fix(sim-cli): an unknown option lists the command's own flags

packages/sim-cli/src/embed-isolation.test.ts

@@ -87,4 +87,29 @@ describe('embedded CLI output ownership', () => {
     expect(invalid.stdout).toBe('')
     expect(invalid.stderr).toContain('missing required argument')
   })
+
+  it('answers a guessed flag with the command flags, and an id that opens with a dash with the escape', async () => {
+    const transport = async () => {
+      throw new Error('a parse error must not reach the API')
+    }
+    const [guessed, dashedId, noArguments] = await Promise.all([
+      runEmbeddedCli(['tables', 'rows', 'batch-delete', 'tbl_1', '--row-ids', 'row_1', '--yes'], {
+        ...identity,
+        transport,
+      }),
+      runEmbeddedCli(['audit-logs', 'get', '-X9abc'], { ...identity, transport }),
+      runEmbeddedCli(['logs', 'list', '-X9abc'], { ...identity, transport }),
+    ])
+    expect(guessed.exitCode).toBe(1)
+    expect(guessed.stderr).toContain("unknown option '--row-ids'")
+    expect(guessed.stderr).toContain('Options for sim tables rows batch-delete:')
+    expect(guessed.stderr).toContain('--row <value...>')
+    expect(dashedId.exitCode).toBe(1)
+    expect(dashedId.stderr).toContain('Example: sim audit-logs get -- -X9abc')
+    expect(dashedId.stderr).not.toContain('Options for')
+    // With no positional to escape into, an id-shaped token is just an unknown option.
+    expect(noArguments.exitCode).toBe(1)
+    expect(noArguments.stderr).toContain('Options for sim logs list:')
+    expect(noArguments.stderr).not.toContain('Example:')
+  })
 })

packages/sim-cli/src/runtime/build.ts

@@ -92,13 +92,16 @@ function looksLikeAnId(token: string): boolean {
 }
 
 /**
- * Appends a worked example to the parse errors a positional argument causes.
+ * Appends a worked example to the parse errors a positional argument causes,
+ * and the command's own flags to an unknown option.
  *
  * Covers the argument being absent and the argument being swallowed as an
  * option because its id opens with a dash; the second needs the `--` escape,
- * which commander never mentions.
+ * which commander never mentions. A guessed flag gets the real list: commander
+ * suggests only a near spelling, so `--row-ids` for `--row` got a bare error
+ * and a caller had to look the command up before retrying.
  */
-function addArgumentExamples(command: Command): Command {
+function addParseErrorGuidance(command: Command): Command {
   const outputError = command.configureOutput().outputError
   if (!outputError) throw new Error('Commander output formatter is not configured')
 
@@ -113,10 +116,14 @@ function addArgumentExamples(command: Command): Command {
         return
       }
 
-      if (command.registeredArguments.length === 0) return
       const token = UNKNOWN_OPTION_TOKEN.exec(message)?.[1]
-      if (!token || !looksLikeAnId(token)) return
-      write(`Example: ${commandPath(command)} -- ${token}\n`)
+      if (!token) return
+      if (looksLikeAnId(token) && command.registeredArguments.length > 0) {
+        write(`Example: ${commandPath(command)} -- ${token}\n`)
+        return
+      }
+      const flags = command.options.filter((option) => !option.hidden).map((option) => option.flags)
+      write(`Options for ${commandPath(command)}: ${flags.join(', ')}\n`)
     },
   })
   return command
@@ -339,7 +346,7 @@ function configureOperation(
 }
 
 function buildLeaf(operation: V2OperationName, spec: CommandSpec, leafName: string): Command {
-  return addArgumentExamples(configureOperation(new Command(leafName), operation, spec))
+  return addParseErrorGuidance(configureOperation(new Command(leafName), operation, spec))
 }
 
 /**