File size: 9,581 Bytes
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import { ToolFailure } from "@opencode-ai/llm"
import { FileDiff } from "@opencode-ai/schema/file-diff"
import { createTwoFilesPatch, diffLines } from "diff"
import { Effect, Layer, Schema } from "effect"
import { makeLocationNode } from "../effect/app-node"
import { FileMutation } from "../file-mutation"
import { FSUtil } from "../fs-util"
import { LocationMutation } from "../location-mutation"
import { Patch } from "../patch"
import { PermissionV2 } from "../permission"
import { ToolRegistry } from "./registry"
import { Tool } from "./tool"
import { Tools } from "./tools"
export const name = "apply_patch"
export const Input = Schema.Struct({
patchText: Schema.String.annotate({
description: "The full patch text describing add, update, and delete operations",
}),
})
export const Applied = Schema.Struct({
type: Schema.Literals(["add", "update", "delete"]),
resource: Schema.String,
target: Schema.String,
})
export const Output = Schema.Struct({
applied: Schema.Array(Applied),
files: Schema.Array(FileDiff.Info),
})
export type Output = typeof Output.Type
export const toModelOutput = (output: Output) =>
[
"Applied patch sequentially:",
...output.applied.map(
(item) => `${item.type === "add" ? "A" : item.type === "delete" ? "D" : "M"} ${item.resource}`,
),
].join("\n")
type Prepared =
| (Extract<Patch.Hunk, { readonly type: "add" | "delete" }> & {
readonly target: LocationMutation.Target
readonly before: string
readonly after: string
})
| (Extract<Patch.Hunk, { readonly type: "update" }> & {
readonly target: LocationMutation.Target
readonly source: Uint8Array
readonly content: string
readonly before: string
readonly after: string
})
const layer = Layer.effectDiscard(
Effect.gen(function* () {
const tools = yield* Tools.Service
const mutation = yield* LocationMutation.Service
const files = yield* FileMutation.Service
const fs = yield* FSUtil.Service
const permission = yield* PermissionV2.Service
yield* tools
.register({
[name]: Tool.withPermission(
Tool.make({
description:
"Apply one patch containing add, update, and delete file operations. All targets are resolved and approved before target contents are read. Operations apply sequentially; if a later operation fails, earlier operations remain applied and the failure reports them explicitly. Moves and atomic rollback are not supported yet.",
input: Input,
output: Output,
toModelOutput: ({ output }) => [{ type: "text", text: toModelOutput(output) }],
execute: (input, context) => {
const applied: Array<typeof Applied.Type> = []
const fail = (path: string) => {
const prefix =
applied.length === 0
? `Unable to apply patch at ${path}`
: `Patch partially applied before failing at ${path}. Applied: ${applied.map((item) => item.resource).join(", ")}`
return new ToolFailure({ message: prefix })
}
return Effect.gen(function* () {
const source = {
type: "tool" as const,
messageID: context.assistantMessageID,
callID: context.toolCallID,
}
if (!input.patchText.trim()) return yield* new ToolFailure({ message: "patchText is required" })
const hunks = yield* Effect.try({
try: () => Patch.parse(input.patchText),
catch: (cause) => new ToolFailure({ message: `apply_patch verification failed: ${String(cause)}` }),
})
if (hunks.length === 0) return yield* new ToolFailure({ message: "patch rejected: empty patch" })
const move = hunks.find((hunk) => hunk.type === "update" && hunk.movePath !== undefined)
if (move) return yield* new ToolFailure({ message: "apply_patch moves are not supported yet" })
const targets: Array<{ readonly hunk: Patch.Hunk; readonly target: LocationMutation.Target }> = []
for (const hunk of hunks)
targets.push({ hunk, target: yield* mutation.resolve({ path: hunk.path, kind: "file" }) })
const externalDirectories = new Map<string, LocationMutation.ExternalDirectoryAuthorization>()
for (const { target } of targets) {
const external = target.externalDirectory
if (external) externalDirectories.set(external.resource, external)
}
for (const external of externalDirectories.values()) {
yield* permission.assert({
...LocationMutation.externalDirectoryPermission(external),
sessionID: context.sessionID,
agent: context.agent,
source,
})
}
yield* permission.assert({
action: "edit",
resources: [...new Set(targets.map(({ target }) => target.resource))],
save: ["*"],
sessionID: context.sessionID,
agent: context.agent,
source,
})
const prepared: Prepared[] = []
for (const { hunk, target } of targets) {
yield* Effect.gen(function* () {
if (hunk.type === "add") {
prepared.push({
...hunk,
target,
before: "",
after:
hunk.contents.endsWith("\n") || hunk.contents === "" ? hunk.contents : `${hunk.contents}\n`,
})
return
}
if ((yield* fs.stat(target.canonical)).type !== "File") yield* fail(hunk.path)
const source = yield* fs.readFile(target.canonical)
const original = new TextDecoder("utf-8", { ignoreBOM: true }).decode(source)
const before = original.replace(/^\uFEFF/, "")
if (hunk.type === "delete") {
prepared.push({ ...hunk, target, before, after: "" })
return
}
const update = Patch.derive(hunk.path, hunk.chunks, original)
prepared.push({
...hunk,
target,
source,
content: Patch.joinBom(update.content, update.bom),
before,
after: update.content,
})
}).pipe(Effect.mapError(() => fail(hunk.path)))
}
const patchFiles = prepared.map(patchFile)
yield* Effect.forEach(
prepared,
(change) =>
Effect.gen(function* () {
if (change.type === "add") {
const result = yield* files.create({
target: change.target,
content:
change.contents.endsWith("\n") || change.contents === ""
? change.contents
: `${change.contents}\n`,
})
applied.push({ type: change.type, resource: result.resource, target: result.target })
return
}
if (change.type === "delete") {
const result = yield* files.remove({ target: change.target })
applied.push({ type: change.type, resource: result.resource, target: result.target })
return
}
const result = yield* files.writeIfUnchanged({
target: change.target,
expected: change.source,
content: change.content,
})
applied.push({ type: change.type, resource: result.resource, target: result.target })
}).pipe(Effect.mapError(() => fail(change.path))),
{ discard: true },
)
return { applied, files: patchFiles }
}).pipe(Effect.mapError((error) => (error instanceof ToolFailure ? error : fail("patch"))))
},
}),
"edit",
),
})
.pipe(Effect.orDie)
}),
)
export const node = makeLocationNode({
name: "tool/apply-patch",
layer,
deps: [ToolRegistry.node, LocationMutation.node, FileMutation.node, FSUtil.node, PermissionV2.node],
})
function patchFile(change: Prepared): typeof FileDiff.Info.Type {
const counts = diffLines(change.before, change.after).reduce(
(result, item) => ({
additions: result.additions + (item.added ? (item.count ?? 0) : 0),
deletions: result.deletions + (item.removed ? (item.count ?? 0) : 0),
}),
{ additions: 0, deletions: 0 },
)
return {
file: change.target.resource,
patch: createTwoFilesPatch(change.target.resource, change.target.resource, change.before, change.after),
status: change.type === "add" ? "added" : change.type === "delete" ? "deleted" : "modified",
...counts,
}
}
|