From a39d54aa2e28d8b15a5879024f64f3f41dee9f3b Mon Sep 17 00:00:00 2001
From: tv <tv@shackspace.de>
Date: Fri, 25 Sep 2015 22:50:03 +0200
Subject: initial commit

---
 get | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100755 get

diff --git a/get b/get
new file mode 100755
index 0000000..2db2822
--- /dev/null
+++ b/get
@@ -0,0 +1,91 @@
+#! /bin/sh
+#
+# NAME
+#   get - evaluate ./default.nix
+#
+# SYNOPSIS
+#   get [-jlprs] [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.
+#
+#   -p    Pretty-print output. (Only effectiv in conjunction with -j.)
+#
+#   -r    If result looks is a string, then it will be written directly to
+#         standard output rather than being formatted as JSON or Nix string
+#         with quotes. Refs jq(1)'s --raw-output.
+#
+#   -s    Recursively evaluate list elements and attributes.
+#         Refs nix-instantiate(1)'s --strict.
+#
+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() { cat; }
+
+if has_sopt j; then
+  json=1
+  strict=1
+fi
+
+if has_sopt l; then
+  unset json
+  unset strict
+  filter() { sed 's/\({ \)\?\(\S\+\) = <CODE>; }\?/\2\n/g' | grep .; }
+fi
+
+if has_sopt p && has_sopt j; then
+  filter() { jq .; }
+fi
+
+if has_sopt r; then
+  raw_output=1
+fi
+
+if has_sopt s; then
+  strict=1
+fi
+
+
+if x=$(nix-instantiate --json --eval -A NIX_PATH 2>/dev/null); then
+  NIX_PATH=$(echo "$x" | jq -r .)
+  export NIX_PATH
+  unset x
+fi
+
+result=$(nix-instantiate \
+  --eval \
+  --argstr user-name "$LOGNAME" \
+  ${json+--json} \
+  ${strict+--strict} \
+  $(
+    for i; do
+      echo "$i"
+    done | sed -n '
+      s/^[A-Za-z_][0-9A-Za-z_.-]*$/--attr &/p
+      s/^\([0-9A-Za-z-]\+\)=\([0-9A-Za-z-]*\)$/--argstr \1-name \2/p
+    '
+  ))
+
+case ${raw_output-0} in 1)
+  case ${result:0:1} in \")
+    result=$(echo "$result" | jq -e -r .)
+  esac
+esac
+
+echo "$result" | filter
-- 
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