[jira] [Created] (THRIFT-6026) Add Mermaid diagram generator (--gen mmd)

["Jens Geyer (Jira)" <ji...@apache.org>]

Jens Geyer created THRIFT-6026:
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             Summary: Add Mermaid diagram generator (--gen mmd)
                 Key: THRIFT-6026
                 URL: https://issues.apache.org/jira/browse/THRIFT-6026
             Project: Thrift
          Issue Type: New Feature
            Reporter: Jens Geyer


The Thrift compiler already ships a Graphviz generator (--gen gv) for visualising IDL type graphs. This ticket adds an analogous Mermaid classDiagram generator (--gen mmd) that produces .mmd files renderable natively on GitHub, GitLab, Confluence, Obsidian, and other platforms without requiring external tooling.

Features:
- All IDL constructs mapped to Mermaid classDiagram: enum (<<enumeration>>), struct (<<struct>>), union (<<union>>), exception (<<exception>>), typedef (<<typedef>>), service (<<service>>)
- Service extends rendered as inheritance arrows (--|>)
- Container generics using tilde syntax (list~T~, map~K,V~) for Mermaid compatibility
- Optional :exceptions flag to draw dashed dependency arrows from service functions to declared exception types
- When invoked with -r, the root program diagram aggregates types from all transitively included programs into a single output file
- Constants intentionally omitted (visual noise, no structural value in a type diagram)
- Output in gen-mmd/<programname>.mmd

Implementation: single new file compiler/cpp/src/thrift/generate/t_mmd_generator.cc plus one THRIFT_ADD_COMPILER entry in compiler/cpp/CMakeLists.txt. No library changes.



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