generated API reference with DocFX #337

.config/dotnet-tools.json

@@ -0,0 +1,13 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "docfx": {
+      "version": "2.81.0",
+      "commands": [
+        "docfx"
+      ],
+      "rollForward": false
+    }
+  }
+}

.github/workflows/build.yaml

@@ -58,6 +58,14 @@ jobs:
         run: |
             dotnet test ./src/log4net.sln
 
+      # Recompiles both shipping projects through docfx with warnings as errors, so a broken doc
+      # comment or cref fails the pull request rather than the release build. The script itself
+      # is covered on all three runners by the Pester suite below; the real docfx run needs one.
+      - name: API reference
+        if: matrix.os == 'ubuntu-latest'
+        shell: pwsh
+        run: ./scripts/build-api-docs.ps1
+
       # Pester 5.9 ships on all three runner images, so nothing is installed here.
       - name: Release script tests
         shell: pwsh

.gitignore

@@ -218,6 +218,10 @@ _Pvt_Extensions
 # Maven target dir created during site build
 target
 
+# Metadata generated by scripts/build-api-docs.ps1
+/src/site/docfx/log4net/
+/src/site/docfx/log4net.Ext.Mail/
+
 # other files to ignore
 old-log4net.snk
 src/GeneratedAssemblyInfo.cs

AGENTS.md

@@ -256,15 +256,28 @@ The manual lives in `src/site/antora/modules/ROOT/pages/`. A new appender page n
 not one: the page itself, an `xref` line in `nav.adoc` (kept alphabetical), and the appender table
 in `manual/configuration/appenders.adoc`.
 
+The API reference is DocFX output from the XML doc comments, built by `scripts/build-api-docs.ps1`
+into `target/site/api` and in CI with warnings as errors, so an unresolved `cref` or a missing
+public doc comment fails the PR. The configuration is in `src/site/docfx/`; the `log4net` and
+`log4net.Ext.Mail` folders generated there are ignored. `log4net` is documented as `net462`, since
+the `NET462_OR_GREATER` types exist only there. The Ext.Mail entry sets `ProduceReferenceAssembly`,
+without which Roslyn cannot match its project reference to log4net and warns.
+
 ## Release scripts
 
+- **Before writing a helper function in a script, grep `scripts/` for its name and its idiom**
+  (`Push-Location`, `Remove-Item`, `Get-Date`). A function two scripts need lives in
+  `scripts/Common.psm1`, imported with `Import-Module $PSScriptRoot/Common.psm1 -Force`, not
+  copied into the second script. A module takes its preferences from the global scope, so the
+  module sets `$ErrorActionPreference` itself.
 - **Every file `build-release.ps1` writes gets LF on every platform.** `Set-Content` writes
   `[Environment]::NewLine`; use `-NoNewline` with the lines joined by `` `n ``. A CR is invisible in
   an editor, and `sha512sum` on macOS reads it as part of the file name.
 - **Each release ships the verifier built with it**, so never add backward compatibility to
   `verify-release.ps1` or `.sh`: a compatibility skip path is a hole, not a courtesy.
 - The scripts are tested with Pester through `scripts/FakeCommands.TestHelper.ps1`, which shadows
-  `dotnet`, `git`, `gpg`, `zip` and `mvnw` with shims on a prepended `PATH`, because Pester `Mock`
+  `dotnet`, `git`, `gpg`, `zip`, `mvnw` and `curl` with shims on a prepended `PATH` (`FAKE_FAIL` names a
+  command, or a command and its first argument such as `dotnet docfx`), because Pester `Mock`
   intercepts only functions and cmdlets. CI runs the suite on macOS, Ubuntu and Windows, so keep
   the helper's `$IsWindows` branch working and put byte-level assertions where all three see them.
 

antora-playbook.yaml

@@ -115,6 +115,9 @@ ui:
               <img src="{{{uiRootPath}}}/../_images/log4net.svg" alt="Apache log4net"/>
             </div>
             <div id="topbar-nav" class="navbar-menu">
+              <div class="navbar-end">
+                <a class="navbar-item" href="{{{siteRootPath}}}/api/index.html">API Reference</a>
+              </div>
               <div class="navbar-end">
                 <a class="navbar-item" href="https://github.com/apache/logging-log4net">GitHub</a>
               </div>

doc/BUILDING.md

@@ -67,3 +67,19 @@ be pushed to the `asf-staging` branch of [https://github.com/apache/logging-log4
 
 Once the site has been pushed to the `asf-staging` branch, it can be viewed at
 [http://logging.staged.apache.org/log4net](http://logging.staged.apache.org/log4net)
+
+### API reference
+
+The API reference under `target/site/api` is generated by [DocFX](https://dotnet.github.io/docfx/)
+from the XML documentation comments of `src/log4net` and `src/log4net.Ext.Mail`:
+
+```
+./scripts/build-api-docs.ps1
+```
+
+`scripts/build-release.ps1` runs it after the site, since it removes `target/` before `./mvnw site`.
+The script restores the docfx version pinned in `.config/dotnet-tools.json` and builds
+with warnings as errors, so an unresolved `cref` or an undocumented public member fails it, as it
+does in CI. The page titles name the `VersionPrefix` of `src/Directory.Build.props`, or the
+`-Version` given. The configuration lives in `src/site/docfx/docfx.json`. `log4net` is documented as
+`net462`, the larger of its two surfaces: the event log and ASP.NET types exist only there.

doc/RELEASING.md

@@ -23,6 +23,7 @@ release version 3.2.1:
                     - people who suggested code that was implemented
 2. Build release artifacts with `scripts/build-release.ps1`
    - the scripts works on Linux and Windows
+   - it also builds the API reference into `target/site/api`, restoring docfx from nuget.org first
    - Prerequisites
      - PowerShell
        - https://learn.microsoft.com/en-us/powershell/scripting/install/installing-powershell-on-windows
@@ -31,7 +32,7 @@ release version 3.2.1:
 3. Clone out the log4net doc repo (https://github.com/apache/logging-log4net-site)
     - check out the `asf-staging` branch
     - create a folder which includes the version, eg `log4net-3.2.1`
-4. Copy the contents of `target/site` from this repo into the folder created in (4)
+4. Copy the contents of `target/site` from this repo into the folder created in (3)
 5. Update the symlinks in the base of the docs repo, ie:
     - 3.2.x -> 3.2.1
     - 3.x -> 3.2.1

rat.excludesFile

@@ -11,6 +11,7 @@ rat.excludesFile
 **/*.txt
 **/*.sh
 **/*.ps1
+**/*.psm1
 **/*.xml
 **/*.props
 **/*.csproj

scripts/Common.psm1

@@ -0,0 +1,64 @@
+#Requires -Version 7.4
+
+<#
+.SYNOPSIS
+  Shared by the build scripts, which import it.
+#>
+
+Set-StrictMode -Version Latest
+# A module takes its preferences from the global scope, not from the importing script, so
+# without this a failed delete below would be reported and ignored.
+$ErrorActionPreference = 'Stop'
+
+# Paired, so a throw inside cannot leave the caller in the wrong directory.
+function Invoke-InDirectory
+{
+  param
+  (
+    [Parameter(Mandatory=$true, HelpMessage='The directory to run in.')]
+    [string]$Directory,
+    [Parameter(Mandatory=$true, HelpMessage='What to run there.')]
+    [scriptblock]$Action
+  )
+
+  Push-Location $Directory
+  try
+  {
+    & $Action
+  }
+  finally
+  {
+    Pop-Location
+  }
+}
+
+# Tested rather than silenced: -ErrorAction SilentlyContinue would also swallow a delete that
+# failed, leaving a stale artifact or page behind for whoever copies the directory.
+function Remove-Directory
+{
+  param
+  (
+    [Parameter(Mandatory=$true, HelpMessage='The directory to remove if it exists.')]
+    [string]$Directory
+  )
+
+  if (Test-Path $Directory)
+  {
+    Remove-Item $Directory -Force -Recurse
+  }
+}
+
+# The Antora footer from antora-playbook.yaml, with the year computed as it is there, since
+# docfx has no year variable. Passed on the command line, so docfx.json never goes stale.
+function Get-ApiDocsFooter
+{
+  @"
+Copyright &copy; 2007-$((Get-Date).Year) <a href="https://www.apache.org/">The Apache Software Foundation</a>.
+Licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache Software License, Version 2.0</a>.
+Please read our <a href="https://privacy.apache.org/policies/privacy-policy-public.html">privacy policy</a>.
+<br/>Apache, log4net, and the Apache logo are trademarks or registered trademarks of The Apache Software Foundation.
+Other names may be trademarks of their respective owners.
+"@ -replace "`r?`n", ' '
+}
+
+Export-ModuleMember -Function Invoke-InDirectory, Remove-Directory, Get-ApiDocsFooter

scripts/FakeCommands.TestHelper.ps1

@@ -12,13 +12,16 @@
 # The commit the fake "git rev-parse" reports, so a test can assert what was archived and recorded.
 $script:FakeCommitHash = 'a1b2c3d4e5f6071829a3b4c5d6e7f80912345678'
 
-# Logs its call, fails when named in FAKE_FAIL, and otherwise writes the files the real command
-# would, where it is told to, so a wrong output path fails as it would for real. "git status" and
-# "git rev-parse" answer on stdout instead, FAKE_DIRTY faking an unclean tree.
+# Logs its call, fails when named in FAKE_FAIL (by command, or by command and first argument, as
+# in "dotnet docfx"), and otherwise writes the files the real command would, where it is told to,
+# so a wrong output path fails as it would for real. "git status" and "git rev-parse" answer on
+# stdout instead, FAKE_DIRTY faking an unclean tree and FAKE_NO_OUTPUT a docfx that wrote nothing.
+# "curl -o" writes a package with an assembly and its xml for every framework a script may look
+# for, and "dotnet docfx" its index.html at the -o base, or at target/site/api without one.
 $script:FakeCommand = @'
 param([string]$Name)
 Add-Content -Path $env:FAKE_LOG -Value "$Name $($args -join ' ')"
-if ($env:FAKE_FAIL -eq $Name) { exit 1 }
+if ($env:FAKE_FAIL -in $Name, "$Name $($args[0])") { exit 1 }
 if ($Name -eq 'git')
 {
   switch ($args[0])
@@ -31,29 +34,65 @@ $outputs = switch ($Name)
 {
   'dotnet'
   {
-    $version = ($args -join ' ') -replace '.*PackageVersion=(\S+).*', '$1'
-    $build = "$(Split-Path $PSScriptRoot)/build"
-    "$build/artifacts/log4net.$version.nupkg", "$build/artifacts/log4net.Ext.Mail.$version.nupkg", "$build/Release/net462/log4net.dll"
+    $root = Split-Path $PSScriptRoot
+    switch ($args[0])
+    {
+      'tool' { }
+      'docfx'
+      {
+        $base = $args.IndexOf('-o') -ge 0 ? $args[$args.IndexOf('-o') + 1] : "$root/target/site/api"
+        if (!$env:FAKE_NO_OUTPUT) { "$base/index.html" }
+      }
+      default
+      {
+        $version = ($args -join ' ') -replace '.*PackageVersion=(\S+).*', '$1'
+        "$root/build/artifacts/log4net.$version.nupkg", "$root/build/artifacts/log4net.Ext.Mail.$version.nupkg", "$root/build/Release/net462/log4net.dll"
+      }
+    }
   }
   'git' { if ($args[0] -eq 'archive') { $args[$args.IndexOf('--output') + 1] } }
   'zip' { $args[1] }
+  'curl'
+  {
+    $package = New-Item -ItemType Directory -Path (Join-Path ([IO.Path]::GetTempPath()) ([guid]::NewGuid()))
+    foreach ($lib in 'net462', 'netstandard2.0')
+    {
+      foreach ($file in 'log4net.dll', 'log4net.xml', 'log4net.Ext.Mail.dll', 'log4net.Ext.Mail.xml')
+      {
+        New-Item -ItemType File -Force -Path (Join-Path $package 'lib' $lib $file) | Out-Null
+      }
+    }
+    Compress-Archive -Path (Join-Path $package 'lib') -DestinationPath $args[$args.IndexOf('-o') + 1] -Force
+    Remove-Item $package -Recurse -Force
+  }
 }
 $outputs | ForEach-Object { New-Item -ItemType File -Force -Path $_ | Out-Null }
 '@
 
 function New-ScratchTree
 {
-  param ([Parameter(Mandatory)][string]$Script)
+  param ([Parameter(Mandatory, HelpMessage='The script under test, relative to scripts/.')][string]$Script)
 
   $root = New-Item -ItemType Directory -Path (Join-Path ([System.IO.Path]::GetTempPath()) ([guid]::NewGuid()))
   $scripts = New-Item -ItemType Directory -Path (Join-Path $root 'scripts')
   $bin = New-Item -ItemType Directory -Path (Join-Path $root 'fakebin')
-  Copy-Item (Join-Path $PSScriptRoot $Script) $scripts
+  # The script keeps its place under scripts/, as the paths it derives from its own depend on it.
+  $target = Join-Path $scripts $Script
+  New-Item -ItemType Directory -Path (Split-Path $target) -Force | Out-Null
+  Copy-Item (Join-Path $PSScriptRoot $Script) $target
   Copy-Item (Join-Path $PSScriptRoot 'verify-release.*') $scripts
+  # build-release.ps1 calls it by path, and the build scripts import Common.psm1.
+  Copy-Item (Join-Path $PSScriptRoot 'build-api-docs.ps1') $scripts
+  Copy-Item (Join-Path $PSScriptRoot 'Common.psm1') $scripts
+  # The version build-api-docs.ps1 names in its titles.
+  Set-Content -Path (New-Item -ItemType File -Force -Path (Join-Path $root 'src' 'Directory.Build.props')) -Value '<Project><PropertyGroup><VersionPrefix>9.9.9</VersionPrefix></PropertyGroup></Project>'
+  # The shared docfx sources the old-version script copies.
+  Copy-Item (Join-Path $PSScriptRoot '..' 'src' 'site' 'docfx' 'logo.svg') (New-Item -ItemType Directory -Path (Join-Path $root 'src' 'site' 'docfx'))
+  New-Item -ItemType Directory -Path (Join-Path $root 'src' 'site' 'docfx' 'template') | Out-Null
   'license' | Set-Content (Join-Path $root 'LICENSE')
   'notice' | Set-Content (Join-Path $root 'NOTICE')
   Set-Content -Path (Join-Path $bin 'fake.ps1') -Value $script:FakeCommand
-  foreach ($name in 'dotnet', 'git', 'gpg', 'zip', 'mvnw')
+  foreach ($name in 'dotnet', 'git', 'gpg', 'zip', 'mvnw', 'curl')
   {
     # mvnw is called by path from the root, the others through PATH.
     $directory = $name -eq 'mvnw' ? $root : $bin
@@ -74,7 +113,7 @@ function New-ScratchTree
 function Invoke-InScratchTree
 {
   param ([Parameter(Mandatory)][string]$Root, [Parameter(Mandatory)][string]$Script, [string]$Fail,
-    [switch]$Dirty)
+    [switch]$Dirty, [switch]$NoOutput, [string[]]$Arguments = @())
 
   $log = Join-Path $Root 'calls.log'
   New-Item -ItemType File -Path $log -Force | Out-Null
@@ -86,14 +125,15 @@ function Invoke-InScratchTree
     $env:FAKE_FAIL = $Fail
     $env:FAKE_SHA = $script:FakeCommitHash
     $env:FAKE_DIRTY = $Dirty ? '1' : ''
+    $env:FAKE_NO_OUTPUT = $NoOutput ? '1' : ''
     # NonInteractive makes the confirmation pause throw, standing in for a release manager who says no.
-    $output = pwsh -NoProfile -NonInteractive -File (Join-Path $Root 'scripts' $Script) 2>&1
+    $output = pwsh -NoProfile -NonInteractive -File (Join-Path $Root 'scripts' $Script) @Arguments 2>&1
     $exitCode = $LASTEXITCODE
   }
   finally
   {
     $env:PATH = $path
-    Remove-Item Env:FAKE_LOG, Env:FAKE_FAIL, Env:FAKE_SHA, Env:FAKE_DIRTY -ErrorAction SilentlyContinue
+    Remove-Item Env:FAKE_LOG, Env:FAKE_FAIL, Env:FAKE_SHA, Env:FAKE_DIRTY, Env:FAKE_NO_OUTPUT -ErrorAction SilentlyContinue
   }
   return [pscustomobject]@{
     ExitCode = $exitCode