Shebang flakes #1
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Enables shebang usage of nix shell. All arguments with `#! nix` get
added to the nix invocation. This implementation does NOT set any
additional arguments other than placing the script path itself as the
first argument such that the interpreter can utilize it.
Example below:
```
#!/usr/bin/env nix
#! nix shell --quiet
#! nix nixpkgs#bash
#! nix nixpkgs#shellcheck
#! nix nixpkgs#hello
#! nix --ignore-environment --command bash
# shellcheck shell=bash
set -eu
shellcheck "$0" || exit 1
function main {
hello
echo 0:"$0" 1:"$1" 2:"$2"
}
"$@"
```
fix: include programName usage
fix: release notes
This will allow a different base directory to be used, matching a shebang script location instead of the working directory.
Being restrictive about syntax leaves opportunity to improve the syntax and functionality later.
These usages of the working directory are perhaps unlikely to interact with shebangs, but the code is more consistent this way, and we're less likely to miss usages that do interact.
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Motivation
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Also did a rebase ,making this a bit weird.