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summary.ts
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import { fn } from "@/util/fn"
import z from "zod"
import { Session } from "."
import { MessageV2 } from "./message-v2"
import { Identifier } from "@/id/id"
import { Snapshot } from "@/snapshot"
import { Storage } from "@/storage/storage"
import { Bus } from "@/bus"
export namespace SessionSummary {
function unquoteGitPath(input: string) {
if (!input.startsWith('"')) return input
if (!input.endsWith('"')) return input
const body = input.slice(1, -1)
const bytes: number[] = []
for (let i = 0; i < body.length; i++) {
const char = body[i]!
if (char !== "\\") {
bytes.push(char.charCodeAt(0))
continue
}
const next = body[i + 1]
if (!next) {
bytes.push("\\".charCodeAt(0))
continue
}
if (next >= "0" && next <= "7") {
const chunk = body.slice(i + 1, i + 4)
const match = chunk.match(/^[0-7]{1,3}/)
if (!match) {
bytes.push(next.charCodeAt(0))
i++
continue
}
bytes.push(parseInt(match[0], 8))
i += match[0].length
continue
}
const escaped =
next === "n"
? "\n"
: next === "r"
? "\r"
: next === "t"
? "\t"
: next === "b"
? "\b"
: next === "f"
? "\f"
: next === "v"
? "\v"
: next === "\\" || next === '"'
? next
: undefined
bytes.push((escaped ?? next).charCodeAt(0))
i++
}
return Buffer.from(bytes).toString()
}
export const summarize = fn(
z.object({
sessionID: z.string(),
messageID: z.string(),
}),
async (input) => {
const all = await Session.messages({ sessionID: input.sessionID })
await Promise.all([
summarizeSession({ sessionID: input.sessionID, messages: all }),
summarizeMessage({ messageID: input.messageID, messages: all }),
])
},
)
async function summarizeSession(input: { sessionID: string; messages: MessageV2.WithParts[] }) {
const diffs = await computeDiff({ messages: input.messages })
await Session.setSummary({
sessionID: input.sessionID,
summary: {
additions: diffs.reduce((sum, x) => sum + x.additions, 0),
deletions: diffs.reduce((sum, x) => sum + x.deletions, 0),
files: diffs.length,
},
})
await Storage.write(["session_diff", input.sessionID], diffs)
Bus.publish(Session.Event.Diff, {
sessionID: input.sessionID,
diff: diffs,
})
}
async function summarizeMessage(input: { messageID: string; messages: MessageV2.WithParts[] }) {
const messages = input.messages.filter(
(m) => m.info.id === input.messageID || (m.info.role === "assistant" && m.info.parentID === input.messageID),
)
const msgWithParts = messages.find((m) => m.info.id === input.messageID)!
const userMsg = msgWithParts.info as MessageV2.User
const diffs = await computeDiff({ messages })
userMsg.summary = {
...userMsg.summary,
diffs,
}
await Session.updateMessage(userMsg)
}
export const diff = fn(
z.object({
sessionID: Identifier.schema("session"),
messageID: Identifier.schema("message").optional(),
}),
async (input) => {
const diffs = await Storage.read<Snapshot.FileDiff[]>(["session_diff", input.sessionID]).catch(() => [])
const next = diffs.map((item) => {
const file = unquoteGitPath(item.file)
if (file === item.file) return item
return {
...item,
file,
}
})
const changed = next.some((item, i) => item.file !== diffs[i]?.file)
if (changed) Storage.write(["session_diff", input.sessionID], next).catch(() => {})
return next
},
)
export async function computeDiff(input: { messages: MessageV2.WithParts[] }) {
let from: string | undefined
let to: string | undefined
// scan assistant messages to find earliest from and latest to
// snapshot
for (const item of input.messages) {
if (!from) {
for (const part of item.parts) {
if (part.type === "step-start" && part.snapshot) {
from = part.snapshot
break
}
}
}
for (const part of item.parts) {
if (part.type === "step-finish" && part.snapshot) {
to = part.snapshot
}
}
}
if (from && to) return Snapshot.diffFull(from, to)
return []
}
}