.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/adapter/linux.rb:30:in `require': cannot load such file -- rb-inotify (LoadError)

[GabLeRoux]

Just installed the gem and having the following error:

$ github-markdown-preview test.md 
Preview available at file:///home/gableroux/test.md.html
/home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/adapter/linux.rb:30:in `require': cannot load such file -- rb-inotify (LoadError)
        from /home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/adapter/linux.rb:30:in `_configure'
        from /home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/adapter/base.rb:45:in `block in configure'
        from /home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/adapter/base.rb:40:in `each'
        from /home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/adapter/base.rb:40:in `configure'
        from /home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/adapter/base.rb:63:in `start'
        from /home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/backend.rb:26:in `start'
        from /home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/listener.rb:67:in `block in <class:Listener>'
        from /home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/fsm.rb:120:in `instance_eval'
        from /home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/fsm.rb:120:in `call'
        from /home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/fsm.rb:91:in `transition_with_callbacks!'
        from /home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/fsm.rb:57:in `transition'
        from /home/gableroux/.gem/ruby/2.3.0/gems/listen-3.0.3/lib/listen/listener.rb:90:in `start'
        from /home/gableroux/.gem/ruby/2.3.0/gems/github-markdown-preview-4.0.2/lib/github-markdown-preview/html_preview.rb:144:in `start_watch'
        from /home/gableroux/.gem/ruby/2.3.0/gems/github-markdown-preview-4.0.2/lib/github-markdown-preview/html_preview.rb:129:in `watch!'
        from /home/gableroux/.gem/ruby/2.3.0/gems/github-markdown-preview-4.0.2/bin/github-markdown-preview:48:in `<top (required)>'
        from /home/gableroux/.gem/ruby/2.3.0/bin/github-markdown-preview:22:in `load'
        from /home/gableroux/.gem/ruby/2.3.0/bin/github-markdown-preview:22:in `<main>'

https://github.com/guard/listen/blob/v3.0.8/lib/listen/adapter/linux.rb#L30

Points to:
https://github.com/nex3/rb-inotify

$ ruby --version                            
ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-linux]

$ uname -a
Linux zbookarch.local 4.8.13-1-ARCH #1 SMP PREEMPT Fri Dec 9 07:24:34 CET 2016 x86_64 GNU/Linux

$ gem --version                                           
2.5.2

$ github-markdown-preview --version                               
github-markdown-preview version 4.0.2
$ gem list | grep github-markdown-preview
github-markdown-preview (4.0.2)

$ gem list | grep rb-inotify 
rb-inotify (0.9.7, 0.9.5)

That's probably an issue with https://github.com/guard/listen though.

[dmarcotte]

Thanks for filing this @GabLeRoux. I was unable to reproduce, but I'm using a mac rather than linux, so possibly that's the difference. Also my gem version is higher than yours:

$ gem --version
2.6.8

Everything else is the same. Does upgrading gem fix you up by any chance?

[GabLeRoux]

Well I usually have a lot of problems installing gems using system gem anyway. I Updated pretty much everything and moved to rbenv instead.

$ ruby --version
ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]

$ gem --version
2.6.8

$  gem install github-markdown-preview
Building native extensions.  This could take a while...
ERROR:  Error installing github-markdown-preview:
        ERROR: Failed to build gem native extension.

    current directory: /home/gableroux/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/json-1.8.3/ext/json/ext/generator
/home/gableroux/.rbenv/versions/2.4.0/bin/ruby -r ./siteconf20170102-28261-1l5jhv7.rb extconf.rb
creating Makefile

current directory: /home/gableroux/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/json-1.8.3/ext/json/ext/generator
make "DESTDIR=" clean

current directory: /home/gableroux/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/json-1.8.3/ext/json/ext/generator
make "DESTDIR="
compiling generator.c
generator.c: In function ‘generate_json’:
generator.c:861:25: error: ‘rb_cFixnum’ undeclared (first use in this function)
     } else if (klass == rb_cFixnum) {
                         ^~~~~~~~~~
generator.c:861:25: note: each undeclared identifier is reported only once for each function it appears in
generator.c:863:25: error: ‘rb_cBignum’ undeclared (first use in this function)
     } else if (klass == rb_cBignum) {
                         ^~~~~~~~~~
generator.c: At top level:
cc1: warning: unrecognized command line option ‘-Wno-self-assign’
cc1: warning: unrecognized command line option ‘-Wno-constant-logical-operand’
cc1: warning: unrecognized command line option ‘-Wno-parentheses-equality’
make: *** [Makefile:242: generator.o] Error 1

make failed, exit code 2

Gem files will remain installed in /home/gableroux/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/json-1.8.3 for inspection.
Results logged to /home/gableroux/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/extensions/x86_64-linux/2.4.0-static/json-1.8.3/gem_make.out

Package can also be installed from the aur tho.

$ sudo aura -A ruby-github-markdown-preview                                             
aura >>= Determining dependencies...
aura >>= Dependency checking failed for these reasons:
The dependency `ruby-github-markdown` could not be found. You may need to search for a package to satisfy it.

At least, building it myself did work in the end.

$ git clone git@github.com:dmarcotte/github-markdown-preview.git
$ cd github-markdown-preview
$ rbenv install 2.4.0
$ rbenv local 2.4.0
$ rbenv local
$ ruby --version                                              
ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]
$ gem --version                      
2.6.8
$ bundle install
$ bundle exec bin/github-markdown-preview readme.md

🌮 🎉 Initial problem isn't really solved but it's ok for me, feel free to close this issue ;)

[dmarcotte]

Thanks @GabLeRoux. Glad you got sorted, though it's too bad you hit the bump in the first place. Thanks for your patience, and hope the previews serve you well.

[andyneff]

I had this problem too, using the rubygem/github-markdown-preview docker.

Not a ruby guy, but it turns out this problem only occurs if there are multiple versions of rb-inotify installed (with my setup at least, and I was using debian:8, ubuntu:16.04, and the rubygem/github-markdown-preview images, and they all had the same issue)

So following the instructions:

BUNDLE_GEMFILE=Gemfile.optional bundle install

On a clean system has a chance of creating this issue. Since rb-inotify may have already been installed as a older version, and running bundle install again, will install the newer version if available.

However,

gem install github-linguist -v 3.3.1 # 3.3.1 is required
gem install rugged -v 0.23.0 # undeclared dependency of linguist

On a clean system will not.

So while this can be solved on a "clean" system, I still don't know the solution on a normal system.

[GabLeRoux]

@andyneff Did you try using rbenv like I did?

I don't think I can help you much here, I just tried again with the above commands (#45 (comment)) on a new system with the above commands, I had some errors on Macos, see #46, but I managed to get it working again. It installed rb-inotify 0.9.7 correctly.

[andyneff]

@GabLeRoux rbenv is not available in the docker images by default, so I didn't even try it. I was just trying to add more information to this issue rather than trying to solve it for myself.

If rbenv is similar python's virtualenv it would be consistent with what I was saying. In the rbenv, there will only be one version of rb-inotify, and for some reason having two versions of rb-inotify causes this problem. I would imagine if you had two versions of rb-inotify in your rbenv, you would be back to having the error message again (if rbenv even allows multiple versions of the same library, which apparently gem does allow)