a0dab800fbda86253c8938f6ea88510dc92c5f1ed20e794afc1"
+dependencies = [
+ "backtrace",
+ "backtrace-ext",
+ "cfg-if",
+ "miette-derive",
+ "owo-colors",
+ "supports-color",
+ "supports-hyperlinks",
+ "supports-unicode",
+ "terminal_size",
+ "textwrap",
+ "thiserror",
+ "unicode-width",
+]
+
+[[package]]
+name = "miette-derive"
+version = "7.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dcf09caffaac8068c346b6df2a7fc27a177fd20b39421a39ce0a211bde679a6c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.66",
+]
+
 [[package]]
 name = "mime"
 version = "0.3.17"
@@ -1715,6 +1762,12 @@ dependencies = [
  "thiserror",
 ]
 
+[[package]]
+name = "owo-colors"
+version = "4.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "caff54706df99d2a78a5a4e3455ff45448d81ef1bb63c22cd14052ca0e993a3f"
+
 [[package]]
 name = "parking_lot"
 version = "0.11.2"
@@ -2625,6 +2678,12 @@ version = "1.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3c5e1a9a646d36c3599cd173a41282daf47c44583ad367b8e6837255952e5c67"
 
+[[package]]
+name = "smawk"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7c388c1b5e93756d0c740965c41e8822f866621d41acbdf6336a6a168f8840c"
+
 [[package]]
 name = "socket2"
 version = "0.5.6"
@@ -2710,6 +2769,27 @@ version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
+[[package]]
+name = "supports-color"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9829b314621dfc575df4e409e79f9d6a66a3bd707ab73f23cb4aa3a854ac854f"
+dependencies = [
+ "is_ci",
+]
+
+[[package]]
+name = "supports-hyperlinks"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c0a1e5168041f5f3ff68ff7d95dcb9c8749df29f6e7e89ada40dd4c9de404ee"
+
+[[package]]
+name = "supports-unicode"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7401a30af6cb5818bb64852270bb722533397edcfc7344954a38f420819ece2"
+
 [[package]]
 name = "syn"
 version = "1.0.109"
@@ -2806,6 +2886,27 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "terminal_size"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21bebf2b7c9e0a515f6e0f8c51dc0f8e4696391e6f1ff30379559f8365fb0df7"
+dependencies = [
+ "rustix",
+ "windows-sys 0.48.0",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.16.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23d434d3f8967a09480fb04132ebe0a3e088c173e6d0ee7897abbdf4eab0f8b9"
+dependencies = [
+ "smawk",
+ "unicode-linebreak",
+ "unicode-width",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.61"
@@ -3237,6 +3338,12 @@ version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
+[[package]]
+name = "unicode-linebreak"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b09c83c3c29d37506a3e260c08c03743a6bb66a9cd432c6934ab501a190571f"
+
 [[package]]
 name = "unicode-normalization"
 version = "0.1.23"

src/wasm-lib/kcl/Cargo.toml

@@ -26,6 +26,8 @@ git_rev = "0.1.0"
 gltf-json = "1.4.1"
 kittycad = { workspace = true, features = ["clap"] }
 lazy_static = "1.4.0"
+# TODO: Make this optional
+miette = { version = "7.2.0", optional = false, features = ["fancy"] }
 mime_guess = "2.0.4"
 parse-display = "0.9.1"
 reqwest = { version = "0.11.26", default-features = false, features = ["stream", "rustls-tls"] }
@@ -62,6 +64,7 @@ tower-lsp = { version = "0.20.0", features = ["proposed"] }
 [features]
 default = ["cli", "engine"]
 cli = ["dep:clap"]
+# miette = ["dep:miette"]
 engine = []
 
 [profile.release]

src/wasm-lib/kcl/src/errors.rs

@@ -32,6 +32,32 @@ pub enum KclError {
     Internal(KclErrorDetails),
 }
 
+/// A KCL error that can be displayed fancy.
+#[derive(Error, Debug, miette::Diagnostic)]
+#[error("KCL error: {error}")]
+pub struct KclErrorReport {
+    #[source]
+    error: KclError,
+    // The Source that we're gonna be printing snippets out of.
+    // This can be a String if you don't have or care about file names.
+    #[source_code]
+    src: miette::NamedSource<String>,
+    // Snippets and highlights can be included in the diagnostic!
+    #[label("Error here")]
+    source_range: Option<SourceRange>,
+}
+
+impl KclErrorReport {
+    /// Create a new error report.
+    pub fn new(error: KclError, kcl_filename: String, kcl_code: String, source_range: Option<SourceRange>) -> Self {
+        Self {
+            error,
+            src: miette::NamedSource::new(kcl_filename, kcl_code),
+            source_range,
+        }
+    }
+}
+
 #[derive(Debug, Serialize, Deserialize, ts_rs::TS, Clone, PartialEq, Eq)]
 #[ts(export)]
 pub struct KclErrorDetails {

src/wasm-lib/kcl/src/executor.rs

@@ -619,6 +619,14 @@ pub struct Rotation(#[ts(type = "[number, number, number, number]")] pub [f64; 4
 #[ts(export)]
 pub struct SourceRange(#[ts(type = "[number, number]")] pub [usize; 2]);
 
+impl From<SourceRange> for miette::SourceSpan {
+    fn from(value: SourceRange) -> Self {
+        let [start, end] = value.0;
+        let length = end - start;
+        miette::SourceSpan::new(start.into(), length)
+    }
+}
+
 impl SourceRange {
     /// Create a new source range.
     pub fn new(start: usize, end: usize) -> Self {