Add Blueprint language

[kaypes]

Adds Blueprint (.blp) as a markup language - the descriptive user interface language for GTK4 and Libadwaita.

Description

Blueprint is a markup language designed for building GTK user interfaces. Created to replace verbose XML .ui files with a clean and human-readable syntax, it is heavily used by modern Linux app developers in the GNOME ecosystem. Despite its widespread adoption and support in tools like GNOME Builder and Workbench, it currently lacks language recognition and syntax highlighting on GitHub.

• Grammar repo: https://github.com/kaypes/blueprint-grammar
• Scope: source.blueprint
• Color: #3584E4 (Adwaita default)

Checklist:

• I am adding a new language.
  • The extension of the new language is used in hundreds of repositories on GitHub.com.
    • Search results for each extension:
      • https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*.blp+using+Gtk
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
    • 2 original samples demonstrating simple windows, UI signals, and Libadwaita widgets.
    • Sample license(s): Unlicense / MIT
  • I have included a syntax highlighting grammar: https://github.com/kaypes/blueprint-grammar
  • I have added a color
    • Hex value: #3584E4
    • Rationale: Official GNOME blue, the standard accent color used across GNOME HIG (Human Interface Guidelines) and Libadwaita.
  • I have updated the heuristics to distinguish my language from others using the same extension.
    • No heuristics needed - .blp is not used by any other language in Linguist.

[lildude]

We cannot accept the grammar you are proposing due to it's license. We can only accept grammars with one of these licenses as called out in the CONTRIBUTING.md file.

[kaypes]

I wrote a brand new grammar under the MIT license to fix the issue

[lildude]

Looks like you didn't use the script/add-grammar to replace the grammar as the test failure illustrates and my previous comment.

Please do so. You can find details for replacing a grammar in the CONTRIBUTING.md file… you can replace a grammar with itself.

[Alhadis]

No longer relevant, please ignore.

@kaypes I've fixed your pull-request locally, but you need to give me write access to your Linguist fork:

λ GitHub-Linguist (blueprint): git push -u fork
Enumerating objects: 25, done.
Counting objects: 100% (25/25), done.
Delta compression using up to 16 threads
Compressing objects: 100% (16/16), done.
Writing objects: 100% (16/16), 1.47 KiB | 1.47 MiB/s, done.
Total 16 (delta 10), reused 0 (delta 0), pack-reused 0 (from 0)
remote: Resolving deltas: 100% (10/10), completed with 7 local objects.
To github.com:kaypes/linguist.git
 ! [remote rejected]   blueprint -> blueprint (permission denied)
error: failed to push some refs to 'github.com:kaypes/linguist.git'

The issue appeared to be with your submodule's version history. The commits it was referencing didn't exist (I'm guessing you must've force-pushed to kaypes/blueprint-grammar or something, leaving Linguist with its own—now unique—copy of the submodule, entirely divorced from your branch).

EDIT: Whoops, never mind. It was a misconfigured remote on my part. I've pushed the fixes to your branch.

I gave old mate a helping hand.