rename: midi2_cpp -> midi2cpp

In deference to starfishmod/MIDI2_CPP (maintained since 2021 by
Andrew Mee, MIDI Association TSB Rep), which operates in the same
domain (MIDI 2.0 wrappers for embedded). Keeping the namespaces
disjoint avoids confusion in package managers and search.

Touches across 119 files:

- library.properties: name= + includes=
- library.json: "name", "headers", repository URL
- CMakeLists.txt: project / add_library / alias / install / export
- src/midi2_cpp.h -> src/midi2cpp.h
- logo_midi2_cpp.png -> logo_midi2cpp.png
- Preprocessor macros: MIDI2_CPP_* -> MIDI2CPP_*
  (MIDI2_CPP_BUILD_TESTS, MIDI2_CPP_ROOT, MIDI2_CPP_MAX_PROFILES,
  MIDI2_CPP_MAX_PROPERTIES, MIDI2_CPP_MAX_SUBSCRIBERS,
  MIDI2_CPP_HOST_MAX_DEVICES, MIDI2_CPP_BRIDGE_MAX_SLOTS, ...)
- 20 example recipes: CMakeLists.txt / idf/main/CMakeLists.txt /
  pio/platformio.ini
- README, CHANGELOG, every example README
- .github/workflows/ci.yml: paths and CMake options

Verified locally: cmake configure + build + ctest all green (7/7
host suites, including the m2bridge ASan + UBSan smoke).

Follow-up commits will bump the version to v0.3.0, refresh the
CHANGELOG with this rationale, and (after the merge) rename the
GitHub repo via gh repo rename.

Author: sauloverissimo

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Configure
-        run: cmake -B build -DMIDI2_CPP_BUILD_TESTS=ON
+        run: cmake -B build -DMIDI2CPP_BUILD_TESTS=ON
 
       - name: Build
         run: cmake --build build --parallel
@@ -43,7 +43,7 @@ jobs:
         env:
           CC: ${{ matrix.compiler.cc }}
           CXX: ${{ matrix.compiler.cxx }}
-        run: cmake -B build -DMIDI2_CPP_BUILD_TESTS=ON
+        run: cmake -B build -DMIDI2CPP_BUILD_TESTS=ON
 
       - name: Build with -Werror
         run: cmake --build build --parallel -- CXXFLAGS=-Werror CFLAGS=-Werror
@@ -122,10 +122,10 @@ jobs:
       - name: Symlink lib for arduino-cli sketch resolution
         run: |
           mkdir -p ~/Arduino/libraries
-          ln -s "$GITHUB_WORKSPACE" ~/Arduino/libraries/midi2_cpp
+          ln -s "$GITHUB_WORKSPACE" ~/Arduino/libraries/midi2cpp
 
       - name: Install midi2 dependency from Library Manager
-        # midi2_cpp depends on midi2 (>=0.3.3) but arduino-cli does not
+        # midi2cpp depends on midi2 (>=0.3.3) but arduino-cli does not
         # walk depends= entries automatically. Install it explicitly.
         # Falls back to the GitHub git URL if the registry index has
         # not propagated yet (Library Manager indexes within 24h of a

CHANGELOG.md

@@ -1,13 +1,13 @@
 # Changelog
 
-All notable changes to `midi2_cpp` are recorded here. Format follows
+All notable changes to `midi2cpp` are recorded here. Format follows
 [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and this project
 adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html),
 mirrored from the upstream midi2 C99 policy.
 
 ## [0.2.0]
 
-Single source of truth for the MIDI 2.0 stack: midi2_cpp no longer
+Single source of truth for the MIDI 2.0 stack: midi2cpp no longer
 vendors the C99 core and is published as a regular Arduino /
 PlatformIO library that depends on midi2 explicitly. Every recipe
 under `examples/` was migrated to pull midi2 externally through the
@@ -16,23 +16,23 @@ native CMake, IDF Component Manager for ESP-IDF, lib_deps for
 PlatformIO).
 
 This is a breaking release. Consumers that previously vendored
-`midi2_cpp/src/midi2.{h,c}` directly will break; the migration path
+`midi2cpp/src/midi2.{h,c}` directly will break; the migration path
 is documented in the manifest below and in the per-build-system
 patterns shipped under `examples/`.
 
 ### Breaking
 
-- **Vendored `src/midi2.{h,c}` removed.** midi2_cpp now declares
+- **Vendored `src/midi2.{h,c}` removed.** midi2cpp now declares
   midi2 as an external dependency:
   - `library.properties` carries `depends=midi2 (>=0.3.3)`. Arduino
     Library Manager auto-installs midi2 when a sketch includes
-    midi2_cpp.
+    midi2cpp.
   - `library.json` carries `dependencies."sauloverissimo/midi2":
     "^0.3.3"`. PlatformIO resolves midi2 from its registry.
   - The root `CMakeLists.txt` exposes a three-layer fallback at the
     top (`if(NOT TARGET midi2)` -> `find_package(midi2 0.3.3 CONFIG)`
     -> `FetchContent_Declare(midi2 GIT_TAG v0.3.3)`), then links
-    midi2_cpp `PUBLIC midi2::midi2` so downstream targets see the
+    midi2cpp `PUBLIC midi2::midi2` so downstream targets see the
     C99 core transitively.
 
 ### Added
@@ -56,23 +56,23 @@ patterns shipped under `examples/`.
 - **CMake entry surface for downstream consumers**: the root
   `CMakeLists.txt` follows the same `find_package` -> `FetchContent`
   fallback pattern that midi2 itself ships. Subprojects pulling
-  midi2_cpp via `add_subdirectory` or `FetchContent` skip the
+  midi2cpp via `add_subdirectory` or `FetchContent` skip the
   `find_package` step (`if(NOT TARGET midi2)` guard).
 
 ### Changed
 
-- **README tagline** drops the `zero-allocation` claim. midi2_cpp
+- **README tagline** drops the `zero-allocation` claim. midi2cpp
   allocates in two narrow places (`m2bridge::begin()` slot tables and
   `std::function` callback storage), so the wrapper is now described
   as `static-by-default`. The C99 core (midi2) remains strictly
   zero-allocation. Same shift applied to the logo and to the
   `.intern/decisoes.md` design heritage notes.
 - **README "Manual vendor" path** rewritten: pre-v0.2 builds vendored
-  a single `midi2_cpp/src/midi2.{h,c}` copy; today the consumer
+  a single `midi2cpp/src/midi2.{h,c}` copy; today the consumer
   downloads both repositories side by side and adds `midi2/dist/`
-  plus `midi2_cpp/src/` to its include path.
+  plus `midi2cpp/src/` to its include path.
 - **`paragraph` in `library.properties`** rewritten: drops
-  comparisons with other libraries, focuses on what midi2_cpp itself
+  comparisons with other libraries, focuses on what midi2cpp itself
   ships and the embedded targets validated.
 
 ### Examples / Recipes
@@ -81,16 +81,16 @@ patterns shipped under `examples/`.
 
 | Build system | Mechanism | Recipes |
 |---|---|---|
-| Pico SDK | `FetchContent_Declare(midi2 GIT_TAG v0.3.3)` plus `target_link_libraries(midi2_cpp PUBLIC midi2::midi2)` | `rp2040-midi2`, `waveshare-rp2040-midi2`, `sparkfun-promicro-rp2350-midi2`, `waveshare-rp2350-usb-a-midi2`, `waveshare-rp2350-usb-a-bridge-midi2`, `adafruit-feather-rp2040-host-midi2`, `adafruit-feather-rp2040-bridge-midi2`, `rp2040-promicro-ump-test-bench` |
+| Pico SDK | `FetchContent_Declare(midi2 GIT_TAG v0.3.3)` plus `target_link_libraries(midi2cpp PUBLIC midi2::midi2)` | `rp2040-midi2`, `waveshare-rp2040-midi2`, `sparkfun-promicro-rp2350-midi2`, `waveshare-rp2350-usb-a-midi2`, `waveshare-rp2350-usb-a-bridge-midi2`, `adafruit-feather-rp2040-host-midi2`, `adafruit-feather-rp2040-bridge-midi2`, `rp2040-promicro-ump-test-bench` |
 | TinyUSB native CMake | same FetchContent pattern as Pico SDK | `xiao-samd21-midi2`, `nrf52840-promicro-midi2` |
 | ESP-IDF | `idf_component.yml` declares `midi2: { git: ..., version: ">=0.3.3" }` and `idf_component_register` lists `midi2` in `REQUIRES` | `arduino-nano-esp32-midi2`, `esp32-s3-devkitc-usb-midi2`, `esp32-p4-devkit-usb-midi2`, `esp32-p4-devkit-host-midi2`, `esp32-p4-devkit-bridge-midi2`, `esp32-p4-devkit-bridge2-midi2`, `t-display-s3-midi2` |
 | PlatformIO + ESP32_Host_MIDI | `lib_deps += sauloverissimo/midi2 @ ^0.3.3` | `esp32-c6-devkitc-multi-midi2`, `esp32-s3-devkitc-host-midi2`, `t-display-s3-shield-host-midi2` |
 
-Each recipe drops the `${MIDI2_CPP_ROOT}/src/midi2.c` (or `midi2_c99`
-helper library) from its source list. Other midi2_cpp sources
+Each recipe drops the `${MIDI2CPP_ROOT}/src/midi2.c` (or `midi2_c99`
+helper library) from its source list. Other midi2cpp sources
 (`midi2_device.cpp`, `midi2_ci.cpp`, `midi2_host.cpp`,
 `midi2_bridge.cpp`) keep being compiled inline from the parent tree
-via `${MIDI2_CPP_ROOT}/src` until the host helper-library shape is
+via `${MIDI2CPP_ROOT}/src` until the host helper-library shape is
 finalised in a future cycle.
 
 #### New recipes since v0.1.0
@@ -178,16 +178,16 @@ library (vendored stb-style at `src/midi2.{h,c}` from v0.3.0+).
 - Profile (M2-101 §7): `addProfile`, `removeProfile`, callbacks for
   `onProfileInquiry`, `onProfileEnable`, `onProfileDisable`,
   `onProfileAdded`, `onProfileRemoved`, `onProfileDetailsInquiry`,
-  `onProfileSpecificData`. Storage tunable via `MIDI2_CPP_MAX_PROFILES`
+  `onProfileSpecificData`. Storage tunable via `MIDI2CPP_MAX_PROFILES`
   (default 8).
 - Property Exchange (M2-101 §8, M2-103, M2-105):
   - Registry: `addProperty(name, getter, setter=nullptr)` (read-only by
     default), `addPropertyStatic(name, value)`, `removeProperty`.
-    Storage tunable via `MIDI2_CPP_MAX_PROPERTIES` (default 8).
+    Storage tunable via `MIDI2CPP_MAX_PROPERTIES` (default 8).
   - Subscribe / Notify state machine:
     `setPropertySubscribable(name, true)`, `notifyPropertyChanged(name)`
     for fan-out, `subscriberCount()`. Subscriber registry tunable via
-    `MIDI2_CPP_MAX_SUBSCRIBERS` (default 4).
+    `MIDI2CPP_MAX_SUBSCRIBERS` (default 4).
   - PE callbacks deliver raw bytes (header + body) instead of
     NUL-terminated strings, to avoid silent truncation of large JSON
     payloads.
@@ -196,7 +196,7 @@ library (vendored stb-style at `src/midi2.{h,c}` from v0.3.0+).
 
 ### `midi2::Host` — USB MIDI 2.0 host shape
 
-- Reactive multi-device host (`MIDI2_CPP_HOST_MAX_DEVICES`, default 4).
+- Reactive multi-device host (`MIDI2CPP_HOST_MAX_DEVICES`, default 4).
   Caller wires `tuh_midi2_*` (or platform-equivalent) into
   `notifyDeviceMounted/Unmounted`, `feedRx(idx, words, count)` and
   `setWriteFn(idx, words, count)`.
@@ -261,14 +261,14 @@ library (vendored stb-style at `src/midi2.{h,c}` from v0.3.0+).
   platform-conditional RNG `#if` chain from `midi2_ci.cpp`. The library
   no longer pulls `<Arduino.h>`, `pico/time.h`, `esp_timer.h`, or any
   USB stack header.
-- Removed the `MIDI2_CPP_TEST_MODE` build option. Tests now consume the
+- Removed the `MIDI2CPP_TEST_MODE` build option. Tests now consume the
   same public hooks platforms wire. One contract, one code path.
 - `Device::begin()` no longer claims to call `tusb_init` internally. It
   initialises the library's own dispatcher and returns; the caller owns
   the platform USB stack lifecycle.
 - `Device::task()` drops the commented `tud_task` stubs.
 - C++17 floor enforced via `static_assert(__cplusplus >= 201703L)` in
-  `midi2_cpp.h`.
+  `midi2cpp.h`.
 - `lib/tinyusb` git submodule and the `.gitmodules` entry removed. The
   library has zero external dependencies: midi2 C99 stays vendored,
   every USB stack and clock and RNG source is caller-wired. `git clone`

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.14)
-project(midi2_cpp VERSION 0.2.0 LANGUAGES C CXX)
+project(midi2cpp VERSION 0.2.0 LANGUAGES C CXX)
 
 set(CMAKE_C_STANDARD 99)
 set(CMAKE_C_STANDARD_REQUIRED ON)
@@ -11,7 +11,7 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 # Three-layer fallback: parent project's target -> system install
 # (vcpkg / conan / system package) -> FetchContent from GitHub.
 # This is the same pattern the midi2 README documents for downstream
-# consumers, applied to midi2_cpp itself.
+# consumers, applied to midi2cpp itself.
 if(NOT TARGET midi2)
     find_package(midi2 0.3.3 QUIET CONFIG)
     if(NOT midi2_FOUND)
@@ -26,44 +26,44 @@ endif()
 
 # Library target.
 #
-# midi2_cpp ships the C++ wrapper sources only; the C99 core lives in
+# midi2cpp ships the C++ wrapper sources only; the C99 core lives in
 # the external midi2 target this CMakeLists pulls above. Consumers
-# linking midi2_cpp transitively see midi2::midi2 because of the
+# linking midi2cpp transitively see midi2::midi2 because of the
 # PUBLIC link below.
-add_library(midi2_cpp
+add_library(midi2cpp
     src/midi2_device.cpp
     src/midi2_ci.cpp
     src/midi2_host.cpp
     src/midi2_bridge.cpp
 )
 
-target_link_libraries(midi2_cpp PUBLIC midi2::midi2)
+target_link_libraries(midi2cpp PUBLIC midi2::midi2)
 
-target_include_directories(midi2_cpp
+target_include_directories(midi2cpp
     PUBLIC
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
         $<INSTALL_INTERFACE:include>
 )
 
 # Warnings
 if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
-    target_compile_options(midi2_cpp PRIVATE
+    target_compile_options(midi2cpp PRIVATE
         -Wall -Wextra -Wpedantic
         -Wno-unused-parameter   # spec uses many unused params in stubs
     )
 endif()
 
-# Exportable alias for consumers: midi2_cpp::midi2_cpp
-add_library(midi2_cpp::midi2_cpp ALIAS midi2_cpp)
+# Exportable alias for consumers: midi2cpp::midi2cpp
+add_library(midi2cpp::midi2cpp ALIAS midi2cpp)
 
 # Tests: build only if this is the top-level project or tests explicitly requested
 if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
-    set(MIDI2_CPP_BUILD_TESTS_DEFAULT ON)
+    set(MIDI2CPP_BUILD_TESTS_DEFAULT ON)
 else()
-    set(MIDI2_CPP_BUILD_TESTS_DEFAULT OFF)
+    set(MIDI2CPP_BUILD_TESTS_DEFAULT OFF)
 endif()
-option(MIDI2_CPP_BUILD_TESTS "Build host-side unit tests" ${MIDI2_CPP_BUILD_TESTS_DEFAULT})
-if(MIDI2_CPP_BUILD_TESTS AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/tests/CMakeLists.txt")
+option(MIDI2CPP_BUILD_TESTS "Build host-side unit tests" ${MIDI2CPP_BUILD_TESTS_DEFAULT})
+if(MIDI2CPP_BUILD_TESTS AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/tests/CMakeLists.txt")
     # Tests use the same public hooks the platforms wire (setWriteFn,
     # setNowFn, feedRx). No special test mode — the contract is the contract.
     enable_testing()