FSharp.Formatting 23.0.0-alpha.1

• .NETStandard 2.1

  • FSharp.Compiler.Service (= 43.12.204)

### Changed

- Links are relative. The `{{root}}` substitution is now the path from the page to the root of the site (`./`, `../`, ...) instead of the absolute site URL, so the generated site works from any host name or sub path, from the file system, and `fsdocs watch` can be reached through any address the server is bound to (`--host 0.0.0.0`, a Codespaces forward, a reverse proxy). The `--root` option of `watch` is replaced by `--site-root`, which only sets the site URL. The search index holds site-relative URIs that the search script prefixes with the page's root. The absolute URL of the site is available as the new `{{fsdocs-site-root}}` substitution (from `<PackageProjectUrl>` or `--parameters fsdocs-site-root`; a `root` parameter still sets it but warns); the default template uses it for `og:url` and `twitter:site`, and `llms.txt` links stay absolute. Custom templates that use `{{root}}` in metadata that must be absolute should switch to `{{fsdocs-site-root}}`. Notebook, script and LaTeX outputs keep the absolute site URL since they are used outside the site. The dev server serves a folder URL from its index page and redirects `/folder` to `/folder/`, as static web servers do.
- `fsdocs watch` is a lazy dev server: no output folder is written, a page is built the first time it is requested and cached until a file that influences it changes (content hashes, so byte-identical rewrites invalidate nothing), static files are served from their source location, and a failing page returns a `500` while the other pages keep working. The search index is fetched when the search dialog is first opened instead of on page load. New diagnostic pages at `/.fsdocs/doctor` and `/.fsdocs/doctor.json` show the cracked projects, substitutions, templates, navigation titles, routes and cache state. `--output`, `--clean` and `--saveimages` are ignored by `watch`.
- Project cracking evaluates the MSBuild properties of each project with `dotnet msbuild --getProperty` (in parallel, no design-time build) and drops test projects and executables before any expensive work. The compiler references come from a design-time build (`dotnet msbuild -t:...CoreCompile -getItem:FscCommandLineArgs`, one process per project, in parallel) that runs only for the documented projects and only when the API docs are generated; it is cached in `.fsdocs/references`. Ionide.ProjInfo is no longer used for the design-time build, only to read solution files. The `.fsdocs/cache` key now covers the discovered project files, `Directory.Build.props`, `Directory.Build.targets`, `Directory.Packages.props` and `global.json`, so editing those no longer serves stale project settings.
- Properties set by MSBuild targets, such as a `Version` computed from a changelog by `Ionide.KeepAChangelog.Tasks`, are not visible to an evaluation. The substitutions are therefore recomputed from the design-time build when it runs: `build` uses the refined values for the API docs and the content, `watch` serves the evaluated values until the design-time build ran (at startup, in the background) and then rebuilds the affected pages. The doctor shows per project whether the design-time build ran, which substitutions it changed, and has a button to run it again.
- `TypeConstraintDisplayMode` is a struct discriminated union, as the Ionide analyzers suggest. Source compatible, but the compiled representation changes, so a consumer needs to recompile.
- Rewrote the Mermaid documentation recipe as `docs/mermaid.md` (moved from the oddly-named `docs/sidebyside/sidemermaid.md`) to follow the approach used by the fantomas docs: diagrams are written as plain ```mermaid fenced code blocks, which GitHub renders natively, and an `_body.html` script promotes those blocks into `<div class="mermaid">` elements on fsdocs pages. The FSharp.Formatting docs now ship that script (`docs/_body.html`), so the recipe page actually demonstrates working diagrams.
- Bump `Ionide.ProjInfo` from 0.74.2 to 0.75.0 and `NUnit3TestAdapter` from 6.2.0 to 6.3.0. Both are routine, non-breaking updates.
- Replace `sprintf "<pre><code>"` (a format string with no format arguments) with the plain string literal `"<pre><code>"` in `HtmlFormatting.fs`. This is on the hot path invoked once per rendered code/output block, and avoids the unnecessary printf-format parsing overhead for a string with no substitutions.

### Added

- Logging goes through `Microsoft.Extensions.Logging`. The libraries are silent by default; hosts set `FSharp.Formatting.Common.Logging.LoggerFactory` or call `Logging.UseConsole(level)`. The tool has `-v`/`--verbosity quietminimalnormaldetaileddiagnostic` on `build`, `watch`, `convert` and `init`; `normal` prints one line per phase with counts and durations instead of one line per file, warnings and errors go to standard error with a `warning:`/`error:` prefix, and the doctor shows the last log lines.
- `fsdocs watch` builds the API reference in the background at startup and after a project DLL or project file change, so no page request waits for it. Project files and the solution-wide MSBuild files are watched: a change re-cracks the projects, so substitutions such as `<FsDocsLogoSource>` and the compiler references are picked up without a restart.
- `fsdocs watch --host 0.0.0.0` binds the server to all interfaces so the site can be browsed from another machine on the network.
- Support top-level `<seealso cref="..."/>` XML doc tags in API documentation generation. Per the [xmldoc recommended tags](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/xmldoc/recommended-tags#seealso), `<seealso>` is a top-level section (unlike the inline `<see>` tag) and is now rendered as a "See also" list in both HTML and Markdown API doc output, for both members and entities. [#1256](https://github.com/fsprojects/FSharp.Formatting/issues/1256)

### Fixed

- Surface FSI evaluation failures to stderr by default in `FsiEvaluator`. Previously, when a code snippet failed during `--eval`, the error was silently discarded unless the caller subscribed to `EvaluationFailed` or provided an `onError` callback. Now a concise error message (file name + stderr output) is always written to stderr, making failures visible in `fsdocs` output.
- Fix `FrontMatterFile.ParseFromLines` truncating front-matter values that contain a `:` character (e.g. `title: F#: An Introduction` was previously captured as just `F#`). Additional colons in a value are now preserved.

### Removed

- Remove the `--noserver` option of `fsdocs watch`; watching without serving no longer does anything now that no output folder is written.