git ssb

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#!/nix/var/nix/profiles/execline/bin/execlineb -W
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# Execute things in an ephemeral nix environment context, with similar
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# syntax as `guix environment --ad-hoc`:
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# nix-environment <package_1> [ ... <package_n> ] -- \
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#   command [ <arg_1> [ ... <arg_n>]]
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/nix/var/nix/profiles/execline/bin/define EL_BIN /nix/var/nix/profiles/execline/bin
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${EL_BIN}/import PATH
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${EL_BIN}/export PATH ${EL_BIN}:$PATH
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${EL_BIN}/importas -i PACKAGE 1
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ifelse {
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  redirfd -w 1 /dev/null
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  expr -- $PACKAGE != --
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}
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{
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  ifelse {
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    redirfd -w 1 /dev/null
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    import \#
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    expr $\# = 0
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  }
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  {
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    fdmove 1 2
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    echo "The '--' argument is required"
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    exit 1
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  }
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  backtick PACKAGE_NETSTRING {
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    execlineb -c "dollarat -d \"\"" $PACKAGE
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  }
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  multisubstitute {
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    import PACKAGE_NETSTRING
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    import -D "" NIX_ENVIRONMENT_PACKAGES
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  }
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  export NIX_ENVIRONMENT_PACKAGES ${NIX_ENVIRONMENT_PACKAGES}${PACKAGE_NETSTRING}
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  importas -i SELF 0
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  shift
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  elgetpositionals
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  emptyenv -P
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  export PATH $PATH
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  ${EL_BIN}/execlineb $SELF $@
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}
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shift
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import -u -s -d "" NIX_ENVIRONMENT_PACKAGES
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export PATH $PATH
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nix-shell -p $NIX_ENVIRONMENT_PACKAGES --run
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  "exec '${EL_BIN}/elgetpositionals' \\$@"