opencode/packages/core/src/plugin/command.ts

export * as CommandPlugin from "./command.js"

import { define } from "@opencode-ai/plugin/effect/plugin"
import { McpEvent } from "@opencode-ai/schema/mcp-event"
import { Effect, Stream } from "effect"
import { Bus } from "../bus.js"
import { Location } from "../location.js"
import { MCP } from "../mcp/index.js"
import PROMPT_INITIALIZE from "./command/initialize.txt"
import PROMPT_REVIEW from "./command/review.txt"

export const Plugin = define({
  id: "opencode.command",
  effect: Effect.fn(function* (ctx) {
    const location = yield* Location.Service
    const mcp = yield* MCP.Service
    const bus = yield* Bus.Service
    const loaded = { prompts: [] as MCP.Prompt[] }
    yield* bus
      .subscribe(McpEvent.PromptsChanged)
      .pipe(
        Stream.runForEach(() =>
          mcp.prompts().pipe(
            Effect.tap((prompts) => Effect.sync(() => (loaded.prompts = prompts))),
            Effect.andThen(ctx.command.reload()),
          ),
        ),
        Effect.forkScoped({ startImmediately: true }),
      )
    loaded.prompts = yield* mcp.prompts()
    yield* ctx.command.transform((draft) => {
      draft.add({
        name: "init",
        description: "guided AGENTS.md setup",
        execute: (input) =>
          ctx.session
            .prompt({
              ...input.prompt,
              sessionID: input.sessionID,
              text: append(PROMPT_INITIALIZE.replace("${path}", location.project.directory), input.prompt.text),
              delivery: input.delivery,
            })
            .pipe(Effect.asVoid),
      })
      draft.add({
        name: "review",
        description: "review changes [commit|branch|pr], defaults to uncommitted",
        execute: (input) =>
          ctx.session
            .prompt({
              ...input.prompt,
              sessionID: input.sessionID,
              text: append(PROMPT_REVIEW.replace("${path}", location.project.directory), input.prompt.text),
              delivery: input.delivery,
            })
            .pipe(Effect.asVoid),
      })
      for (const prompt of loaded.prompts) {
        draft.add({
          name: mcpCommandName(prompt.server, prompt.name),
          description: prompt.description,
          execute: (input) =>
            Effect.gen(function* () {
              const result = yield* mcp.prompt({
                server: prompt.server,
                name: prompt.name,
                args: Object.fromEntries(
                  (prompt.arguments ?? []).map((argument, index) => [
                    argument.name,
                    parseArguments(input.prompt.text)[index] ?? "",
                  ]),
                ),
              })
              if (!result) return yield* Effect.fail(new Error(`MCP prompt not found: ${prompt.server}:${prompt.name}`))
              yield* ctx.session.prompt({
                ...input.prompt,
                sessionID: input.sessionID,
                text: result.messages
                  .map((message) => promptMessageText(message.content))
                  .join("\n")
                  .trim(),
                delivery: input.delivery,
              })
            }).pipe(Effect.asVoid),
        })
      }
    })
  }),
})

function append(template: string, input: string) {
  return [template, input.trim()].filter(Boolean).join("\n\n")
}

function parseArguments(input: string) {
  return (input.match(argsRegex) ?? []).map((argument) => argument.replace(quoteTrimRegex, ""))
}

function promptMessageText(content: unknown) {
  if (typeof content === "string") return content
  if (!content || typeof content !== "object") return ""
  if (!("type" in content) || content.type !== "text") return ""
  if (!("text" in content) || typeof content.text !== "string") return ""
  return content.text
}

function mcpCommandName(server: string, prompt: string) {
  return `${sanitize(server)}:${sanitize(prompt)}`
}

function sanitize(value: string) {
  return value.replace(/[^a-zA-Z0-9_-]/g, "_")
}

const argsRegex = /(?:\[Image\s+\d+\]|"[^"]*"|'[^']*'|[^\s"']+)/gi
const quoteTrimRegex = /^["']|["']$/g