feat: add first-class pi target with mcporter/subagent compatibility

src/converters/claude-to-pi.ts

@@ -0,0 +1,205 @@
+import { formatFrontmatter } from "../utils/frontmatter"
+import type { ClaudeAgent, ClaudeCommand, ClaudeMcpServer, ClaudePlugin } from "../types/claude"
+import type {
+  PiBundle,
+  PiGeneratedSkill,
+  PiMcporterConfig,
+  PiMcporterServer,
+} from "../types/pi"
+import type { ClaudeToOpenCodeOptions } from "./claude-to-opencode"
+import { PI_COMPAT_EXTENSION_SOURCE } from "../templates/pi/compat-extension"
+
+export type ClaudeToPiOptions = ClaudeToOpenCodeOptions
+
+const PI_DESCRIPTION_MAX_LENGTH = 1024
+
+export function convertClaudeToPi(
+  plugin: ClaudePlugin,
+  _options: ClaudeToPiOptions,
+): PiBundle {
+  const promptNames = new Set<string>()
+  const usedSkillNames = new Set<string>(plugin.skills.map((skill) => normalizeName(skill.name)))
+
+  const prompts = plugin.commands
+    .filter((command) => !command.disableModelInvocation)
+    .map((command) => convertPrompt(command, promptNames))
+
+  const generatedSkills = plugin.agents.map((agent) => convertAgent(agent, usedSkillNames))
+
+  const extensions = [
+    {
+      name: "compound-engineering-compat.ts",
+      content: PI_COMPAT_EXTENSION_SOURCE,
+    },
+  ]
+
+  return {
+    prompts,
+    skillDirs: plugin.skills.map((skill) => ({
+      name: skill.name,
+      sourceDir: skill.sourceDir,
+    })),
+    generatedSkills,
+    extensions,
+    mcporterConfig: plugin.mcpServers ? convertMcpToMcporter(plugin.mcpServers) : undefined,
+  }
+}
+
+function convertPrompt(command: ClaudeCommand, usedNames: Set<string>) {
+  const name = uniqueName(normalizeName(command.name), usedNames)
+  const frontmatter: Record<string, unknown> = {
+    description: command.description,
+    "argument-hint": command.argumentHint,
+  }
+
+  let body = transformContentForPi(command.body)
+  body = appendCompatibilityNoteIfNeeded(body)
+
+  return {
+    name,
+    content: formatFrontmatter(frontmatter, body.trim()),
+  }
+}
+
+function convertAgent(agent: ClaudeAgent, usedNames: Set<string>): PiGeneratedSkill {
+  const name = uniqueName(normalizeName(agent.name), usedNames)
+  const description = sanitizeDescription(
+    agent.description ?? `Converted from Claude agent ${agent.name}`,
+  )
+
+  const frontmatter: Record<string, unknown> = {
+    name,
+    description,
+  }
+
+  const sections: string[] = []
+  if (agent.capabilities && agent.capabilities.length > 0) {
+    sections.push(`## Capabilities\n${agent.capabilities.map((capability) => `- ${capability}`).join("\n")}`)
+  }
+
+  const body = [
+    ...sections,
+    agent.body.trim().length > 0
+      ? agent.body.trim()
+      : `Instructions converted from the ${agent.name} agent.`,
+  ].join("\n\n")
+
+  return {
+    name,
+    content: formatFrontmatter(frontmatter, body),
+  }
+}
+
+function transformContentForPi(body: string): string {
+  let result = body
+
+  // Task repo-research-analyst(feature_description)
+  // -> Run subagent with agent="repo-research-analyst" and task="feature_description"
+  const taskPattern = /^(\s*-?\s*)Task\s+([a-z][a-z0-9-]*)\(([^)]+)\)/gm
+  result = result.replace(taskPattern, (_match, prefix: string, agentName: string, args: string) => {
+    const skillName = normalizeName(agentName)
+    const trimmedArgs = args.trim().replace(/\s+/g, " ")
+    return `${prefix}Run subagent with agent=\"${skillName}\" and task=\"${trimmedArgs}\".`
+  })
+
+  // Claude-specific tool references
+  result = result.replace(/\bAskUserQuestion\b/g, "ask_user_question")
+  result = result.replace(/\bTodoWrite\b/g, "file-based todos (todos/ + /skill:file-todos)")
+  result = result.replace(/\bTodoRead\b/g, "file-based todos (todos/ + /skill:file-todos)")
+
+  // /command-name or /workflows:command-name -> /workflows-command-name
+  const slashCommandPattern = /(?<![:\w])\/([a-z][a-z0-9_:-]*?)(?=[\s,."')\]}`]|$)/gi
+  result = result.replace(slashCommandPattern, (match, commandName: string) => {
+    if (commandName.includes("/")) return match
+    if (["dev", "tmp", "etc", "usr", "var", "bin", "home"].includes(commandName)) {
+      return match
+    }
+
+    if (commandName.startsWith("skill:")) {
+      const skillName = commandName.slice("skill:".length)
+      return `/skill:${normalizeName(skillName)}`
+    }
+
+    const withoutPrefix = commandName.startsWith("prompts:")
+      ? commandName.slice("prompts:".length)
+      : commandName
+
+    return `/${normalizeName(withoutPrefix)}`
+  })
+
+  return result
+}
+
+function appendCompatibilityNoteIfNeeded(body: string): string {
+  if (!/\bmcp\b/i.test(body)) return body
+
+  const note = [
+    "",
+    "## Pi + MCPorter note",
+    "For MCP access in Pi, use MCPorter via the generated tools:",
+    "- `mcporter_list` to inspect available MCP tools",
+    "- `mcporter_call` to invoke a tool",
+    "",
+  ].join("\n")
+
+  return body + note
+}
+
+function convertMcpToMcporter(servers: Record<string, ClaudeMcpServer>): PiMcporterConfig {
+  const mcpServers: Record<string, PiMcporterServer> = {}
+
+  for (const [name, server] of Object.entries(servers)) {
+    if (server.command) {
+      mcpServers[name] = {
+        command: server.command,
+        args: server.args,
+        env: server.env,
+        headers: server.headers,
+      }
+      continue
+    }
+
+    if (server.url) {
+      mcpServers[name] = {
+        baseUrl: server.url,
+        headers: server.headers,
+      }
+    }
+  }
+
+  return { mcpServers }
+}
+
+function normalizeName(value: string): string {
+  const trimmed = value.trim()
+  if (!trimmed) return "item"
+  const normalized = trimmed
+    .toLowerCase()
+    .replace(/[\\/]+/g, "-")
+    .replace(/[:\s]+/g, "-")
+    .replace(/[^a-z0-9_-]+/g, "-")
+    .replace(/-+/g, "-")
+    .replace(/^-+|-+$/g, "")
+  return normalized || "item"
+}
+
+function sanitizeDescription(value: string, maxLength = PI_DESCRIPTION_MAX_LENGTH): string {
+  const normalized = value.replace(/\s+/g, " ").trim()
+  if (normalized.length <= maxLength) return normalized
+  const ellipsis = "..."
+  return normalized.slice(0, Math.max(0, maxLength - ellipsis.length)).trimEnd() + ellipsis
+}
+
+function uniqueName(base: string, used: Set<string>): string {
+  if (!used.has(base)) {
+    used.add(base)
+    return base
+  }
+  let index = 2
+  while (used.has(`${base}-${index}`)) {
+    index += 1
+  }
+  const name = `${base}-${index}`
+  used.add(name)
+  return name
+}