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fix: use raw stdout for SessionStart context injection #2

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fix: use raw stdout for SessionStart context injection #2

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1 change: 1 addition & 0 deletions hooks/hooks.json
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
],
"SessionStart": [
{
"matcher": "compact",
"hooks": [
{
"type": "command",
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54 changes: 31 additions & 23 deletions src/hook.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -52,7 +52,9 @@ export async function hookPreCompact(): Promise<void> {
if (!input.transcript_path)
throw new Error("no transcript_path in hook input");

log(`PreCompact triggered: trigger=${input.trigger} session=${input.session_id}`);
log(
`PreCompact triggered: trigger=${input.trigger} session=${input.session_id}`,
);

if (!(await Bun.file(input.transcript_path).exists())) {
throw new Error(`transcript not found: ${input.transcript_path}`);
Expand All @@ -73,19 +75,29 @@ export async function hookPreCompact(): Promise<void> {
try {
const messages = await parseTranscript(input.transcript_path);
const inputChars = messages.reduce((n, m) => n + m.content.length, 0);
log(`PreCompact: parsed ${messages.length} messages (${inputChars} chars), calling Morph API...`);
log(
`PreCompact: parsed ${messages.length} messages (${inputChars} chars), calling Morph API...`,
);

const start = performance.now();
const summary = await compact(messages);
const durationMs = Math.round(performance.now() - start);
const ratio = inputChars > 0 ? ((summary.length / inputChars) * 100).toFixed(1) : "N/A";
const ratio =
inputChars > 0 ? ((summary.length / inputChars) * 100).toFixed(1) : "N/A";

log(`PreCompact: compaction complete in ${durationMs}ms — ${inputChars} → ${summary.length} chars (${ratio}% ratio)`);
log(
`PreCompact: compaction complete in ${durationMs}ms — ${inputChars} → ${summary.length} chars (${ratio}% ratio)`,
);

const state: StateData = {
summary,
warn: input.trigger === "manual" && !input.custom_instructions,
stats: { messageCount: messages.length, inputChars, outputChars: summary.length, durationMs },
stats: {
messageCount: messages.length,
inputChars,
outputChars: summary.length,
durationMs,
},
};

await Bun.write(sf, JSON.stringify(state));
Expand All @@ -100,17 +112,6 @@ export async function hookPreCompact(): Promise<void> {
}
}

function emitContext(data: string): void {
console.log(
JSON.stringify({
hookSpecificOutput: {
hookEventName: "SessionStart",
additionalContext: data,
},
}),
);
}

export async function hookSessionStart(): Promise<void> {
const input = await readStdin<SessionStartInput>();
if (!input.session_id) throw new Error("no session_id in hook input");
Expand All @@ -125,13 +126,17 @@ export async function hookSessionStart(): Promise<void> {
}

const state = (await file.json()) as StateData;
log(`SessionStart: state=${JSON.stringify({ error: state.error, warn: state.warn, summaryLen: state.summary?.length ?? 0, stats: state.stats })}`);
log(
`SessionStart: state=${JSON.stringify({ error: state.error, warn: state.warn, summaryLen: state.summary?.length ?? 0, stats: state.stats })}`,
);

if (state.error) {
log(`SessionStart: injecting error — ${state.error}`);
emitContext(
"ERROR: Morph compaction failed: " + state.error + "\n" +
"Inform the user about this error. Context from the previous conversation was NOT preserved.",
process.stdout.write(
"ERROR: Morph compaction failed: " +
state.error +
"\n" +
"Inform the user about this error. Context from the previous conversation was NOT preserved.",
);
await unlink(sf).catch(() => {});
return;
Expand All @@ -154,12 +159,15 @@ export async function hookSessionStart(): Promise<void> {

if (state.stats) {
const { messageCount, inputChars, outputChars, durationMs } = state.stats;
const ratio = inputChars > 0 ? ((outputChars / inputChars) * 100).toFixed(1) : "N/A";
log(`SessionStart: injecting summary — ${messageCount} messages, ${inputChars} → ${outputChars} chars (${ratio}%), took ${durationMs}ms`);
const ratio =
inputChars > 0 ? ((outputChars / inputChars) * 100).toFixed(1) : "N/A";
log(
`SessionStart: injecting summary — ${messageCount} messages, ${inputChars} → ${outputChars} chars (${ratio}%), took ${durationMs}ms`,
);
} else {
log(`SessionStart: injecting summary (${data.length} chars)`);
}

emitContext(data);
process.stdout.write(data);
await unlink(sf).catch(() => {});
}
6 changes: 3 additions & 3 deletions src/morph.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -21,14 +21,14 @@ function loadApiKey(): string {
try {
const text = readFileSync(ENV_FILE, "utf-8");
for (const line of text.split("\n")) {
const m = line.match(/^MORPH_API_KEY=(.+)$/);
if (m) return m[1].trim();
const key = line.match(/^MORPH_API_KEY=(.+)$/)?.[1];
if (key) return key.trim();
}
} catch {}

throw new Error(
"Morph API key not found. Run /morph-compact:install to configure it, " +
"or set MORPH_API_KEY environment variable.",
"or set MORPH_API_KEY environment variable.",
);
}

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