Enable IDE support in emacs.

Author: steve-the-bayesian

WORKSPACE

@@ -11,3 +11,36 @@ git_repository(
     remote = "https://github.com/google/googletest",
     shallow_since = "1631811621 -0400",
 )
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+#####
+# Hedron's tools are needed to enable some kinds of IDE support in emacs.
+
+# Hedron's Compile Commands Extractor for Bazel
+# https://github.com/hedronvision/bazel-compile-commands-extractor
+http_archive(
+    name = "hedron_compile_commands",
+
+    # Replace the commit hash (0e990032f3c5a866e72615cf67e5ce22186dcb97) in both places (below) with the latest (https://github.com/hedronvision/bazel-compile-commands-extractor/commits/main), rather than using the stale one here.
+    # Even better, set up Renovate and let it do the work for you (see "Suggestion: Updates" in the README).
+    url = "https://github.com/hedronvision/bazel-compile-commands-extractor/archive/a14ad3a64e7bf398ab48105aaa0348e032ac87f8.tar.gz",
+    strip_prefix = "bazel-compile-commands-extractor-a14ad3a64e7bf398ab48105aaa0348e032ac87f8",
+    # When you first run this tool, it'll recommend a sha256 hash to put here with a message like: "DEBUG: Rule 'hedron_compile_commands' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = ..."
+)
+
+load("@hedron_compile_commands//:workspace_setup.bzl", "hedron_compile_commands_setup")
+
+hedron_compile_commands_setup()
+
+load("@hedron_compile_commands//:workspace_setup_transitive.bzl", "hedron_compile_commands_setup_transitive")
+
+hedron_compile_commands_setup_transitive()
+
+load("@hedron_compile_commands//:workspace_setup_transitive_transitive.bzl", "hedron_compile_commands_setup_transitive_transitive")
+
+hedron_compile_commands_setup_transitive_transitive()
+
+load("@hedron_compile_commands//:workspace_setup_transitive_transitive_transitive.bzl", "hedron_compile_commands_setup_transitive_transitive_transitive")
+
+hedron_compile_commands_setup_transitive_transitive_transitive()