使用 Deno.run 以 7z 提取文件

Question

尝试编写一个小脚本来自动执行某些任务。选择 deno 作为一种很好的独立方式来执行我需要的随机自动化任务——以及一个学习机会。

我正在尝试做的一件事是使用 7z 提取存档，但我不明白为什么它不起作用。

let cmdProcess = Deno.run({
    cmd: ["7z", "e ProcessExplorer.zip"],
    stdout: "piped",
    stderr: "piped"
})
const output = await cmdProcess.output()
const outStr = new TextDecoder().decode(output);
console.log(outStr)

const errout = await cmdProcess.stderrOutput()
const errStr = new TextDecoder().decode(errout);
console.log(errStr)

7z 根据正常输出执行运行。但是无论我尝试将什么参数传递给 7z，我都会收到以下错误：

Command Line Error:
Unsupported command:
x ProcessExplorer.zip

无论我提供完整路径还是相对路径，或者我给出什么命令都没有关系。

我可能向 Deno.run 提供了错误的参数，但我无法 google Deno.run() 因为大多数搜索结果最终都是针对 deno run CLI 命令。

我在 Win 10 21H2.
deno v1.19.3

Answer 1

如果您将 e 子命令与参数 ProcessExplorer.zip:

分开，它应该可以工作

const cmdProcess = Deno.run({
  cmd: ["7z", "e", "ProcessExplorer.zip"],
  stdout: "piped",
  stderr: "piped",
});

使用 Deno.run 时，您需要将命令的所有不同 subcommands/options/flags 拆分为 cmd 数组中的单独字符串，如前所述

有关 Deno 命名空间 API 的文档，您可以在 https://doc.deno.land. For Deno.run specifically you can find it here 找到它。

Answer 2

这是使用 Deno 7z 提取档案的基本功能抽象：

./process.ts:

const decoder = new TextDecoder();

export type ProcessOutput = {
  status: Deno.ProcessStatus;
  stderr: string;
  stdout: string;
};

/**
 * Convenience wrapper around subprocess API.
 * Requires permission `--allow-run`.
 */
export async function getProcessOutput(cmd: string[]): Promise<ProcessOutput> {
  const process = Deno.run({ cmd, stderr: "piped", stdout: "piped" });

  const [status, stderr, stdout] = await Promise.all([
    process.status(),
    decoder.decode(await process.stderrOutput()),
    decoder.decode(await process.output()),
  ]);

  process.close();
  return { status, stderr, stdout };
}

./7z.ts:

import { getProcessOutput, type ProcessOutput } from "./process.ts";

export { type ProcessOutput };

// Ref: https://sevenzip.osdn.jp/chm/cmdline/index.htm
export type ExtractOptions = {
  /**
   * Extract nested files and folders to the same output directory.
   * Default: `false`
   */
  flat?: boolean;

  /**
   * Destination directory for extraction of archive contents.
   * 7-Zip replaces the `"*"` character with the name of the archive.
   * Default: (the current working directory)
   */
  outputDir?: string;

  /** Overwrite existing files. Default: `true` */
  overwrite?: boolean;
};

/**
 * Extract the contents of an archive to the filesystem using `7z`.
 * Requires `7z` to be in your `$PATH`.
 * Requires permission `--allow-run=7z`.
 *
 * @param archivePath - Path to the target archive file
 * @param options - Extraction options
 */
export function extractArchive(
  archivePath: string,
  options: ExtractOptions = {},
): Promise<ProcessOutput> {
  const {
    flat = false,
    outputDir,
    overwrite = true,
  } = options;

  const cmd = ["7z"];

  // https://sevenzip.osdn.jp/chm/cmdline/commands/extract.htm
  // https://sevenzip.osdn.jp/chm/cmdline/commands/extract_full.htm
  cmd.push(flat ? "e" : "x");

  // https://sevenzip.osdn.jp/chm/cmdline/switches/overwrite.htm
  cmd.push(overwrite ? "-aoa" : "-aos");

  // https://sevenzip.osdn.jp/chm/cmdline/switches/output_dir.htm
  if (outputDir) cmd.push(`-o${outputDir}`);

  // Disable interaction
  // https://sevenzip.osdn.jp/chm/cmdline/switches/yes.htm
  cmd.push("-y");

  cmd.push(archivePath);

  return getProcessOutput(cmd);
}

用法示例：

./main.ts:

import { extractArchive, type ExtractOptions } from "./7z.ts";

async function main() {
  const { status: { code, success }, stdout, stderr } = await extractArchive(
    "example.zip",
  );

  if (!success) { // Something went wrong
    console.error(`7-Zip exited with code: ${code}`);
    console.error(stderr);
    Deno.exit(1);
  }

  // Extraction was successful
  console.log(stdout);
}

if (import.meta.main) main();

> deno run --allow-run=7z main.ts
Check file:///C:/Users/deno/so-71445897/main.ts

7-Zip 21.07 (x64) : Copyright (c) 1999-2021 Igor Pavlov : 2021-12-26

Scanning the drive for archives:
1 file, 774 bytes (1 KiB)

Extracting archive: example.zip
--
Path = example.zip
Type = zip
Physical Size = 774

Everything is Ok

Folders: 3
Files: 2
Size:       38
Compressed: 774

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