feat: auto-name sessions from first prompt

2026-10-07 07:59:42 +02:00 · 2026-09-03 18:14:29 +08:00
parent 1e24817b51
commit 268e4819ff
9 changed files with 229 additions and 7 deletions
@@ -0,0 +1,101 @@
+/**
+ * Helpers for assigning a useful default name after the first submitted prompt.
+ *
+ * This deliberately does not call an LLM: the prompt is already available at
+ * the input boundary, so a bounded local title is private, deterministic, and
+ * works for every CLI backend.
+ */
+
+const MAX_PROMPT_BUFFER_LENGTH = 8_192;
+const MAX_AUTO_NAME_CODE_POINTS = 72;
+
+/**
+ * Tracks terminal input until Enter is received. Terminal input arrives in
+ * arbitrary chunks, so this keeps only a small composer buffer and ignores
+ * navigation/control escape sequences.
+ */
+export class SubmittedPromptTracker {
+  private buffer = '';
+  private escapeSequence = '';
+
+  feed(data: string): string[] {
+    const submitted: string[] = [];
+
+    for (const character of data) {
+      if (this.escapeSequence) {
+        this.escapeSequence += character;
+        // CSI sequences end with a byte in the final-byte range.
+        const isCsiIntroducer = this.escapeSequence === '\x1b[' || this.escapeSequence === '\x1bO';
+        if (/[\x40-\x7e]/.test(character) && !isCsiIntroducer) {
+          const isBracketedPasteMarker = this.escapeSequence === '\x1b[200~' || this.escapeSequence === '\x1b[201~';
+          if (!isBracketedPasteMarker) this.buffer = '';
+          this.escapeSequence = '';
+        }
+        continue;
+      }
+
+      if (character === '\x1b') {
+        this.escapeSequence = character;
+        continue;
+      }
+
+      if (character === '\r' || character === '\n') {
+        const prompt = this.buffer.trim();
+        if (prompt) submitted.push(prompt);
+        this.buffer = '';
+        continue;
+      }
+
+      if (character === '\x08' || character === '\x7f') {
+        this.buffer = Array.from(this.buffer).slice(0, -1).join('');
+        continue;
+      }
+
+      const codePoint = character.codePointAt(0) ?? 0;
+      if (codePoint < 0x20 || codePoint === 0x7f) {
+        // Ctrl-C/Ctrl-U and cursor controls make the append-only buffer
+        // unreliable. The next printable text starts a fresh candidate.
+        this.buffer = '';
+        continue;
+      }
+
+      this.buffer += character;
+      if (this.buffer.length > MAX_PROMPT_BUFFER_LENGTH) {
+        this.buffer = this.buffer.slice(-MAX_PROMPT_BUFFER_LENGTH);
+      }
+    }
+
+    return submitted;
+  }
+}
+
+/**
+ * Converts a submitted prompt into a compact session title.
+ * Returns null for empty text and slash commands, which are usually controls
+ * such as /clear or /resume rather than the task the user wants to remember.
+ */
+export function deriveAutoSessionName(prompt: string): string | null {
+  // Terminal input can legitimately contain ANSI/control bytes; they are
+  // removed before the title is persisted or broadcast.
+  const normalized = prompt
+    // eslint-disable-next-line no-control-regex
+    .replace(/\x1b\[[0-?]*[ -/]*[@-~]/g, '')
+    // eslint-disable-next-line no-control-regex
+    .replace(/[\u0000-\u001f\u007f]/g, ' ')
+    .replace(/\s+/g, ' ')
+    .trim();
+  if (!normalized || normalized.startsWith('/')) return null;
+
+  const firstSentence = normalized.match(/^.*?(?:[.!?。！？](?:\s|$)|$)/)?.[0]?.trim() || normalized;
+  const codePoints = Array.from(firstSentence);
+  if (codePoints.length <= MAX_AUTO_NAME_CODE_POINTS) return firstSentence;
+  return `${codePoints
+    .slice(0, MAX_AUTO_NAME_CODE_POINTS - 1)
+    .join('')
+    .trimEnd()}…`;
+}
+
+/** Existing Codeman-generated tab names are safe to upgrade on first prompt. */
+export function isGeneratedSessionName(name: string): boolean {
+  return /^[ws]\d+-[a-zA-Z0-9_-]+$/.test(name);
+}