Print offending object in runtime error messages

When reporting an error to the user, add information about the offending
object/value (possibly truncated).

The goal is to give a user some context regarding which input object
caused the runtime error.

Examples:

    $ echo '"hello"' | ./jq '-.'
    jq: error: string ("hello") cannot be negated

    $ echo '"very-long-string"' | ./jq '-.'
    jq: error: string ("very-long-...) cannot be negated

    $ echo '["1",2]' | ./jq '.|join(",")'
    jq: error: string (",") and number (2) cannot be added

    $ echo '["1","2",{"a":{"b":{"c":33}}}]' | ./jq '.|join(",")'
    jq: error: string (",") and object ({"a":{"b":{...) cannot be added

    $ echo '{"a":{"b":{"c":33}}}' | ./jq '.a | @tsv'
    jq: error: object ({"b":{"c":33}}) cannot be tsv-formatted, only array

(Fix #754)

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/all.test b/tests/all.test
index 106afaa4..950801ab 100644
--- a/tests/all.test
+++ b/tests/all.test
@@ -1173,3 +1173,15 @@ import "test_bind_order" as check; check::check
 null
 true
 
+try -. catch .
+"very-long-string"
+"string (\"very-long-...) cannot be negated"
+
+try join(",") catch .
+["1",2]
+"string (\",\") and number (2) cannot be added"
+
+try join(",") catch .
+["1","2",{"a":{"b":{"c":33}}}]
+"string (\",\") and object ({\"a\":{\"b\":{...) cannot be added"
+