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Copier templating — author copier.yml templates (questions, Jinja, _tasks, migrations), scaffold via `copier copy`, sync via `copier update`. Use for copier.yml, .copier-answers.yml, or .jinja.
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| name | copier |
| description | Copier templating — author copier.yml templates (questions, Jinja, _tasks, migrations), scaffold via `copier copy`, sync via `copier update`. Use for copier.yml, .copier-answers.yml, or .jinja. |
Copier renders project templates from Git repos and keeps generated projects in sync as the
template evolves. Templates are plain directories: a copier.yml config plus source files, where
.jinja-suffixed files (and {{ var }} in names) are rendered through Jinja2.
copier.yml questions + a template tree → references/copier-yml.md, references/templating.mdcopier copy <src> <dst> → references/cli-api.mdcopier update (three-way merge) → references/update-migrations.mdcopier.run_copy/run_update, --trust, --defaults → references/cli-api.mdpipx install copier # isolated CLI (recommended)
uv tool install copier # or via uv
copier --version
| Command | Purpose |
|---|---|
copier copy <src> <dst> | Scaffold a new project from a template |
copier update | Sync project to latest template version (run inside project) |
copier recopy | Re-apply template fresh, keeping answers (no smart diff) |
copier check-update | Report whether a newer template version exists |
Common flags: -r/--vcs-ref <tag|branch|HEAD>, -d/--data key=value, --defaults,
--pretend (dry run), --overwrite/-f, --exclude <pat>, --skip <q>, --trust,
--conflict inline|rej, -A/--skip-answered. Full list: references/cli-api.md.
Template sources: local path, gh:ns/repo, gl:ns/repo, git+https://…, git@…, *.git.
my-template/
├── copier.yml
├── {{ project_name }}/ # folder name is templated
│ └── README.md.jinja # rendered (suffix stripped)
└── {{ _copier_conf.answers_file }}.jinja # records answers for updates
# copier.yml
project_name:
type: str
help: Your project name
use_ci:
type: bool
default: true
_subdirectory: "." # render from repo root (use a subdir to keep meta files out)
_min_copier_version: "9.0.0"
{# {{ _copier_conf.answers_file }}.jinja — NEVER hand-edit the generated file #}
# Changes here will be overwritten by Copier; manual edits break `copier update`.
{{ _copier_answers|to_nice_yaml -}}
The answers file (.copier-answers.yml, committed) is what makes copier update work — it stores
_src_path, _commit, and every saved answer. Without it, updates are impossible.
.jinja (configurable via _templates_suffix). Names support {{ var }}.copier.yml; underscore-prefixed keys (_tasks, _exclude,
_migrations, _subdirectory, …) are settings, not questions. See references/copier-yml.md.git tag v1.0.0). copier update picks the latest PEP 440 tag._tasks or extra _jinja_extensions need --trust to run.copier update requires a clean git working tree in both template (tagged) and project..copier-answers.yml by hand — it breaks the diff algorithm.default: "{{ x }}") so the YAML parser doesn't choke.default/when can only reference questions declared above it..rej files after updates.references/copier-yml.md — question types, choices, when, validators, all _settings keysreferences/templating.md — Jinja rendering, file/folder naming, _exclude, _tasks, context varsreferences/update-migrations.md — update algorithm, conflicts, _migrations, recopyreferences/cli-api.md — full CLI flag reference, Python API, CI patternsReviews code comments across languages before a PR opens. Use when finishing a development branch, before merging, or when a pr create was blocked pending comment review.
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