Merge 143732d2a82c057f9efe48895fc798e422894fec into 9a6268050fb769e18c4889fa5f59d4150e8878d6

- restore ability to override a package locally
- cut down on some repeated logic
- more detailed errors

crates/typst-cli/src/world.rs

@@ -404,7 +404,9 @@ fn system_path(
 
     // Join the path to the root. If it tries to escape, deny
     // access. Note: It can still escape via symlinks.
-    id.vpath().resolve(root).ok_or(FileError::AccessDenied)
+    id.vpath()
+        .resolve(root)
+        .ok_or_else(|| FileError::AccessDenied(id.vpath().as_rootless_path().into()))
 }
 
 /// Reads a file from a `FileId`.
@@ -427,7 +429,7 @@ fn read(
 fn read_from_disk(path: &Path) -> FileResult<Vec<u8>> {
     let f = |e| FileError::from_io(e, path);
     if fs::metadata(path).map_err(f)?.is_dir() {
-        Err(FileError::IsDirectory)
+        Err(FileError::IsDirectory(path.into()))
     } else {
         fs::read(path).map_err(f)
     }

crates/typst-html/src/convert.rs

@@ -109,10 +109,7 @@ fn handle(
             styles.chain(&style),
             Region::new(Size::splat(Abs::inf()), Axes::splat(false)),
         )?;
-        output.push(HtmlNode::Frame(HtmlFrame {
-            inner: frame,
-            text_size: styles.resolve(TextElem::size),
-        }));
+        output.push(HtmlNode::Frame(HtmlFrame::new(frame, styles)));
     } else {
         engine.sink.warn(warning!(
             child.span(),

crates/typst-html/src/dom.rs

@@ -2,10 +2,11 @@ use std::fmt::{self, Debug, Display, Formatter};
 
 use ecow::{EcoString, EcoVec};
 use typst_library::diag::{bail, HintedStrResult, StrResult};
-use typst_library::foundations::{cast, Dict, Repr, Str};
+use typst_library::foundations::{cast, Dict, Repr, Str, StyleChain};
 use typst_library::introspection::{Introspector, Tag};
 use typst_library::layout::{Abs, Frame};
 use typst_library::model::DocumentInfo;
+use typst_library::text::TextElem;
 use typst_syntax::Span;
 use typst_utils::{PicoStr, ResolvedPicoStr};
 
@@ -279,3 +280,10 @@ pub struct HtmlFrame {
     /// consistently.
     pub text_size: Abs,
 }
+
+impl HtmlFrame {
+    /// Wraps a laid-out frame.
+    pub fn new(inner: Frame, styles: StyleChain) -> Self {
+        Self { inner, text_size: styles.resolve(TextElem::size) }
+    }
+}

crates/typst-html/src/encode.rs

@@ -121,6 +121,7 @@ fn write_children(w: &mut Writer, element: &HtmlElement) -> SourceResult<()> {
     let pretty_inside = allows_pretty_inside(element.tag)
         && element.children.iter().any(|node| match node {
             HtmlNode::Element(child) => wants_pretty_around(child.tag),
+            HtmlNode::Frame(_) => true,
             _ => false,
         });
 
@@ -305,14 +306,6 @@ fn write_escape(w: &mut Writer, c: char) -> StrResult<()> {
 
 /// Encode a laid out frame into the writer.
 fn write_frame(w: &mut Writer, frame: &HtmlFrame) {
-    // FIXME: This string replacement is obviously a hack.
-    let svg = typst_svg::svg_frame(&frame.inner).replace(
-        "<svg class",
-        &format!(
-            "<svg style=\"overflow: visible; width: {}em; height: {}em;\" class",
-            frame.inner.width() / frame.text_size,
-            frame.inner.height() / frame.text_size,
-        ),
-    );
+    let svg = typst_svg::svg_html_frame(&frame.inner, frame.text_size);
     w.buf.push_str(&svg);
 }

crates/typst-kit/src/package.rs

@@ -87,6 +87,7 @@ impl PackageStorage {
     ) -> PackageResult<PathBuf> {
         let subdir = format!("{}/{}/{}", spec.namespace, spec.name, spec.version);
 
+        // By default, search for the package locally
         if let Some(packages_dir) = &self.package_path {
             let dir = packages_dir.join(&subdir);
             if dir.exists() {
@@ -94,6 +95,7 @@ impl PackageStorage {
             }
         }
 
+        // As a fallback, look into the cache and possibly download from network.
         if let Some(cache_dir) = &self.package_cache_path {
             let dir = cache_dir.join(&subdir);
             if dir.exists() {
@@ -102,14 +104,42 @@ impl PackageStorage {
 
             // Download from network if it doesn't exist yet.
             if spec.namespace == DEFAULT_NAMESPACE {
-                self.download_package(spec, cache_dir, progress)?;
-                if dir.exists() {
-                    return Ok(dir);
-                }
+                return self.download_package(spec, cache_dir, progress);
             }
         }
 
-        Err(PackageError::NotFound(spec.clone()))
+        // None of the strategies above found the package, so all code paths
+        // from now on fail. The rest of the function is only to determine the
+        // cause of the failure.
+        // We try `namespace/` then `namespace/name/` then `namespace/name/version/`
+        // and see where the first error occurs.
+        let not_found = |msg| Err(PackageError::NotFound(spec.clone(), msg));
+
+        let Some(packages_dir) = &self.package_path else {
+            return not_found(eco_format!("cannot access local package storage"));
+        };
+        let namespace_dir = packages_dir.join(format!("{}", spec.namespace));
+        if !namespace_dir.exists() {
+            return not_found(eco_format!(
+                "namespace @{} should be located at {}",
+                spec.namespace,
+                namespace_dir.display()
+            ));
+        }
+        let package_dir = namespace_dir.join(format!("{}", spec.name));
+        if !package_dir.exists() {
+            return not_found(eco_format!(
+                "{} does not have package '{}'",
+                namespace_dir.display(),
+                spec.name
+            ));
+        }
+        let latest = self.determine_latest_version(&spec.versionless()).ok();
+        Err(PackageError::VersionNotFound(
+            spec.clone(),
+            latest,
+            eco_format!("{}", namespace_dir.display()),
+        ))
     }
 
     /// Tries to determine the latest version of a package.
@@ -171,21 +201,29 @@ impl PackageStorage {
         spec: &PackageSpec,
         cache_dir: &Path,
         progress: &mut dyn Progress,
-    ) -> PackageResult<()> {
+    ) -> PackageResult<PathBuf> {
         assert_eq!(spec.namespace, DEFAULT_NAMESPACE);
 
-        let url = format!(
-            "{DEFAULT_REGISTRY}/{DEFAULT_NAMESPACE}/{}-{}.tar.gz",
-            spec.name, spec.version
-        );
+        let namespace_url = format!("{DEFAULT_REGISTRY}/{DEFAULT_NAMESPACE}");
+        let url = format!("{namespace_url}/{}-{}.tar.gz", spec.name, spec.version);
 
         let data = match self.downloader.download_with_progress(&url, progress) {
             Ok(data) => data,
             Err(ureq::Error::Status(404, _)) => {
                 if let Ok(version) = self.determine_latest_version(&spec.versionless()) {
-                    return Err(PackageError::VersionNotFound(spec.clone(), version));
+                    return Err(PackageError::VersionNotFound(
+                        spec.clone(),
+                        Some(version),
+                        eco_format!("{namespace_url}"),
+                    ));
                 } else {
-                    return Err(PackageError::NotFound(spec.clone()));
+                    return Err(PackageError::NotFound(
+                        spec.clone(),
+                        eco_format!(
+                            "{namespace_url} does not have package '{}'",
+                            spec.name
+                        ),
+                    ));
                 }
             }
             Err(err) => {
@@ -235,8 +273,8 @@ impl PackageStorage {
         // broken packages still occur even with the rename safeguard, we might
         // consider more complex solutions like file locking or checksums.
         match fs::rename(&tempdir, &package_dir) {
-            Ok(()) => Ok(()),
-            Err(err) if err.kind() == io::ErrorKind::DirectoryNotEmpty => Ok(()),
+            Ok(()) => Ok(package_dir),
+            Err(err) if err.kind() == io::ErrorKind::DirectoryNotEmpty => Ok(package_dir),
             Err(err) => Err(error("failed to move downloaded package directory", err)),
         }
     }

crates/typst-library/src/diag.rs

@@ -440,13 +440,13 @@ pub enum FileError {
     /// A file was not found at this path.
     NotFound(PathBuf),
     /// A file could not be accessed.
-    AccessDenied,
+    AccessDenied(PathBuf),
     /// A directory was found, but a file was expected.
-    IsDirectory,
+    IsDirectory(PathBuf),
     /// The file is not a Typst source file, but should have been.
-    NotSource,
+    NotSource(PathBuf),
     /// The file was not valid UTF-8, but should have been.
-    InvalidUtf8,
+    InvalidUtf8(Option<PathBuf>),
     /// The package the file is part of could not be loaded.
     Package(PackageError),
     /// Another error.
@@ -460,11 +460,11 @@ impl FileError {
     pub fn from_io(err: io::Error, path: &Path) -> Self {
         match err.kind() {
             io::ErrorKind::NotFound => Self::NotFound(path.into()),
-            io::ErrorKind::PermissionDenied => Self::AccessDenied,
+            io::ErrorKind::PermissionDenied => Self::AccessDenied(path.into()),
             io::ErrorKind::InvalidData
                 if err.to_string().contains("stream did not contain valid UTF-8") =>
             {
-                Self::InvalidUtf8
+                Self::InvalidUtf8(Some(path.into()))
             }
             _ => Self::Other(Some(eco_format!("{err}"))),
         }
@@ -479,10 +479,19 @@ impl Display for FileError {
             Self::NotFound(path) => {
                 write!(f, "file not found (searched at {})", path.display())
             }
-            Self::AccessDenied => f.pad("failed to load file (access denied)"),
-            Self::IsDirectory => f.pad("failed to load file (is a directory)"),
-            Self::NotSource => f.pad("not a typst source file"),
-            Self::InvalidUtf8 => f.pad("file is not valid utf-8"),
+            Self::AccessDenied(path) => {
+                write!(f, "failed to load file {} (access denied)", path.display())
+            }
+            Self::IsDirectory(path) => {
+                write!(f, "failed to load file {} (is a directory)", path.display())
+            }
+            Self::NotSource(path) => {
+                write!(f, "{} is not a typst source file", path.display())
+            }
+            Self::InvalidUtf8(Some(path)) => {
+                write!(f, "file {} is not valid utf-8", path.display())
+            }
+            Self::InvalidUtf8(None) => f.pad("file is not valid utf-8"),
             Self::Package(error) => error.fmt(f),
             Self::Other(Some(err)) => write!(f, "failed to load file ({err})"),
             Self::Other(None) => f.pad("failed to load file"),
@@ -492,13 +501,13 @@ impl Display for FileError {
 
 impl From<Utf8Error> for FileError {
     fn from(_: Utf8Error) -> Self {
-        Self::InvalidUtf8
+        Self::InvalidUtf8(None)
     }
 }
 
 impl From<FromUtf8Error> for FileError {
     fn from(_: FromUtf8Error) -> Self {
-        Self::InvalidUtf8
+        Self::InvalidUtf8(None)
     }
 }
 
@@ -519,13 +528,15 @@ pub type PackageResult<T> = Result<T, PackageError>;
 
 /// An error that occurred while trying to load a package.
 ///
-/// Some variants have an optional string can give more details, if available.
+/// Some variants have an optional string that can give more details, if available.
 #[derive(Debug, Clone, Eq, PartialEq, Hash)]
 pub enum PackageError {
     /// The specified package does not exist.
-    NotFound(PackageSpec),
+    /// Additionally provides information on where we tried to find the package.
+    NotFound(PackageSpec, EcoString),
     /// The specified package found, but the version does not exist.
-    VersionNotFound(PackageSpec, PackageVersion),
+    /// TODO: make the registry part of the error better typed
+    VersionNotFound(PackageSpec, Option<PackageVersion>, EcoString),
     /// Failed to retrieve the package through the network.
     NetworkFailed(Option<EcoString>),
     /// The package archive was malformed.
@@ -539,15 +550,20 @@ impl std::error::Error for PackageError {}
 impl Display for PackageError {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         match self {
-            Self::NotFound(spec) => {
-                write!(f, "package not found (searched for {spec})",)
+            Self::NotFound(spec, detail) => {
+                write!(f, "package not found: {detail} (searching for {spec})",)
             }
-            Self::VersionNotFound(spec, latest) => {
+            Self::VersionNotFound(spec, latest, registry) => {
                 write!(
                     f,
-                    "package found, but version {} does not exist (latest is {})",
-                    spec.version, latest,
-                )
+                    "package '{}' found, but version {} does not exist",
+                    spec.name, spec.version
+                )?;
+                if let Some(version) = latest {
+                    write!(f, " (latest version provided by {registry} is {version})")
+                } else {
+                    write!(f, " ({registry} contains no versions for this package)")
+                }
             }
             Self::NetworkFailed(Some(err)) => {
                 write!(f, "failed to download package ({err})")

crates/typst-svg/src/lib.rs

@@ -45,6 +45,30 @@ pub fn svg_frame(frame: &Frame) -> String {
     renderer.finalize()
 }
 
+/// Export a frame into an SVG suitable for embedding into HTML.
+#[typst_macros::time(name = "svg html frame")]
+pub fn svg_html_frame(frame: &Frame, text_size: Abs) -> String {
+    let mut renderer = SVGRenderer::with_options(xmlwriter::Options {
+        indent: xmlwriter::Indent::None,
+        ..Default::default()
+    });
+    renderer.write_header_with_custom_attrs(frame.size(), |xml| {
+        xml.write_attribute("class", "typst-frame");
+        xml.write_attribute_fmt(
+            "style",
+            format_args!(
+                "overflow: visible; width: {}em; height: {}em;",
+                frame.width() / text_size,
+                frame.height() / text_size,
+            ),
+        );
+    });
+
+    let state = State::new(frame.size(), Transform::identity());
+    renderer.render_frame(state, Transform::identity(), frame);
+    renderer.finalize()
+}
+
 /// Export a document with potentially multiple pages into a single SVG file.
 ///
 /// The padding will be added around and between the individual frames.
@@ -158,8 +182,13 @@ impl State {
 impl SVGRenderer {
     /// Create a new SVG renderer with empty glyph and clip path.
     fn new() -> Self {
+        Self::with_options(Default::default())
+    }
+
+    /// Create a new SVG renderer with the given configuration.
+    fn with_options(options: xmlwriter::Options) -> Self {
         SVGRenderer {
-            xml: XmlWriter::new(xmlwriter::Options::default()),
+            xml: XmlWriter::new(options),
             glyphs: Deduplicator::new('g'),
             clip_paths: Deduplicator::new('c'),
             gradient_refs: Deduplicator::new('g'),
@@ -170,11 +199,22 @@ impl SVGRenderer {
         }
     }
 
-    /// Write the SVG header, including the `viewBox` and `width` and `height`
-    /// attributes.
+    /// Write the default SVG header, including a `typst-doc` class, the
+    /// `viewBox` and `width` and `height` attributes.
     fn write_header(&mut self, size: Size) {
+        self.write_header_with_custom_attrs(size, |xml| {
+            xml.write_attribute("class", "typst-doc");
+        });
+    }
+
+    /// Write the SVG header with additional attributes and standard attributes.
+    fn write_header_with_custom_attrs(
+        &mut self,
+        size: Size,
+        write_custom_attrs: impl FnOnce(&mut XmlWriter),
+    ) {
         self.xml.start_element("svg");
-        self.xml.write_attribute("class", "typst-doc");
+        write_custom_attrs(&mut self.xml);
         self.xml.write_attribute_fmt(
             "viewBox",
             format_args!("0 0 {} {}", size.x.to_pt(), size.y.to_pt()),

crates/typst/src/lib.rs

@@ -191,7 +191,7 @@ fn hint_invalid_main_file(
     file_error: FileError,
     input: FileId,
 ) -> EcoVec<SourceDiagnostic> {
-    let is_utf8_error = matches!(file_error, FileError::InvalidUtf8);
+    let is_utf8_error = matches!(file_error, FileError::InvalidUtf8(_));
     let mut diagnostic =
         SourceDiagnostic::error(Span::detached(), EcoString::from(file_error));
 

tests/ref/html/html-frame.html

@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+  </head>
+  <body>
+    <p>A rectangle:</p>
+    <svg class="typst-frame" style="overflow: visible; width: 4.5em; height: 3em;" viewBox="0 0 45 30" width="45pt" height="30pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:h5="http://www.w3.org/1999/xhtml"><g><g transform="translate(-0 -0)"><path class="typst-shape" fill="none" stroke="#000000" stroke-width="1" stroke-linecap="butt" stroke-linejoin="miter" stroke-miterlimit="4" d="M 0 0 L 0 30 L 45 30 L 45 0 Z "/></g></g></svg>
+  </body>
+</html>

tests/src/world.rs

@@ -172,7 +172,9 @@ pub(crate) fn system_path(id: FileId) -> FileResult<PathBuf> {
         None => PathBuf::new(),
     };
 
-    id.vpath().resolve(&root).ok_or(FileError::AccessDenied)
+    id.vpath()
+        .resolve(&root)
+        .ok_or_else(|| FileError::AccessDenied(id.vpath().as_rootless_path().into()))
 }
 
 /// Read a file.
@@ -186,7 +188,7 @@ pub(crate) fn read(path: &Path) -> FileResult<Cow<'static, [u8]>> {
 
     let f = |e| FileError::from_io(e, path);
     if fs::metadata(path).map_err(f)?.is_dir() {
-        Err(FileError::IsDirectory)
+        Err(FileError::IsDirectory(path.into()))
     } else {
         fs::read(path).map(Cow::Owned).map_err(f)
     }

tests/suite/html/frame.typ

@@ -1,5 +1,6 @@
-// No proper HTML tests here yet because we don't want to test SVG export just
-// yet. We'll definitely add tests at some point.
+--- html-frame html ---
+A rectangle:
+#html.frame(rect())
 
 --- html-frame-in-layout ---
 // Ensure that HTML frames are transparent in layout. This is less important for

tests/suite/scripting/import.typ

@@ -302,11 +302,11 @@
 #import 5 as x
 
 --- import-from-string-invalid ---
-// Error: 9-11 failed to load file (is a directory)
+// Error: 9-11 failed to load file tests/suite/scripting (is a directory)
 #import "": name
 
 --- import-from-string-renamed-invalid ---
-// Error: 9-11 failed to load file (is a directory)
+// Error: 9-11 failed to load file tests/suite/scripting (is a directory)
 #import "" as x
 
 --- import-file-not-found-invalid ---
@@ -483,3 +483,4 @@ This is never reached.
 --- import-from-file-package-lookalike ---
 // Error: 9-28 file not found (searched at tests/suite/scripting/#test/mypkg:1.0.0)
 #import "#test/mypkg:1.0.0": *
+