[feat Request] flutter_app_packager调用inno setup时使用了硬编码的地址，能否支持更灵活的

[deuteros-gex]

新年快乐！

这个地方硬编码了地址
https://github.com/fastforgedev/fastforge/blob/main/packages/flutter_app_packager/lib/src/makers/exe/inno_setup/inno_setup_compiler.dart

class InnoSetupCompiler {
  Future<bool> compile(InnoSetupScript script) async {
    Directory innoSetupDirectory =
        Directory('C:\\Program Files (x86)\\Inno Setup 6');

    if (!innoSetupDirectory.existsSync()) {
      throw Exception('`Inno Setup 6` was not installed.');
    }

inno setup也可以通过scoop安装的
https://github.com/ScoopInstaller/Extras/blob/master/bucket/inno-setup.json

此时安装目录不在C:\\Program Files (x86)\\Inno Setup 6，但iscc.exe仍然放进了$PATH环境变量中，可以在shell中直接执行
应该可以模仿flutter SDK调用git的方式

https://github.com/flutter/flutter/blob/f5825a22a47969ce9fec303dbefee035eadb1acc/packages/flutter_tools/lib/src/globals.dart#L111
https://github.com/flutter/flutter/blob/master/packages/flutter_tools/lib/src/git.dart

不过确实不太懂dart语法，我猜改完的代码应该是这样……？

import 'dart:io';

import 'package:flutter_app_packager/src/makers/exe/inno_setup/inno_setup_script.dart';
import 'package:path/path.dart' as p;
import 'package:shell_executor/shell_executor.dart';

class InnoSetupCompiler {
  Future<bool> compile(InnoSetupScript script) async {
    Directory innoSetupDirectory =
        Directory('C:\\Program Files (x86)\\Inno Setup 6');

    // ✅ CHANGED: decide how to invoke ISCC:
    // - Prefer the original hard-coded location if it exists.
    // - Otherwise fall back to just "iscc" and let the OS resolve it from PATH.
    final String isccExecutable = File(p.join(innoSetupDirectory.path, 'ISCC.exe'))
            .existsSync()
        ? p.join(innoSetupDirectory.path, 'ISCC.exe')
        : 'iscc';

    // ✅ CHANGED: only throw when BOTH the hard-coded path is unavailable
    // and we also cannot find "iscc" on PATH (i.e., fallback would fail).
    if (isccExecutable == 'iscc') {
      final check = await Process.run(
        'iscc',
        ['/??'],
        runInShell: true,
      );
      if (check.exitCode != 0) {
        throw Exception(
          '`Inno Setup 6` was not installed or `iscc` was not found in PATH.',
        );
      }
    }

    File file = await script.createFile();

    // ✅ CHANGED: run resolved executable (absolute path OR "iscc" via PATH)
    ProcessResult processResult = await $(
      isccExecutable,
      [file.path],
    );

    if (processResult.exitCode != 0) {
      return false;
    }

    file.deleteSync(recursive: true);
    return true;
  }
}