git trailer sketch

Pwsh/Git/ParsingGitTrailers.ps1

@@ -0,0 +1,76 @@
+using namespace System.Collections.Generic
+
+$sampleCommit = @'
+subject
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit.
+
+Signed-off-by: Alice <[email protected]>
+resolved: crisis 314
+Signed-off-by: Bob <[email protected]>
+'@
+
+function Parse-CommitTrailer {
+    <#
+    .NOTES
+        trailers can use duplicate key names, see: <https://git-scm.com/docs/git-interpret-trailers>
+    #>
+    [CmdletBinding()]
+    param( $CommitMessage )
+
+    [List[Object]]$GitArgs = @(
+        'interpret-trailers'
+        '--parse'
+    )
+    $GitArgs
+        | Join-String -sep ' ' -op 'Invoking GitArgs: '
+        | write-verbose
+
+    [List[Object]]$trailerList = @(
+        $CommitMessage
+            # | CountOf 'orig line count'
+            | git @gitArgs
+            # | CountOf 'after interpret-trailer'
+            | %{
+                $delim = ': '
+                $Key, $Remaining = $_ -split $Delim, 2
+
+                [PSCustomObject]@{
+                    PSTypeName = 'test.Git.Trailer.KeyCollectionElement'
+                    Key = $Key
+                    Value = $Remaining
+                }
+            }
+    )
+    return [pscustomobject]@{
+        PSTypeName = 'test.Git.ParsedCommit.Record'
+        KeyCollection = $trailerList
+        RawMessage = $CommitMessage
+        ShortKeys = $trailerList | Group-Object Key
+            | %{
+                $_.Group | % Value | Join-string -f "`n    {0}" -op $_.Name
+            }
+    }
+}
+
+'original'
+    | Microsoft.PowerShell.Utility\Write-Host -fore blue
+
+$sampleCommit
+
+'parsed'
+    | Microsoft.PowerShell.Utility\Write-Host -fore blue
+
+( $Parsed = Parse-CommitTrailer $sampleCommit )  | ConvertTo-Json
+$Parsed.KeyCollection | Format-Table -AutoSize
+$Parsed | Format-List
+
+'render shared as collapsed'
+$Parsed.ShortKeys
+#     | Microsoft.PowerShell.Utility\Write-Host -fore blue
+
+# $Items = $parsed.KeyCollection
+# $items | Group-Object Key | %{
+#     $_.Group | % Value | Join-string -f "`n    {0}" -op $_.Name
+# }
+