add compile_commands support to simplify development

.gitignore

@@ -47,3 +47,13 @@ user.bazelrc
 compile_commands.json
 
 coverage_report
+
+### Automatically added by Hedron's Bazel Compile Commands Extractor: https://github.com/hedronvision/bazel-compile-commands-extractor
+# Ignore the `external` link (that is added by `bazel-compile-commands-extractor`). The link differs between macOS/Linux and Windows, so it shouldn't be checked in. The pattern must not end with a trailing `/` because it's a symlink on macOS/Linux.
+/external
+# Ignore links to Bazel's output. The pattern needs the `*` because people can change the name of the directory into which your repository is cloned (changing the `bazel-<workspace_name>` symlink), and must not end with a trailing `/` because it's a symlink on macOS/Linux.
+/bazel-*
+# Ignore generated output. Although valuable (after all, the primary purpose of `bazel-compile-commands-extractor` is to produce `compile_commands.json`!), it should not be checked in.
+/compile_commands.json
+# Ignore the directory in which `clangd` stores its local index.
+/.cache/

BUILD

@@ -0,0 +1,13 @@
+load("@hedron_compile_commands//:refresh_compile_commands.bzl", "refresh_compile_commands")
+
+refresh_compile_commands(
+    name = "refresh_compile_commands",
+
+    # Specify the targets of interest.
+    # For example, specify a dict of targets and any flags required to build.
+    targets = {
+        "//cpp2sky/...": "",
+        "//source/...": "",
+        "//test/...": "",
+    },
+)

README.md

@@ -31,7 +31,9 @@ cc_binary(
   ],
 )
 ```
+
 #### Cmake
+
 You can compile this project, according to the following steps:
 ```
 step 01: git clone git@github.com:SkyAPM/cpp2sky.git
@@ -41,7 +43,7 @@ step 04: cmake -S ./grpc -B ./grpc/build && cmake --build ./grpc/build --paralle
 step 05: cmake -S . -B ./build && cmake --build ./build
 ```
 
-You can also use find_package to get target libary in your project. Like this: 
+You can also use find_package to get target libary in your project. Like this:
 ```
 find_package(cpp2sky CONFIG REQUIRED)
 target_link_libraries(${PROJECT_NAME} cpp2sky::cpp2sky proto_lib)
@@ -52,9 +54,14 @@ find_package(PkgConfig REQUIRED)
 pkg_check_modules(CPP2SKY_PKG REQUIRED cpp2sky)
 ```
 
-Note: 
+Note:
 - If you want to build this project over c11, you must update grpc version(current version:v1.46.6).
 - Only test cmake using Centos and Ubuntu.
+
+#### Develop
+
+Generate `compile_commands.json` for this repo by `bazel run :refresh_compile_commands`. Thank https://github.com/hedronvision/bazel-compile-commands-extractor for it provide the great script/tool to make this so easy!
+
 #### Docs
 
 cpp2sky configration is based on protobuf, and docs are generated by [protodoc](https://github.com/etcd-io/protodoc). If you have any API change, you should run below.

WORKSPACE

@@ -17,3 +17,7 @@ grpc_deps()
 load("@com_github_grpc_grpc//bazel:grpc_extra_deps.bzl", "grpc_extra_deps")
 
 grpc_extra_deps()
+
+load("@hedron_compile_commands//:workspace_setup.bzl", "hedron_compile_commands_setup")
+
+hedron_compile_commands_setup()

bazel/repositories.bzl

@@ -10,6 +10,7 @@ def cpp2sky_dependencies():
     com_github_fmtlib_fmt()
     com_google_abseil()
     com_github_gabime_spdlog()
+    hedron_compile_commands()
 
 def skywalking_data_collect_protocol():
     http_archive(
@@ -89,3 +90,13 @@ def com_google_abseil():
         strip_prefix = "abseil-cpp-6f43f5bb398b6685575b36874e36cf1695734df1",
         urls = ["https://github.com/abseil/abseil-cpp/archive/6f43f5bb398b6685575b36874e36cf1695734df1.tar.gz"],
     )
+
+def hedron_compile_commands():
+    # Hedron's Compile Commands Extractor for Bazel
+    # https://github.com/hedronvision/bazel-compile-commands-extractor
+    http_archive(
+        name = "hedron_compile_commands",
+        url = "https://github.com/hedronvision/bazel-compile-commands-extractor/archive/dc36e462a2468bd79843fe5176542883b8ce4abe.tar.gz",
+        sha256 = "d63c1573eb1daa4580155a1f0445992878f4aa8c34eb165936b69504a8407662",
+        strip_prefix = "bazel-compile-commands-extractor-dc36e462a2468bd79843fe5176542883b8ce4abe",
+    )