Feature: forlayer block that applies a set of command on each layer
#392
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abey79
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Feb 21, 2022
This PR introduces expression substitution on most user input. Expressions are marked with `%` characters and are a subset of the Python language. They are interpreted using the `asteval` package (see [doc](https://newville.github.io/asteval/)). See doc for the built-in symbols. New commands: - `forfile` - `forlayer` - `eval` Misc other changes: - The `read` command now will not fail if the provided file doesn't exist and the `--no-fail` parameter is used - `grid` now sets page size - `read` now sets/update the `vp_source`/`vp_sources` system props - added `--no-fail` to read - added explicit support for `vp_sources` update in `vp.Document` - Fixed pycharm type error with CliRunner.execute() - Added reference SVG tests - Major doc update - Minor update to docstrings - pined shapely to 1.8.0 due to installer breaking with the current 1.8.1 (missing geos lib) - Updated deps Fixes #392 Fixes #381
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Example:
vpype read multilayer.svg begin forlayer write "output$lid$.svg" endRequires expression substitution to be useful. Would fix #381.
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