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Add notes about environment variables to readme (#1229)

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Casey Rodarmor 2022-06-13 18:28:22 -07:00 committed by GitHub
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README.md
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@ -25,7 +25,7 @@
This readme is also available as a [book](https://just.systems/man/en/); This readme is also available as a [book](https://just.systems/man/en/);
(中文文档在 [这里](README.中文.md), 快看过来!) (中文文档在 [这里](https://github.com/casey/just/blob/master/README.中文.md), 快看过来!)
Commands, called recipes, are stored in a file called `justfile` with syntax inspired by `make`: Commands, called recipes, are stored in a file called `justfile` with syntax inspired by `make`:
@ -1594,6 +1594,22 @@ foo:
echo $x echo $x
``` ```
### Sharing Environment Variables Between Recipes
Each line of each recipe is executed by a fresh shell, so it is not possible to share environment variables between recipes.
#### Using Python Virtual Environments
Some tools, like [Python's venv](https://docs.python.org/3/library/venv.html), require loading environment variables in order to work, making them challenging to use with `just`. As a workaround, you can execute the virtual environment binaries directly:
```make
venv:
[ -d foo ] || python3 -m venv foo
run: venv
./foo/bin/python3 main.py
```
### Changing the Working Directory in a Recipe ### Changing the Working Directory in a Recipe
Each recipe line is executed by a new shell, so if you change the working directory on one line, it won't have an effect on later lines: Each recipe line is executed by a new shell, so if you change the working directory on one line, it won't have an effect on later lines: