Hexo-theme-next: Mathjax : pandoc exited with code null (pandoc-2.9.2.1 already installed in my laptop)

[TITC]

Please follow this Issue template to provide relevant information, such as source code repositories, blog links, and screenshots, which will help us investigate.
请按照此 Issue 模版提供相关信息，例如源码仓库、博客链接和屏幕截图，这将有助于我们进行调查。

Issue Checklist

• [x] I have read the relevant documents of Hexo and NexT.
• [x] I am using the latest version of NexT.
• [x] I have reviewed the latest Roadmap on GitHub and searched for current issues, which does not help me.

---

Expected behavior

the server will start successfully when I run hexo server command

Actual behavior

$ hexo server
INFO  Start processing
INFO  Hexo is running at http://localhost:4000 . Press Ctrl+C to stop.
Unhandled rejection Error: 
[ERROR][hexo-renderer-pandoc] On G:\Users\yuhang.tao\Documents\GitHub\test\source\_posts\hello-world.md
[ERROR][hexo-renderer-pandoc] pandoc exited with code null.
    at Hexo.pandocRenderer (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\hexo-renderer-pandoc\index.js:114:11)
    at Hexo.tryCatcher (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\util.js:16:23)
    at Hexo.<anonymous> (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\method.js:15:34)
    at G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\hexo\lib\hexo\render.js:75:22
    at tryCatcher (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\util.js:16:23)
    at Promise._settlePromiseFromHandler (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:547:31)
    at Promise._settlePromise (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:604:18)
    at Promise._settlePromiseCtx (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:641:10)
    at _drainQueueStep (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:97:12)
    at _drainQueue (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:86:9)
    at Async._drainQueues (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:102:5)
    at Immediate.Async.drainQueues [as _onImmediate] (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:15:14)
    at processImmediate (internal/timers.js:456:21)

INFO  Have a nice day

yuhang.tao@Elf MINGW64 ~/test
$ hexo server
INFO  Start processing
FATAL Something's wrong. Maybe you can find the solution here: https://hexo.io/docs/troubleshooting.html
Error: 
[ERROR][hexo-renderer-pandoc] On G:\Users\yuhang.tao\Documents\GitHub\test\source\_posts\hello-world.md
[ERROR][hexo-renderer-pandoc] pandoc exited with code null.
    at Hexo.pandocRenderer (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\hexo-renderer-pandoc\index.js:114:11)
    at Hexo.tryCatcher (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\util.js:16:23)
    at Hexo.<anonymous> (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\method.js:15:34)
    at G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\hexo\lib\hexo\render.js:75:22
    at tryCatcher (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\util.js:16:23)
    at Promise._settlePromiseFromHandler (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:547:31)
    at Promise._settlePromise (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:604:18)
    at Promise._settlePromiseCtx (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:641:10)
    at _drainQueueStep (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:97:12)
    at _drainQueue (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:86:9)
    at Async._drainQueues (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:102:5)
    at Immediate.Async.drainQueues [as _onImmediate] (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:15:14)
    at processImmediate (internal/timers.js:456:21)

• Links to demo site with this issue: N/A
  the server can't run ,so I can't supply any demo site
• Links to repository or source code of the blog: N/A
  the blog is inite just now and hasn't adjusted anything.

Steps to reproduce the behavior

1.

 hexo init test
cd test
git clone https://github.com/theme-next/hexo-theme-next themes/next
hexo server

run normally

1. change the hexo configure file theme's value to next

hexo server

run normally

3.

npm un hexo-renderer-marked
npm i hexo-renderer-pandoc
hexo server

run normally

1. open hello-wold.md,then plus Ctrl+S

$ hexo server
INFO  Start processing
INFO  Hexo is running at http://localhost:4000 . Press Ctrl+C to stop.
Unhandled rejection Error: 
[ERROR][hexo-renderer-pandoc] On G:\Users\yuhang.tao\Documents\GitHub\test\source\_posts\hello-world.md
[ERROR][hexo-renderer-pandoc] pandoc exited with code null.
    at Hexo.pandocRenderer (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\hexo-renderer-pandoc\index.js:114:11)
    at Hexo.tryCatcher (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\util.js:16:23)
    at Hexo.<anonymous> (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\method.js:15:34)
    at G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\hexo\lib\hexo\render.js:75:22
    at tryCatcher (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\util.js:16:23)
    at Promise._settlePromiseFromHandler (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:547:31)
    at Promise._settlePromise (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:604:18)
    at Promise._settlePromiseCtx (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:641:10)
    at _drainQueueStep (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:97:12)
    at _drainQueue (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:86:9)
    at Async._drainQueues (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:102:5)
    at Immediate.Async.drainQueues [as _onImmediate] (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:15:14)
    at processImmediate (internal/timers.js:456:21)

Unhandled rejection Error: 
[ERROR][hexo-renderer-pandoc] On G:\Users\yuhang.tao\Documents\GitHub\test\source\_posts\hello-world.md
[ERROR][hexo-renderer-pandoc] pandoc exited with code null.
    at Hexo.pandocRenderer (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\hexo-renderer-pandoc\index.js:114:11)
    at Hexo.tryCatcher (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\util.js:16:23)
    at Hexo.<anonymous> (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\method.js:15:34)
    at G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\hexo\lib\hexo\render.js:75:22
    at tryCatcher (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\util.js:16:23)
    at Promise._settlePromiseFromHandler (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:547:31)
    at Promise._settlePromise (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:604:18)
    at Promise._settlePromiseCtx (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:641:10)
    at _drainQueueStep (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:97:12)
    at _drainQueue (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:86:9)
    at Async._drainQueues (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:102:5)
    at Immediate.Async.drainQueues [as _onImmediate] (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:15:14)
    at processImmediate (internal/timers.js:456:21)

Environment Information

Node.js and NPM Information

$ node -v && npm -v
v12.16.1
6.13.4

Package dependencies Information

$ npm ls --depth 0
[email protected] G:\Users\yuhang.tao\Documents\GitHub\test
+-- [email protected]
+-- [email protected]
+-- [email protected]
+-- [email protected]
+-- [email protected]
+-- [email protected]
+-- [email protected]
+-- [email protected]
`-- [email protected]

Hexo Configuration

# Hexo Configuration
## Docs: https://hexo.io/docs/configuration.html
## Source: https://github.com/hexojs/hexo/

# Site
title: Hexo
subtitle: ''
description: ''
keywords:
author: John Doe
language: en
timezone: ''

# URL
## If your site is put in a subdirectory, set url as 'http://yoursite.com/child' and root as '/child/'
url: http://yoursite.com
root: /
permalink: :year/:month/:day/:title/
permalink_defaults:
pretty_urls:
  trailing_index: true # Set to false to remove trailing 'index.html' from permalinks
  trailing_html: true # Set to false to remove trailing '.html' from permalinks

# Directory
source_dir: source
public_dir: public
tag_dir: tags
archive_dir: archives
category_dir: categories
code_dir: downloads/code
i18n_dir: :lang
skip_render:

# Writing
new_post_name: :title.md # File name of new posts
default_layout: post
titlecase: false # Transform title into titlecase
external_link:
  enable: true # Open external links in new tab
  field: site # Apply to the whole site
  exclude: ''
filename_case: 0
render_drafts: false
post_asset_folder: false
relative_link: false
future: true
highlight:
  enable: true
  line_number: true
  auto_detect: false
  tab_replace: ''
  wrap: true
  hljs: false

# Home page setting
# path: Root path for your blogs index page. (default = '')
# per_page: Posts displayed per page. (0 = disable pagination)
# order_by: Posts order. (Order by date descending by default)
index_generator:
  path: ''
  per_page: 10
  order_by: -date

# Category & Tag
default_category: uncategorized
category_map:
tag_map:

# Metadata elements
## https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta
meta_generator: true

# Date / Time format
## Hexo uses Moment.js to parse and display date
## You can customize the date format as defined in
## http://momentjs.com/docs/#/displaying/format/
date_format: YYYY-MM-DD
time_format: HH:mm:ss
## Use post's date for updated date unless set in front-matter
use_date_for_updated: false

# Pagination
## Set per_page to 0 to disable pagination
per_page: 10
pagination_dir: page

# Include / Exclude file(s)
## include:/exclude: options only apply to the 'source/' folder
include:
exclude:
ignore:

# Extensions
## Plugins: https://hexo.io/plugins/
## Themes: https://hexo.io/themes/
theme: next

# Deployment
## Docs: https://hexo.io/docs/deployment.html
deploy:
  type: ''

NexT Configuration

I haven't change anything, just init it.~~~

Errata

# Math Formulas Render Support
math:
  # Default (true) will load mathjax / katex script on demand.
  # That is it only render those page which has `mathjax: true` in Front-matter.
  # If you set it to false, it will load mathjax / katex srcipt EVERY PAGE.
  per_page: true

  # hexo-renderer-pandoc (or hexo-renderer-kramed) required for full MathJax support.
  mathjax:
    enable: true
    # See: https://mhchem.github.io/MathJax-mhchem/
    mhchem: false

Other Information

[welcome[bot]]

Thanks for opening this issue, maintainers will get back to you as soon as possible!

[sli1989]

did u install the pandoc?

[TITC]

Thanks for your reply

as my question described, pandoc-2.9.2.1 already installed in my laptop.

Mathjax : pandoc exited with code null (pandoc-2.9.2.1 already installed in my laptop)

did u install the pandoc?

[TITC]

PS C:\Users\yuhang.tao> pandoc --version
pandoc.exe 2.9.2.1
Compiled with pandoc-types 1.20, texmath 0.12.0.1, skylighting 0.8.3.2
Default user data directory: C:\Users\yuhang.tao\AppData\Roaming\pandoc
Copyright (C) 2006-2020 John MacFarlane
Web:  https://pandoc.org
This is free software; see the source for copying conditions.
There is no warranty, not even for merchantability or fitness
for a particular purpose.

[sli1989]

NexT Configuration I haven't change anything, just init it.

how about enable this? https://github.com/theme-next/hexo-theme-next/blob/ca19a9d82dba6521ee7b9cb2befda51c6a1bd063/_config.yml#L503

[TITC]

I have enabled this option in my personal blog, I forget to add this description in this issue.

Now I reproduce it again

hexo init test
cd test
git clone https://github.com/theme-next/hexo-theme-next themes/next
npm un hexo-renderer-marked
npm i hexo-renderer-pandoc

then change the theme value to next

# Extensions
## Plugins: https://hexo.io/plugins/
## Themes: https://hexo.io/themes/
theme: next

and change the mathjax option in NexT configure file

# Math Formulas Render Support
math:
  # Default (true) will load mathjax / katex script on demand.
  # That is it only render those page which has `mathjax: true` in Front-matter.
  # If you set it to false, it will load mathjax / katex srcipt EVERY PAGE.
  per_page: true

  # hexo-renderer-pandoc (or hexo-renderer-kramed) required for full MathJax support.
  mathjax:
    enable: true
    # See: https://mhchem.github.io/MathJax-mhchem/
    mhchem: false

last

hexo server

and git bash output below

yuhang.tao@Elf MINGW64 ~/test
$ hexo server
INFO  Start processing
FATAL Something's wrong. Maybe you can find the solution here: https://hexo.io/docs/troubleshooting.html
Error: 
[ERROR][hexo-renderer-pandoc] On G:\Users\yuhang.tao\Documents\GitHub\test\source\_posts\hello-world.md
[ERROR][hexo-renderer-pandoc] pandoc exited with code null.
    at Hexo.pandocRenderer (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\hexo-renderer-pandoc\index.js:114:11)
    at Hexo.tryCatcher (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\util.js:16:23)
    at Hexo.<anonymous> (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\method.js:15:34)
    at G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\hexo\lib\hexo\render.js:75:22
    at tryCatcher (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\util.js:16:23)
    at Promise._settlePromiseFromHandler (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:547:31)
    at Promise._settlePromise (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:604:18)
    at Promise._settlePromiseCtx (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\promise.js:641:10)
    at _drainQueueStep (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:97:12)
    at _drainQueue (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:86:9)
    at Async._drainQueues (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:102:5)
    at Immediate.Async.drainQueues [as _onImmediate] (G:\Users\yuhang.tao\Documents\GitHub\test\node_modules\bluebird\js\release\async.js:15:14)
    at processImmediate (internal/timers.js:456:21)

NexT Configuration I haven't change anything, just init it.

how about enable this?

https://github.com/theme-next/hexo-theme-next/blob/ca19a9d82dba6521ee7b9cb2befda51c6a1bd063/_config.yml#L503

[TITC]

Appendix:

here is another user who encountered similar problem mathjax problem but he choose just not use it.

[TITC]

maybe you can reproduce it just in a few minutes, as I think.

[sli1989]

i have no idea about this. i am a pandoc user, it works fine.
waiting for other's help.

[sli1989]

any attemps more?

[TITC]

following your previous advice, waiting for other's help

---

the problem still exists in my case and some others finisky.blog

[sli1989]

well, maybe reinit and uninstal and install. wish

[TITC]

my issue described scene already starts from scratch ...

[rexwangcc]

I run into a similar issue while building a Github Action for deployment, the issue turned out to be the Docker image for the action doesn't have pandoc installed.

That said, I have walked through your issue description and have tried to reproduce it:

hexo init test && cd test
git clone https://github.com/theme-next/hexo-theme-next themes/next
# enable the mathjax within /theme/next/_config.yml
hexo s

and everything looks good. At this point, the only problem I could think of is the distribution of pandoc might be different between Windows and macOS/Linux. Posting the versions on my box here in case it helps:

➜  test npm list | grep hexo
[email protected] /Users/***/***/playground/test
├─┬ [email protected]
│ ├─┬ [email protected]
│ │ ├── [email protected] deduped
│ │ ├── [email protected] deduped
│ │ ├── [email protected] deduped
│ ├─┬ [email protected]
│ ├─┬ [email protected]
│ ├─┬ [email protected]
│ ├─┬ [email protected]
│ │ └─┬ [email protected]
│ ├─┬ [email protected]
├─┬ [email protected]
│ └── [email protected]
├─┬ [email protected]
│ └── [email protected] deduped
├─┬ [email protected]
│ └── [email protected] deduped
├─┬ [email protected]
│ └── [email protected] deduped
├─┬ [email protected]
├── [email protected]
├─┬ [email protected]
└─┬ [email protected]

and

➜  test brew info pandoc
pandoc: stable 2.9.2.1 (bottled), HEAD
Swiss-army knife of markup format conversion
https://pandoc.org/
/usr/local/Cellar/pandoc/2.9.2.1 (183 files, 102.8MB) *
  Poured from bottle on 2020-04-19 at 22:32:44
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/pandoc.rb
==> Dependencies
Build: cabal-install ✘, ghc ✘
==> Options
--HEAD
    Install HEAD version
==> Caveats
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d
==> Analytics
install: 23,091 (30 days), 83,850 (90 days), 273,914 (365 days)
install-on-request: 15,650 (30 days), 58,280 (90 days), 193,445 (365 days)
build-error: 0 (30 days)

[yangbai90]

For me, I solved this issue via the following way:
go to https://github.com/jgm/pandoc/releases/tag/2.9.2.1, download the newest version.
For me, I used the pandoc 2.9.2.1.deb for my ubuntu 18.04 system, then install it:

sudo dpkg -i pandoc.deb

after that, when I run:

hexo clean && hexo g && hexo s

everything works fine.

GitHub

jgm/pandoc

Universal markup converter. Contribute to jgm/pandoc development by creating an account on GitHub.

[TITC]

For me, I solved this issue via the following way:
go to https://github.com/jgm/pandoc/releases/tag/2.9.2.1, download the newest version.
For me, I used the pandoc 2.9.2.1.deb for my ubuntu 18.04 system, then install it:

sudo dpkg -i pandoc.deb

after that, when I run:

hexo clean && hexo g && hexo s

everything works fine.

GitHubjgm/pandocUniversal markup converter. Contribute to jgm/pandoc development by creating an account on GitHub.

Thanks, I will have a try.

GitHub

jgm/pandoc

Universal markup converter. Contribute to jgm/pandoc development by creating an account on GitHub.

[bxtx999]

maybe you should install pandoc in your PC, then restart your PC.

[MakerGYT]

you can try markdown-it-latex2img

[YuboZhang]

I got the same question in my hexo+next+travis.ci.
You can try to install the latest pandoc as below.

before_script:
   - wget https://github.com/jgm/pandoc/releases/download/2.10.1/pandoc-2.10.1-1-amd64.deb
   - sudo dpkg -i pandoc-2.10.1-1-amd64.deb
   - npm install hexo-renderer-pandoc --save  # for mathjax
   - npm install

This works for me.
Because hexo-renderer-pandoc is based on pandoc, so pandoc should be installed in advance.

[kqqian]

I got the same question in my hexo+next+travis.ci.
You can try to install the latest pandoc as below.

before_script:
   - wget https://github.com/jgm/pandoc/releases/download/2.10.1/pandoc-2.10.1-1-amd64.deb
   - sudo dpkg -i pandoc-2.10.1-1-amd64.deb
   - npm install hexo-renderer-pandoc --save  # for mathjax
   - npm install

This works for me.
Because hexo-renderer-pandoc is based on pandoc, so pandoc should be installed in advance.

slow download speed

[zlj-zz]

I had the same problem. I solved the problem by pressing pandoc