Remove Claude/Codex attribution blocks and Claude-Session lines

Co-author cleanup now removes a Claude or Codex Co-authored-by line
together with the non-blank lines that follow it, removes any
Claude-Session trailer line, and collapses the blank lines left behind.
Other Co-authored-by lines are still removed individually.

README.md

@@ -13,7 +13,7 @@ Repository: https://github.com/andydixon/nexus
   - committer name, email, and date/time
   - full commit message
 - Keyboard-driven calendar and time picker for author and committer timestamps
-- Opt-in bulk removal of `Co-authored-by:` trailer lines across commit messages
+- Opt-in bulk removal of `Co-authored-by:` and `Claude-Session:` lines across commit messages; Claude and Codex attribution blocks are removed whole
 - Search commits by hash, message, author name, or email
 - Bulk replace author names and emails using case-insensitive partial or exact matching
 - Track edited commits and reset the selected commit
@@ -31,7 +31,7 @@ Repository: https://github.com/andydixon/nexus
 - `r`: reload history
 - `x`: reset the selected commit
 - `a`: apply changes
-- `c`: toggle bulk removal of `Co-authored-by:` lines
+- `c`: toggle bulk removal of `Co-authored-by:` trailers and `Claude-Session:` lines
 - `f`: toggle force push
 - `t`: toggle tag push
 - `?`: show help

app.go

@@ -529,21 +529,35 @@ func formatGitDate(value time.Time) string {
 }
 
 var coAuthorLinePattern = regexp.MustCompile(`(?i)^\s*co-authored(?:-|\s+)by\s*:`)
+var aiAttributionPattern = regexp.MustCompile(`(?i)^\s*co-authored(?:-|\s+)by\s*:.*\b(claude|codex)\b`)
 
+// removeCoAuthorLines drops Co-authored-by trailer lines and Claude-Session:
+// lines. A Claude or Codex co-author line also takes the contiguous non-blank
+// lines that follow it (its attribution block). Returns the number of lines removed.
 func removeCoAuthorLines(message string) (string, int) {
 	lines := strings.Split(strings.ReplaceAll(message, "\r\n", "\n"), "\n")
 	kept := make([]string, 0, len(lines))
 	removed := 0
+	inBlock := false
 	for _, line := range lines {
-		if coAuthorLinePattern.MatchString(line) {
-			removed++
+		switch {
+		case aiAttributionPattern.MatchString(line):
+			inBlock = true
+		case inBlock && strings.TrimSpace(line) != "":
+		case coAuthorLinePattern.MatchString(line), strings.Contains(strings.ToLower(line), "claude-session:"):
+			inBlock = false
+		default:
+			inBlock = false
+			kept = append(kept, line)
 			continue
 		}
-		kept = append(kept, line)
+		removed++
 	}
-	return normalizeMessage(strings.Join(kept, "\n")), removed
+	return normalizeMessage(blankRunPattern.ReplaceAllString(strings.Join(kept, "\n"), "\n\n")), removed
 }
 
+var blankRunPattern = regexp.MustCompile(`\n(?:[ \t]*\n){2,}`)
+
 func editableFieldsChanged(current CommitRecord, incoming CommitRecord) bool {
 	return current.AuthorName != incoming.AuthorName ||
 		current.AuthorEmail != incoming.AuthorEmail ||

app_apply_test.go

@@ -178,6 +178,17 @@ func TestApplyChangesUpdatesDatesAndRemovesCoAuthorTrailers(t *testing.T) {
 	}
 }
 
+func TestRemoveCoAuthorLinesDropsAIAttributionBlocks(t *testing.T) {
+	message := "subject\n\nClaude-Session: https://example.com/a\nbody\n\nCo-authored-by: Ada <ada@example.com>\nSigned-off-by: Bob <bob@example.com>\n\nCo-Authored-By: Claude Opus 5 <noreply@anthropic.com>\nClaude-Session: https://example.com/b\nSomething else\n\nCo-authored-by: Codex <codex@openai.com>\nGenerated by Codex\n\ntail"
+	cleaned, removed := removeCoAuthorLines(message)
+	if removed != 7 {
+		t.Fatalf("expected seven removed lines, got %d", removed)
+	}
+	if cleaned != "subject\n\nbody\n\nSigned-off-by: Bob <bob@example.com>\n\ntail" {
+		t.Fatalf("unexpected cleaned message: %q", cleaned)
+	}
+}
+
 func TestRemoveCoAuthorLinesOnlyMatchesWholeTrailerLines(t *testing.T) {
 	message := "subject\r\n\r\nCo-authored-by: Ada <ada@example.com>\r\n  CO-AUTHORED BY: Grace <grace@example.com>\r\nNote: Co-authored-by: this is prose"
 	cleaned, removed := removeCoAuthorLines(message)

edit.sh

@@ -10,7 +10,7 @@ Usage:
 
 What it does:
   - Rewrites reachable Git history in the current repository.
-  - Removes lines starting with "Co-Authored" from commit messages.
+  - Removes "Co-Authored" and "Claude-Session:" lines; Claude/Codex co-author blocks are removed whole.
   - Sets author and committer name/email to the values you provide.
   - Moves commit times to either:
       00:00-07:30
@@ -166,15 +166,21 @@ PY
 
 # Write the message callback.
 cat >"${MESSAGE_CALLBACK_FILE}" <<'PY'
-# Remove any line that starts with "Co-Authored", case-insensitively.
+# Remove Claude/Codex co-author lines together with the non-blank lines that
+# follow them, then any other "Co-Authored" or "Claude-Session:" lines.
 message = re.sub(
-    br'(?im)^[ \t]*Co-Authored[^\r\n]*(?:\r?\n|$)',
+    br'(?im)^[ \t]*Co-Authored[^\r\n]*\b(?:claude|codex)\b[^\r\n]*(?:\r?\n[^\r\n]+)*(?:\r?\n|$)',
+    b'',
+    message,
+)
+message = re.sub(
+    br'(?im)^(?:[ \t]*Co-Authored|[^\r\n]*Claude-Session:)[^\r\n]*(?:\r?\n|$)',
     b'',
     message,
 )
 
-# Trim excessive blank lines from the end of the message.
-message = re.sub(br'(?:\r?\n){3,}$', b'\n\n', message)
+# Collapse runs of blank lines left behind and trim the end of the message.
+message = re.sub(br'(?:\r?\n){3,}', b'\n\n', message)
 
 # Return the rewritten message bytes.
 return message