When assigning an a value to NIX_GET_COMPLETIONS that could not be
parsed as an integer lix would just crash, as the value was directly
passed to stoi, without handling the return value.
This change switches the parsing to use string2Int and throws an
exception if the return value is empty.
The behaviour of lix is slightly changed through, as the value of the
variable was previously parsed to an int and then assigned to a variable
of size_t.
This change in behaviour can only be observed in cases where the
value of NIX_GET_COMPLETIONS is chosen so when it overflows it would
be valid index of the provided arguments again.
Through this change the variable is parsed as a size_t and negative
values are rejected.
Change-Id: Idf7c5740274c6e07d5bb13d7e2ed32764bfc27f8
When using completion, the number of the word for which the shell
requests completion is provided in the environment variable
`NIX_GET_COMPLETIONS`. When the number smaller than 1 is or larger
than the number of arguments nix coredumps as a assert is violated.
This change removes the assert and instead throws an exception informing
the user that their autocomplete is most likely misconfigured.
Change-Id: I821719e470e576b6f63c06beb097338b53d183e0
Improve tests and docs prior to refactoring completions
(cherry picked from commit 5442d9b47298389918d1f38d20f768a80ffc2369)
Change-Id: Ief99ac2cd9c92981a9a522d15b9c3daf99182c9d
I think it is bad for these reasons when `tests/` contains a mix of
functional and integration tests
- Concepts is harder to understand, the documentation makes a good
unit vs functional vs integration distinction, but when the
integration tests are just two subdirs within `tests/` this is not
clear.
- Source filtering in the `flake.nix` is more complex. We need to
filter out some of the dirs from `tests/`, rather than simply pick
the dirs we want and take all of them. This is a good sign the
structure of what we are trying to do is not matching the structure
of the files.
With this change we have a clean:
```shell-session
$ git show 'HEAD:tests'
tree HEAD:tests
functional/
installer/
nixos/
```
(cherry picked from commit 68c81c737571794f7246db53fb4774e94fcf4b7e)
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