add --jq option to run a json query against Jira service response json

vendor/github.com/savaki/jq/scanner/find_key.go

@@ -0,0 +1,86 @@
+// Copyright (c) 2016 Matt Ho <matt.ho@gmail.com>
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package scanner
+
+import "bytes"
+
+// FindKey accepts a JSON object and returns the value associated with the key specified
+func FindKey(in []byte, pos int, k []byte) ([]byte, error) {
+	pos, err := skipSpace(in, pos)
+	if err != nil {
+		return nil, err
+	}
+
+	if v := in[pos]; v != '{' {
+		return nil, newError(pos, v)
+	}
+	pos++
+
+	for {
+		pos, err = skipSpace(in, pos)
+		if err != nil {
+			return nil, err
+		}
+
+		keyStart := pos
+		// key
+		pos, err = String(in, pos)
+		if err != nil {
+			return nil, err
+		}
+		key := in[keyStart+1 : pos-1]
+		match := bytes.Equal(k, key)
+
+		// leading spaces
+		pos, err = skipSpace(in, pos)
+		if err != nil {
+			return nil, err
+		}
+
+		// colon
+		pos, err = expect(in, pos, ':')
+		if err != nil {
+			return nil, err
+		}
+
+		pos, err = skipSpace(in, pos)
+		if err != nil {
+			return nil, err
+		}
+
+		valueStart := pos
+		// data
+		pos, err = Any(in, pos)
+		if err != nil {
+			return nil, err
+		}
+
+		if match {
+			return in[valueStart:pos], nil
+		}
+
+		pos, err = skipSpace(in, pos)
+		if err != nil {
+			return nil, err
+		}
+
+		switch in[pos] {
+		case ',':
+			pos++
+		case '}':
+			return nil, errKeyNotFound
+		}
+	}
+}