setup autocomplete for c++

Author: charliesbot

.gitignore

@@ -39,3 +39,4 @@
 bazel-*
 
 node_modules
+compile_commands.json

README.md

@@ -6,3 +6,6 @@ Leetcode exercises
 
 ### Run C++ Tests
 `bazel test --test_output=all //cpp:tests`
+
+### Generate Compilation Database (for better autocomplete)
+`./generate_compilation_db.sh`

WORKSPACE

@@ -25,6 +25,12 @@ http_archive(
   strip_prefix = "rules_cc-40548a2974f1aea06215272d9c2b47a14a24e556",
 )
 
+http_archive(
+    name = "com_grail_bazel_compdb",
+    strip_prefix = "bazel-compilation-database-master",
+    urls = ["https://github.com/grailbio/bazel-compilation-database/archive/master.tar.gz"],
+)
+
 # Fetch rules_nodejs so we can install our npm dependencies
 http_archive(
     name = "build_bazel_rules_nodejs",

cpp/BUILD

@@ -1,5 +1,6 @@
 package(default_visibility = ["//visibility:public"])
 load("@rules_cc//cc:defs.bzl", "cc_test")
+load("@com_grail_bazel_compdb//:aspects.bzl", "compilation_database")
 
 cc_library(
     name="exercises",
@@ -14,8 +15,17 @@ cc_library(
 cc_test(
   name = "tests",
   srcs = glob(["**/**/*_test.cc"]),
+  testonly = False,
   deps = [
       ":exercises",
       "@com_google_googletest//:gtest_main"
       ],
 )
+
+compilation_database(
+    name = "compilation_db",
+    targets = [
+        ":exercises",
+        ":tests"
+    ],
+)

generate_compilation_db.sh

@@ -0,0 +1,15 @@
+# Command to generate the compilation database file.
+bazel build cpp:compilation_db
+
+# Location of the compilation database file.
+outfile="$(bazel info bazel-bin)/cpp/compile_commands.json"
+
+# Command to replace the marker for exec_root in the file.
+execroot=$(bazel info execution_root)
+sed -i.bak "s@__EXEC_ROOT__@${execroot}@" "${outfile}"
+
+# The compilation database is now ready to use at this location.
+echo "Compilation Database: ${outfile}"
+
+workspace="$(bazel info workspace)"
+ln -s "${outfile}" "${workspace}"