README.md

Notes can be found here.

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Running

bazel --version   # bazel 7.0.1

C++ Project

cd cpp-project
bazel run //greeting:helloworld

Java Project

cd java-project
bazel run //:ProjectRunner
bazel run //:salutations
bazel run //:restclient

Queries:

cd java-project
bazel run //:runner
bazel query //src/main/java/com/query/dishes/...
bazel query --noimplicit_deps "deps(:runner)"
bazel query "rdeps(//... , //src/main/java/com/query/ingredients:salt)"
bazel query 'attr(tags, "hcp", //src/main/java/com/query/customers/...)'

Python3 Project

cd py-project/app
bazel run //app:main

Rules

Gen Rules

cd rules/gen-rules
bazel build //:concat         # See output (target) in bazel-bin/concat.txt
bazel  build //:process_data  # See output (target) in bazel-bin/output.txt
bazel  build //:copy_files    # See output (target) in bazel-bin/copy_file.txt
bazel build //:cat_files      # See output (target) in bazel-bin/cat_files.txt

Custom Rules
name in BUILD is the target

cd rules/custom-rules
bazel build //:bin1                # See output (target) in bazel-bin/bin1
bazel build //:bin2                # See output (target) in bazel-bin/bin2
bazel build //:bin                 # See output (target) in bazel-bin/bin
bazel run //:say_hello_to_gaurav   # This is equivalent to bazel build //:hello-gaurav; bazel run //:say_hello_to_gaurav

Macros

cd macros
bazel build //:hello_world_code_dive    # See output in bazel-bin/hello_world_code_dive
bazel build //:hello_world_everyone     # See output in bazel-bin/hello_world_everyone

Visualize dependencies

bazel query  --notool_deps --noimplicit_deps "deps(//:*)" --output graph

Sample here

Some Advanced Concepts

Queries

cd rules/gen-rules
bazel aquery 'deps(//:concat)'   # action query
bazel cquery 'deps(//:concat)'   # configurable query

Toolchain

cd pythontoolchain
bazel run //:bin       # It should print 3.10 (version mentioned in WORKSPACE) but in latest bazel version, it takes system version like 3.12.2 but you will see 3.10 version is being downloaded

Links

• Hermetic Python Toolchain with Bazel.
• Writing custom Bazel C++ rules
• Writing Bazel rules: library rule, depsets, providers
• User-defined build settings for Bazel builds

For debugging,

• Run Configurations IJ
• Bazel VS Marketplace