Parse settings from pyproject.toml: `TOMLLoader`

[hasansezertasan]

There are many tools in the python ecosystem adopting pyproject.toml files. I like to have static configuration when I can and I like to keep things clean and tidy. I am trying to do it with pyproject.toml. It would be very convenient to support pyproject.toml.

I don't have a great TOML design in my mind but I converted a YAML config from the tests and added tool.webassets prefix. Here are the results:

• test_load_bundles:

standard:
  filters: cssmin,jsmin
  output: output.css
  contents:
    - file1
    - file2
empty-bundle:
single-content-as-string-bundle:
  contents: only-this
nested:
  output: nested.css
  filters: cssmin
  contents:
    - cssfile1
    - filters: less
      contents:
        - lessfile1
        - lessfile2
        - contents: reallynested.css
          config:
            closure_bin: /tmp/closure
        - lessfile3

[tool.webassets.standard]
filters = "cssmin,jsmin"
output = "output.css"
contents = ["file1", "file2"]

[tool.webassets.single-content-as-string-bundle]
contents = "only-this"

[tool.webassets.nested]
output = "nested.css"
filters = "cssmin"
contents = [
  "cssfile1",
  { filters = "less", contents = [
    "lessfile1",
    "lessfile2",
    { contents = "reallynested.css", config = { closure_bin = "/tmp/closure" } },
    "lessfile3",
  ] },
]

---

• test_load_recursive_bundles

standard:
    filters: cssmin,jsmin
    output: output.css
    contents:
        - file1
        - file2
recursive:
    output: recursive.css
    filters: jsmin
    contents:
        - cssfile1
        - standard
        - cssfile2

[tool.webassets.standard]
filters = "cssmin,jsmin"
output = "output.css"
contents = [ "file1", "file2" ]

[tool.webassets.recursive]
output = "recursive.css"
filters = "jsmin"
contents = [ "cssfile1", "standard", "cssfile2" ]

---

• test_load_environment

url: /foo
directory: something
versions: 'timestamp'
auto_build: true
url_expire: true
config:
    compass_bin: /opt/compass

bundles:
    test:
        output: foo

[tool.webassets]
url = "/foo"
directory = "something"
versions = "timestamp"
auto_build = true
url_expire = true

[tool.webassets.config]
compass_bin = "/opt/compass"

[tool.webassets.bundles.test]
output = "foo"

---

• test_load_environment_directory_base

url: /foo
directory: ../something

[tool.webassets]
url = "/foo"
directory = "../something"

• test_load_extra_default

foo:
    output: foo

[tool.webassets.foo]
output = "foo"

We can use pydantic-settings to extract, parse and validate the configuration. Checkout the related documentation.