add in-built logging support for a better dev experience

vendor/github.com/aybabtme/humanlog/docker_compose_handler.go

@@ -0,0 +1,29 @@
+package humanlog
+
+import (
+	"regexp"
+)
+
+// dcLogsPrefixRe parses out a prefix like 'web_1 | ' from docker-compose
+// The regex exists of five parts:
+// 1. An optional color terminal escape sequence
+// 2. The name of the service
+// 3. Any number of spaces, and a pipe symbol
+// 4. An optional color reset escape sequence
+// 5. The rest of the line
+var dcLogsPrefixRe = regexp.MustCompile("^(?:\x1b\\[\\d+m)?(?P<service_name>[a-zA-Z0-9._-]+)\\s+\\|(?:\x1b\\[0m)? (?P<rest_of_line>.*)$")
+
+type handler interface {
+	TryHandle([]byte) bool
+	setField(key, val []byte)
+}
+
+func tryDockerComposePrefix(d []byte, nextHandler handler) bool {
+	if matches := dcLogsPrefixRe.FindSubmatch(d); matches != nil {
+		if nextHandler.TryHandle(matches[2]) {
+			nextHandler.setField([]byte(`service`), matches[1])
+			return true
+		}
+	}
+	return false
+}