fix: add tests and fix typing for formatter trigger (#2768)

src/plugin-handlers/config-handler.ts

@@ -7,6 +7,7 @@ import { applyMcpConfig } from "./mcp-config-handler";
 import { applyProviderConfig } from "./provider-config-handler";
 import { loadPluginComponents } from "./plugin-components-loader";
 import { applyToolConfig } from "./tool-config-handler";
+import { clearFormatterCache } from "../tools/hashline-edit/formatter-trigger"
 
 export { resolveCategoryConfig } from "./category-config-resolver";
 
@@ -23,6 +24,7 @@ export function createConfigHandler(deps: ConfigHandlerDeps) {
     const formatterConfig = config.formatter;
 
     applyProviderConfig({ config, modelCacheState });
+    clearFormatterCache()
 
     const pluginComponents = await loadPluginComponents({ pluginConfig });
 

src/tools/hashline-edit/formatter-trigger.test.ts

@@ -0,0 +1,376 @@
+import { describe, it, expect, beforeEach, mock } from "bun:test"
+import {
+  runFormattersForFile,
+  clearFormatterCache,
+  resolveFormatters,
+  buildFormatterCommand,
+  type FormatterClient,
+} from "./formatter-trigger"
+
+function createMockClient(config: Record<string, unknown> = {}): FormatterClient {
+  return {
+    config: {
+      get: mock(() => Promise.resolve({ data: config })),
+    },
+  }
+}
+
+describe("buildFormatterCommand", () => {
+  it("substitutes $FILE with the actual file path", () => {
+    //#given
+    const command = ["prettier", "--write", "$FILE"]
+    const filePath = "/src/index.ts"
+
+    //#when
+    const result = buildFormatterCommand(command, filePath)
+
+    //#then
+    expect(result).toEqual(["prettier", "--write", "/src/index.ts"])
+  })
+
+  it("substitutes multiple $FILE occurrences in the same arg", () => {
+    //#given
+    const command = ["echo", "$FILE:$FILE"]
+    const filePath = "test.ts"
+
+    //#when
+    const result = buildFormatterCommand(command, filePath)
+
+    //#then
+    expect(result).toEqual(["echo", "test.ts:test.ts"])
+  })
+
+  it("returns command unchanged when no $FILE present", () => {
+    //#given
+    const command = ["prettier", "--check", "."]
+
+    //#when
+    const result = buildFormatterCommand(command, "/some/file.ts")
+
+    //#then
+    expect(result).toEqual(["prettier", "--check", "."])
+  })
+})
+
+describe("resolveFormatters", () => {
+  beforeEach(() => {
+    clearFormatterCache()
+  })
+
+  it("resolves formatters from config.formatter section", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: {
+        prettier: {
+          command: ["prettier", "--write", "$FILE"],
+          extensions: [".ts", ".tsx"],
+        },
+      },
+    })
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(result.get(".ts")).toEqual([{ command: ["prettier", "--write", "$FILE"], environment: {} }])
+    expect(result.get(".tsx")).toEqual([{ command: ["prettier", "--write", "$FILE"], environment: {} }])
+  })
+
+  it("resolves formatters from experimental.hook.file_edited section", async () => {
+    //#given
+    const client = createMockClient({
+      experimental: {
+        hook: {
+          file_edited: {
+            ".go": [{ command: ["gofmt", "-w", "$FILE"], environment: { GOPATH: "/go" } }],
+          },
+        },
+      },
+    })
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(result.get(".go")).toEqual([{ command: ["gofmt", "-w", "$FILE"], environment: { GOPATH: "/go" } }])
+  })
+
+  it("normalizes extensions without leading dot", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: {
+        biome: {
+          command: ["biome", "format", "$FILE"],
+          extensions: ["ts", "js"],
+        },
+      },
+    })
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(result.has(".ts")).toBe(true)
+    expect(result.has(".js")).toBe(true)
+  })
+
+  it("skips disabled formatters", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: {
+        prettier: {
+          disabled: true,
+          command: ["prettier", "--write", "$FILE"],
+          extensions: [".ts"],
+        },
+      },
+    })
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(result.size).toBe(0)
+  })
+
+  it("skips formatters without command", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: {
+        prettier: {
+          extensions: [".ts"],
+        },
+      },
+    })
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(result.size).toBe(0)
+  })
+
+  it("skips formatters without extensions", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: {
+        prettier: {
+          command: ["prettier", "--write", "$FILE"],
+        },
+      },
+    })
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(result.size).toBe(0)
+  })
+
+  it("returns cached result on subsequent calls", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: {
+        prettier: {
+          command: ["prettier", "--write", "$FILE"],
+          extensions: [".ts"],
+        },
+      },
+    })
+    await resolveFormatters(client, "/project")
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(client.config.get).toHaveBeenCalledTimes(1)
+    expect(result.get(".ts")).toHaveLength(1)
+  })
+
+  it("returns fresh result after clearFormatterCache", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: {
+        prettier: {
+          command: ["prettier", "--write", "$FILE"],
+          extensions: [".ts"],
+        },
+      },
+    })
+    await resolveFormatters(client, "/project")
+    clearFormatterCache()
+
+    //#when
+    await resolveFormatters(client, "/project")
+
+    //#then
+    expect(client.config.get).toHaveBeenCalledTimes(2)
+  })
+
+  it("handles config.get failure gracefully", async () => {
+    //#given
+    const client: FormatterClient = {
+      config: {
+        get: mock(() => Promise.reject(new Error("network error"))),
+      },
+    }
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(result.size).toBe(0)
+  })
+
+  it("handles missing config data", async () => {
+    //#given
+    const client: FormatterClient = {
+      config: {
+        get: mock(() => Promise.resolve({ data: undefined })),
+      },
+    }
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(result.size).toBe(0)
+  })
+
+  it("merges formatter and experimental.hook.file_edited for same extension", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: {
+        prettier: {
+          command: ["prettier", "--write", "$FILE"],
+          extensions: [".ts"],
+        },
+      },
+      experimental: {
+        hook: {
+          file_edited: {
+            ".ts": [{ command: ["eslint", "--fix", "$FILE"] }],
+          },
+        },
+      },
+    })
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(result.get(".ts")).toHaveLength(2)
+    expect(result.get(".ts")![0].command).toEqual(["prettier", "--write", "$FILE"])
+    expect(result.get(".ts")![1].command).toEqual(["eslint", "--fix", "$FILE"])
+  })
+
+  it("defaults environment to empty object when not specified", async () => {
+    //#given
+    const client = createMockClient({
+      experimental: {
+        hook: {
+          file_edited: {
+            ".py": [{ command: ["black", "$FILE"] }],
+          },
+        },
+      },
+    })
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(result.get(".py")![0].environment).toEqual({})
+  })
+
+  it("preserves environment from formatter config", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: {
+        biome: {
+          command: ["biome", "format", "$FILE"],
+          extensions: [".ts"],
+          environment: { BIOME_LOG: "debug" },
+        },
+      },
+    })
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(result.get(".ts")![0].environment).toEqual({ BIOME_LOG: "debug" })
+  })
+
+  it("skips formatter=false config", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: false,
+    })
+
+    //#when
+    const result = await resolveFormatters(client, "/project")
+
+    //#then
+    expect(result.size).toBe(0)
+  })
+})
+
+describe("runFormattersForFile", () => {
+  beforeEach(() => {
+    clearFormatterCache()
+  })
+
+  it("skips files without extensions", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: {
+        prettier: {
+          command: ["prettier", "--write", "$FILE"],
+          extensions: [".ts"],
+        },
+      },
+    })
+
+    //#when
+    await runFormattersForFile(client, "/project", "Makefile")
+
+    //#then
+    expect(client.config.get).not.toHaveBeenCalled()
+  })
+
+  it("skips when no matching formatters for extension", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: {
+        prettier: {
+          command: ["prettier", "--write", "$FILE"],
+          extensions: [".ts"],
+        },
+      },
+    })
+
+    //#when — run for a .go file, but only .ts formatters registered
+    await runFormattersForFile(client, "/project", "/src/main.go")
+
+    //#then — no error thrown
+  })
+
+  it("runs formatter for matching extension", async () => {
+    //#given
+    const client = createMockClient({
+      formatter: {
+        echo: {
+          command: ["echo", "$FILE"],
+          extensions: [".ts"],
+        },
+      },
+    })
+
+    //#when — echo is a safe no-op command
+    await runFormattersForFile(client, "/tmp", "/tmp/test.ts")
+
+    //#then — should complete without error
+    expect(client.config.get).toHaveBeenCalledTimes(1)
+  })
+})

src/tools/hashline-edit/formatter-trigger.ts

@@ -19,7 +19,7 @@ interface OpencodeConfig {
   }
 }
 
-interface OpencodeClient {
+export interface FormatterClient {
   config: {
     get: (options?: { query?: { directory?: string } }) => Promise<{ data?: OpencodeConfig }>
   }
@@ -27,8 +27,8 @@ interface OpencodeClient {
 
 let cachedFormatters: Map<string, Array<{ command: string[]; environment: Record<string, string> }>> | null = null
 
-async function resolveFormatters(
+export async function resolveFormatters(
-  client: OpencodeClient,
+  client: FormatterClient,
   directory: string,
 ): Promise<Map<string, Array<{ command: string[]; environment: Record<string, string> }>>> {
   if (cachedFormatters) return cachedFormatters
@@ -76,12 +76,12 @@ async function resolveFormatters(
   return result
 }
 
-function buildFormatterCommand(command: string[], filePath: string): string[] {
+export function buildFormatterCommand(command: string[], filePath: string): string[] {
   return command.map((arg) => arg.replace(/\$FILE/g, filePath))
 }
 
 export async function runFormattersForFile(
-  client: OpencodeClient,
+  client: FormatterClient,
   directory: string,
   filePath: string,
 ): Promise<void> {

src/tools/hashline-edit/hashline-edit-executor.ts

@@ -6,7 +6,7 @@ import { canonicalizeFileText, restoreFileText } from "./file-text-canonicalizat
 import { normalizeHashlineEdits, type RawHashlineEdit } from "./normalize-edits"
 import type { HashlineEdit } from "./types"
 import { HashlineMismatchError } from "./validation"
-import { runFormattersForFile } from "./formatter-trigger"
+import { runFormattersForFile, type FormatterClient } from "./formatter-trigger"
 import type { PluginContext } from "../../plugin/types"
 
 interface HashlineEditArgs {
@@ -132,7 +132,7 @@ export async function executeHashlineEditTool(args: HashlineEditArgs, context: T
     await Bun.write(filePath, writeContent)
 
     if (pluginCtx?.client) {
-      await runFormattersForFile(pluginCtx.client as any, context.directory, filePath)
+      await runFormattersForFile(pluginCtx.client as FormatterClient, context.directory, filePath)
       const formattedContent = Buffer.from(await Bun.file(filePath).arrayBuffer()).toString("utf8")
       if (formattedContent !== writeContent) {
         const formattedEnvelope = canonicalizeFileText(formattedContent)