用命令行把你的markdown转成PDF吧

这篇文章将介绍一个开源项目markdown-pdf的使用，以及遇到的一个无数个坑

前提

需要node.js环境，没有的请自行百度安装node.js

安装markdown-pdf

这一条是官网的安装教程
解释一下参数，npm是一个node.js的包管理工具，-g是全局安装，指安装后可以作为一个命令使用，--ignore-scripts是忽略一些脚本（package.json中的script）

npm install -g markdown-pdf --ignore-scripts

但是跑着跑着如果发现报错，原因是权限不足，我们在linux和macOS环境下需要sudo

sudo npm install -g markdown-pdf --ignore-scripts

终于成功装好了，赶紧试用一个

jabin@jabin-deepin ~/Code/tmp                                                                                                 [16:25:24] 
> $ markdown-pdf lesson01.md                                                                                                            
internal/validators.js:125
    throw new ERR_INVALID_ARG_TYPE(name, 'string', value);
    ^

TypeError [ERR_INVALID_ARG_TYPE]: The "file" argument must be of type string. Received type object
    at validateString (internal/validators.js:125:11)
    at normalizeSpawnArguments (child_process.js:399:3)
    at spawn (child_process.js:532:38)
    at Object.execFile (child_process.js:221:15)
    at WriteStream.<anonymous> (/usr/lib/node_modules/markdown-pdf/index.js:117:22)
    at WriteStream.emit (events.js:194:15)
    at finishMaybe (_stream_writable.js:641:14)
    at stream._final (_stream_writable.js:619:5)
    at WriteStream._final (internal/fs/streams.js:263:3)
    at callFinal (_stream_writable.js:612:10)

又发现了错误！这个错误的解决方法就是先卸载已经装好的模块，去掉--ignore-scripts重装一遍

卸载

sudo npm uninstall -g markdown-pdf

去掉参数重装

sudo npm install -g markdown-pdf

去掉参数之后，会被检测出来缺少一个模块phantomjs，然后脚本会自动安装，问题是，这个模块的下载速度奇慢无比，挂了10分钟甚至卡在8%不动了

jabin@jabin-deepin:~$ sudo npm install -g markdown-pdf
npm WARN deprecated phantomjs-prebuilt@2.1.16: this package is now deprecated
/usr/bin/markdown-pdf -> /usr/lib/node_modules/markdown-pdf/bin/markdown-pdf

> phantomjs-prebuilt@2.1.16 install /usr/lib/node_modules/markdown-pdf/node_modules/phantomjs-prebuilt
> node install.js

PhantomJS not found on PATH
Downloading https://github.com/Medium/phantomjs/releases/download/v2.1.1/phantomjs-2.1.1-linux-x86_64.tar.bz2
Saving to /tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2
Receiving...
  [===-------------------------------------] 8%

输出信息可以看到链接，尝试使用浏览器下载https://github.com/Medium/phantomjs/releases/download/v2.1.1/phantomjs-2.1.1-linux-x86_64.tar.bz2
发现速度非常慢，原因是中国特有的设施影响了我们的访问
可以看到脚本会下载资源，然后放在对应的路径，所以我们手动下载文件然后放在对应的路径，至于文件，你们可以到我的百度云下载，
linux、macOS、windows三版本汇总链接
链接: https://pan.baidu.com/s/1Ubxqe-RF_H_g5HJvc4CFmQ 提取码: qwbw
将文件下载好，放在对应的路径（比如我的输出为/tmp/phantomjs/文件夹下）

经过测试，macOS和linux的路径都是/tmp/phantomjs/

 jabin@jabin-deepin /tmp/phantomjs                                                                                             [17:00:07] 
> $ sudo npm install -g markdown-pdf                                                                                                    
npm WARN deprecated phantomjs-prebuilt@2.1.16: this package is now deprecated
/usr/bin/markdown-pdf -> /usr/lib/node_modules/markdown-pdf/bin/markdown-pdf

> phantomjs-prebuilt@2.1.16 install /usr/lib/node_modules/markdown-pdf/node_modules/phantomjs-prebuilt
> node install.js

PhantomJS not found on PATH
Download already available at /tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2
Verified checksum of previously downloaded file
Extracting tar contents (via spawned process)
Removing /usr/lib/node_modules/markdown-pdf/node_modules/phantomjs-prebuilt/lib/phantom
Copying extracted folder /tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2-extract-1570611629575/phantomjs-2.1.1-linux-x86_64 -> /usr/lib/node_modules/markdown-pdf/node_modules/phantomjs-prebuilt/lib/phantom
Phantom installation failed { [Error: EACCES: permission denied, link '/tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2-extract-1570611629575/phantomjs-2.1.1-linux-x86_64' -> '/usr/lib/node_modules/markdown-pdf/node_modules/phantomjs-prebuilt/lib/phantom']
  errno: -13,
  code: 'EACCES',
  syscall: 'link',
  path:
   '/tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2-extract-1570611629575/phantomjs-2.1.1-linux-x86_64',
  dest:
   '/usr/lib/node_modules/markdown-pdf/node_modules/phantomjs-prebuilt/lib/phantom' } Error: EACCES: permission denied, link '/tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2-extract-1570611629575/phantomjs-2.1.1-linux-x86_64' -> '/usr/lib/node_modules/markdown-pdf/node_modules/phantomjs-prebuilt/lib/phantom'
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! phantomjs-prebuilt@2.1.16 install: `node install.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the phantomjs-prebuilt@2.1.16 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2019-10-09T09_00_32_201Z-debug.log

发现还是报错，尽管sudo了，还是permission denied，这需要我们在后面加上参数--unsafe-perm，执行sudo npm install -g markdown-pdf --unsafe-perm

jabin@jabin-deepin /usr/lib/node_modules                                                                                       [18:32:58] 
> $ sudo npm install -g markdown-pdf --unsafe-perm                                                                                       
npm WARN deprecated phantomjs-prebuilt@2.1.16: this package is now deprecated
/usr/bin/markdown-pdf -> /usr/lib/node_modules/markdown-pdf/bin/markdown-pdf

> phantomjs-prebuilt@2.1.16 install /usr/lib/node_modules/markdown-pdf/node_modules/phantomjs-prebuilt
> node install.js

PhantomJS not found on PATH
Download already available at /tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2
Verified checksum of previously downloaded file
Extracting tar contents (via spawned process)
Removing /usr/lib/node_modules/markdown-pdf/node_modules/phantomjs-prebuilt/lib/phantom
Copying extracted folder /tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2-extract-1570617196654/phantomjs-2.1.1-linux-x86_64 -> /usr/lib/node_modules/markdown-pdf/node_modules/phantomjs-prebuilt/lib/phantom
Writing location.js file
Done. Phantomjs binary available at /usr/lib/node_modules/markdown-pdf/node_modules/phantomjs-prebuilt/lib/phantom/bin/phantomjs
+ markdown-pdf@10.0.0
added 106 packages from 381 contributors in 13.885s
                                                                                                                                          
jabin@jabin-deepin /usr/lib/node_modules                                                                                       [18:33:19] 
> $

试用

jabin@jabin-deepin ~/Code/tmp                                                                                                  [18:37:36] 
> $ markdown-pdf lesson01.md

效果

md转pdf

下一篇会尝试更换主题～～