imgui_md (markdown render) integration: introduction and acknowledgements

[pthom]

imgui_md is a recent markdown renderer for Dear ImGui using md4c parser.

Custom wrapper for ImGui Bundle

ImGui Bundle works to a heavily customized wrapper around imgui_md.

This wrapper offers the following additional customizations to imgui_md:

• Portable callback to open http links via the user default browser
• Default callback to load local images via hello_imgui
• Default callback to load the required fonts for rendering italic, bold, and header sizes
• Default set of fonts to render headers, code blocks, etc
• Render a markdown string after removing its main indentation, so that it is possible to inline markdown code in C++ via multi-line strings, for example:

    ImGui::RenderUnindented(R"(
       # Title
       Some content...
    )");

• Render code blocks via ImGuiColorTextEdit, with syntax coloring and a "Copy" button

Python bindings

See imgui_md.pyi

Example usage with ImmApp

• In C++
• In python

Online interactive demo of this code

Fork

ImGui Bundle uses a fork of imgui_md on the imgui_bundle branch.

Full diff

Most of these change can be backported to imgui_md, and PRs about them will be emitted.