python: handle dependencies in bazel

Signed-off-by: Øyvind Harboe <[email protected]>

BUILD

@@ -1,3 +1,5 @@
+load("@pip//:requirements.bzl", "requirement")
+load("@rules_python//python:pip.bzl", "compile_pip_requirements")
 load("//:eqy.bzl", "eqy_test")
 load("//:openroad.bzl", "get_stage_args", "orfs_floorplan", "orfs_flow", "orfs_run")
 load("//:sweep.bzl", "orfs_sweep")
@@ -350,3 +352,18 @@ orfs_run(
     },
     script = ":units.tcl",
 )
+
+compile_pip_requirements(
+    name = "requirements",
+    src = "requirements.in",
+    requirements_txt = "requirements_lock.txt",
+)
+
+py_binary(
+    name = "plot_repair",
+    main = "plot-retiming.py",
+    srcs = [
+        "plot-retiming.py",
+    ],
+    deps = [requirement("matplotlib")]
+)

MODULE.bazel

@@ -34,3 +34,19 @@ load_json_file(
     out = "variables.json",
     script = "//:yaml_to_json.py",
 )
+
+bazel_dep(name = "rules_python", version = "0.31.0")
+
+python = use_extension("@rules_python//python/extensions:python.bzl", "python")
+python.toolchain(
+    ignore_root_user_error = True,
+    python_version = "3.12",
+)
+
+pip = use_extension("@rules_python//python/extensions:pip.bzl", "pip")
+pip.parse(
+    hub_name = "pip",
+    python_version = "3.12",
+    requirements_lock = "//:requirements_lock.txt",
+)
+use_repo(pip, "pip")

requirements.in

@@ -0,0 +1 @@
+matplotlib==3.6.3