Ruby syntax highlighting seems very broken.

Description of the problem or steps to reproduce

Using a simple here document in ruby yields incredibly odd looking syntax highlighting.

Specifications

Micro:
Version: 2.0.10
Commit hash: b976385
Compiled on August 27, 2021

Console:
Vanilla Arch console accessed via ssh

[asmrtfm]

The main problem seems to be the inability to differentiate between '#' used for comments and '#' used for string interpolation.

I am completely unfamiliar with how to write lang definitions for syntax highlighting, but I have to imagine that something like regex is used; and so if the maintainers of this editor are simply unfamiliar with ruby, I can tell you in plain english what the rule/condition would need to be:

'#' occurring within an open set of quotation marks (which themselves behave essentially the same as bash's) should be treated as a variable, not a comment.

[Andriamanitra]

@asmrtfm The syntax highlighting system for micro is fairly simplistic and easy to learn (which is also why it tends to be so quirky/buggy for anything more complicated than highlighting keywords) – see the section on syntax files in help colors. The built-in syntax file for ruby is at runtime/syntax/ruby.yaml, and you can override it by placing a similar file at ~/.config/micro/syntax/ruby.yaml. I've made these changes in my ruby.yaml for highlighting string interpolation, and it seems to work at least a little better (but still far from perfect so I have not made a PR):

    - constant.string:
        start: "\""
        end: "\""
        skip: "\\\\."
        rules:
-            - symbol.brackets:
-                start: "#\\{"
-                end: "\\}"
-                rules:
-                    - default: ".*"
+            - default: "#\\{[^}]+\\}"
+            - statement: "#\\{"
+            - statement: "\\}"