From 130152a2ac042ca5633c9311822768ed0dfaefe4 Mon Sep 17 00:00:00 2001
From: Muh Muhten <muh.muhten@gmail.com>
Date: Thu, 21 Feb 2019 04:11:41 -0500
Subject: [PATCH] Ensure limit(0; ...) is empty

---
 src/builtin.jq | 6 +++---
 tests/jq.test  | 8 ++++++++
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/builtin.jq b/src/builtin.jq
index d5fa9b999e..d3a4bb16d1 100644
--- a/src/builtin.jq
+++ b/src/builtin.jq
@@ -168,9 +168,9 @@ def until(cond; next):
          if cond then . else (next|_until) end;
      _until;
 def limit($n; exp):
-  if $n < 0 then exp
-  else label $out | foreach exp as $item ($n; .-1; $item, if . <= 0 then break $out else empty end)
-  end;
+    if $n > 0 then label $out | foreach exp as $item ($n; .-1; $item, if . <= 0 then break $out else empty end)
+    elif $n == 0 then empty
+    else exp end;
 def isempty(g): 0 == ((label $go | g | (1, break $go)) // 0);
 def first(g): label $out | g | ., break $out;
 def last(g): reduce g as $item (null; $item);
diff --git a/tests/jq.test b/tests/jq.test
index c027f5382a..f330fb0f6d 100644
--- a/tests/jq.test
+++ b/tests/jq.test
@@ -304,6 +304,14 @@ null
 [11,22,33,44,55,66,77,88,99]
 [11,22,33]
 
+[limit(0; error)]
+"badness"
+[]
+
+[limit(1; 1, error)]
+"badness"
+[1]
+
 [first(range(.)), last(range(.)), nth(0; range(.)), nth(5; range(.)), try nth(-1; range(.)) catch .]
 10
 [0,9,0,5,"nth doesn't support negative indices"]