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|
#! /bin/sh
#
# NAME
# get - evaluate ./default.nix
#
# SYNOPSIS
# get [-jlprs] [--show-trace] [attrPath]
#
# DESCRIPTION
# The command nix evaluates the Nix expression in ./default.nix.
#
# OPTIONS
#
# -j Format output as JSON. Implies -s.
#
# -l List attrNames, one per line. If used in conjunction with -j, then
# the list will be output as JSON value.
#
# -p Pretty-print output. (Only effectiv in conjunction with -j.)
#
# -r Disable the default filter and produce raw output. Normally, when
# the result looks like a JSON or Nix string, i.e. begins with a double
# quote, then the string itself gets printed.
# Refs jq(1)'s --raw-output.
#
# -s Recursively evaluate list elements and attributes.
# Refs nix-instantiate(1)'s --strict.
#
# --show-trace
# Refs nix-instantiate(1)'s --show-trace.
#
set -efu
args=$*
has_lopt() {
echo "$args" | grep -q '\(^\|\s\)--'"$1"'\(\s\|$\)'
}
has_sopt() {
echo "$args" | grep -q '\(^\|\s\)-[a-z]*'"$1"'[a-z]*\(\s\|$\)'
}
filter() {
set -- "$(cat)"
if echo "$1" | grep -q ^\"; then
echo "$1" | jq -e -r .
else
echo "$1"
fi
}
if has_sopt j; then
json=1
strict=1
fi
if has_sopt l; then
query='-E builtins.attrNames((import(./.)).&)'
if ! has_sopt j; then
json=1
filter() { jq -r .[]; }
fi
else
query='-A &'
fi
if has_sopt p && has_sopt j; then
filter() { jq .; }
fi
if has_sopt r; then
filter() { cat; }
fi
if has_sopt s; then
strict=1
fi
if has_lopt show-trace; then
show_trace=1
fi
if x=$(nix-instantiate --json --eval -A NIX_PATH 2>/dev/null); then
NIX_PATH=$(echo "$x" | jq -r .)
export NIX_PATH
unset x
fi
# Quote slashes so we can use query as replacement string for sed's s///.
query=$(echo "$query" | sed 's:/:\\&:')
result=$(nix-instantiate \
${json+--json} \
${show_trace+--show-trace} \
${strict+--strict} \
--eval \
$(
for i; do
echo "$i"
done | sed -n '
s/^[A-Za-z_][0-9A-Za-z_"./-]*$/'"$query"'/p
s/^\([0-9A-Za-z-]\+\)=\([.0-9A-Za-z-]*\)$/--argstr \1 \2/p
'
) \
--argstr current-date "$(date -Is)" \
--argstr current-host-name "$HOSTNAME" \
--argstr current-user-name "$LOGNAME" \
)
echo "$result" | filter
|
