pw_docgen: Add sphinxcontrib-mermaid

This allows for embedding mermaid diagrams in rst files. It uses
https://github.com/mgaitan/sphinxcontrib-mermaid

For example:

.. mermaid::

   sequenceDiagram
      participant Alice
      participant Bob
      Alice->John: Hello John, how are you?
      loop Healthcheck
          John->John: Fight against hypochondria
      end
      Note right of John: Rational thoughts <br/>prevail...
      John-->Alice: Great!
      John->Bob: How about you?
      Bob-->John: Jolly good!

Change-Id: I04ee218cfb6e3a6cfdd3f3e189a5a632d5628bee
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/44021
Reviewed-by: Rob Mohr <mohrr@google.com>
Commit-Queue: Anthony DiGirolamo <tonymd@google.com>
3 files changed
tree: f09905235226761347e1e381882cd3c1f2614350
  1. build_overrides/
  2. docker/
  3. docs/
  4. pw_allocator/
  5. pw_analog/
  6. pw_arduino_build/
  7. pw_assert/
  8. pw_assert_basic/
  9. pw_assert_log/
  10. pw_base64/
  11. pw_bloat/
  12. pw_blob_store/
  13. pw_boot_armv7m/
  14. pw_build/
  15. pw_bytes/
  16. pw_checksum/
  17. pw_chrono/
  18. pw_chrono_embos/
  19. pw_chrono_freertos/
  20. pw_chrono_stl/
  21. pw_chrono_threadx/
  22. pw_cli/
  23. pw_containers/
  24. pw_cpu_exception/
  25. pw_cpu_exception_cortex_m/
  26. pw_docgen/
  27. pw_doctor/
  28. pw_env_setup/
  29. pw_fuzzer/
  30. pw_hdlc/
  31. pw_hex_dump/
  32. pw_i2c/
  33. pw_interrupt/
  34. pw_interrupt_cortex_m/
  35. pw_kvs/
  36. pw_libc/
  37. pw_log/
  38. pw_log_basic/
  39. pw_log_multisink/
  40. pw_log_null/
  41. pw_log_rpc/
  42. pw_log_sink/
  43. pw_log_tokenized/
  44. pw_malloc/
  45. pw_malloc_freelist/
  46. pw_metric/
  47. pw_minimal_cpp_stdlib/
  48. pw_module/
  49. pw_multisink/
  50. pw_package/
  51. pw_persistent_ram/
  52. pw_polyfill/
  53. pw_preprocessor/
  54. pw_presubmit/
  55. pw_protobuf/
  56. pw_protobuf_compiler/
  57. pw_random/
  58. pw_result/
  59. pw_ring_buffer/
  60. pw_router/
  61. pw_rpc/
  62. pw_snapshot/
  63. pw_span/
  64. pw_status/
  65. pw_stream/
  66. pw_string/
  67. pw_sync/
  68. pw_sync_baremetal/
  69. pw_sync_embos/
  70. pw_sync_freertos/
  71. pw_sync_stl/
  72. pw_sync_threadx/
  73. pw_sys_io/
  74. pw_sys_io_arduino/
  75. pw_sys_io_baremetal_lm3s6965evb/
  76. pw_sys_io_baremetal_stm32f429/
  77. pw_sys_io_stdio/
  78. pw_target_runner/
  79. pw_thread/
  80. pw_thread_embos/
  81. pw_thread_freertos/
  82. pw_thread_stl/
  83. pw_thread_threadx/
  84. pw_tokenizer/
  85. pw_tool/
  86. pw_toolchain/
  87. pw_trace/
  88. pw_trace_tokenized/
  89. pw_unit_test/
  90. pw_varint/
  91. pw_watch/
  92. pw_web_ui/
  93. targets/
  94. third_party/
  95. .bazelignore
  96. .bazelrc
  97. .clang-format
  98. .eslintrc.json
  99. .gitattributes
  100. .gitignore
  101. .gn
  102. .prettierrc.js
  103. .pylintrc
  104. activate.bat
  105. AUTHORS
  106. bootstrap.bat
  107. bootstrap.sh
  108. BUILD
  109. BUILD.gn
  110. BUILDCONFIG.gn
  111. CMakeLists.txt
  112. LICENSE
  113. modules.gni
  114. OWNERS
  115. package.json
  116. PW_PLUGINS
  117. README.md
  118. tsconfig.json
  119. WORKSPACE
  120. yarn.lock
README.md

See our website: http://pigweed.dev