From 84ece495c6a179a9104eada4b72d00925afddd3b Mon Sep 17 00:00:00 2001
From: Yuki Kishimoto <yukikishimoto@protonmail.com>
Date: Mon, 4 Nov 2024 12:09:02 +0100
Subject: [PATCH] c: use `CMakeLists.txt`

Signed-off-by: Yuki Kishimoto <yukikishimoto@protonmail.com>
---
 bindings/nostr-sdk-c/CMakeLists.txt          | 38 ++++++++++++++++++++
 bindings/nostr-sdk-c/Cargo.toml              |  2 +-
 bindings/nostr-sdk-c/README.md               | 30 ++++++++++++++++
 bindings/nostr-sdk-c/examples/CMakeLists.txt | 18 ++++++++++
 bindings/nostr-sdk-c/include/.gitkeep        |  0
 bindings/nostr-sdk-c/justfile                |  8 ++---
 6 files changed, 89 insertions(+), 7 deletions(-)
 create mode 100644 bindings/nostr-sdk-c/CMakeLists.txt
 create mode 100644 bindings/nostr-sdk-c/examples/CMakeLists.txt
 delete mode 100644 bindings/nostr-sdk-c/include/.gitkeep

diff --git a/bindings/nostr-sdk-c/CMakeLists.txt b/bindings/nostr-sdk-c/CMakeLists.txt
new file mode 100644
index 000000000..07cab87b2
--- /dev/null
+++ b/bindings/nostr-sdk-c/CMakeLists.txt
@@ -0,0 +1,38 @@
+# Minimum CMake version required
+cmake_minimum_required(VERSION 3.10)
+
+# Project Name
+project(NostrSDK)
+
+# Add your Rust library as a CMake target
+add_custom_target(nostr_sdk ALL
+ COMMAND cargo build --release
+ WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+# Determine the library file extension based on the platform
+if(WIN32)
+  set(LIBRARY_FILE "nostr_sdk_c.dll")
+elseif(APPLE)
+  set(LIBRARY_FILE "libnostr_sdk_c.dylib")
+else()
+  set(LIBRARY_FILE "libnostr_sdk_c.so")
+endif()
+
+# Path to the generated header and library
+set(HEADER_PATH "${CMAKE_CURRENT_SOURCE_DIR}/include")
+set(LIB_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../../target/release")
+
+# Export the library's include directory
+include_directories(${HEADER_PATH})
+link_directories(${LIB_PATH})
+
+add_library(nostr_sdk_interface INTERFACE)
+target_include_directories(nostr_sdk_interface INTERFACE ${HEADER_PATH})
+target_link_libraries(nostr_sdk_interface INTERFACE ${LIB_PATH}/${LIBRARY_FILE})
+
+# Install header files
+install(FILES ${HEADER_PATH}/nostr_sdk.h DESTINATION include)
+
+# Install the shared library
+install(FILES ${LIB_PATH}/${LIBRARY_FILE} DESTINATION lib)
diff --git a/bindings/nostr-sdk-c/Cargo.toml b/bindings/nostr-sdk-c/Cargo.toml
index ace244eb2..456e0a998 100644
--- a/bindings/nostr-sdk-c/Cargo.toml
+++ b/bindings/nostr-sdk-c/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2021"
 publish = false
 
 [lib]
-crate-type = ["staticlib"]
+crate-type = ["cdylib", "staticlib"]
 
 [dependencies]
 nostr-sdk = { workspace = true, features = ["all-nips"] }
diff --git a/bindings/nostr-sdk-c/README.md b/bindings/nostr-sdk-c/README.md
index 5733aa151..2251bad9c 100644
--- a/bindings/nostr-sdk-c/README.md
+++ b/bindings/nostr-sdk-c/README.md
@@ -1,5 +1,35 @@
 # C/C++ bindings for Nostr SDK
 
+## Integration
+
+### Clone the repository
+
+```bash
+git clone https://github.com/rust-nostr/nostr.git
+cd nostr
+```
+
+### Configure your CMake
+
+```cmake
+# Add the external library project
+add_subdirectory(<path>/nostr/bindings/nostr-sdk-c nostr_sdk)
+include_directories("<path>/nostr/bindings/nostr-sdk-c/include")
+link_directories("<path>/nostr/target/release")
+
+# Link library to a binary
+target_link_libraries(<binary> PRIVATE nostr_sdk_interface)
+```
+
+### Build your project
+
+```bash
+mkdir build
+cd build
+cmake ..
+make
+```
+
 ## Supported NIPs
 
 Look at <https://github.com/rust-nostr/nostr/tree/master/crates/nostr#supported-nips>
diff --git a/bindings/nostr-sdk-c/examples/CMakeLists.txt b/bindings/nostr-sdk-c/examples/CMakeLists.txt
new file mode 100644
index 000000000..0c88b75db
--- /dev/null
+++ b/bindings/nostr-sdk-c/examples/CMakeLists.txt
@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 3.10)
+
+# Project name
+project(Examples)
+
+# Add the library
+add_subdirectory(../ nostr_sdk)
+include_directories("../include")
+link_directories("../../../target/release")
+
+# Define the C binaries
+add_executable(keys keys.c)
+add_dependencies(keys nostr_sdk)
+target_link_libraries(keys PRIVATE nostr_sdk_interface)
+
+add_executable(client client.c)
+add_dependencies(client nostr_sdk)
+target_link_libraries(client PRIVATE nostr_sdk_interface)
diff --git a/bindings/nostr-sdk-c/include/.gitkeep b/bindings/nostr-sdk-c/include/.gitkeep
deleted file mode 100644
index e69de29bb..000000000
diff --git a/bindings/nostr-sdk-c/justfile b/bindings/nostr-sdk-c/justfile
index cd6df6925..9e51ce4d2 100755
--- a/bindings/nostr-sdk-c/justfile
+++ b/bindings/nostr-sdk-c/justfile
@@ -1,10 +1,6 @@
 #!/usr/bin/env just --justfile
 
-build:
-    cargo build --release
+examples:
+    cd examples && mkdir -p build && cd build && cmake .. && make
 
-examples: build
-    mkdir -p bin/
-    gcc examples/keys.c -o bin/keys -I include/ -L ../../target/release/ -lnostr_sdk_c -lpthread -ldl -lm -lrt
-    gcc examples/client.c -o bin/client -I include/ -L ../../target/release/ -lnostr_sdk_c -lpthread -ldl -lm -lrt