improve lexers/shell.rb

[rindeal]

This patches adds support for Gentoo and Exherbo package build recipes. It also sets proper mime-type to shell files.

[pyrmont]

@rindeal Thanks for your work on this! It doesn't look like maintainers have the ability to push code to the relevant branch of your fork so apologies for not being able to make these changes myself.

To get the checks to pass, you need to update the MIME type section of spec/lexers/shell_spec.rb to something like this:

     it 'guesses by mimetype' do
-      assert_guess :mimetype => 'application/x-shellscript'
+      assert_guess :mimetype => 'text/x-sh'
+      assert_guess :mimetype => 'text/x-shellscript'
     end

In addition, if you could update the list of filename globs in lib/rouge/lexers/shell.rb so that it's a bit neater, that'd be great, too. Something like this:

       tag 'shell'
       aliases 'bash', 'zsh', 'ksh', 'sh'
-      filenames '*.sh', '*.bash', '*.zsh', '*.ksh',
-                '.bashrc', '.zshrc', '.kshrc', '.profile', 'APKBUILD', 'PKGBUILD'
+      filenames '*.sh', '*.bash', '*.zsh', '*.ksh', '.bashrc', '.zshrc',
+                '.kshrc', '.profile', 'APKBUILD', 'PKGBUILD', '*.ebuild',
+                '*.eclass', '*.exheres-0', '*.exlib'

Let me know if anything is unclear!

[pyrmont]

Question about the change to the MIME types:

[pyrmont]

@rindeal Hey, it took two years but we finally got this one closed! 🎉 Thanks for contributing to Rouge :)

[rindeal]

Yes, thank you very much.