use src rather than srcs when only one requirements file is needed

Author: cj81499

docs/sphinx/BUILD.bazel

@@ -130,7 +130,7 @@ sphinx_build_binary(
 # Run bazel run //docs/sphinx:requirements.update
 compile_pip_requirements(
     name = "requirements",
-    srcs = ["pyproject.toml"],
+    src = "pyproject.toml",
     requirements_txt = "requirements.txt",
     target_compatible_with = _TARGET_COMPATIBLE_WITH,
 )

examples/build_file_generation/BUILD.bazel

@@ -11,7 +11,7 @@ load("@rules_python_gazelle_plugin//modules_mapping:def.bzl", "modules_mapping")
 
 compile_pip_requirements(
     name = "requirements",
-    srcs = ["requirements.in"],
+    src = "requirements.in",
     requirements_txt = "requirements_lock.txt",
     requirements_windows = "requirements_windows.txt",
 )

examples/bzlmod/BUILD.bazel

@@ -16,7 +16,7 @@ load("@rules_python//python:defs.bzl", "py_binary", "py_library", "py_test")
 # with pip-compile.
 compile_pip_requirements_3_9(
     name = "requirements_3_9",
-    srcs = ["requirements.in"],
+    src = "requirements.in",
     requirements_txt = "requirements_lock_3_9.txt",
     requirements_windows = "requirements_windows_3_9.txt",
 )
@@ -26,7 +26,7 @@ compile_pip_requirements_3_9(
 compile_pip_requirements_3_10(
     name = "requirements_3_10",
     timeout = "moderate",
-    srcs = ["requirements.in"],
+    src = "requirements.in",
     requirements_txt = "requirements_lock_3_10.txt",
     requirements_windows = "requirements_windows_3_10.txt",
 )

examples/bzlmod/other_module/BUILD.bazel

@@ -4,6 +4,6 @@ load("@python_versions//3.11:defs.bzl", compile_pip_requirements_311 = "compile_
 # override in the MODULE.bazel.
 compile_pip_requirements_311(
     name = "requirements",
-    srcs = ["requirements.in"],
+    src = "requirements.in",
     requirements_txt = "requirements_lock_3_11.txt",
 )

examples/bzlmod_build_file_generation/BUILD.bazel

@@ -16,7 +16,7 @@ load("@rules_python_gazelle_plugin//modules_mapping:def.bzl", "modules_mapping")
 # with pip-compile.
 compile_pip_requirements(
     name = "requirements",
-    srcs = ["requirements.in"],
+    src = "requirements.in",
     requirements_txt = "requirements_lock.txt",
     requirements_windows = "requirements_windows.txt",
 )

examples/multi_python_versions/requirements/BUILD.bazel

@@ -5,24 +5,24 @@ load("@python//3.9:defs.bzl", compile_pip_requirements_3_9 = "compile_pip_requir
 
 compile_pip_requirements_3_8(
     name = "requirements_3_8",
-    srcs = ["requirements.in"],
+    src = "requirements.in",
     requirements_txt = "requirements_lock_3_8.txt",
 )
 
 compile_pip_requirements_3_9(
     name = "requirements_3_9",
-    srcs = ["requirements.in"],
+    src = "requirements.in",
     requirements_txt = "requirements_lock_3_9.txt",
 )
 
 compile_pip_requirements_3_10(
     name = "requirements_3_10",
-    srcs = ["requirements.in"],
+    src = "requirements.in",
     requirements_txt = "requirements_lock_3_10.txt",
 )
 
 compile_pip_requirements_3_11(
     name = "requirements_3_11",
-    srcs = ["requirements.in"],
+    src = "requirements.in",
     requirements_txt = "requirements_lock_3_11.txt",
 )

examples/pip_parse/BUILD.bazel

@@ -55,7 +55,7 @@ py_console_script_binary(
 # This rule adds a convenient way to update the requirements file.
 compile_pip_requirements(
     name = "requirements",
-    srcs = ["requirements.in"],
+    src = "requirements.in",
     requirements_txt = "requirements_lock.txt",
     requirements_windows = "requirements_windows.txt",
 )

examples/pip_parse_vendored/BUILD.bazel

@@ -9,7 +9,7 @@ load("//:requirements.bzl", "all_data_requirements", "all_requirements", "all_wh
 # lockfile based on the requirements.in.
 compile_pip_requirements(
     name = "requirements",
-    srcs = ["requirements.in"],
+    src = "requirements.in",
 )
 
 # The requirements.bzl file is using the hub repo to access packages via the

examples/pip_repository_annotations/BUILD.bazel

@@ -9,7 +9,7 @@ exports_files(
 # This rule adds a convenient way to update the requirements file.
 compile_pip_requirements(
     name = "requirements",
-    srcs = ["requirements.in"],
+    src = "requirements.in",
 )
 
 py_test(

examples/wheel/BUILD.bazel

@@ -280,25 +280,25 @@ py_wheel(
 write_file(
     name = "requires_file",
     out = "requires.txt",
-    content = """\
-# Requirements file
---index-url https://pypi.com
-
-tomli>=2.0.0
-starlark  # Example comment
+    content = """\\\r
+# Requirements file\r
+--index-url https://pypi.com\r
+\r
+tomli>=2.0.0\r
+starlark  # Example comment\r
 """.splitlines(),
 )
 
 write_file(
     name = "extra_requires_file",
     out = "extra_requires.txt",
-    content = """\
-# Extras Requirements file
---index-url https://pypi.com
-
-pyyaml>=6.0.0,!=6.0.1
-toml; (python_version == "3.11" or python_version == "3.12") and python_version != "3.8"
-wheel; python_version == "3.11" or python_version == "3.12"  # Example comment
+    content = """\\\r
+# Extras Requirements file\r
+--index-url https://pypi.com\r
+\r
+pyyaml>=6.0.0,!=6.0.1\r
+toml; (python_version == "3.11" or python_version == "3.12") and python_version != "3.8"\r
+wheel; python_version == "3.11" or python_version == "3.12"  # Example comment\r
 """.splitlines(),
 )
 
@@ -360,7 +360,7 @@ py_test(
 
 compile_pip_requirements(
     name = "requirements_server",
-    srcs = ["requirements_server.in"],
+    src = "requirements_server.in",
 )
 
 py_test(