Project Names

The name you give a project becomes a directory, a Python package, and a distribution name. Those three have different rules, and the strictest wins.

The rules

A valid project name:

• starts with a letter;
• contains only letters, digits, ., - and _;
• is 100 characters or fewer;
• converts to a valid, non-keyword Python identifier.

sillo-start create-app myapp          # ✓
sillo-start create-app my-cool-app    # ✓
sillo-start create-app my_app         # ✓
sillo-start create-app blog2          # ✓

sillo-start create-app 2blog          # ✗ does not start with a letter
sillo-start create-app "my app"       # ✗ contains a space
sillo-start create-app class          # ✗ a Python keyword

A rejection names the rule rather than just refusing:

✗ '2blog' is not a valid project name.
  Use a letter followed by letters, digits, hyphens or underscores.

This is checked before anything is fetched. A name that cannot work should cost you nothing.

Dashes are fine

Dashes are permitted because that is the convention for distribution names on PyPI. They are converted where a dash is not legal:

Project name	my-cool-app
Package name	my_cool_app
Distribution name	my-cool-app

So my-cool-app is what you type, my_cool_app is what you import, and both are what you would have chosen by hand.

The identifier check is applied to the converted form. That is what makes the rule precise rather than approximate: a name is valid when the package name it produces is a legal, non-keyword identifier.

The shapes derived from a name

Generators and templates need the same name in several forms at once. Sillo Start derives them all from one input, so they cannot drift apart:

Function	BlogPost becomes	blog_post becomes
to_snake	blog_post	blog_post
to_pascal	BlogPost	BlogPost
to_camel	blogPost	blogPost
to_kebab	blog-post	blog-post
to_title	Blog Post	Blog Post
to_human	Blog post	Blog post
table_name	blog_posts	blog_posts

The splitter handles camelCase, PascalCase, snake_case, kebab-case and space-separated text, including acronym runs. APIKey splits to ["api", "key"] rather than ["a", "p", "i", "key"].

Pluralisation

table_name pluralises the last word only, so BlogPost becomes blog_posts rather than blogs_posts.

The rules are deliberately a small set rather than a dependency:

• irregulars: person/people, child/children, man/men, woman/women, tooth/teeth, foot/feet, mouse/mice, goose/geese;
• uncountables left alone: equipment, information, money, series, species, data;
• ending s, x, z, ch or sh takes es;
• consonant followed by y becomes ies;
• f and fe become ves;
• otherwise s.

That covers the shapes model names actually take. Anything it gets wrong you can override on the model:

class Meta:
    table = "people_records"

Which is the right escape hatch. An inflection library would be a dependency carried by every project to be right about a handful of nouns.

Using them yourself

They are importable, and they are plain functions:

from sillo_start.utils.naming import (
    to_snake, to_pascal, to_camel, to_kebab, to_title, to_human,
    pluralize, table_name,
    is_valid_project_name, is_valid_python_identifier,
    package_name_for, distribution_name_for, ensure_suffix,
)

ensure_suffix is the one worth knowing about. It appends a suffix unless it is already there, case-insensitively:

ensure_suffix("User", "Controller")            # UserController
ensure_suffix("UserController", "Controller")  # UserController

So a generator can accept User or UserController and produce the same thing either way.