From 41c0c35805ec1708729f73d14650d8ebc94a405b Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Wed, 29 Jun 2016 13:46:52 +0200
Subject: enable listing of arbitrary attrsets when using -l

---
 get | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/get b/get
index 2ed2fe6..d452d9a 100755
--- a/get
+++ b/get
@@ -13,7 +13,8 @@
 #
 #   -j    Format output as JSON. Implies -s.
 #
-#   -l    List attrNames, one per line.
+#   -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.)
 #
@@ -55,9 +56,13 @@ if has_sopt j; then
 fi
 
 if has_sopt l; then
-  unset json
-  unset strict
-  filter() { sed 's/\({ \)\?\(\S\+\) = <CODE>; }\?/\2\n/g' | grep .; }
+  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
@@ -83,6 +88,9 @@ if x=$(nix-instantiate --json --eval -A NIX_PATH 2>/dev/null); then
   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} \
   ${show_trace+--show-trace} \
@@ -92,7 +100,7 @@ result=$(nix-instantiate \
     for i; do
       echo "$i"
     done | sed -n '
-      s/^[A-Za-z_][0-9A-Za-z_"./-]*$/--attr &/p
+      s/^[A-Za-z_][0-9A-Za-z_"./-]*$/'"$query"'/p
       s/^\([0-9A-Za-z-]\+\)=\([.0-9A-Za-z-]*\)$/--argstr \1 \2/p
     '
   ) \
-- 
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