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import type { Context } from "@opencode-ai/plugin/effect/plugin"import { ToolFailure } from "@opencode-ai/ai"import { FileDiff } from "@opencode-ai/schema/file-diff"import { Effect, Result, Schema } from "effect"import { Bom } from "@opencode-ai/util/bom"import { Environment } from "../../environment/index.js"import { Formatter } from "../../formatter.js"import { FileMutation } from "../../file-mutation.js"import { Location } from "../../location.js"import { LocationMutation } from "../../location-mutation.js"import { Patch } from "@opencode-ai/util/patch"import { Permission } from "../../permission.js"import DESCRIPTION from "../patch.txt"import { fileDiff } from "./file-diff.js"
export const name = "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 toModelContent = (output: Output) => [ "Success. Updated the following files:", ...output.applied.map( (item) => `${item.type === "add" ? "A" : item.type === "delete" ? "D" : "M"} ${item.resource}`, ), ].join("\n")
type Prepared = | (Extract<Patch.Hunk, { readonly type: "add" }> & { readonly target: LocationMutation.Target readonly content: string readonly before: string readonly after: string }) | (Extract<Patch.Hunk, { readonly type: "delete" }> & { readonly target: LocationMutation.Target readonly before: string readonly after: string }) | (Extract<Patch.Hunk, { readonly type: "update" }> & { readonly target: LocationMutation.Target readonly content: string readonly before: string readonly after: string readonly moveTarget?: LocationMutation.Target })
export const Plugin = { id: "opencode.tool.patch", effect: Effect.fn("PatchTool.Plugin")(function* (ctx: Context) { const environment = yield* Environment.Service const mutation = yield* LocationMutation.Service const fileMutation = yield* FileMutation.Service const formatter = yield* Formatter.Service const location = yield* Location.Service const permission = yield* Permission.Service
yield* ctx.tool .transform((draft) => draft.add({ name, options: { codemode: false, permission: "edit" }, description: DESCRIPTION, input: Input, output: Output, execute: (input, context) => { const applied: Array<typeof Applied.Type> = [] const parsed = Patch.parse(input.patchText) const lockTargets = Result.isSuccess(parsed) ? parsed.success.flatMap((hunk) => [ LocationMutation.resolvePath(location.directory, hunk.path), ...(hunk.type === "update" && hunk.movePath ? [LocationMutation.resolvePath(location.directory, hunk.movePath)] : []), ]) : [] const fail = (operation: string, error: unknown) => { const completed = applied.map((item) => item.resource).join(", ") return new ToolFailure({ message: `${operation}: ${errorMessage(error)}${completed ? `. Completed before failure: ${completed}` : ""}`, }) } return Effect.gen(function* () { const source = { type: "tool" as const, messageID: context.messageID, id: context.id, } if (!input.patchText) return yield* new ToolFailure({ message: "patchText is required" }) const hunks = yield* Effect.fromResult(parsed).pipe( Effect.mapError((error) => new ToolFailure({ message: `patch verification failed: ${error.message}` })), ) if (hunks.length === 0) { return yield* new ToolFailure({ message: "patch rejected: empty patch" }) } const prepared: Prepared[] = [] const updates = new Map<string, string>() const resolveTarget = Effect.fnUntraced(function* (value: string) { const target = yield* mutation.resolve({ path: value, kind: "file" }) if (!target.externalDirectory) return target yield* permission.assert({ ...LocationMutation.externalDirectoryPermission(target.externalDirectory), metadata: { filepath: target.absolute, parentDir: target.externalDirectory.directory, }, sessionID: context.sessionID, agent: context.agent, source, }) return target }) for (const hunk of hunks) { yield* Effect.gen(function* () { const target = yield* resolveTarget(hunk.path) if (hunk.type === "add") { const content = hunk.contents.endsWith("\n") || hunk.contents === "" ? hunk.contents : `${hunk.contents}\n` prepared.push({ ...hunk, target, content, before: "", after: Bom.split(content).text, }) return } if (hunk.type === "delete") { const content = yield* FileMutation.readText(environment.files, target.absolute).pipe( Effect.mapError( (error) => new ToolFailure({ message: `patch verification failed: Failed to delete ${target.resource}: ${errorMessage(error)}`, }), ), ) prepared.push({ ...hunk, target, before: content.text, after: "" }) return } const previous = updates.get(target.absolute) const original = previous ?? (yield* Effect.gen(function* () { const content = yield* FileMutation.readText(environment.files, target.absolute).pipe( Effect.mapError( (error) => new ToolFailure({ message: `patch verification failed: Failed to read file to update ${target.absolute}: ${errorMessage(error)}`, }), ), ) return Bom.join(content.text, content.bom) })) const before = Bom.split(original).text const update = yield* Effect.try({ try: () => Patch.derive(hunk.path, hunk.chunks, original), catch: (error) => new ToolFailure({ message: `patch verification failed: ${errorMessage(error)}` }), }) const moveTarget = hunk.movePath ? yield* resolveTarget(hunk.movePath) : undefined prepared.push({ ...hunk, target, content: Patch.joinBom(update.content, update.bom), before, after: update.content, moveTarget, }) if (!moveTarget) updates.set(target.absolute, Patch.joinBom(update.content, update.bom)) }).pipe( Effect.mapError((error) => error instanceof ToolFailure ? error : new ToolFailure({ message: `Unable to prepare patch at ${hunk.path}`, error }), ), ) }
const patchFiles = prepared.map((change) => patchFile(change)) const targets = prepared.flatMap((change) => [ change.target, ...(change.type === "update" && change.moveTarget ? [change.moveTarget] : []), ]) yield* permission.assert({ action: "edit", resources: [...new Set(targets.map((target) => target.resource))], save: ["*"], metadata: { filepath: targets.map((target) => target.resource).join(", "), diff: patchFiles.map((file) => `${file.patch}\n`).join(""), files: patchFiles, }, sessionID: context.sessionID, agent: context.agent, source, })
yield* Effect.forEach( prepared, (change) => Effect.gen(function* () { if (change.type === "delete") { yield* environment.files .remove(change.target.absolute) .pipe(Effect.mapError((error) => fail(`Failed to delete ${change.target.resource}`, error))) applied.push({ type: change.type, resource: change.target.resource, target: change.target.absolute, }) return } if (change.type === "update" && change.moveTarget) { const moveTarget = change.moveTarget yield* environment.files .write(moveTarget.absolute, new TextEncoder().encode(change.content)) .pipe(Effect.mapError((error) => fail(`Failed to write ${moveTarget.resource}`, error))) yield* environment.files .remove(change.target.absolute) .pipe( Effect.mapError((error) => fail(`Wrote ${moveTarget.resource} but failed to remove ${change.target.resource}`, error), ), ) applied.push({ type: change.type, resource: change.moveTarget.resource, target: change.moveTarget.absolute, }) return } yield* environment.files .write(change.target.absolute, new TextEncoder().encode(change.content)) .pipe(Effect.mapError((error) => fail(`Failed to write ${change.target.resource}`, error))) applied.push({ type: change.type, resource: change.target.resource, target: change.target.absolute, }) }), { discard: true }, ) const formatted = new Map<string, string>() yield* Effect.forEach( [...new Set(applied.filter((item) => item.type !== "delete").map((item) => item.target))], (target) => Effect.gen(function* () { const current = yield* FileMutation.readText(environment.files, target).pipe( Effect.mapError((error) => fail(`Failed to read ${target}`, error)), ) formatted.set( target, (yield* formatter.file(target)) ? yield* FileMutation.syncTextBom(environment.files, target, current.bom).pipe( Effect.mapError((error) => fail(`Failed to sync ${target}`, error)), ) : current.text, ) }), { discard: true }, ) const files = prepared.map((change) => { if (change.type === "delete") return patchFile(change) const target = change.type === "update" && change.moveTarget ? change.moveTarget : change.target return patchFile(change, formatted.get(target.absolute)) }) return { applied, files } }).pipe( fileMutation.withLock(lockTargets), Effect.map((output) => ({ output, content: toModelContent(output), metadata: { files: output.files }, })), Effect.mapError((error) => error instanceof ToolFailure ? error : new ToolFailure({ message: "Unable to apply patch", error }), ), ) }, }), ) .pipe(Effect.orDie)
yield* ctx.session.hook("context", (event) => Effect.sync(() => { const usePatch = event.model.id.includes("gpt-") && !event.model.id.includes("oss") && !event.model.id.includes("gpt-4") if (usePatch) { delete event.tools.edit delete event.tools.write return } delete event.tools.patch }), ) }),}
function errorMessage(error: unknown) { if (error instanceof Environment.NotFound) return "file does not exist" if (error instanceof Environment.WrongKind) return error.actual === "directory" ? "path is a directory" : `path is ${error.actual}` if (error instanceof Environment.Failed) return errorMessage(error.cause) return error instanceof Error ? error.message : String(error)}
function patchFile(change: Prepared, after = change.after): typeof FileDiff.Info.Type { const target = (change.type === "update" ? change.moveTarget : undefined)?.resource ?? change.target.resource const diff = fileDiff( change.target.absolute, change.before, after, change.type === "add" ? "added" : change.type === "delete" ? "deleted" : "modified", ) return { ...diff, file: target, patch: trimDiff(diff.patch), }}
function trimDiff(diff: string) { const lines = diff.split("\n") const content = lines.filter( (line) => (line.startsWith("+") || line.startsWith("-") || line.startsWith(" ")) && !line.startsWith("---") && !line.startsWith("+++"), ) if (content.length === 0) return diff const indent = content.reduce((result, line) => { const value = line.slice(1) if (value.trim().length === 0) return result return Math.min(result, value.match(/^(\s*)/)?.[1].length ?? result) }, Infinity) if (indent === Infinity || indent === 0) return diff return lines .map((line) => { if ( (line.startsWith("+") || line.startsWith("-") || line.startsWith(" ")) && !line.startsWith("---") && !line.startsWith("+++") ) { return line[0] + line.slice(1 + indent) } return line }) .join("\n")}